JP2018194228A - Floor heating system - Google Patents

Abstract

To provide a floor heating system capable of improving room temperature adjustment performance and reducing energy consumption. A cycle time of a floor heating system 2 is set within a range of 30 minutes or more and 60 minutes or less, and a thermal valve 24 installed in a circulation circuit 22 connecting a heat source device 23 and a floor heating panel 21 is turned on. By performing duty control on the time, hot water is intermittently supplied from the heat source unit 23 to the floor heating panel 21. Then, when 20 minutes have passed since the start of the cycle time and the temperature deviation obtained by subtracting the set time from the room temperature is −1.0 ° C. or less, the cycle time and the duty ratio are reset, and the duty cycle is reset. Redo control. [Selection] Figure 3

Description

  The present invention relates to a floor heating system, and more particularly to a floor heating system that warms a floor surface by circulating hot water between a heat source device and a floor heating device.

  Conventionally, a floor heating system is known as a heating system that warms up from the feet. The floor heating system, for example, intermittently supplies hot water heated to a predetermined required temperature by a heat source machine between a heat source machine and a floor heating device by opening and closing a thermal valve within a cycle time set to a predetermined time. Circulate and warm the floor. In the conventional floor heating system, the cycle time is set to 20 minutes.

JP 2013-234787 A

  In the conventional floor heating system, the cycle time is set to 20 minutes on the basis of a house having low airtightness and heat insulation. In recent years, a house has become airtight and highly insulated, and when a conventional floor heating system is applied to such a house, the room temperature may be higher than the set temperature when 20 minutes, which is one cycle, has elapsed. Even in this case, in the conventional floor heating system, since the next cycle arrives, the thermal valve is opened to raise the room temperature. Therefore, in the conventional floor heating system, the room temperature is maintained higher than the set temperature, and energy may be used more than necessary.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a floor heating system that can improve room temperature adjustment performance and reduce energy consumption.

  The floor heating system according to one aspect of the present invention includes a heat source device that heats hot water, a floor heating device that warms a floor surface by flowing hot water, the heat source device and the floor heating device, and the heat source device A circulation circuit that circulates hot water between the floor heating device, an opening and closing device that opens and closes the circulation circuit, and a control device that performs duty control of the opening and closing device in a cycle time of 30 minutes to 60 minutes. It is characterized by having. In this specification, duty control refers to a method for controlling opening and closing of the switchgear, and more specifically, for each cycle time, a duty ratio indicating a ratio of the time for opening the switchgear to the cycle time is set. Controlling the opening and closing of the switchgear according to the set duty ratio.

  When the cycle time is set to 20 minutes for the floor heating system used in a house having high airtightness and high heat insulation, the present inventors open the switchgear before the room temperature falls below the set temperature, Noticed the problem of being maintained higher than necessary. Therefore, the present inventors have performed simulations and found that it is preferable to set the cycle time of duty control in the floor heating system within a range of 30 minutes to 60 minutes.

  In the above configuration, the duty ratio for opening the switchgear is not set when 20 minutes have elapsed since the start of the cycle time of a certain cycle. Therefore, even if the floor heating system is used in a house having high airtightness and high heat insulation, for example, in a state where the room temperature exceeds the set temperature when 20 minutes have elapsed since the start of the cycle time, the switchgear It is possible to avoid circulating hot water heated by the heat source machine between the heat source machine and the floor heating device. Therefore, according to the said floor heating system, room temperature can be prevented from being maintained exceeding preset temperature, and room temperature adjustment performance can be improved. And a floor heating system can suppress heating the air of a room using useless energy, and can reduce energy consumption.

  Further, the floor heating system having the above configuration includes a room temperature detection unit that detects a room temperature of a room in which the floor heating device is installed, a setting unit that sets a set temperature of the room, and a set temperature that is set by the setting unit. The control device is configured to determine whether a temperature deviation obtained by subtracting the set temperature stored in the storage unit from the room temperature detected by the room temperature detection unit is equal to or less than a predetermined value. A determination process for determining whether or not the temperature deviation is determined to be equal to or less than a predetermined value in the determination process, resetting a cycle time when the determination is made, and restarting the duty control And, in the determination process, when it is determined that the temperature deviation is not equal to or less than a predetermined value, a continuation process for maintaining the cycle time when the determination is made and continuing the duty control is performed. Ukoto is preferable.

  The floor heating system configured as described above resets the cycle time within a cycle time of a certain cycle, for example, when a window is opened for ventilation during floor heating and the room temperature is lower than a set value by a predetermined value. Repeat the duty control to change the floor heating operation to raise the room temperature. Therefore, according to the floor heating system, the room temperature adjustment performance is good.

  A control method for realizing the functions of the system, a computer program, and a computer-readable storage medium storing the computer program are also novel and useful.

  Therefore, according to the said floor heating system, the room temperature adjustment performance can be improved and the floor heating system which can reduce energy consumption can be provided.

1 is a schematic configuration diagram of a floor heating system according to an embodiment of the present invention. It is an electric block diagram of a floor heating system. It is a flowchart which shows the control procedure by the floor heating remote control side of floor heating operation. It is a graph which shows the result of the simulation of an Example. It is a graph which shows the result of the simulation of the 1st comparative example. It is a graph which shows the result of the simulation of the 2nd comparative example. 6 is a graph comparing the room temperature of the example shown in FIG. 4, the room temperature of the first comparative example shown in FIG. 5, and the room temperature of the second comparative example shown in FIG. It is a graph for demonstrating room temperature change.

  Next, an embodiment of the floor heating system according to the present invention will be described with reference to the drawings. The floor heating system according to the present embodiment is applied to a house having high airtightness and high heat insulation with a Q value of 2.0 or less, for example. Here, the Q value is a heat loss coefficient and is a value that numerically represents the heat insulation performance of a house. It means that airtightness and heat insulation are so high that Q value is small.

[Schematic configuration of floor heating system]
First, a schematic configuration of the floor heating system 2 will be described. FIG. 1 is a schematic configuration diagram of a floor heating system 2. The floor heating system 2 includes a floor heating panel 21, a circulation circuit 22, a heat source device 23, a thermal valve 24, and a floor heating remote controller 25. The floor heating panel 21 is an example of a floor heating device. The thermal valve 24 is an example of an opening / closing device. The floor heating remote controller 25 is attached to the wall of the room where the floor heating panel 21 is installed, and incorporates a room temperature sensor 255. The room temperature sensor 255 is an example of a room temperature detector.

  The floor heating panel 21 is arranged with meandering pipes (not shown) through which hot water flows. The floor heating panel 21 may be installed on the lower side of the floor surface 9 or may be provided integrally with a floor material constituting the floor surface 9.

  The circulation circuit 22 includes a forward pipe 22a and a return pipe 22b, and a thermal valve 24 is disposed in the forward pipe 22a. The forward piping 22 a connects an end portion of a pipe (not shown) of the floor heating panel 21 and the heat source unit 23, and supplies hot water from the heat source unit 23 to the floor heating panel 21. The return pipe 22 b connects an outlet side end of a pipe (not shown) of the floor heating panel 21 and the heat source unit 23, and discharges the hot water radiated by the floor heating panel 21 from the floor heating panel 21 to the heat source unit 23. The thermal valve 24 includes a valve portion and a drive portion. The drive portion of the thermal valve 24 causes the valve portion to perform a valve opening operation when electric power is supplied, while causing the valve portion to perform a valve closing operation when the electric power is interrupted.

  The heat source machine 23 has a known configuration. Briefly, in the heat source machine 23, a burner 233 and a pump 234 are disposed in a passage (not shown) connected to the return pipe 22b and the forward pipe 22a. The burner 233 is connected to the gas supply source 3 and burns the gas to heat the hot water. The pump 234 is supplied with electric power from the electric power supply source 4 and sends hot water from a return pipe 22b side to an outgoing pipe 22a side through a passage (not shown). The heat source unit 23 incorporates a control board 231 for controlling the floor heating system 2. Further, the heat source device 23 includes a tank 235 that stores hot water heated by the burner 233. The tank 235 is provided with a hot water temperature detection sensor 236 for detecting the temperature of the hot water.

[Electric configuration of floor heating system]
Next, the electrical configuration of the floor heating system 2 will be described. FIG. 2 is an electric block diagram of the floor heating system 2.

  In the floor heating remote controller 25, an input unit 256, a display unit 257, a room temperature sensor 255, and a communication unit 258 are connected to the controller 250. The input unit 256 is an example of a setting unit. The input unit 256 includes a group of buttons that are input and operated by the user, such as an operation button for turning on or off the floor heating operation and a temperature setting button for setting a set temperature. The display unit 257 is a liquid crystal panel that displays information such as setting memory and time. The room temperature sensor 255 is hardware that detects the room temperature. The communication unit 258 is hardware to which communication wiring is connected.

  The controller 250 is connected to the control board 231 of the heat source device 23 via the communication unit 258 and transmits / receives data to / from the control board 231.

  The controller 250 includes a CPU 251, a ROM 252, a RAM 253, and a flash memory 254. The flash memory 254 is an example of a storage unit. The CPU 251 executes programs stored in the ROM 252 and the flash memory 254 while storing data in the RAM 253 and the flash memory 254.

  In the flash memory 254, for example, a set temperature input by the user operating the input unit 256 is stored. The flash memory 254 stores a floor heating operation program 2541 and a duty ratio setting table 2542. The floor heating operation program 2541 is a program for controlling floor heating by the floor heating system 2. The duty ratio setting table 2542 stores the required temperature and the duty ratio in association with the temperature deviation between the room temperature and the set temperature. The required temperature refers to the temperature of hot water produced by the heat source device 23, that is, the set temperature of hot water supplied to the floor heating panel 21. The required temperature is set, for example, within a range of 40 ° C. to 75 ° C., and the required temperature is set higher as the temperature deviation is larger. The duty ratio refers to the ratio of the time for opening the thermal valve 24 (hereinafter referred to as “ON time”) to the cycle time. That is, the duty ratio is a value obtained by dividing the ON time by the cycle time [ON time and time for closing the thermal valve 24 (hereinafter referred to as “OFF time”)]. The duty ratio is set such that the duty ratio of the ON time is increased (ON time is longer) as the temperature deviation is larger.

  The control board 231 of the heat source device 23 is a known microcomputer. The control board 231 includes a communication unit 2311, a CPU 2312, a ROM 2313, a RAM 2314, and a flash memory 2315. The communication unit 2311 is hardware to which communication wiring is connected. The CPU 2312 is connected to the floor heating remote controller 25 via the communication unit 2311 and transmits / receives data to / from the floor heating remote controller 25. Further, the CPU 2312 is connected to the thermal valve 24 via the communication unit 2311. The CPU 2312 opens the thermal valve 24 by supplying electric power to the thermal valve 24 via the communication unit 2311. Then, the CPU 2312 closes the thermal valve 24 by stopping power supply to the thermal valve 24 via the communication unit 2311. The CPU 2312 executes programs stored in the ROM 2313 and the flash memory 2315 while storing data in the RAM 2314 and the flash memory 2315. The flash memory 2315 stores a hot water control program 2316. The burner 233 and the pump 234 are connected to the control board 231 and the operation is controlled by the CPU 2312. The hot water temperature detection sensor 236 is connected to the control board 231, detects the temperature of the hot water, and transmits it to the control board 231. The control board 231 and the controller 250 of the floor heating remote controller 25 constitute an example of a control device.

[Outline of floor heating operation]
Next, an outline of floor heating operation will be described. The floor heating system 2 starts a cycle time of 40 minutes when the operation button of the floor heating remote controller 25 is turned on. Further, the floor heating system 2 sets the duty ratio based on the temperature deviation between the room temperature and the set temperature. Then, the floor heating remote controller 25 sets the required temperature based on the temperature deviation, and transmits the required temperature and the duty ratio to the heat source unit 23. When the hot water is heated above the required temperature, the heat source unit 23 opens and closes the thermal valve 24 according to the duty ratio received from the floor heating remote controller 25. When the floor heating remote controller 25 detects that the cycle time (40 minutes) has elapsed, it resets the duty ratio of the cycle and resets the required temperature and duty ratio for the next cycle.

  In the floor heating system 2, when the heat source unit 23 opens the thermal valve 24, hot water having a required temperature circulates between the heat source unit 23 and the floor heating panel 21. During this time, the heat radiation amount of the floor heating panel 21 increases. On the other hand, in the floor heating system 2, when the heat source device 23 closes the thermal valve 24, the hot water does not circulate between the heat source device 23 and the floor heating panel 21. During this time, the amount of heat released from the floor heating panel 21 is reduced.

  In such a floor heating system 2, when the temperature deviation between the room temperature measured by the room temperature sensor 255 and the set temperature set in the floor heating remote controller 25 is large, the duty ratio of the ON time is set large. The temperature of the floor surface 9 is raised. That is, the increase in room temperature is promoted.

  On the other hand, when the temperature deviation between the room temperature measured by the room temperature sensor 255 and the set temperature set in the floor heating remote controller 25 is small, the floor heating system 2 sets the duty ratio of the ON time to be small. Thus, the temperature rise of the floor surface 9 is suppressed. That is, an increase in room temperature is suppressed.

  Therefore, the floor heating system 2 sets the duty ratio based on the temperature deviation for each cycle time during the floor heating operation, and controls the opening / closing operation of the thermal valve 24 to set the room temperature to the set temperature. It is possible to adjust to.

  Here, in the floor heating system 2, the cycle time for duty-controlling the thermal valve 24 is set to 40 minutes, which is longer than the conventional 20 minutes. Therefore, for example, when the floor heating system 2 is installed in a house that has high airtightness and high heat insulation with a Q value of 2.0 or less and the room temperature does not easily drop, the duty ratio is set so that the room temperature exceeds the set temperature. Opening the thermal valve 24 again by setting is avoided. That is, the duty control of the thermal valve 24 is continued for 40 minutes. Therefore, the floor heating system 2 is prevented from having a room temperature higher than necessary than the set temperature.

  Further, the floor heating system 2 determines whether a temperature deviation, which is a value obtained by subtracting the set temperature from the room temperature, is equal to or less than a predetermined value in the middle of the cycle time of 40 minutes. When the temperature deviation is equal to or smaller than the predetermined value, the floor heating system 2 resets the cycle, reviews the duty ratio, and performs duty control of the thermal valve 24 again. On the other hand, if the temperature deviation is not less than the predetermined value, the duty ratio of the cycle is maintained and the duty control of the thermal valve 24 is continued as it is. Thus, even if the cycle time is lengthened, the floor heating system 2 maintains the duty ratio based on the temperature deviation in the middle of the cycle time and continues the duty control, or reviews the duty ratio and restarts the duty control. Determine whether. Therefore, for example, even if the room temperature drops due to opening a window in a room heated by floor heating, the floor heating operation is changed so that the room temperature is raised during the cycle time of 40 minutes. Can do. Therefore, the floor heating system 2 has good room temperature adjustment performance.

[Control procedure for floor heating operation]
Subsequently, the control procedure of the floor heating operation will be described with reference to FIG.

  The floor heating remote controller 25 reads the floor heating operation program 2541 from the flash memory 254 when the operation button included in the input unit 256 is turned on, and executes the control shown in the flowchart of FIG. The operation button is turned on when the user manually operates. In addition, when the user operates the input unit 256 and sets the operation start time for starting floor heating, the operation button is automatically set when the controller 250 detects that the operation start time has been reached. Turned on.

  When the control button is turned on, the CPU 251 transmits an operation start signal to the heat source unit 23 (step 1, hereinafter referred to as “S1”). This is to give the heat source machine 23 an opportunity to execute the hot water control program 2316.

  Then, the CPU 251 starts measuring the cycle time using a built-in timer, and starts the cycle time (S2). Then, the CPU 251 calculates a temperature deviation between the room temperature and the set temperature (S3). That is, the CPU 251 receives the room temperature detected by the room temperature sensor 255 from the room temperature sensor 255 and acquires it. The flash memory 254 stores, for example, a set temperature set by operating a temperature setting button of the input unit 256. The CPU 251 reads and acquires the set temperature from the flash memory 254. The CPU 251 calculates a temperature deviation by subtracting the set temperature from the room temperature thus acquired.

  Then, the CPU 251 acquires the required temperature and the duty ratio based on the temperature deviation calculated in S2 (S4). That is, the CPU 251 collates the temperature deviation calculated in S2 with the duty ratio setting table 2542 stored in the flash memory 254, and reads the required temperature and the duty ratio corresponding to the temperature deviation from the duty ratio setting table 2542. To be stored in the RAM 253.

  Thereafter, the CPU 251 transmits the required temperature and the duty ratio acquired in S3 to the control board 231 of the heat source machine 23 via the communication unit 258 (S5). When the temperature of the hot water detected by the hot water temperature detection sensor 236 is not equal to or higher than the required temperature received from the floor heating remote controller 25, the CPU 2312 of the control board 231 burns the burner 233 with the thermal valve 24 closed. And warm water is heated above the required temperature. When the temperature of the hot water is equal to or higher than the required temperature, the CPU 2312 opens and closes the thermal valve 24 according to the duty ratio received from the floor heating remote controller 25.

  Then, the CPU 251 determines whether or not to stop the floor heating operation (S6). When the user manually operates the operation button of the input unit 256 and turns off, or when the operation end time is set in advance and the operation button of the input unit 256 is automatically turned off, the CPU 251 Judge that the operation will be stopped. When the CPU 251 determines to stop the floor heating operation (S6: YES), the CPU 251 transmits an operation stop signal indicating that the floor heating operation is stopped to the control board 231 of the heat source unit 23 (S14). When receiving the operation stop signal, the control board 231 stops producing hot water. In addition, the control board 231 brings the thermal valve 24 into a valve closed state. Thereafter, the CPU 251 ends the control of the floor heating operation.

  When it is determined that the floor heating operation is not stopped (S6: NO), the CPU 251 determines whether or not 20 minutes have elapsed since the start of the cycle time in S1 via a built-in timer. (S7).

  When 20 minutes have not elapsed (S7: NO), the CPU 251 returns to S6. That is, the CPU 251 maintains the duty ratio transmitted to the heat source unit 23 in S5 until 20 minutes have elapsed, and continues the duty control.

  On the other hand, when 20 minutes have elapsed since the start of the cycle time (S7: YES), the CPU 251 acquires the room temperature and the set temperature (S8). That is, the CPU 251 receives the room temperature detected by the room temperature sensor 255 from the room temperature sensor 255 and stores it in the RAM 253. Further, the CPU 251 reads the set temperature stored in the flash memory 254 from the flash memory 254 and stores it in the RAM 253.

  Then, the CPU 251 calculates a temperature deviation by subtracting the set temperature from the room temperature stored in the RAM 253 in S8 (S9). Thereafter, the CPU 251 determines whether the temperature deviation calculated in S9 is −1.0 ° C. or less (S10). Note that the process of S10 is an example of a determination process. Moreover, -1.0 degreeC is an example of a predetermined value.

  When the CPU 251 determines that the temperature deviation calculated in S9 is not −1.0 ° C. or less (S10: NO), the CPU 251 determines whether to stop the floor heating operation (S11). That is, when the room temperature is not lower than the set temperature by 1 ° C. or more, the CPU 251 maintains the duty ratio transmitted to the heat source unit 23 in S5 and continues the duty control.

  When the CPU 251 determines to stop the floor heating operation (S11: YES), the CPU 251 ends the control of the floor heating operation after performing the process of S14. Since the process of S11 is the same as the process of S6, description is omitted.

  On the other hand, if the CPU 251 determines that the floor heating operation is not stopped (S11: NO), the CPU 251 determines whether or not 40 minutes have elapsed since the start of the cycle time in S1 via a built-in timer. (S12). That is, the CPU 251 monitors the end of the cycle.

  The CPU 251 returns to S11 until 40 minutes have elapsed (S12: NO). That is, the CPU 251 waits until 40 minutes have elapsed while maintaining the duty ratio transmitted to the heat source device 23 in S5. Note that the processing of S10: NO and S12: NO is an example of continuation processing.

  When the CPU 251 determines that 40 minutes have passed (S12: YES), it initializes a built-in timer and resets the cycle time (S13). Thereafter, the CPU 251 returns to S2 and starts the next cycle. That is, the CPU 251 calculates the temperature deviation immediately after or after the cycle time, and reacquires the required temperature and the duty ratio based on the temperature deviation. Thereby, for example, when the floor heating system 2 is applied to a house having a high airtightness and high heat insulation with a Q value of 2.0 or less, and the room temperature of the room heated by the floor heating is difficult to decrease, the conventional floor heating system Since the duty ratio is set with a cycle time of 40 minutes that is longer than the cycle time (20 minutes), it can be avoided that the room temperature is maintained higher than necessary. Further, it is possible to avoid the burner 233 from burning gas in vain and to reduce the amount of energy consumption.

  On the other hand, when 20 minutes have elapsed since the start of the cycle time (S7: YES), the CPU 251 has a temperature deviation calculated by subtracting the set temperature from the room temperature being −1.0 ° C. or less. In some cases (S8, S9, S10: YES), the cycle time is reset in S13, and then the process returns to S2. That is, for example, when the room air is heated to the set temperature of 20 ° C. by the floor heating system 2, but the room temperature is lowered from 20 ° C. to 18 ° C. because the window is opened and ventilated, the duty ratio is increased even during the cycle time. The floor heating operation can be switched to an operation that raises the room temperature. Note that the processes of S10: YES and S13 are an example of a reset process.

[simulation]
Then, the simulation which investigates the performance of the floor heating system 2 is demonstrated. The inventors conducted a simulation to examine the performance when the cycle time was set to 20 minutes, the performance when the cycle time was set to 40 minutes, and the performance when the cycle time was set to 60 minutes.

  The hardware configuration used for each simulation is the same. That is, a floor heating panel was installed in a residential room corresponding to a Q value of 1.5. The room is a 16-tatami Western-style room. About 11 tatami floor heating panels were installed under the floor of the room. And the circulation circuit which connects a floor heating panel and a heat source machine was comprised with the pipe of internal diameter 10mm. The total length of the pipe from the heat source machine to the floor heating panel is 5 m.

  During the test, the room opening was fully closed. The room temperature at the beginning of the test was about 13 ° C., and the temperature of the floor surface was about 13 ° C., respectively. The set temperature was 20 ° C. In the test, hot water heated to a predetermined required temperature was circulated between the heat source unit and the floor heating panel at a flow rate of 4.0 L / min.

  An example in which the cycle time is set to 40 minutes and the thermal valve is duty-controlled, a first comparative example in which the cycle time is set to 20 minutes and the thermal valve is duty-controlled, and the cycle time is set to 60 minutes For the second comparative example that was set and duty controlled for the thermal valve, the bed temperature, room temperature, input gas heat quantity, and output (hereinafter referred to as “hot water heat quantity”) were examined. The floor temperature is the temperature of the floor surface measured by a thermometer installed on the floor. Room temperature is a temperature measured by a thermometer installed indoors. Input gas calorie | heat amount is the usage-amount of the gas used by a heat-source machine. The amount of hot water heat is the amount of heat supplied to the floor heating panel obtained by burning the gas with the heat source machine. FIG. 4 shows the simulation result of the example, FIG. 5 shows the simulation result of the first comparative example, and FIG. 6 shows the simulation result of the second comparative example. 4, 5, and 6, the horizontal axis indicates time [minute], and the left vertical axis indicates temperature [° C.] and heat quantity [kW]. 7 is a graph comparing the room temperature of the example shown in FIG. 4, the room temperature of the first comparative example shown in FIG. 5, and the room temperature of the second comparative example shown in FIG.

  When the room temperature is compared between the example and the first comparative example, as shown by X11 in FIG. 7, the first comparative example, at the time of start-up, after the room temperature has greatly increased the set temperature (20 ° C.), the room temperature has decreased. The steady operation is started. Further, in the first comparative example, during steady operation, the room temperature is maintained higher than the set temperature (20 ° C.) as indicated by X12. On the other hand, as shown by X1 in the figure, the embodiment starts steady operation when the room temperature rises to the set temperature (20 ° C.) during startup. In the embodiment, at the time of steady operation, the room temperature is substantially stabilized at the set temperature (20 ° C.) as indicated by X2 in the figure. Therefore, compared with the 1st comparative example, an Example has high room temperature adjustment performance which adjusts room temperature to preset temperature.

  Further, when the room temperature is compared between the example and the second comparative example, the variation in the room temperature with respect to the set temperature is smaller in the example than in the second comparative example. Therefore, compared with the 1st comparative example, an Example has high room temperature adjustment performance which adjusts room temperature to preset temperature.

  Consider these causes. FIG. 8 is a graph for explaining the room temperature change. A type 3 graph indicated by a thin solid line in the figure shows a change in room temperature when the cycle time D3 is set to 20 minutes for a house having a Q value of 4.0 having conventional heat insulation performance. A type 1 graph indicated by a solid line in the figure shows a change in room temperature when the cycle time D1 is set to 40 minutes for a house having a Q value of 1.5 having a heat insulation performance higher than that of a house having a conventional heat insulation performance. The type 2 graph indicated by the dotted line in the figure shows the change in room temperature when the cycle time D2 is set to 20 minutes for a house having a Q value of 1.5, which has a heat insulation performance higher than that of a house having a conventional heat insulation performance. The type 4 graph indicated by the alternate long and short dash line in the figure shows a change in room temperature when the cycle time D4 is set to 60 minutes for a house having a Q value of 1.5 having higher heat insulation performance than a house having conventional heat insulation performance. Each of the types 1 to 4 has an ON time (room temperature increase) and an OFF time (room temperature decrease) between the cycle times D1 to D4. Each of the graphs of types 1 to 4 shown in FIG.

  In the type 3 graph, after 20 minutes have elapsed after the room temperature has risen to the predetermined temperature T exceeding the set temperature, the room temperature is lowered to a temperature lower than the set temperature. This is because in a house having a Q value of 4.0, the air temperature in the room easily escapes to the outside of the room through a wall or a window. Therefore, it was suitable to set the cycle time to 20 minutes for a house having a Q value of 4.0 having conventional heat insulation performance.

  In the type 2 graph, the room temperature does not fall below the set temperature even after 20 minutes have elapsed after the room temperature has risen to the predetermined temperature T exceeding the set temperature. This is because a house with a Q value of 1.5 is less likely to transmit the temperature of the room air to the outside of the room through walls, windows, etc., compared to a house with a Q value of 4.0, and the room temperature is less likely to drop. Therefore, if floor heating is performed for a house with a Q value of 1.5 and 20 minutes applied to the Q value of 4.0 is set as the cycle time, the duty ratio is set before the room temperature falls below the set temperature. The thermal valve is opened. Therefore, the room temperature is maintained in a state exceeding the set temperature.

  On the other hand, in the type 1 graph, the room temperature does not fall below the set temperature even after 20 minutes have elapsed after the room temperature has risen to the predetermined temperature T exceeding the set temperature. However, the floor heating system in which the cycle time is set to 40 minutes does not reset the duty ratio and continues the duty control even after 20 minutes have elapsed from the start of the cycle time. Do not open more than necessary. Therefore, the room temperature continues to decrease. And when 40 minutes which are cycle time passes, room temperature will become less than preset temperature. In this state, the floor heating system starts the next cycle and opens the thermal valve. Therefore, the room temperature is stabilized near the set temperature.

  On the other hand, in the type 4 graph, the time during which the room temperature decreases (OFF time) becomes longer. Therefore, the room temperature when 60 minutes have elapsed since the start of the cycle time is lower than the room temperature when 40 minutes have elapsed since the start of the cycle time. And when the cycle time of 60 minutes passes, a thermal valve is opened and a floor surface is warmed. Therefore, at a Q value of 1.5, when the cycle time is set to 60 minutes, the variation in room temperature becomes larger than when the cycle time is set to 40 minutes.

  In addition, about the house of Q value 1.5, when cycle time is set to less than 30 minutes, the room temperature when cycle time passes will fall only to setting temperature vicinity. If the next cycle is started in this state, the room temperature may be maintained in a state higher than necessary than the set temperature as in the type 2 graph.

  Therefore, it was found that the cycle time should be set to 40 minutes when the floor heating system is used in a house having high airtightness and high heat insulation equivalent to a Q value of 1.5.

  Next, energy consumption is compared for the example, the first comparative example, and the second comparative example.

  As shown in FIG. 4, an Example burns gas with a gas burner and heats the hot water thermally radiated with the floor heating panel. Therefore, as shown by Y11 in the figure, the gas is used following the valve opening operation of the thermal valve, and as shown by Y12 in the figure, the gas is used following the valve closing operation of the thermal valve. It will not be done. That is, gas is also used intermittently in a 40 minute cycle. Similarly to this, as shown by Y21 and Y22 in FIG. 5, in the first comparative example, gas is intermittently used in a cycle of 20 minutes. Further, as indicated by Y31 and Y32 in FIG. 6, in the second comparative example, gas is intermittently used in a cycle of 60 minutes.

  In the example, as indicated by Y11 in FIG. 4, the number of times of gas supply per use at the time of gas use in the steady operation is about 7 to 9 times. On the other hand, in the first comparative example, as indicated by Y21 in FIG. 5, the number of times of gas supply per one time of gas use in the steady operation is about five times. Therefore, in comparison with a span of 40 minutes, the number of gas supply in the example is about 7 to 9, whereas the number of gas supply in the first comparative example is about 10 times. This is less than the number of times of gas supply in the first comparative example. That is, the input gas calorie | heat amount of an Example is less than the input gas calorie | heat amount of a 1st comparative example.

  The inventors of the present invention and the first comparative example respectively calculated the total value of the input gas calorific value when operated for 80 minutes in a steady state. As a result, in the example, the input gas calorific value was 6.49 MJ, while in the first comparative example, the input gas calorific value was 7.92 MJ, and the gas usage of the example was the same as that of the first comparative example. 1.43 MJ less than the amount used. When the difference in gas consumption for 80 minutes is converted into a year, heating energy of about 1 GJ can be reduced assuming that the heating operation is performed for 8 hours a day for 120 days in winter. This is a value corresponding to about one-fifteenth of the heating load of the energy consumption performance evaluation model based on the 2016 energy conservation standards.

  Further, in the second comparative example, as indicated by Y31 in FIG. 6, the number of times of gas supply per one time of gas use in the steady operation is about 13 to 14. Looking at the span of 120 minutes, the gas supply frequency of the example is about 21 to 27 times, and the gas supply frequency of the second comparative example is about 26 to 28 times. Is less than the number of times of gas supply in the second comparative example. That is, the input gas calorie | heat amount of an Example is less than the input gas calorie | heat amount of a 2nd comparative example. In addition, in the span of 120 minutes, the gas supply frequency of the first comparative example is about 30 times. Therefore, the input gas calorie | heat amount of a 2nd comparative example is less than the input gas calorie | heat amount of a 1st comparative example.

  Therefore, it was found that the energy consumption can be reduced by setting the cycle time to a time longer than the conventional 20 minutes for a house having a high airtightness and high heat insulation with a Q value of 1.5. In particular, it was found that when the cycle time was set to 40 minutes, a high energy saving effect was obtained.

  In addition, the present inventors also performed the simulation which set cycle time to 10 minutes. Conditions other than the fact that the cycle time and the duty ratio are half that of the first comparative example are the same as in the simulation of the first comparative example. As a result, the energy consumption when the cycle time was set to 10 minutes was about 1.1 times the energy consumption when the cycle time was set to 20 minutes. Therefore, it is not preferable for energy saving to make the cycle time shorter than the conventional cycle time of 20 minutes.

  As described above, the floor heating system 2 of the present embodiment is duty controlled when used in a house having a Q value of 2.0 or less, more preferably a house having a Q value of 1.0 or more and 2.0 or less. Is set in a range of 30 minutes to 60 minutes.

  The equipment that makes up the floor heating system is often standardized throughout Japan. Even in cold regions, it takes about 20 minutes for the floor heating system to circulate hot water at, for example, 60 ° C. between the heat source unit and the floor heating panel and to warm the floor to such an extent that the room temperature can be raised. It was. For example, in a house with low airtightness and heat insulation with a Q value of 4.0 to 5.0, the cycle time is set to 20 minutes in order to control the temperature of the thermal valve to the set temperature. It was optimal to do.

  However, in recent years, the development of highly heat-insulating heat insulating materials and the development of highly airtight sashes are progressing, and the high airtightness and high heat insulating properties of houses are progressing. And a floor heating system is often installed in the house which has high airtightness and high heat insulation. In a house with high airtightness and high thermal insulation, the temperature of a room once warmed is unlikely to drop. Therefore, for example, for a floor heating system installed in a house having a high air tightness and high heat insulation with a Q value of 1.5, when the cycle time is set to 20 minutes, the room temperature is higher than the set temperature, Opening the thermal valve will raise the room temperature. Therefore, the present inventors realized that it is necessary to review the cycle time, and performed the simulation as described above while changing the cycle time.

  For example, when the cycle time of a floor heating system installed in a house having a high airtightness and high heat insulation with a Q value of 1.5 is set to 10 minutes, the energy consumption is greater than when the cycle time is set to 20 minutes. Was big. This is the 10 minute cycle time, most of the time from opening the thermal valve and starting to circulate hot water between the heat source machine and the floor heating device until the floor heating device starts to dissipate and warm the floor. It is thought that the time for warming the feet by flowing warm water to the floor heating device is shortened and the thermal efficiency is poor.

  On the other hand, for example, when the cycle time of a floor heating system installed in a house having a high airtightness and high heat insulation with a Q value of 1.5 is set to 40 minutes, the cycle time is set to 20 minutes. In some cases, the room temperature could be adjusted around the set temperature. This is considered to be because the thermal valve can be opened by resetting the duty ratio in a state where the room temperature exceeds the set temperature. Further, when the cycle time was set to 40 minutes, the energy consumption could be reduced compared to the case where the cycle time was set to 20 minutes. This is presumably because the heat source machine no longer heats the hot water in a state where the room temperature exceeds the set temperature.

  Therefore, the inventors of the present invention have found that a floor heating system installed in a house having a high airtightness and high thermal insulation with a Q value of 1.5 has changed the cycle time and repeated simulations. It was judged that setting to minutes was appropriate.

  Here, the change in room temperature is affected by the heat insulation performance and airtightness performance of the house. Therefore, the cycle time needs to be shorter or longer than 40 minutes depending on the Q value. Specifically, for example, a house with a Q value of 2.0 has a lower room temperature than a house with a Q value of 1.5. In this case, the cycle time may be set to a time shorter than 40 minutes (for example, 30 minutes). Also, a house with a Q value of 1.0 is less likely to have a lower room temperature than a house with a Q value of 1.5. In this case, the cycle time may be set to a time longer than 40 minutes (for example, 60 minutes). Therefore, in a floor heating system used for a house having a Q value of 2.0 or less, more preferably a house having a Q value of 1.0 or more and 2.0 or less, the cycle time is set to 30 minutes or more and 60 minutes or less. The inventors have determined that it is sufficient.

  The floor heating system 2 of the present embodiment does not set the duty ratio of the ON time for opening the thermal valve 24 when 20 minutes have elapsed since the start of the cycle time of a certain cycle. Therefore, even if the floor heating system 2 is used in a house having a high airtightness and high heat insulation with a Q value of 2.0 or less, for example, the room temperature is reduced when 20 minutes have passed since the start of the cycle time. It is possible to avoid circulating the hot water heated by the heat source unit 23 between the heat source unit 23 and the floor heating panel 21 by opening the thermal valve 24 in a state exceeding the set temperature. Therefore, according to the floor heating system 2, it is possible to prevent the room temperature from being maintained above the set temperature and improve the room temperature adjustment performance. And the floor heating system 2 can suppress warming of the room air using useless energy, and can reduce energy consumption.

  In addition, the floor heating system 2 of the present embodiment, within a cycle time of a certain cycle, for example, when a window is opened for ventilation during floor heating and the room temperature becomes 1.0 ° C. or lower than the set temperature, Reset the cycle time, redo the duty control, and change the floor heating operation to raise the room temperature. Therefore, according to the floor heating system 2, the room temperature adjustment performance is good.

  In addition, this invention is not limited to the said embodiment, Various application is possible.

  A control device that performs the control illustrated in FIG. 3 may be provided separately from the floor heating remote controller 25 and the control board 231. In this case, the control device is provided separately from the room temperature sensor 255, the input unit 256, and the flash memory 254 of the floor heating remote controller 25. Further, the valve opening / closing control of the thermal valve 24 may be performed by the floor heating remote controller 25, or the control board 231 may be controlled by the control shown in FIG.

  The duty ratio setting table 2542 may be stored in an external device provided outside the floor heating remote controller 25, such as a flash memory 2315 of the control board 231 of the heat source unit 23 or a control device provided separately from the floor heating remote controller 25.

  In the above embodiment, the set temperature is manually set by a user input operation. However, the set temperature may be automatically set by a learning function or the like, for example.

  In the above configuration, instead of the thermal valve 24, another form of valve or device having a function of opening and closing the flow path may be used. The thermal valve 24 may be installed in the heat source unit 23.

  In the above embodiment, the predetermined value that is a criterion for determining the temperature deviation is set to −1.0 ° C. in S10 of FIG. 3, but this value is high heat insulation and high airtightness of the room in which the floor heating panel 21 is installed. It goes without saying that it may be changed as appropriate according to the conditions.

  In the above embodiment, it is determined whether the duty ratio is reset when 20 minutes have elapsed (S7 in FIG. 3: YES, S8, S9, S10), but the processing of S7 may be omitted. In this case, the processes of S8 to S10 are always performed within the cycle time to determine whether to reset the duty ratio. Then, when the temperature deviation becomes −1.0 ° C. or less within the cycle time, the duty ratio is reset. If the temperature deviation does not become −1.0 ° C. or less within the cycle time, the duty control is continued until the cycle time elapses.

  In the above embodiment, the room temperature sensor 255 is incorporated in the floor heating remote controller 25, but the room temperature sensor may be provided outside the floor heating remote controller 25.

  Either the timing of closing the thermal valve 24 and the timing of stopping the hot water heating may be earlier or simultaneously.

2 Floor heating system 21 Floor heating panel 22 Circulating circuit 23 Heat source machine 24 Thermal valve 231 Control board 254 Flash memory 255 Room temperature sensor 256 Input section

Claims (2)

A heat source machine for heating hot water;
A floor heating device that warms the floor by flowing hot water;
A circulation circuit connected to the heat source unit and the floor heating device, and circulating hot water between the heat source unit and the floor heating device;
An opening and closing device for opening and closing the circulation circuit;
A floor heating system comprising: a control device that performs duty control of the switchgear in a cycle time of 30 minutes or more and 60 minutes or less. In the floor heating system according to claim 1,
A room temperature detector for detecting the room temperature of the room in which the floor heating device is installed;
A setting unit for setting a set temperature of the room;
A storage unit that stores the set temperature set by the setting unit;
The control device includes:
A determination process for determining whether a temperature deviation obtained by subtracting the set temperature stored in the storage unit from the room temperature detected by the room temperature detection unit is a predetermined value or less;
In the determination process, when it is determined that the temperature deviation is equal to or less than a predetermined value, a reset process for resetting the cycle time when the determination is made and restarting the duty control;
In the determination process, when it is determined that the temperature deviation is not equal to or less than a predetermined value, a continuation process for continuing the duty control while maintaining a cycle time when the determination is made is performed. Floor heating system.

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