WO2022085177A1 - 換気装置 - Google Patents

換気装置 Download PDF

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Publication number
WO2022085177A1
WO2022085177A1 PCT/JP2020/039903 JP2020039903W WO2022085177A1 WO 2022085177 A1 WO2022085177 A1 WO 2022085177A1 JP 2020039903 W JP2020039903 W JP 2020039903W WO 2022085177 A1 WO2022085177 A1 WO 2022085177A1
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WO
WIPO (PCT)
Prior art keywords
air
temperature
heat exchanger
air supply
temperature sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/039903
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English (en)
French (fr)
Japanese (ja)
Inventor
康敬 落合
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2020/039903 priority Critical patent/WO2022085177A1/ja
Priority to JP2022556347A priority patent/JP7433465B2/ja
Publication of WO2022085177A1 publication Critical patent/WO2022085177A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
    • F24F7/08—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with separate ducts for supplied and exhausted air with provisions for reversal of the input and output systems

Definitions

  • This disclosure relates to a ventilation system equipped with a total heat exchanger.
  • Patent Document 1 describes an air supply fan provided with an air supply motor, an exhaust fan provided with an exhaust motor, and a total heat exchanger for exchanging heat when ventilating indoor air and outdoor air.
  • a temperature detecting means provided on the air supply inlet side of the heat exchange element in the air supply / ventilation path and a humidity detecting means provided on the exhaust inlet side of the heat exchange element in the exhaust air blowing path.
  • the rotation speed of the air supply motor and the exhaust motor is reduced according to the temperature detected by the air supply and the humidity detected by the humidity detection means, and the air supply air volume and the exhaust air volume are reduced to exhaust the total heat exchanger. It prevents dew condensation that occurs at the side outlet.
  • filters for air purification are provided on the outdoor air suction side and the indoor air suction side of the total heat exchanger, respectively.
  • Patent Document 1 can prevent dew condensation on the total heat exchanger, but detects that an abnormality has occurred due to an abnormality due to dew condensation or freezing, or an abnormality due to a decrease in air volume caused by clogging of a filter or the like. There was a problem that it could not be done.
  • the present disclosure has been made to solve the above problems, and when an abnormality due to dew condensation or freezing or an abnormality due to a decrease in air volume caused by filter clogging occurs, it is necessary to detect the occurrence of such abnormality.
  • the purpose is to provide a ventilation system that can be used.
  • the ventilation device is arranged in the casing and the casing in which the air supply passage through which the air blown from the air supply port passes and the exhaust passage through which the air blown out from the exhaust port passes are formed.
  • a total heat exchanger that exchanges heat between the air flowing through the air supply passage and the air flowing through the exhaust passage, a first temperature sensor that detects the air temperature on the inlet side of the air supply passage, and an outlet side of the air supply passage.
  • the second temperature sensor that detects the air temperature
  • the third temperature sensor that detects the air temperature on the inlet side of the exhaust passage
  • the first temperature sensor the second temperature sensor
  • the third temperature sensor It is provided with a control device for determining that an abnormality has occurred when the temperature efficiency of the total heat exchanger calculated based on each detected air temperature is larger than the reference value.
  • the temperature efficiency of the heat exchanger becomes larger than the standard value. Therefore, according to the ventilation device according to the present disclosure, when the above temperature efficiency is larger than the reference value, it is determined that an abnormality has occurred, and the air volume is reduced due to an abnormality due to dew condensation or freezing, or a filter clogging. When an abnormality occurs, it is possible to detect that the abnormality has occurred.
  • FIG. 1 It is a top view which shows the structure of the ventilation apparatus which concerns on Embodiment 1.
  • FIG. 2 is a side schematic diagram which shows the structure of the ventilation apparatus which concerns on Embodiment 1.
  • FIG. It is a figure which shows the temperature change of the supply air and the exhaust when the outside air temperature is higher than the room temperature in the normal state of the total heat exchanger which concerns on Embodiment 1.
  • FIG. It is a figure which shows the temperature change of the supply air and the exhaust when the outside air temperature is lower than the room temperature in the normal state of the total heat exchanger which concerns on Embodiment 1.
  • FIG. 1 It is a figure which shows the temperature change of the supply air and the exhaust when the outside air temperature is higher than the room temperature in the state of dew condensation, freezing, or a decrease in air volume in the total heat exchanger according to the first embodiment. It is a figure which shows the temperature change of the air supply and the exhaust when the outside air temperature is lower than the room temperature in the state of dew condensation, freezing, or a decrease in air volume in the total heat exchanger according to the first embodiment. It is a figure which shows the change of the temperature efficiency of the total heat exchanger at the time of the occurrence of dew condensation or freezing which concerns on Embodiment 1. FIG. It is a figure which shows the change of the temperature efficiency of the total heat exchanger when the air volume drop occurs which concerns on Embodiment 1. FIG.
  • FIG. 1 It is a figure which shows the control flow which identifies the abnormality factor of the ventilation apparatus which concerns on Embodiment 1.
  • FIG. 2 is a refrigerant circuit diagram of the ventilation system which concerns on Embodiment 2.
  • FIG. It is a side schematic diagram which shows the structure of the ventilation apparatus which concerns on Embodiment 2.
  • FIG. It is a figure which shows the control flow which identifies the abnormal factor of the ventilation apparatus which concerns on Embodiment 2.
  • FIG. 1 It is a side schematic diagram which shows the structure of the modification of the ventilation apparatus which concerns on Embodiment 2.
  • FIG. 1 is a schematic top view showing the configuration of the ventilation device 1 according to the first embodiment.
  • FIG. 2 is a schematic side view showing the configuration of the ventilation device 1 according to the first embodiment.
  • the ventilation device 1 includes a casing 10, an air supply fan 11, an air supply fan motor 12, an exhaust fan 13, and an exhaust fan motor 14. It includes a heat exchanger 20, an air supply filter 41, and an exhaust filter 42. Further, the ventilation device 1 includes an outside air temperature sensor (hereinafter, also referred to as a first temperature sensor) 51, a supply air temperature sensor (hereinafter, also referred to as a second temperature sensor) 52, and an indoor air temperature sensor (hereinafter, a third temperature). It includes a 53 (also referred to as a sensor), an exhaust temperature sensor 54, and a control device 30.
  • a first temperature sensor hereinafter, also referred to as a first temperature sensor
  • a supply air temperature sensor hereinafter, also referred to as a second temperature sensor
  • an indoor air temperature sensor hereinafter, a third temperature
  • the casing 10 constitutes the outer shell of the ventilation device 1, and has an outside air port 10a for taking in outside air (OA) inside, an exhaust port 10b for discharging exhaust gas (EA) to the outside, and a return air (RA) inside. It is provided with a return air port 10c for taking in air and an air supply port 10d for supplying air supply (SA) into the room. Further, inside the casing 10, an air supply passage 10ad through which air taken in from the outside air port 10a and blown out from the air supply port 10d passes, and air taken in from the return air port 10c and blown out from the exhaust port 10b. The exhaust passage 10bc through which the air passes is formed. In the following, the return air is also referred to as indoor air.
  • the total heat exchanger 20 is made of paper, for example, and exchanges sensible heat and latent heat between the air flowing through the air supply passage 10ad and the air flowing through the exhaust passage 10bc, that is, exchanging the total heat.
  • the air supply filter 41 and the exhaust filter 42 are provided on the total heat exchanger 20, respectively, and remove dust or dirt from the total heat exchanger 20 so as not to adhere to the total heat exchanger 20.
  • the air supply filter 41 is provided at a position on the windward side of the air supply passage 10ad in the total heat exchanger 20, and the exhaust filter 42 is provided at a position on the windward side of the exhaust passage 10bc in the total heat exchanger 20. Has been done.
  • the supply air fan motor 12 operates the supply air fan 11, and the exhaust fan motor 14 operates the exhaust fan 13.
  • the supply air fan motor 12 and the exhaust fan motor 14 may be controlled by fixing the rotation speed, or may be controlled by changing the rotation speed step by step.
  • the air supply fan 11 takes in the outside air (OA) from the outside air port 10a into the air supply passage 10ad in the casing 10, exchanges the total heat with the total heat exchanger 20, and then supplies air (SA) from the air supply port 10d. It is supplied to the room, which is the space subject to air conditioning.
  • the exhaust fan 13 takes in the return air (RA) from the return air port 10c into the exhaust passage 10bc in the casing 10, exchanges the total heat with the total heat exchanger 20, and then exhausts (EA) from the exhaust port 10b to the outside. It is to be discharged to.
  • the outside air temperature sensor 51 is provided, for example, in the vicinity of the outside air port 10a of the casing 10 and detects the air temperature on the inlet side of the supply air passage 10ad, that is, the outside air temperature.
  • the supply air temperature sensor 52 is provided, for example, in the vicinity of the air supply port 10d of the casing 10 and detects the air temperature on the outlet side of the supply air passage 10ad, that is, the supply air temperature.
  • the indoor air temperature sensor 53 is provided, for example, in the vicinity of the return air port 10c of the casing 10 and detects the air temperature on the inlet side of the exhaust passage 10bc, that is, the indoor temperature.
  • the exhaust temperature sensor 54 is provided, for example, in the vicinity of the exhaust port 10b of the casing 10 and detects the air temperature on the outlet side of the exhaust passage 10bc, that is, the exhaust temperature.
  • Each of these temperature sensors is composed of, for example, a thermistor.
  • the control device 30 has a microcomputer equipped with a CPU, ROM, RAM, I / O port, and the like.
  • the control device 30 controls the operation of the entire ventilation device 1 including the supply air fan motor 12 and the exhaust fan motor 14 based on the detection signal from each temperature sensor, the operation signal from the operation unit (not shown), and the like.
  • the control device 30 may be provided in the ventilation device 1, or may be provided separately from the ventilation device 1 and may be configured to control the ventilation device 1 by communication.
  • control device 30 has a storage unit 31, an extraction unit 32, a calculation unit 33, and a comparison unit as functional blocks related to abnormality detection of the ventilation device 1, control of the air supply fan 11 and the exhaust fan 13, and identification of the abnormal location. It includes 34, a determination unit 35, a control unit 36, and a notification unit 37.
  • the storage unit 31 is configured to store data related to the temperature detected by each temperature sensor. These data are periodically acquired during the operation of the ventilator 1. Further, various data necessary for abnormality determination are stored in the storage unit 31.
  • the extraction unit 32 is configured to extract data necessary for abnormality determination from the data stored in the storage unit 31.
  • the calculation unit 33 is configured to perform necessary calculations based on the data extracted by the extraction unit 32.
  • the comparison unit 34 is configured to compare the value obtained by the calculation in the calculation unit 33 with the threshold value, or to compare the values obtained by the calculation in the calculation unit 33.
  • the determination unit 35 is configured to perform abnormality determination on the ventilation device 1 based on the comparison result in the comparison unit 34.
  • the control unit 36 controls the supply air fan 11 and the exhaust fan 13 according to each operation mode such as a dry operation and a normal ventilation operation based on the result of the determination unit 35.
  • the notification unit 37 displays a part that displays the operation mode controlled by the control unit 36, and an abnormality such as an abnormality due to dew condensation or freezing or an abnormality due to a decrease in air volume caused by filter clogging based on the result of the determination unit 35. It is composed of the part to be used and the part to be used.
  • the notification unit 37 may be provided in the control device 30, or may be provided separately from the control device 30, and may be configured by, for example, a remote PC. When it is separate from the control device 30, the notification unit 37 is configured to notify the operation mode of the ventilation device 1 and the content of an abnormality by a command from the control device 30.
  • the notification unit 37 has at least one of a display unit for visually notifying information and a voice output unit for aurally notifying information.
  • FIG. 3 is a diagram showing temperature changes of air supply and exhaust when the outside air temperature TOA in the normal state of the total heat exchanger 20 according to the first embodiment is higher than the room temperature TRA .
  • high-temperature outside air is supplied from the supply air passage 11ad and low-temperature indoor air is supplied from the exhaust passage 11bc to the total heat exchanger 20, and the total heat is exchanged between the outside air and the indoor air. .. After that, the outside air is supplied to the room as supply air whose temperature has dropped, and the indoor air is discharged to the outside as exhaust gas whose temperature has risen.
  • the normal temperature efficiency ⁇ c when the outside air temperature TOA is higher than the room temperature TRA is as follows.
  • FIG. 4 is a diagram showing temperature changes of air supply and exhaust when the outside air temperature TOA in the normal state of the total heat exchanger 20 according to the first embodiment is lower than the room temperature TRA .
  • low-temperature outside air is supplied from the supply air passage 11ad and high-temperature indoor air is supplied from the exhaust passage 11bc to the total heat exchanger 20, and the total heat is exchanged between the outside air and the indoor air. .. After that, the outside air is supplied to the room as supply air whose temperature has risen, and the indoor air is discharged to the outside as exhaust gas whose temperature has dropped.
  • the normal temperature efficiency ⁇ h when the outside air temperature TOA is lower than the room temperature TRA ( TOA ⁇ TRA ) is as follows.
  • the abnormalities of the ventilation device 1 include abnormalities due to dew condensation or freezing and abnormalities due to a decrease in air volume caused by clogging of the filter, and these abnormalities will be described in detail.
  • the total heat exchanger 20 gets wet as described above.
  • the thermal conductivity of the total heat exchanger 20 is about 0.06 [W / (mk)], which is the thermal conductivity of paper, which is a main component thereof.
  • the total heat exchanger 20 gets wet, its thermal conductivity becomes close to the thermal conductivity of water of 0.6 [W / (mk)], so that the temperature efficiency is improved, that is, the value of the temperature efficiency ⁇ is increased. It gets higher.
  • the decrease in air volume caused by clogging of the filter or the like is caused by the accumulation of dust or dirt in the air supply filter 41 and the exhaust filter 42.
  • the filter was cleaned regularly to ensure the required ventilation volume.
  • the filter is cleaned after a certain period of time, and there is no one that detects a decrease in air volume in the state of the filter.
  • the air volume on the high temperature side decreases due to clogging of the filter or the like, the air volume on the relatively low temperature side increases, so that the high temperature air easily exchanges heat with the low temperature air in the total heat exchanger 20.
  • the high temperature air approaches the low temperature air. Therefore, the temperature efficiency of the total heat exchanger 20 is improved, that is, the value of the temperature efficiency ⁇ is increased.
  • FIGS. 5 and 6 will be used to explain changes in the temperature of the supply air and the exhaust gas of the ventilation device 1 when dew condensation, freezing, or a decrease in air volume occurs.
  • FIG. 5 is a diagram showing temperature changes of air supply and exhaust when the outside air temperature TOA is higher than the room temperature TRA when the total heat exchanger 20 according to the first embodiment is in a state of dew condensation, freezing, or a decrease in air volume. be.
  • the temperature efficiency ⁇ c'at the time of abnormality when the outside air temperature TOA is higher than the room temperature TRA is as follows.
  • FIG. 6 shows supply and exhaust when the total heat exchanger 20 according to the first embodiment has an outside air temperature TOA lower than the room temperature TRA ( TOA ⁇ TRA ) when the total heat exchanger 20 is in a state of dew condensation, freezing, or a decrease in air volume. It is a figure which shows the temperature change of.
  • the temperature efficiency ⁇ h'at the time of abnormality when the outside air temperature TOA is lower than the room temperature TRA is as follows.
  • the drying operation is an operation in which either one of the air supply fan 11 and the exhaust fan 13 is stopped to dry the total heat exchanger 20.
  • the normal operation is an operation in which both the air supply fan 11 and the exhaust fan 13 are operated.
  • the change in the temperature efficiency ⁇ when the total heat exchanger 20 is dried in the drying operation and the temperature efficiency after returning to the normal operation after the drying operation is done from at least one of the changes in ⁇ .
  • FIGS. 7 and 8 the difference between the abnormality due to dew condensation or freezing and the abnormality due to the decrease in air volume will be described.
  • FIG. 7 is a diagram showing changes in the temperature efficiency ⁇ of the total heat exchanger 20 when dew condensation or freezing occurs according to the first embodiment.
  • FIG. 8 is a diagram showing changes in the temperature efficiency ⁇ of the total heat exchanger 20 when a decrease in air volume occurs according to the first embodiment.
  • both were determined to be abnormal at t1 during normal operation, then the dry operation was performed from t1 to t3, and after t3, the time (horizontal axis) when the normal operation was performed. It shows the change in temperature efficiency ⁇ (vertical axis).
  • ⁇ 1 in FIGS. 7 and 8 is the temperature efficiency when the ventilation device 1 is normal.
  • ⁇ 3 in FIGS. 7 and 8 is used to determine which of the abnormalities caused by dew condensation or freezing and the abnormalities caused by the air volume decrease caused by the clogging of the filter, etc., when the ventilation device 1 is abnormal. Temperature efficiency.
  • FIG. 9 is a diagram showing a control flow for identifying an abnormal factor of the ventilation device 1 according to the first embodiment. It is assumed that normal operation is performed at the start of the control flow shown in FIG.
  • Step S101 The control device 30 calculates the current temperature efficiency ⁇ now based on each air temperature detected by the outside air temperature sensor 51, the supply air temperature sensor 52, and the indoor air temperature sensor 53.
  • Step S102 The control device 30 determines whether or not the difference between the current temperature efficiency ⁇ now and the reference value ⁇ st is larger than 0. When the control device 30 determines that the difference between the current temperature efficiency ⁇ now and the reference value ⁇ st is larger than 0, it is determined that the difference is greater than 0, and the process proceeds to step S103. On the other hand, when the control device 30 determines that the difference between the current temperature efficiency ⁇ now and the reference value ⁇ st is 0 or less, it determines that it is normal and ends this control flow.
  • Step S103 The control device 30 stops the exhaust fan 13 and starts the drying operation. Further, the control device 30 notifies the notification unit 37 that the drying operation is being performed. Although an example of stopping the exhaust fan 13 in order to start the drying operation has been described here, the supply air fan 11 may be stopped.
  • Step S104 The control device 30 determines whether or not a certain time has elapsed after starting the drying operation. When the control device 30 determines that a certain time has elapsed after starting the drying operation, the total heat exchanger 20 is determined to be dry, and the process proceeds to step S105. On the other hand, when the control device 30 determines that a certain time has not elapsed since the start of the drying operation, it is determined that the total heat exchanger 20 is not dry, and the process of step S104 is performed again.
  • the control device 30 determines that the total heat exchanger 20 has dried after a certain period of time has elapsed after the start of the drying operation, but the present invention is not limited thereto.
  • Step S105 The control device 30 operates the exhaust fan 13 and starts normal operation. Further, the control device 30 notifies the notification unit 37 that the normal operation is being performed.
  • Step S106 The control device 30 calculates the current temperature efficiency ⁇ now based on each air temperature detected by the outside air temperature sensor 51, the supply air temperature sensor 52, and the indoor air temperature sensor 53.
  • Step S107 The control device 30 determines whether or not the difference between the current temperature efficiency ⁇ now and the reference value ⁇ st is larger than 0.
  • the control device 30 determines that the difference between the current temperature efficiency ⁇ now and the reference value ⁇ st is larger than 0
  • it is determined that the abnormality is due to the decrease in air volume and the process proceeds to step S108.
  • the control device 30 determines that the difference between the current temperature efficiency ⁇ now and the reference value ⁇ st is 0 or less, it is determined that there is no abnormality due to the decrease in air volume, and this control flow is terminated.
  • the control device 30 may notify the notification unit 37 that the abnormality is due to dew condensation or freezing.
  • Step S108 The control device 30 notifies the notification unit 37 that the abnormality is caused by the decrease in air volume.
  • the ventilation device 1 is a casing 10 in which an air supply passage 10ad through which the air blown from the air supply port 10d passes and an exhaust passage 10bc through which the air blown from the exhaust port 10b passes are formed.
  • a total heat exchanger 20 that is arranged in the casing 10 and exchanges heat between the air flowing through the air supply passage 10ad and the air flowing through the exhaust passage 10bc, and the first that detects the air temperature on the inlet side of the air supply passage 10ad.
  • the temperature sensor 51, the second temperature sensor 52 that detects the air temperature on the outlet side of the air supply passage 10ad, the third temperature sensor 53 that detects the air temperature on the inlet side of the exhaust passage 10bc, and the first temperature sensor 51. Control to determine that an abnormality has occurred when the temperature efficiency of the total heat exchanger 20 calculated based on each air temperature detected by the second temperature sensor 52 and the third temperature sensor 53 is larger than the reference value.
  • the device 30 is provided.
  • an abnormality occurs due to an abnormality due to dew condensation or freezing, or an abnormality due to a decrease in air volume caused by clogging of the filter, etc.
  • it is calculated based on each air temperature detected by the first temperature sensor 51, the second temperature sensor 52, and the third temperature sensor 53.
  • the temperature efficiency of the total heat exchanger 20 becomes larger than the reference value. Therefore, according to the ventilation device 1 according to the first embodiment, when the above temperature efficiency is larger than the reference value, it is determined that an abnormality has occurred. By doing so, when an abnormality due to dew condensation or freezing or an abnormality due to a decrease in air volume caused by clogging of the filter or the like occurs, it is possible to detect that the abnormality has occurred.
  • the ventilation device 1 includes an air supply fan 11 for flowing air through the supply air passage 10ad and an exhaust fan 13 for flowing air through the exhaust passage 10bc, and the control device 30 is an air supply fan. If it is determined that an abnormality has occurred during normal operation in which both the air supply fan 11 and the exhaust fan 13 are operated, a drying operation is performed in which one of the air supply fan 11 and the exhaust fan 13 is stopped.
  • the ventilation device 1 According to the ventilation device 1 according to the first embodiment, if it is determined that an abnormality has occurred during normal operation, a drying operation is performed in which either the supply air fan 11 or the exhaust fan 13 is stopped. Therefore, even if an abnormality occurs in the ventilation device 1 due to dew condensation or freezing, the total heat exchanger 20 can be dried.
  • the control device 30 is detected by the first temperature sensor 51, the second temperature sensor 52, and the third temperature sensor 53 after a certain period of time has elapsed from the start of the drying operation. If the temperature efficiency calculated based on each air temperature is greater than the reference value, it is determined that an abnormality has occurred due to a decrease in air volume, and if the temperature efficiency is below the reference value, an abnormality due to dew condensation or freezing has occurred. It is determined that it has occurred.
  • the ventilation device 1 According to the ventilation device 1 according to the first embodiment, if the temperature efficiency calculated after a certain period of time has elapsed from the start of the drying operation is larger than the reference value, it is determined that an abnormality due to a decrease in air volume has occurred, and the temperature efficiency is determined. If is less than or equal to the reference value, it is determined that an abnormality due to dew condensation or freezing has occurred. Therefore, it is possible to identify the cause of the abnormality, which of the abnormalities caused by dew condensation or freezing and the abnormalities caused by the decrease in air volume caused by the clogging of the filter.
  • the ventilation device 1 includes a notification unit 37, and the control device 30 notifies the notification unit 37 that the drying operation is being performed during the drying operation.
  • the notification unit 37 notifies the user that the drying operation is being performed during the drying operation, so that the user can be notified that the ventilation device 1 is in the drying operation. can.
  • the notification unit 37 when the control device 30 determines that an abnormality due to dew condensation or freezing has occurred, the notification unit 37 notifies that fact, and an abnormality occurs due to a decrease in air volume. If it is determined that the problem is observed, the notification unit 37 notifies the user to that effect.
  • the notification unit 37 notifies the user of the abnormal factor when an abnormality due to dew condensation or freezing or an abnormality due to a decrease in air volume occurs, so that the user is notified of the abnormal factor of the ventilation device 1. I can inform you.
  • Embodiment 2 Hereinafter, the second embodiment will be described, but the description thereof will be omitted for those overlapping with the first embodiment, and the same parts or the corresponding parts as those in the first embodiment will be designated by the same reference numerals.
  • FIG. 10 is a refrigerant circuit diagram of the ventilation device 1 according to the second embodiment.
  • FIG. 11 is a schematic side view showing the configuration of the ventilation device 1 according to the second embodiment.
  • the compressor 111, the flow path switching device 112, the first heat exchanger 113, the throttle device 121, and the second heat exchanger 122 are sequentially connected by piping. It is provided with a refrigerant circuit 101 through which the refrigerant circulates.
  • the ventilation device 1 can operate both the cooling operation and the heating operation by switching the flow path switching device 112. Further, the refrigerant circuit 101 is provided with a suction pressure sensor 116 and a condensation temperature sensor 153.
  • the compressor 111 sucks in the low temperature and low pressure refrigerant, compresses the sucked refrigerant, and discharges the high temperature and high pressure refrigerant.
  • the compressor 111 is composed of, for example, an inverter compressor whose capacity, which is a transmission amount per unit time, is controlled by changing the operating frequency.
  • the flow path switching device 112 is, for example, a four-way valve, and switches between cooling operation and heating operation by switching the flow direction of the refrigerant.
  • the flow path switching device 112 switches to the state shown by the solid line in FIG. 10 during the cooling operation, and the discharge side of the compressor 111 and the first heat exchanger 113 are connected to each other. Further, the flow path switching device 112 switches to the state shown by the broken line in FIG. 10 during the heating operation, and the discharge side of the compressor 111 and the second heat exchanger 122 are connected to each other.
  • the first heat exchanger 113 exchanges heat between the outside air and the refrigerant.
  • the first heat exchanger 113 functions as a condenser that dissipates the heat of the refrigerant to the outside air and condenses the refrigerant during the cooling operation. Further, the first heat exchanger 113 functions as an evaporator that evaporates the refrigerant during the heating operation and cools the outside air by the heat of vaporization at that time.
  • the throttle device 121 is, for example, an electronic expansion valve capable of adjusting the opening degree of the throttle, and by adjusting the opening degree, the pressure of the refrigerant flowing into the first heat exchanger 113 or the second heat exchanger 122 can be adjusted. Control.
  • the second heat exchanger 122 exchanges heat between the indoor air and the refrigerant.
  • the second heat exchanger 122 functions as an evaporator that evaporates the refrigerant during the cooling operation and cools the indoor air by the heat of vaporization at that time. Further, the second heat exchanger 122 functions as a condenser that dissipates the heat of the refrigerant to the indoor air and condenses the refrigerant during the heating operation.
  • the second heat exchanger 122 is arranged on the leeward side of the total heat exchanger 20 of the air supply passage 10ad.
  • the evaporation temperature or the condensation temperature is controlled. Specifically, in the summer, the evaporation temperature is lowered to lower the temperature of the supply air after passing through the second heat exchanger 122, and in the winter, the condensation temperature is raised to lower the second heat exchanger 122.
  • the suction pressure sensor 116 is provided on the suction side of the compressor 111, and detects the suction pressure for calculating the evaporation temperature during the cooling operation.
  • the evaporation temperature is a saturation temperature calculated from the suction pressure detected by the suction pressure sensor 116.
  • the condensation temperature sensor 153 is provided in the second heat exchanger 122 and detects the condensation temperature during the heating operation.
  • a temperature sensor may be provided in the first heat exchanger 113 instead of the suction pressure sensor 116.
  • a pressure sensor may be provided on the discharge side of the compressor 111 instead of the condensation temperature sensor 153.
  • FIG. 12 is a diagram showing a control flow for identifying an abnormal factor of the ventilation device 1 according to the second embodiment. It is assumed that normal operation is performed at the start of the control flow shown in FIG.
  • Step S201 The control device 30 calculates the current temperature efficiency ⁇ now based on each air temperature detected by the outside air temperature sensor 51, the supply air temperature sensor 52, and the indoor air temperature sensor 53.
  • Step S202 The control device 30 determines whether or not the difference between the current temperature efficiency ⁇ now and the reference value ⁇ st is larger than 0. When the control device 30 determines that the difference between the current temperature efficiency ⁇ now and the reference value ⁇ st is larger than 0, it is determined that the difference is greater than 0, and the process proceeds to step S203. On the other hand, when the control device 30 determines that the difference between the current temperature efficiency ⁇ now and the reference value ⁇ st is 0 or less, it determines that it is normal and ends this control flow.
  • Step S203 The control device 30 stops the exhaust fan 13 and starts the drying operation. Further, the control device 30 notifies the notification unit 37 that the drying operation is being performed. Further, the control device 30 controls the evaporation temperature or the condensation temperature according to the outside air temperature. That is, when the outside air temperature is equal to or higher than the predetermined value in the summer, the operating frequency of the compressor 111 and the opening degree of the throttle device 121 are controlled so that the evaporation temperature drops to the predetermined value or lower. Further, when the outside air temperature is equal to or less than a predetermined value in winter, the operating frequency of the compressor 111 and the opening degree of the throttle device 121 are controlled so that the condensation temperature rises to the predetermined value or more. Although an example of stopping the exhaust fan 13 in order to start the drying operation has been described here, the supply air fan 11 may be stopped.
  • Step S204 The control device 30 determines whether or not a certain time has elapsed after starting the drying operation. When the control device 30 determines that a certain time has elapsed after starting the drying operation, the total heat exchanger 20 is determined to be dry, and the process proceeds to step S205. On the other hand, when the control device 30 determines that a certain time has not elapsed since the start of the drying operation, it is determined that the total heat exchanger 20 is not dry, and the process of step S204 is performed again.
  • the control device 30 determines that the total heat exchanger 20 has dried after a certain period of time has elapsed after the start of the drying operation, but the present invention is not limited thereto.
  • Step S205 The control device 30 operates the exhaust fan 13 and starts normal operation. Further, the control device 30 notifies the notification unit 37 that the normal operation is being performed. Further, the control device 30 controls the evaporation temperature or the condensation temperature according to the outside air temperature. That is, when the outside air temperature is equal to or higher than the predetermined value in the summer, the operating frequency of the compressor 111 and the opening degree of the throttle device 121 are controlled so that the evaporation temperature drops to the predetermined value or lower. Further, when the outside air temperature is equal to or less than a predetermined value in winter, the operating frequency of the compressor 111 and the opening degree of the throttle device 121 are controlled so that the condensation temperature rises to the predetermined value or more.
  • Step S206 The control device 30 calculates the current temperature efficiency ⁇ now based on each air temperature detected by the outside air temperature sensor 51, the supply air temperature sensor 52, and the indoor air temperature sensor 53.
  • Step S207 The control device 30 determines whether or not the difference between the current temperature efficiency ⁇ now and the reference value ⁇ st is larger than 0.
  • the control device 30 determines that the difference between the current temperature efficiency ⁇ now and the reference value ⁇ st is larger than 0
  • it is determined that the abnormality is due to the decrease in air volume and the process proceeds to step S208.
  • the control device 30 determines that the difference between the current temperature efficiency ⁇ now and the reference value ⁇ st is 0 or less, it is determined that there is no abnormality due to the decrease in air volume, and this control flow is terminated.
  • the control device 30 may notify the notification unit 37 that the abnormality is due to dew condensation or freezing.
  • Step S208 The control device 30 notifies the notification unit 37 that the abnormality is caused by the decrease in air volume.
  • FIG. 13 is a schematic side view showing the configuration of a modified example of the ventilation device 1 according to the second embodiment.
  • the first heat exchanger 113 is arranged on the windward side of the total heat exchanger 20 of the air supply passage 10ad.
  • the air taken in from the outside air port 10a is heated by the heat released from the first heat exchanger 113 functioning as a condenser, that is, the heat of condensation, and then supplied to the total heat exchanger 20.
  • the first heat exchanger 113 functioning as a condenser, that is, the heat of condensation, and then supplied to the total heat exchanger 20.
  • the compressor 111, the flow path switching device 112, the first heat exchanger 113, the throttle device 121, and the second heat exchanger 122 are connected by pipes, and the refrigerant circulates.
  • a refrigerant circuit 101 is provided, the second heat exchanger 122 is arranged on the leeward side of the total heat exchanger 20 of the air supply passage 10ad, and the control device 30 is detected by the first temperature sensor 51 during the drying operation. The evaporation temperature or the condensation temperature is controlled according to the temperature.
  • the evaporation temperature or the condensation temperature is controlled according to the temperature detected by the first temperature sensor 51 during the drying operation. Therefore, even when the outside air is not totally heat exchanged with the room air by the total heat exchanger 20 and the temperature does not change, the room temperature can be kept constant by lowering or raising the temperature of the supply air.
  • the first heat exchanger 113 is arranged on the windward side of the total heat exchanger 20 of the air supply passage 10ad.
  • the first heat exchanger 113 is arranged on the wind side of the total heat exchanger 20 of the air supply passage 10ad, it is taken in from the outside air port 10a during the drying operation.
  • the generated air is heated by the heat of condensation and then supplied to the total heat exchanger 20. Therefore, the time required for drying the total heat exchanger 20 during the drying operation can be shortened.
  • Ventilation device 10 casing, 10a outside air port, 10ad air supply path, 10b exhaust port, 10bc exhaust path, 10c return air port, 10d air supply port, 11 air supply fan, 11ad air supply path, 11bc exhaust port, 12 supply Qi fan motor, 13 exhaust fan, 14 exhaust fan motor, 20 total heat exchanger, 30 control device, 31 storage unit, 32 extraction unit, 33 calculation unit, 34 comparison unit, 35 judgment unit, 36 control unit, 37 notification unit , 41 air supply filter, 42 exhaust filter, 51 outside air temperature sensor, 52 supply air temperature sensor, 53 indoor air temperature sensor, 54 exhaust temperature sensor, 101 refrigerant circuit, 111 compressor, 112 flow path switching device, 113 first heat Exchanger, 116 suction pressure sensor, 121 throttle device, 122 second heat exchanger, 153 condensate temperature sensor.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
  • Ventilation (AREA)
PCT/JP2020/039903 2020-10-23 2020-10-23 換気装置 Ceased WO2022085177A1 (ja)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024185109A1 (ja) * 2023-03-09 2024-09-12 三菱電機株式会社 換気装置及び換気システム
WO2024219839A1 (ko) * 2023-04-19 2024-10-24 삼성전자주식회사 환기 장치 및 이를 포함하는 공기 조화 장치
WO2024236641A1 (ja) * 2023-05-12 2024-11-21 三菱電機株式会社 換気装置及び換気システム

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011163576A (ja) * 2010-02-04 2011-08-25 Toenec Corp 空気調和システムにおける全熱交換器及び周辺設備の異常検知装置
US20140260362A1 (en) * 2013-03-14 2014-09-18 In Sook JUNG Heat exchanger, heat recovery ventilator including the same, and method for defrosting and checking operations thereof
WO2017037816A1 (ja) * 2015-08-31 2017-03-09 三菱電機株式会社 換気装置
WO2019082531A1 (ja) * 2017-10-24 2019-05-02 三菱電機株式会社 換気装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011163576A (ja) * 2010-02-04 2011-08-25 Toenec Corp 空気調和システムにおける全熱交換器及び周辺設備の異常検知装置
US20140260362A1 (en) * 2013-03-14 2014-09-18 In Sook JUNG Heat exchanger, heat recovery ventilator including the same, and method for defrosting and checking operations thereof
WO2017037816A1 (ja) * 2015-08-31 2017-03-09 三菱電機株式会社 換気装置
WO2019082531A1 (ja) * 2017-10-24 2019-05-02 三菱電機株式会社 換気装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024185109A1 (ja) * 2023-03-09 2024-09-12 三菱電機株式会社 換気装置及び換気システム
WO2024219839A1 (ko) * 2023-04-19 2024-10-24 삼성전자주식회사 환기 장치 및 이를 포함하는 공기 조화 장치
WO2024236641A1 (ja) * 2023-05-12 2024-11-21 三菱電機株式会社 換気装置及び換気システム

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