JP2000121079A - Floor heating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To previously prevent a system already in operation from being overheated owing to circulation of high temperature water due to starting of another system. SOLUTION: The present floor heating system is adapted such that warm water is supplied from one heat source machine 1 to 2 system heating floors 2A, 2B, and the respective heating floors are individually controlled on the basis of a correlation table, and further rapid temperature rise operation is executed for a predetermined time since actuation thereof for each system. In this case, a system already in operation (e.g. 2A) is prevented from being overheated owing to circulation of high temperature water caused by actuation of another system (e.g. 2B). Besides a main series used stationarily as an on-off duty a sub series having a shorter on-off duty is prepared. When another system undergoes the rapid temperature rise, the on-off duty on a stationary operation is changed over to that of the sub series side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor heating system in which a single heat source unit supplies hot water to a plurality of heating floors.

[0002]

2. Description of the Related Art In general, in a hot water type floor heating system, hot water of a constant temperature (for example, 60 ° C.) is supplied from a heat source unit, and a room temperature or a floor temperature is detected inside a room and temperature control is performed by opening and closing a control valve. Is going. Therefore, at the beginning of operation when the difference between the set temperature and the detected temperature is large, the control valve is naturally continuously opened. However, in order to reduce the time required to reach the steady temperature as much as possible, the tapping of the heat source unit is conventionally performed. A rapid temperature raising method has been developed in which the temperature is switched between two stages, and at the start of operation, high-temperature water (for example, 80 ° C.) is forcibly circulated for a certain period of time.

[0003]

However, recently, there has been an increasing demand for a system for supplying hot water from one heat source unit to a plurality of heating floors. Had the following problems. That is, when the two heating floors separately start operating, one of the systems already reaches the set temperature and performs steady operation, that is, when temperature control is performed by an on / off pattern corresponding to a difference ΔT between the set temperature and the detected temperature. On the other hand, when the other system enters a rapid temperature raising operation, that is, a forced continuous high temperature operation, on the steady operation side, for example, high temperature water of 80 ° C. flows in an on / off pattern set at 60 ° C., and the temperature rises excessively. . Of course, in this case, the temperature difference ΔT becomes large, so that the on / off pattern of the control valve changes, and the temperature is theoretically controlled at the set temperature. Because the response of the control is slow, the first system cannot reach an equilibrium state by the end of the rapid heating period of the second system, and during this time the temperature of the first system becomes abnormal The result is too high. An object of the present invention is to solve such a problem.

[0004]

The hot water floor heating system according to the present invention comprises, as shown in FIGS. 1 and 2, pipes for supplying constant temperature hot water from a heat source unit 1 to two heating floors 2A and 2B. And a correlation table 4 for associating the on-off duty of the control valve with the difference between the set temperature and the output of the temperature sensor, and the heating table 2A, 2B is individually identified by the correlation table 4. In the floor heating system, the temperature of the hot water from the heat source unit 1 is switched to a high temperature for rapid temperature rise for a certain period of time from the start of each system, and the difference between the start times of the two systems is controlled. In the case where one occurs and the other performs a steady operation during the rapid temperature rise operation, two types of on / off duty sequences of the correlation table 4 are set so that the on-duty on the steady operation side is switched to be shortened. Since one heat source unit 1 is shared by two systems, the already operating system (for example, 2A) is overheated by the circulation of high-temperature water by starting another system (for example, 2B). This is to prevent that from happening.

[0005]

1 and 2 show an example of the configuration of the system of the present invention. Hot water is supplied from one heat source unit 1 to two heating floors 2A and 2B, and each branch pipe is connected to a branch pipe. Control valves 3A and 3B are interposed respectively, and in order to control each of the control valves 3A and 3B, a correlation table 4 for associating the on / off duty of the control valve with the difference ΔT between the set temperature and the temperature sensor output.
Is provided. The control of the control valves 3A and 3B is performed by detecting the temperature of each heating floor 2A and 2B, or when the two heating floors 2A and 2B are in separate rooms, they are controlled by the room temperature sensors of each room. However, in the present embodiment, 2
The heating floors 2A, 2B of the system are provided in the same room, and the two control valves 3A, 3B are individually controlled by the output of one room temperature sensor 5. For this purpose, one of the two systems is assigned a priority system. , The other being a dependent system, a duty corresponding to the difference ΔT between the output of the room temperature sensor 5 and the set temperature of the heating floor 2A is obtained from the correlation table 4, and the control valve 3A on the priority side is controlled by this duty, and The control valve 3B controls the two systems with the same correlation table 4 by appropriately shifting the correlation table 4 by the number of steps according to the difference between the set temperatures of the priority system and the subordinate system.
As described above, the on / off control valve 3 using the correlation table 4 is used.
By controlling A and 3B, the floor temperature does not suddenly become hot or cold according to the fluctuation of the room temperature,
This is a kind of proportional control.

FIG. 2 shows an example of the configuration of the control panel 6.
Table 1 shows an example of the correlation table 4. CP
In U, a predetermined program calculates the number of steps to be biased from the set temperatures Ta and Tb input from the terminal device 7 (for example, shifts one step per set temperature difference of 2 ° C.), and calculates the correlation table 4 (however, the duty before switching). ), With respect to the ever-changing room temperature,
The on / off duty of each heating floor A, B is calculated, and each control valve 3A, 3B is controlled based on the result.

[0007] As described above, the present invention uses two heat sources from a single heat source unit.
In a floor heating system in which hot water is supplied to a heating floor of a system, in order to warm a cold room as quickly as possible, a tapping temperature (for example, 60 ° C.) from the heat source unit 1 for each system 2A, 2B for a certain period of time from the start. Is switched to a high temperature (for example, 80 ° C.) for rapid temperature rise. However, if the start timings of the two systems are different, the system
In A, proportional control has already been performed according to the on / off pattern, and if the supplied hot water is switched from 60 ° C. to 80 ° C., the heating floor will be overheated with the same on / off pattern, so that it can be dealt with. It was made. That is, when the other system is already performing the steady operation while the other system is already performing the steady operation during the heating operation of one system, or when the steady operation is about to be started, the duty on the steady operation side is switched to shorten the ON period. Therefore, as shown in Table 1, the correlation table 4 has two types of on-off duty sequences, a main sequence and a sub-sequence.

Table 1 shows an example of the contents of the correlation table. In accordance with the difference ΔT between the set temperature and the detected temperature, the duty sequence before and after the switching, that is, the main sequence and the sub sequence, are set. I have. After reaching steady state,
No. in the table Usually, the temperature rises and falls in the vicinity of 5-7.
The reason that the ratio of the ON period to ° C is 2: 1 is as follows.
For example, before switching (main series), the input temperature to the heating floor was 60 ° C, the output temperature was 40 ° C, and the difference was 20 ° C. After switching (subseries), the input temperature was 80 ° C.
This is because the output temperature is 40 ° C., the difference is 40 ° C., and the amount of heat released is approximately 2: 1. N in the table
o. In 1-4, the longer the on-period, the shorter the on-period after the switching is because even if the hot water is stopped, it takes some time until the temperature drops, This is also because the temperature of the hot water during the off-period does not drop completely, and the actual average heat release increases. In addition, No. in the table In 9-10,
The shorter the off-period, the higher the on-ratio after switching is because the hot water temperature does not rise within the short on-period just because of the opposite reason, and the actual amount of released heat is reduced. It is.

FIG. 3 shows an example of the operating state of the system of the present invention. FIG. 3 (a) shows that the first series ends the rapid heating operation and enters a steady operation, and then the second series executes the rapid heating operation. It is a time chart at the time of starting. In the figure, a is an on-period before switching, and b is an on-period after switching. When the operation of the other system is started while the operation of the other system is started, the temperature of the room has already risen.
Minute). (B) shows a case in which the second series starts heating while the first series is still rapidly rising. In this case, the room is already warmed up.
The second series of rapid heating periods is terminated when 30 minutes have elapsed after the completion of the first series of heating (the total of the rapid heating periods is 90 minutes).

[0010]

According to the present invention, as described above, hot water is supplied from one heat source unit 1 to two heating floors 2A and 2B, and each heating floor is individually controlled by the correlation table 4 while being controlled. In a floor heating system in which a rapid heating operation is performed for a certain period of time from the start of each system, when a difference occurs in the start timing of the two systems and one of the systems performs a steady operation during the rapid heating operation of the other system, Since the on / off duty on the steady operation side is switched from the main system at the time of steady operation to a sub-system with a short on-period prepared in advance, the system that is already operating (for example, 2A) is different from that of another system (for example, 2B). There is an advantage that it is possible to prevent overheating due to the circulation of high-temperature water during startup.

[Brief description of the drawings]

FIG. 1 is a piping system diagram of one embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration example of a control panel used in the above.

FIG. 3 is a time chart showing an operation state of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat source unit 2A, 2B Heating floor 3A, 3B Control valve 4 Correlation table 5 Room temperature sensor 6 Control panel 7 Terminal

[Table 1]

Claims (2)

[Claims] 1. A control valve is interposed in each pipe for supplying hot water of a constant temperature from a single heat source unit to two heating floors, and a control valve is provided for a difference between a set temperature and a temperature sensor output. In a floor heating system in which a correlation table corresponding to the on / off duty of each is provided and each heating floor is individually controlled by the correlation table, the temperature of hot water from the heat source unit is rapidly increased for a certain period of time from the start of each system. In the case where a difference is made in the start timing of the two systems and one of the two systems performs a rapid temperature increase operation while the other is performing a rapid temperature increase operation, the on-duty on the steady operation side is switched. A floor heating system, wherein two types of on-off duty sequences of the correlation table are provided so as to be shortened. 2. In a floor heating system for supplying hot water from a single heat source unit to two heating floors in the same room, when operation of one system is started during operation of the other system, the other system is started. 2. The floor heating system according to claim 1, wherein a rapid heating time of the system is shortened.