WO2019058516A1 - Heat exchanging type ventilation device - Google Patents

Abstract

The heat exchange type ventilator comprises a heat exchanger (4) for exchanging heat between a charge air flow (21) generated by the charge air blower (2) and an exhaust flow (22) generated by the exhaust blower (3). A first ventilation for sending the charge air flow (21) through the heat exchange with the exhaust flow (22) into the room, and a second charge air flow through the heat exchange with the exhaust flow (22); And a control unit (10) for controlling a ventilating air volume which is an air volume of the air supply flow (21) and the exhaust gas flow (22). Switching from the first ventilation at the first ventilation volume to the second ventilation at the second ventilation volume larger than the first ventilation volume is performed, and the second ventilation at the second ventilation volume is If the difference between the indoor temperature and the outdoor temperature continues to be less than the threshold, the control unit (10) changes the ventilation air volume from the second ventilation air volume to the first ventilation air volume.

Description

Heat exchange ventilation system

The present invention relates to a heat exchange ventilator that performs ventilation while exchanging heat between a charge air flow and an exhaust gas flow.

Heat exchange ventilation, which is ventilation with heat exchange between the outdoor air flow to the indoor air flow and exhaust flow from the indoor space to the outdoor air flow, and ventilation that does not involve heat exchange between the air flow and the exhaust air flow A heat exchange ventilator capable of switching between ventilation and ventilation is known. The heat exchange type ventilation device brings the temperature of the air taken into the room close to the temperature of the room by heat exchange ventilation to reduce the air conditioning burden on the room. In the case where the heat exchange type ventilation device can obtain the air conditioning effect by taking the outdoor air directly into the room without heat exchange, maintenance of the indoor comfortable air environment and reduction of the air conditioning load can be performed by performing normal ventilation. And make it possible. Further, the heat exchange type ventilation device can adjust the ventilation air volume which is the air volume of the air supply flow and the exhaust flow. In the heat exchange type ventilation device, maintenance of a comfortable air environment in the room and reduction of power consumption by reduction of air conditioning load are achieved by control of switching of ventilation and control of ventilation air volume.

In Patent Document 1, in heat exchange ventilation, the ventilation air volume is controlled based on the concentration of carbon dioxide (CO ₂ ) in the room, and when there is a switch from heat exchange ventilation to ordinary ventilation, it is independent of CO ₂ concentration. A heat exchange type ventilation device is disclosed which makes the ventilation air volume the maximum air volume.

Patent No. 3551124

In the heat exchange type ventilator of Patent Document 1, even if the normal ventilation is continued and the indoor temperature reaches the outdoor temperature, the normal ventilation with the maximum air volume is continued. The maximum air volume may be excessive compared to the ventilation air volume required to maintain the indoor air environment. For this reason, in the heat exchange type ventilation device of Patent Document 1, useless power consumption may be increased by continuing ventilation with an excessive air volume.

The present invention has been made in view of the above, and it is an object of the present invention to obtain a heat exchange type ventilator capable of making the indoor air environment comfortable and reducing power consumption.

In order to solve the problems described above and achieve the object, the heat exchange type ventilation device according to the present invention takes in air from the outside and feeds the taken air into the room, and an air supply fan and air from the room. Heat exchange between the exhaust flow that takes in and out the air taken out of the room, the heat exchanger that exchanges heat between the air supply flow generated by the air supply fan and the exhaust flow generated by the exhaust fan, and the exhaust flow Switching unit for switching between first ventilation for sending the supplied air flow into the room and second ventilation for sending the air flow not subjected to heat exchange with the exhaust flow to the room, ventilation which is an air volume between the air flow and the exhaust flow And a controller configured to control an air volume. Switching from the first ventilation at the first ventilation volume to the second ventilation at the second ventilation volume larger than the first ventilation volume is performed, and the second ventilation at the second ventilation volume is When the difference between the indoor temperature and the outdoor temperature becomes less than the threshold value continuously, the control unit changes the ventilation air volume from the second ventilation air volume to the first ventilation air volume.

The heat exchange type ventilator according to the present invention has the effect of making the indoor air environment comfortable and reducing power consumption.

The figure which shows the structure of the ventilator concerning Embodiment 1 of this invention. The figure which shows the state which the ventilation system shown in FIG. 1 performs normal ventilation. Block diagram showing the hardware configuration of the control unit shown in FIG. 1 A flowchart showing an operation procedure when the heat exchange ventilation of the ventilation system shown in FIG. 1 is switched to the ordinary ventilation. The flowchart which shows the operation | movement procedure in the case where the heat exchange ventilation of the ventilation system concerning Embodiment 2 of this invention switches to a normal ventilation.

Hereinafter, a heat exchange ventilator according to an embodiment of the present invention will be described in detail based on the drawings. The present invention is not limited by the embodiment.

Embodiment 1
FIG. 1 is a view showing a configuration of a ventilation device 100 according to a first embodiment of the present invention. The ventilator 100 is a heat exchange ventilator capable of ventilating while performing heat exchange between the charge air flow 21 and the exhaust gas flow 22. The ventilating apparatus 100 maintains a comfortable air environment in the room by ventilating the room by air supply from the outside to the room and exhaust air from the room to the outside. Further, the ventilation device 100 reduces the temperature difference between the air taken into the room and the air in the room by heat exchange between the air supply flow 21 and the exhaust flow 22 to reduce the air conditioning burden on the room.

The ventilating apparatus 100 includes an air supply fan 2 for taking in air from the outside and sending the taken air into the room, and an exhaust fan 3 for taking in air from the room and sending the taken air to the outside. The air supply fan 2 generates an air supply flow 21 by driving the motor 2a. The exhaust blower 3 generates an exhaust flow 22 by driving of the motor 3a. The ventilator 100 includes a heat exchanger 4 that exchanges heat between the charge air flow 21 and the exhaust gas flow 22. The air supply fan 2, the exhaust air fan 3 and the heat exchanger 4 are housed in the casing 1. In FIG. 1, components provided inside the casing 1 are schematically shown. The casing 1 is provided with an air supply passage 18 through which the air supply flow 21 passes, and an exhaust passage 19 through which the exhaust flow 22 passes.

At a side surface 1 a of the casing 1, an air supply inlet 6 and an exhaust outlet 7 are provided. An air supply outlet 8 and an exhaust air inlet 9 are provided on the side surface 1 b of the casing 1 opposite to the side surface 1 a. The ventilation device 100 takes in outdoor air from the air supply inlet 6 into the air supply passage 18. The air taken into the air supply passage 18 travels through the air supply passage 18 and is blown out from the air supply outlet 8 into the room. In addition, the ventilation device 100 takes indoor air into the exhaust air passage 19 from the exhaust suction port 9. The air taken into the exhaust air passage 19 travels along the exhaust air passage 19 and is blown out from the exhaust air outlet 7 to the outside. A partition wall 1 c provided inside the casing 1 partitions the supply air passage 18 and the exhaust air passage 19.

The heat exchanger 4 is provided between the supply air passage 18 and the exhaust air passage 19. The heat exchanger 4 performs total heat exchange between the air supply flow 21 traveling through the air supply air flow path 18 and the exhaust flow 22 traveling through the exhaust air flow path 19. The heat exchanger 4 includes a primary air passage through which the exhaust flow 22 passes and a secondary air passage through which the charge air flow 21 passes. In the heat exchanger 4, the primary air passage and the secondary air passage intersect perpendicularly. The primary air passage and the secondary air passage are formed in a laminate formed by alternately adhering flat paper and corrugated sheet which is corrugated paper. In FIG. 1, the illustration of the primary air passage and the secondary air passage is omitted.

The air filter 14 is detachably installed on the surface of the heat exchanger 4 to which the charge air flow 21 flows. The air filter 14 removes dust mixed in the air from the outside from the air supply flow 21. The air filter 15 is detachably installed on the surface of the heat exchanger 4 to which the exhaust flow 22 flows. The air filter 15 removes dust mixed in the air from the room from the exhaust flow 22. The ventilation device 100 prevents the heat exchanger 4 from being clogged by dust by providing the air filters 14 and 15.

The switching unit, the damper 5, switches between heat exchange ventilation, which is the first ventilation, and normal ventilation, which is the second ventilation. Heat exchange ventilation is ventilation that involves heat exchange between the charge air flow 21 and the exhaust gas flow 22. In heat exchange ventilation, the ventilation system 100 sends the air supply flow 21 that has undergone heat exchange with the exhaust flow 22 by the heat exchanger 4 into the room. The ventilation device 100 reduces the air conditioning load by bringing the temperature of the outdoor air closer to the temperature of the indoor air by heat exchange ventilation when the temperature in the room is more comfortable than in the outdoor.

Normal ventilation is ventilation without heat exchange between the charge air flow 21 and the exhaust gas flow 22. In normal ventilation, the ventilation system 100 sends an air supply flow 21 into the room which does not undergo heat exchange with the exhaust flow 22 by the heat exchanger 4. When the temperature is more comfortable outside the room than in the room, the ventilation device 100 sends air having a comfortable temperature from the outside to the room by normal ventilation, thereby making the room comfortable and reducing the air conditioning load.

The bypass air passage 17 is between the portion of the exhaust air passage 19 closer to the exhaust suction port 9 than the heat exchanger 4 and the portion of the exhaust air passage 19 closer to the exhaust air outlet 7 than the heat exchanger 4 , Is provided outside the heat exchanger 4. In FIG. 1, the bypass air passage 17 is located at the back of the air supply passage 18 in the drawing of the portion closer to the air supply outlet 8 than the heat exchanger 4. The damper 5 is provided at a branch between the inflow side portion of the heat exchanger 4 in the exhaust air passage 19 and the bypass air passage 17. The ventilation device 100 shown in FIG. 1 closes the bypass air passage 17 by the damper 5 and opens the inflow side portion of the heat exchanger 4 in the exhaust air passage 19. By causing the exhaust stream 22 to flow into the heat exchanger 4, the charge air stream 21 passes through heat exchange with the exhaust stream 22 in the heat exchanger 4 and reaches the charge air outlet 8. Thereby, the ventilator 100 performs heat exchange ventilation.

FIG. 2 is a view showing a state in which the ventilating apparatus 100 shown in FIG. 1 performs normal ventilation. By rotating the damper 5 from the state shown in FIG. 1, the ventilation device 100 opens the bypass air passage 17 and closes the inflow side portion of the heat exchanger 4 in the exhaust air passage 19 with the damper 5. In such a state, the ventilation system 100 causes the exhaust flow 22 to proceed to the bypass air passage 17. The exhaust flow 22 passes from the bypass air passage 17 to a portion of the exhaust air passage 19 closer to the exhaust air outlet 7 than the heat exchanger 4 and proceeds to the exhaust air outlet 7. By advancing the exhaust gas flow 22 to the bypass air passage 17 outside the heat exchanger 4, the charge air flow 21 passing through the heat exchanger 4 does not undergo heat exchange with the exhaust gas flow 22, and is supplied to the charge air outlet 8. To reach. Thereby, the ventilator 100 performs normal ventilation.

The temperature sensor 11 is provided in the air supply passage 18. The temperature sensor 11 detects the temperature outside the room by measuring the temperature of the air flowing into the air supply passage 18 from the air supply suction port 6. The temperature sensor 12 is provided in the exhaust air passage 19. The temperature sensor 12 detects the room temperature by measuring the temperature of the air flowing into the exhaust air passage 19 from the exhaust suction port 9.

The CO ₂ sensor 13 is provided in the exhaust air passage 19. The CO ₂ sensor 13 measures the CO ₂ concentration of the air flowing into the exhaust air passage 19 from the exhaust suction port 9. By providing the CO ₂ sensor 13 in the exhaust air passage 19, the signal line connecting the CO ₂ sensor 13 and the control unit 10 is shortened as compared with the case where the CO ₂ sensor 13 is provided outside the casing 1. And the construction cost of the ventilation device 100 can be reduced. In FIG. 1 and FIG. 2, illustration of a signal line connecting the CO ₂ sensor 13 and the control unit 10 is omitted.

The ventilator 100 includes a control unit 10 that controls the entire ventilator 100. The control unit 10 is attached to the outer surface of the casing 1 and can be easily maintained. The control unit 10 controls the ventilation air flow of the ventilation device 100 by controlling the drive of the motor 2 a of the air supply blower 2 and the drive of the motor 3 a of the exhaust air blower 3. The ventilation air volume is the air volume of the charge air flow 21 and the exhaust gas flow 22. The control unit 10 also controls switching between heat exchange ventilation and normal ventilation by controlling the operation of the damper 5.

The remote controller 16 receives various commands to the ventilator 100 such as turning on and off the ventilator 100, switching the ventilation air volume, switching between heat exchange ventilation and normal ventilation, and setting an operation timer. The remote controller 16 outputs the command received from the user to the control unit 10. The control unit 10 controls the operation of the ventilator 100 based on the command input from the remote controller 16.

The ventilation device 100 can arbitrarily change the ventilation air volume by the operation of the remote controller 16. The ventilation device 100 can suppress the deterioration of the indoor air environment and improve the air environment by increasing the ventilation air volume as the number of people in the room increases. The ventilation device 100 maintains a comfortable air environment and reduces power consumption by driving the motors 2a and 3a by reducing the amount of ventilation air flow as the number of people in the room decreases. The control unit 10 may control the ventilation air volume by detecting the degree of deterioration of the indoor air environment from the CO ₂ concentration measured by the CO ₂ sensor 13.

The control unit 10 is realized using a hardware configuration. FIG. 3 is a block diagram showing the hardware configuration of the control unit 10 shown in FIG. In the first embodiment, the hardware configuration of the control unit 10 is a microcontroller. The functions of the control unit 10 are executed on a program analyzed and executed by the microcontroller. Note that part of the functions of the control unit 10 may be executed on hardware using wired logic.

The control unit 10 includes a processor 31 which executes various processes, and a memory 32 in which programs for various processes are stored. The processor 31 and the memory 32 are connected to each other via a bus 33. The processor 31 develops the loaded program, and executes various processes for controlling the ventilation device 100 by the control unit 10.

Next, the operation of the ventilator 100 will be described. Here, the operation of the ventilation device 100 in the case where the air conditioner interlocked with the ventilation device 100 cools the room is taken as an example.

During the cooling operation of the air conditioner, the outdoor temperature may be lower than the indoor temperature in summer morning, spring and autumn mornings and in the evening, and the outdoor temperature may be more comfortable than the room temperature. The ventilation device 100 performs automatic switching from heat exchange ventilation to normal ventilation when the outdoor temperature is lower than the room temperature during operation by heat exchange ventilation. The ventilating apparatus 100 maintains the comfortable air environment of the room and reduces the air conditioning load by directly bringing in the room, which is cooler than room air and comfortable outside air, by normal ventilation.

The ventilation device 100 can set the ventilation air volume in normal ventilation by the operation of the remote controller 16. When the ventilation air volume in the normal ventilation is not set, the ventilation device 100 takes over the same ventilation air volume as the heat exchange ventilation in the normal ventilation when the heat exchange ventilation is switched to the normal ventilation. Be For example, it is assumed that the ventilation air volume can be set from five air volume levels set so that the air volume decreases in the order of "highest level", "high level", "medium level", "low level" and "lowest level" , It is assumed that there has been a switch from heat exchange ventilation with "minimum level" ventilation air volume to normal ventilation. In this case, the ventilation device 100 performs normal ventilation with the “minimum level” ventilation air volume, unless the ventilation air volume in the normal ventilation is set.

In order to quickly bring the indoor temperature close to the comfortable outdoor temperature, it is desirable that the ventilation air flow of the normal ventilation be larger when the heat exchange ventilation is switched to the normal ventilation. The ventilation apparatus 100 can effectively reduce the air conditioning burden by setting the “maximum level” to the ventilation air volume in the normal ventilation. In addition, the ventilator 100 can effectively reduce the concentration of CO _{2 in} the room when the number of people in the room is large.

The room temperature may be the same as the outdoor temperature by continuing the normal ventilation with the "highest level" ventilation air volume. When the room temperature has reached a comfortable temperature, the room temperature can be maintained at a comfortable temperature even if the ventilation air volume is smaller than the "maximum level". In addition, when the number of people in the room is low and the CO ₂ concentration is low, even if the ventilation air volume is smaller than the “maximum level”, the low CO ₂ concentration can be maintained. In this case, the ventilation air volume which is the “highest level” becomes larger than the ventilation air volume required for maintaining the indoor air environment. The ventilation device 100 consumes a lot of unnecessary power by continuing normal ventilation with an excessive ventilation air volume.

In the first embodiment, when the ventilation air volume set for normal ventilation is larger than the ventilation air volume for heat exchange ventilation, the ventilation device 100 sets the ventilation air volume when switching from heat exchange ventilation to normal ventilation is performed. Perform normal ventilation in the Ventilation system 100, when the normal ventilation with the set ventilation air volume is continued and the difference between the room temperature and the outdoor temperature becomes less than the threshold, the ventilation air volume in the normal ventilation, the small ventilation at the time of heat exchange ventilation Change to the air volume. Thereby, the ventilator 100 can reduce unnecessary power consumption by maintaining a comfortable air environment in the room and changing the ventilation air volume according to the room temperature.

FIG. 4 is a flowchart showing an operation procedure in the case where the heat exchange ventilation of the ventilator 100 shown in FIG. 1 is switched to the normal ventilation. FIG. 4 shows an operation procedure of the ventilating apparatus 100 when the outdoor temperature decreases from the temperature higher than the indoor temperature at the time of cooling the room.

In step S1 a starting step of the operation procedure shown in FIG. 4, the ventilation device 100 performs a heat exchange ventilator with a first ventilation power ventilation power Q _A. Control unit 10, as the exhaust and supply air in the ventilation air volume Q _A is performed by the ventilator 100, controls the the driving motor 2a of the supply air blower 2 and the driving of the exhaust blower 3 of the motor 3a. As shown in FIG. 1, the damper 5 is in a state of closing the bypass air passage 17.

In step S2, the control unit 10 determines whether the outdoor temperature T _OUT detected by the temperature sensor 11 is lower than the indoor temperature T _IN detected by the temperature sensor 12. If the outdoor temperature T _OUT is equal to or higher than the indoor temperature T _IN , that is, if T _OUT <T _IN does not hold (Step S2, No), the ventilator 100 returns the procedure to Step S1 and continues the heat exchange ventilation.

If the outdoor temperature T _OUT is lower than the indoor temperature T _IN , that is, if T _OUT <T _IN holds (Step S2, Yes), the control unit 10 determines in Step S3 that the second ventilation air volume, that is, the ventilation air volume Q _B Check if there is a setting. The ventilation air flow Q _B is a ventilation air flow in normal ventilation. The user, by operating the remote controller 16 can be set to any ventilating airflow Q _B. Note that the case where T _OUT <T _IN is satisfied means that the outdoor temperature T _OUT is lower than the indoor temperature T _IN and comfortable.

State if there is no setting of the ventilation air volume Q _B (step S3, No), the control unit 10, which closes from the state shown in FIG. 1, the inflow-side portion of the exhaust flow 22 out of the heat exchanger 4 as shown in FIG. 2 The damper 5 is operated so that The damper 5 switches the ventilation by the ventilation device 100 from heat exchange ventilation to normal ventilation. Control unit 10 continues to the air supply in the ventilation power Q _A and exhaust is performed, controls the the driving motor 2a of the supply air blower 2 and the driving of the exhaust blower 3 of the motor 3a. Thus, the ventilation device 100, at step S7, to implement common ventilation in ventilation power _{Q A.}

If there is a setting of the ventilation air volume Q _B (step S3, Yes), in step S4, the control unit 10, whether the ventilation power Q _A greater or not when ventilation air volume Q _B that is set in the heat exchange ventilator to decide. When the ventilation air volume Q _B is equal to or less than the ventilation air volume Q _A , that is, when Q _B > Q _A does not hold (Step S4, No), the ventilator 100 performs normal ventilation with the ventilation air volume Q _A in Step S7. Do.

If ventilation power _{Q B} is greater than the ventilation power _{Q A,} i.e. _Q B> _{If Q A} holds (step S4, Yes), the control unit 10, operates the damper 5 to the state shown in FIG. 2 from the state shown in FIG. 1 Let The damper 5 switches the ventilation by the ventilation device 100 from heat exchange ventilation to normal ventilation. Control unit 10, so as to increase ventilation airflow from the ventilation air volume Q _A to ventilation power Q _B, controls the the driving motor 2a of the supply air blower 2 and the driving of the exhaust blower 3 of the motor 3a. Thus, the ventilation device 100, in step S5, carrying out the usual ventilation in ventilation power _{Q B.} Ventilator 100 by conventional ventilation in ventilation power Q _A greater ventilation power Q _B, as compared with the case where ordinary ventilation in ventilation power Q _A is continued, the indoor temperature T _IN comfortable outdoor temperature T _OUT It will be possible to get closer quickly. The ventilation air flow Q _B satisfying Q _B > Q _A may be the “maximum level” ventilation air flow described above.

After starting normal ventilation in step S5, the control unit 10 determines in step S6 whether or not the difference T _IN -T _OUT between the indoor temperature T _IN and the outdoor temperature T _OUT is smaller than a threshold value ΔT _TH . The threshold value ΔT _TH is a value representing a temperature difference between the case where the indoor temperature T _IN is the same as the outdoor temperature T _OUT and the temperature at which the difference in sensed temperature is not felt, and is set in the ventilator 100 . If the difference T _IN -T _OUT is equal to or _larger than the threshold ΔT _TH , that is, if T _IN -T _OUT <ΔT _TH does not hold (Step S6, No), the ventilator 100 returns the procedure to Step S5, and the ventilation air volume continue the normal ventilation in the Q _B.

If the difference T _IN -T _OUT is smaller than the threshold ΔT _TH , that is, if T _IN -T _OUT <ΔT _TH holds (step S6, Yes), the controller 10 determines the ventilation air volume from the ventilation air volume Q _B to the ventilation air volume Q The drive of the motor 2 a of the air supply blower 2 and the drive of the motor 3 a of the exhaust air blower 3 are controlled so as to reduce to _A. Thus, the ventilation device 100, at step S7, to implement common ventilation in ventilation power _{Q A.}

Thus, the heat exchange ventilator of the ventilation air volume Q _A, switching to ordinary ventilation in ventilation power Q _A greater ventilating air volume Q _B is performed, usually ventilation is continued room temperature in ventilation power Q _B When the difference T _IN −T _OUT between T _IN and the outdoor temperature T _OUT becomes smaller than the threshold ΔT _TH , the control unit 10 changes the ventilation air volume from the ventilation air volume Q _B to the ventilation air volume Q _A. Ventilator 100 by automatically lowering the ventilation power from the ventilation air volume Q _B to the ventilation power Q _A, than the ventilation air volume required for the maintenance of the indoor air environment can be avoided a state amount ventilating air is excessive. Thus, the ventilator 100 can maintain a comfortable air environment in the room and reduce unnecessary power consumption.

If the number of people when the heat exchange ventilator in step S1 was a small or zero, the ventilating air volume Q _A when the heat exchange ventilation, if the ventilation air volume of the "minimum level" to the aforementioned is set is there. In this case, the ventilation device 100, at step S7, to implement common ventilation with a ventilation power ventilation power Q _A of the "minimum level". In case from the time of the heat exchange ventilation step S1 of ordinary ventilation in step S5, if the number of people is small or zero state is continued, the ventilator 100, ventilation power ventilation air volume from the ventilation air volume Q _B Even if reduced to Q _A , the comfortable air environment in the room can be maintained.

The ventilation device 100 ends the operation in switching from heat exchange ventilation to normal ventilation by normal ventilation in step S7. In the case where the number of people in the room at the time of normal ventilation in step S5 is larger than that of heat exchange ventilation in step S1, the ventilator 100 changes the volume of ventilation air in step S7. operation or control of the control unit 10 based on the CO ₂ concentration may be a ventilating air volume is increased from ventilation power Q _a. Thus, the ventilation device 100 can maintain a comfortable air environment in the room in response to a change in the air environment in the room.

Further, after the operation procedure shown in FIG. 4 when the outdoor temperature _{T OUT} was lower than the room temperature _{T IN} temperature, if changed to a temperature higher than the room temperature _{T IN,} i.e. _T OUT _{<T IN} is no longer satisfied The ventilator 100 switches from normal ventilation to heat exchange ventilation, and repeats the process from step S1.

Incidentally, the ventilation device 100, when the indoor temperature _{T IN} becomes the same as the outdoor temperature _{T OUT,} i.e. the difference between _T IN _{-T when OUT} becomes zero, ventilation power Q from the ventilating air quantity _{Q B} in step S7 _You may change the ventilation air volume to _A. In this case, in step S6, the control unit 10 determines whether the indoor temperature T _IN has become equal to the outdoor temperature T _OUT . Also in this case, the ventilator 100 can maintain a comfortable air environment in the room and reduce unnecessary power consumption.

Even when the air conditioner heats the room, the ventilation system 100 may switch from heat exchange ventilation to normal ventilation as in the operation procedure at the time of cooling shown in FIG. 4. During the daytime of winter during the heating operation of the air conditioner, the outdoor temperature may be higher than the indoor temperature, and the outdoor temperature may be more comfortable than the indoor temperature. The ventilation device 100 performs automatic switching from heat exchange ventilation to normal ventilation when the outdoor temperature is higher than the room temperature during operation by heat exchange ventilation. The ventilating apparatus 100 maintains the comfortable air environment of the room and reduces the air conditioning load by directly taking in the comfortable outside air having a temperature higher than the room air by normal ventilation.

The ventilation device 100 performs an operation according to the same procedure as FIG. 4 when the outdoor temperature rises from a temperature lower than the indoor temperature at the time of heating the room. In this case, the control unit 10 determines whether the outdoor temperature T _OUT is higher than the indoor temperature T _IN , contrary to step S2. When the outdoor temperature T _OUT is higher than the indoor temperature T _IN and the ventilation air volume Q _B larger than the ventilation air volume Q _A is set, the ventilation device 100 performs normal ventilation with the ventilation air volume Q _B. After starting the normal ventilation, the control unit 10 determines whether the difference T _OUT -T _IN between the outdoor temperature T _OUT and the indoor temperature T _IN is smaller than a threshold value ΔT _TH . If the difference _T OUT _{-T IN} is less than the threshold value [Delta] T _TH, the control unit 10 changes the ventilation power from the ventilation air volume _{Q B} to the ventilation power _{Q A.} The ventilation device 100 can maintain a comfortable air environment in the room and reduce wasteful power consumption even during heating.

According to the first embodiment, after switching from heat exchange ventilation with ventilation air volume Q _A to normal ventilation with ventilation air volume Q _B , ventilation device 100 switches between indoor temperature T _IN and outdoor temperature T _OUT . If the difference _T iN _{-T OUT} is less than the threshold value [Delta] T _TH, changing the ventilation power from the ventilation air volume _{Q B} to the ventilation power _{Q a.} As a result, the ventilation device 100 has the effect of making the indoor air environment comfortable and reducing power consumption.

Second Embodiment
FIG. 5 is a flowchart showing an operation procedure in the case where the heat exchange ventilation of the ventilator 100 according to the second embodiment of the present invention is switched to the normal ventilation. The ventilator 100 according to the second embodiment has the same configuration as the ventilator 100 according to the first embodiment shown in FIG. In the second embodiment, the description overlapping with that of the first embodiment is omitted.

In the second embodiment, the ventilation device 100, since the ordinary ventilation to continue in the same ventilation air volume _{Q B} in step S5 shown in FIG. 4, the indoor temperature _{T IN} and the outdoor temperature _T difference between _OUT threshold [Delta] T _TH a case was below, and when the CO ₂ concentration in the chamber is lower than a preset concentration, changes the ventilation power from the ventilation air volume Q _B to the ventilation power Q _a. FIG. 5 shows the operation procedure of the ventilating apparatus 100 when the outdoor temperature falls from a temperature higher than the room temperature during cooling of the room.

The ventilator 100 performs the operations from step S1 to step S6 as in the case of the first embodiment shown in FIG. If the difference T _IN -T _OUT is smaller than the threshold ΔT _TH , that is, if T _IN -T _OUT <ΔT _TH holds (Yes in step S6), the control unit 10 measures the CO ₂ sensor 13 in step S11. It is determined whether or not the value of the CO ₂ concentration is less than the set value. The set value of the CO ₂ concentration is a value used as a reference of whether or not the indoor air environment is deteriorated, and is assumed to be preset in the ventilator 100.

If the measured value of CO ₂ concentration is equal to or higher than the set value (No at Step S11), the ventilator 100 returns the procedure to Step S5, and performs normal ventilation with a ventilation air volume Q _B larger than the ventilation air volume Q _A to continue.

As described above, the heat exchange ventilation is switched to the normal ventilation according to the determination in step S4, and the difference T _IN -T _OUT is confirmed to be less than the threshold ΔT _TH in step S6, and it is measured. when CO ₂ concentration is preset concentration or more, the control unit 10 maintains the ventilation power ventilation air volume Q _B. Even if the difference T _IN -T _OUT is less than the threshold ΔT _TH , the ventilation device 100 has the ventilation air volume Q _A when the CO ₂ concentration is higher than the set concentration and the deterioration of the air environment is detected. to continue the normal ventilation in larger ventilation air flow rate Q _B. Thereby, the ventilator 100 can improve the indoor air environment at an early stage.

If the value of the measured CO ₂ concentration is less than the set value (step S11, Yes), the ventilation device 100 lowers the ventilation power from the ventilation air volume _{Q B} to the ventilation power _{Q A.} Thus, the ventilation device 100, at step S7, to implement common ventilation in ventilation power _{Q A.}

As described above, the heat exchange ventilation is switched to the normal ventilation according to the determination in step S4, and the difference T _IN -T _OUT is confirmed to be less than the threshold ΔT _TH in step S6, and it is measured. when CO ₂ concentration is below the concentration which is set in advance, the control unit 10 changes the ventilation power from the ventilation air volume Q _B to the ventilation power Q _a. In the case where the difference T _IN -T _OUT is less than the threshold ΔT _TH , the ventilation device 100 changes the ventilation air volume from the ventilation air volume Q _B to the ventilation air volume Q _A on condition that the CO ₂ concentration is less than the set concentration. Lower. After confirming that the air environment is in a good state, the ventilating apparatus 100 can avoid a state in which the ventilation air volume is larger than the ventilation air volume required for maintaining the indoor air environment. Thus, the ventilator 100 can maintain a comfortable air environment in the room and reduce unnecessary power consumption.

Even when the air conditioner heats the room, the ventilation system 100 may switch from heat exchange ventilation to normal ventilation as in the operation procedure at the time of cooling shown in FIG. 5. The ventilation device 100 can maintain a comfortable air environment in the room and reduce wasteful power consumption even during heating.

According to the second embodiment, the ventilation device 100, if the measured CO ₂ concentration is below the concentration which is set in advance, it changes the ventilation power from the ventilation air volume Q _B to the ventilation power Q _A. The ventilator 100 can maintain a comfortable air environment in the room and reduce unnecessary power consumption. Further, the ventilation device 100, if the measured CO ₂ concentration is below the concentration which is set in advance, continues normal ventilation in ventilation power Q _A greater ventilation power Q _B. The ventilator 100 can improve the indoor air environment at an early stage. As a result, the ventilation device 100 has the effect of making the indoor air environment comfortable and reducing power consumption.

The configuration shown in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and one of the configurations is possible within the scope of the present invention. Parts can be omitted or changed.

Reference Signs List 1 casing, 1a, 1b side surface, 1c partition wall, 2 air supply blower, 2a, 3a motor, 3 exhaust air blower, 4 heat exchanger, 5 dampers, 6 air supply inlet, 7 exhaust air outlet, 8 air supply outlet , 9 exhaust suction port, 10 control unit, 11, 12 temperature sensor, 13 CO ₂ sensor, 14, 15 air filter, 16 remote controller, 17 bypass air path, 18 air supply air path, 19 exhaust air path, 21 air supply flow, 22 exhaust flow, 31 processors, 32 memories, 33 buses, 100 ventilators.

Claims (3)

An air supply fan that takes in air from the outside and sends the taken air into the room;
An exhaust blower for taking in air from the room and sending the taken air to the outside of the room;
A heat exchanger for performing heat exchange between the air supply flow generated by the air supply fan and the exhaust flow generated by the exhaust fan;
The first ventilation for sending the air supply flow that has undergone the heat exchange with the exhaust flow into the room and the second ventilation that sends the air supply flow that does not undergo the heat exchange with the exhaust flow to the room are switched A switching unit,
A control unit that controls a ventilation air volume which is an air volume of the air supply flow and the exhaust flow;
Equipped with
Switching from the first ventilation at the first ventilation volume to the second ventilation at the second ventilation volume larger than the first ventilation volume is performed, and the second ventilation at the second ventilation volume is performed. When the second ventilation is continued and the difference between the indoor temperature and the outdoor temperature becomes less than a threshold, the control unit determines the ventilation air volume from the second ventilation air volume to the first ventilation. A heat exchange type ventilation system characterized by changing to an air volume. The switching from the first ventilation to the second ventilation is performed, and the second ventilation with the second ventilation air volume is continued, so that the difference between the indoor temperature and the outdoor temperature is the same. If the concentration is lower than the threshold and the concentration of carbon dioxide in the room is lower than a preset concentration, the control unit determines the ventilation air volume from the second ventilation air volume and the first ventilation air volume The heat exchange type ventilation system according to claim 1, wherein the heat exchange type ventilation system is changed to the above. The switching from the first ventilation to the second ventilation is performed, and the second ventilation with the second ventilation air volume is continued, so that the difference between the indoor temperature and the outdoor temperature is the same. The control unit is configured to maintain the ventilation air volume at the second ventilation air volume when the concentration is lower than the threshold and the concentration of carbon dioxide in the room is higher than the set concentration. The heat exchange ventilator as claimed in claim 2.

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