JP2009250451A - Total enthalpy heat exchange ventilation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a total enthalpy heat exchange ventilation device for automatically switching a heat exchange ventilating operation and a normal ventilating operation without measuring or detecting the outside air temperature. <P>SOLUTION: In this total enthalpy heat exchange ventilation device 70 in which a total enthalpy heat exchanging element 15 is disposed on the way of an outside-air air trunk OF, an air trunk switching section 40 is disposed on the way of an indoor-air air trunk IF, and a motion of the air trunk switching section is controlled by an operation-control section 50 on the basis of the outside air temperature and a temperature of the indoor air, a first indoor-side temperature sensor 43 is disposed near a supply opening 20b of the outside-air air trunk, a second indoor-side temperature sensor 45 is disposed near a suction opening 25a of the indoor-air air trunk, the operation-control section calculates the outside air temperature on the basis of results of the detections of the first and second indoor-side temperature sensors and heat exchange efficiency in the total enthalpy heat exchanging element, and the operation-control section controls the motion of the air trunk switching section on the basis of a result of the calculation, a result of the detection of the first indoor-side temperature sensor, and a result of the detection of the second indoor-side temperature sensor. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a total heat exchange ventilator using a total heat exchange element that performs both exchange of latent heat and sensible heat, and more specifically, a heat exchange ventilation operation that performs heat exchange using the total heat exchange element, The present invention relates to a total heat exchange ventilator capable of automatically switching between normal ventilation operation without heat exchange by a heat exchange element and performing air conditioning.

  Today, the heat exchange ventilation operation that ventilates while exchanging heat between the outside air and the room air by the total heat exchange element and the normal ventilation operation that ventilates without performing the heat exchange by the total heat exchange element are automatically performed. Total heat exchange ventilators have been developed that perform air conditioning by switching.

  In this type of total heat exchange ventilator, an outside air air passage that takes in outside air and blows it out into the room and an indoor air air passage that takes in indoor air and blows it out outside the room are formed in the housing. An air path switching unit that switches the indoor air air path into two air paths, that is, a heat exchange air path through which the room air passes through the total heat exchange element and a bypass air path through which the room air bypasses the total heat exchange element is disposed. The At the time of heat exchange ventilation, the outside air passage and the heat exchange air passage are formed in the housing, and the outside air passage and the bypass air passage are formed in the housing for the normal ventilation. The total heat exchange element is disposed in advance at a location where the outdoor air passage and the heat exchange air passage intersect. In addition, in order to determine whether to perform heat exchange ventilation operation or normal ventilation operation, an outdoor temperature sensor is provided in the vicinity of the intake port in the outside air air passage, and in the vicinity of the intake port in the indoor air air passage. An indoor temperature sensor is provided.

  The total heat exchange ventilator uses an arithmetic and control unit to determine whether it is appropriate to perform heat exchange ventilation or normal ventilation based on the detection results of the outdoor temperature sensor and the indoor temperature sensor. The calculation / control unit controls the operation of the air path switching unit based on its own determination result, and automatically switches between the heat exchange ventilation operation and the normal ventilation operation. However, when the outdoor temperature sensor fails, it is impossible to determine whether the temperature of the outside air is suitable for the outside air cooling. Therefore, the normal ventilation is stopped until the failure of the outdoor temperature sensor is corrected.

  Although it does not perform air conditioning in a room where a human lives, the control method of the supply air heat exchange device described in Patent Document 1 uses sensible heat exchange and direct intake of outside air in the box containing the heating element. When a plurality of supply air heat exchangers to be cooled are installed in one box and there is an intake air heat exchange device in which the outside air temperature sensor has failed, the measurement result of the outside air temperature sensor of another supply air exchange device is used. A supply air heat exchanger in which a failure has occurred in the outside air temperature sensor is controlled.

JP 2003-294287 A

  In the conventional total heat exchange ventilator that automatically switches between the heat exchange ventilation operation and the normal ventilation operation, as described above, when the outdoor temperature sensor fails, the normal ventilation operation is stopped until the failure is corrected. Therefore, the outside air cannot be cooled until the failure is corrected, and the convenience is reduced. If there is a premise that a plurality of total heat exchange ventilators are used, the heat in the total heat exchange ventilator in which the outdoor temperature sensor has failed in accordance with the control method of the charge air heat exchange device described in Patent Document 1. Although it is possible to automatically switch between the exchange ventilation operation and the normal ventilation operation using the measurement result of the outdoor temperature sensor in another total heat exchange ventilator, the total heat exchange ventilator should be used alone. There are many.

  The present invention has been made in view of the above circumstances, and provides a total heat exchange ventilator that can automatically switch between heat exchange ventilation operation and normal ventilation operation even if the temperature of the outside air cannot be measured or detected. For the purpose.

  The total heat exchange ventilator of the present invention that achieves the above-mentioned object is provided with an indoor air wind path in which a total heat exchange element is arranged in the middle of an outside air path that takes in outside air and blows it out into the room, and also takes in indoor air and blows it out to the outside. An air path switching unit is arranged in the middle, and the operation of the air path switching unit is controlled by the calculation / control unit based on the temperature of the outside air and the temperature of the room air, so that the indoor air passes through the total heat exchange element. A total heat exchange ventilator that switches an indoor air air path to an air path and a bypass air path that bypasses the total heat exchange element, the first indoor side temperature sensor provided in the vicinity of the outlet in the outdoor air path, A second indoor side temperature sensor provided in the vicinity of the air inlet in the indoor air air passage, and the calculation / control unit detects the total heat and the detection results of each of the first indoor side temperature sensor and the second indoor side temperature sensor. The heat exchange efficiency in the exchange element and the outside air The temperature is calculated, and the operation of the air path switching unit is controlled based on the calculation result, the detection result of the first indoor side temperature sensor, and the detection result of the second indoor side temperature sensor. is there.

  In the total heat exchange ventilator of the present invention, the calculation / control unit uses the detection results of the first indoor side temperature sensor and the second indoor side temperature sensor and the heat exchange efficiency of the total heat exchange element to control the temperature of the outside air. Since the operation of the air path switching unit is controlled based on the calculation result, the detection result of the first indoor side temperature sensor, and the detection result of the second indoor side temperature sensor, the temperature of the outside air is measured or detected Even if it is not possible, the heat exchange ventilation operation and the normal ventilation operation can be automatically switched. Since it is not an essential requirement to provide a temperature sensor in the vicinity of the inlet of the outdoor air passage that is exposed to a more severe environment than indoors, according to the present invention, the heat exchange ventilation operation and the normal ventilation operation are automatically switched. It becomes easy to improve the reliability and durability of the total heat exchange ventilator.

  Hereinafter, embodiments of the total heat exchange ventilation apparatus of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to the following embodiment.

  FIG. 1-1 is a partial longitudinal sectional view schematically showing a state at the time of heat exchange ventilation in an example of the total heat exchange ventilation apparatus of the present invention, and FIG. It is a fragmentary longitudinal cross-sectional view which shows the mode at the time of the normal ventilation in a heat exchange ventilator roughly. FIGS. 2-1 to 2-4 are enlarged views schematically showing command input units included in the total heat exchange ventilator shown in FIG. 1-1.

  A total heat exchange ventilator 70 shown in FIGS. 1-1 and 1-2 includes a housing 10, a total heat exchange element 15 disposed in the center of the housing 10, and outside air attached to the housing 10. A suction port 20a, an outside air outlet 20b, an indoor air inlet 25a, and an indoor air outlet 25b are provided. In addition, an air supply fan 30, an exhaust fan 35, an air path switching unit 40, a first indoor side temperature sensor 43, a second indoor side temperature sensor 45, and an outdoor temperature sensor 47 disposed in the housing 10, A calculation / control unit 50 that controls the operation of the path switching unit 40 and a command input unit 60 that functions as an input device of the calculation / control unit 50 are also provided.

  The housing 10 is provided with two horizontal partition walls 3a and 3b and one vertical partition wall 5, and these three partition walls 3a, 3b and 5 are separated from each other at the central portion in the housing 10. Yes. A total heat exchange element 15 is arranged at a location where the three partition walls 3a, 3b, 5 are separated from each other. As the total heat exchange element 15, for example, a paper partition member having a sheet shape and a paper spacing member having a corrugated shape are alternately stacked, and a space between the partition member and the spacing member below the partition member. And a plurality of air flow paths formed between the partition member and the spacing member on the partition member. Each flow path formed below the partition member and each flow path formed above the partition member are substantially perpendicular to each other when viewed in plan, and air flows down each flow path formed below the partition member And exchange of sensible heat and latent heat through the partition member between the air and the air flowing down each flow path formed on the partition member.

  An outside air inlet 20a attached to the housing 10 communicates with a space below the horizontal partition 3a in the housing 10, and an outside air outlet 20b is a space above the horizontal partition 3b in the housing 10. Communicating with The indoor air inlet 25a communicates with the space below the horizontal partition 3b in the housing 10, and the indoor air outlet 25b communicates with the space above the horizontal partition 3a in the housing 10. Yes.

The air supply fan 30 is disposed above the horizontal partition 3 b in the housing 10. By driving the air supply fan 30, an outside air passage OF that takes in outside air and blows it out into the room is formed in the total heat exchange ventilator 70. The outside air suction port 20a functions as a suction port in the outside air air path OF, and the outside air blowing port 20b functions as a blowing port in the outside air air path OF. The outside air taken into the total heat exchange ventilator 70 from the outside air inlet 20a is blown out into the room through the total heat exchange element 15, the air supply fan 30, and the outside air outlet 20b. In Figure 1-1 and Figure 1-2 illustrates the external air flow at ambient air passage OF by a two-dot chain line CL _1.

  The exhaust fan 35 is disposed above the horizontal partition wall 30 a in the housing 10. By driving the exhaust fan 35, an indoor air air path IF that takes in indoor air and blows it out of the room is formed in the total heat exchange ventilator 70. The indoor air suction port 25a functions as a suction port in the indoor air air path IF, and the indoor air blowing port 25b functions as a blowing port in the indoor air air path IF. The indoor air taken into the total heat exchanging ventilator 70 from the indoor air suction port 25a is blown out through the exhaust fan 35 and the indoor air outlet 25b. In the indoor air air path IF, the air path switching unit 40 causes the room air to bypass the total heat exchange element 15 and the heat exchange air path TF (see FIG. 1-1) through which the room air passes through the total heat exchange element 15. It is switched to the bypass air passage BF (see FIG. 1-2).

For example, a damper is used as the air path switching unit 40, and the air path switching unit 40 is disposed in the vicinity of the end surface of the total heat exchange element 15 on the indoor air suction port 25 a side. When the air path switching unit 40 is open, that is, as shown in FIG. 1A, when the air path switching unit 40 does not cover the end surface of the indoor air suction side 25a in the total heat exchange element 15, the indoor air air path IF becomes the heat exchange air passage TF. The indoor air is taken into the total heat exchange ventilator 70 from the indoor air suction port 25a, reaches the exhaust fan 35 via the total heat exchange element 15, and blows out to the outside through the exhaust fan 35 and the indoor air outlet 25b. Is done. In Figure 1-1 shows the flow of the room air in the heat exchange air path TF by a two-dot chain line CL _2.

On the other hand, when the air path switching unit 40 is closed, that is, when the air path switching unit 40 covers the end surface on the indoor air suction port 25a side of the total heat exchange element 15 as shown in FIG. The air path IF becomes the bypass air path BF. The indoor air is taken into the total heat exchange ventilator 70 from the indoor air suction port 25a, and the indoor air bypasses the total heat exchange element 15 and reaches the exhaust fan 35, and blows out to the outside through the exhaust fan 35 and the indoor air outlet 25b. Is done. When the air path switching unit 40 is closed, a ventilation path (not shown) that connects the space below the partition wall 3b and the space above the partition wall 3a is formed in the side portion of the housing 10. In Figure 1-2 shows the flow of the indoor air in the bypass air passage BF by a two-dot chain line CL _3.

  The first indoor side temperature sensor 43 is disposed in a region on the outside air outlet 20 b side in the housing 10 and detects the temperature of the outside air that has flowed down the total heat exchange element 15. Further, the second indoor side temperature sensor 45 is arranged in a region on the indoor air suction port 25a side in the housing 10 and detects the temperature of the indoor air flowing into the housing 10 from the indoor air suction port 25a. . The outdoor temperature sensor 47 is arranged in a region on the outside air suction port 20a side in the housing 10 and detects the temperature of the outside air flowing into the housing 10 from the outside air suction port 20a. Each of the first indoor side temperature sensor 43, the second indoor side temperature sensor 45, and the outdoor side temperature sensor 47 is configured using a thermistor, and the detection results of the temperature sensors 43, 45, 47 are calculated and controlled by the calculation / control unit 50. For example, periodically.

  The calculation / control unit 50 determines whether each of the first indoor side temperature sensor 43, the second indoor side temperature sensor 45, and the outdoor temperature sensor 47 is normal, and these temperature sensors 43, 45 47, the operation of the air path switching unit 40 is controlled based on the respective detection results. Further, the start and stop of the air supply fan 30 and the exhaust fan 35 are controlled in accordance with a command input by the user through the command input unit 60. The command input unit 60 is wired or wirelessly connected to the calculation / control unit 50 and functions as an input device for the calculation / control unit 50.

  As shown in FIGS. 2-1 to 2-4, the command input unit 60 is an operation / stop command button 51 for inputting a command related to operation and stop of the total heat exchange ventilator 70, and operation of the total heat exchange ventilator 70. An operation state display lamp 53 for displaying the state and a ventilation mode designation button 55 for inputting a command relating to selection and designation of the ventilation mode in the total heat exchange ventilation device 70 are provided. Further, a heat exchange efficiency designation button 57 for inputting a command relating to heat exchange efficiency in the total heat exchange ventilator 70, a designated value of the ventilation mode and heat exchange efficiency of the total heat exchange ventilator 70, a message when an abnormality occurs, etc. Is also provided.

  By pressing the operation / stop command button 51, the user operates and stops the total heat exchange ventilation device 70, that is, the supply fan 30 and the exhaust fan 35 (see FIGS. 1-1 and 1-2), respectively. A start command and a stop command can be input. While the total heat exchange ventilator 70 is in operation, the operation state display lamp 53 is lit. When the total heat exchange ventilator 70 is stopped, the operation state display lamp 53 is extinguished and the total heat exchange ventilator 70 has an abnormality such as a sensor abnormality. When this occurs, the operation state display lamp 53 blinks.

  Further, the user can select and designate the ventilation mode in the total heat exchange ventilation device 70 from the automatic switching mode, the heat exchange ventilation mode, and the normal ventilation mode by pressing the ventilation mode designation button 55. . At this time, each mode name is displayed on the display 59 and a pointer for mode selection is displayed on the display 59. Further, a symbol of the mode pointed to by the pointer (a graphic symbolizing the flow of air around the total heat exchange element) is displayed on the display 59. Under the above automatic switching mode, heat exchange ventilation operation and normal ventilation operation are automatically switched, only heat exchange ventilation operation is performed under heat exchange ventilation mode, and only normal ventilation operation is performed under normal ventilation mode. . FIG. 2-1 schematically shows the command input unit 60 when the automatic switching mode is designated, and FIG. 2-2 schematically shows the command input unit 60 when the heat exchange ventilation mode is designated. 3 schematically shows the command input unit 60 when the normal ventilation mode is designated.

  In addition, when a sensor abnormality occurs in the total heat exchange ventilator 70, it becomes impossible to designate the automatic switching mode. Therefore, as shown in FIG. 2-4, a mode called “automatic switching” displayed on the display 59 The name is marked with a strikethrough. In addition, a message indicating that a sensor abnormality has occurred is displayed on the display 59. The heat exchange efficiency designation button 57 is used when the user designates the heat exchange efficiency in the total heat exchange element 15 and eventually the heat exchange efficiency in the total heat exchange ventilator 70.

  The total heat exchanging ventilator 60 having the above-described configuration is characterized by the operation control of the air path switching unit 40 by the calculation / control unit 50. Therefore, the operation control performed by the calculation / control unit 50 will be described below. The reference numerals used in FIG. 1-1 or FIGS. 2-1 to 2-4 will be described in detail with reference to FIGS.

  FIG. 3 schematically illustrates an example of operation control performed by the calculation / control unit from the start of operation of the total heat exchange ventilator illustrated in FIGS. 1-1 and 1-2 to the end of operation. It is a flowchart to show. In the example shown in the figure, the calculation / control unit 50 starts from step S1 to step S6, step S10, after the total heat exchange ventilator 70 (see FIG. 1-1) starts operation and ends operation. And step S40 is suitably performed.

  In step S1 performed first, based on the temperature detected by the second indoor side temperature sensor 45 (see FIG. 1-1), the electric resistance value of the thermistor constituting the second indoor side temperature sensor 45 is the total heat. The calculation / control unit 50 determines whether or not it is within the range specified by the manufacturer of the exchange ventilation device 70. When it is determined that the electrical resistance value is within the specified range, that is, normal, the process proceeds to step S2.

  In step S2, the electrical resistance value of the thermistor constituting the outdoor temperature sensor 47 is designated by the manufacturer of the total heat exchange ventilator 70 based on the temperature detected by the outdoor temperature sensor 47 (see FIG. 1-1). The calculation / control unit 50 determines whether or not it is within the range. When it is determined that the electrical resistance value is within the specified range, that is, normal, the process proceeds to step S10 described later. When it is determined that the electrical resistance value is not within the specified range, that is, a failure is detected, the process proceeds to step S3.

  In step S3, based on the temperature detected by the first indoor side temperature sensor 43 (see FIG. 1-1), the electrical resistance value of the thermistor constituting the first indoor side temperature sensor 43 is changed to the total heat exchange ventilator 70. The calculation / control unit 50 determines whether or not it is within the specified range of the manufacturer. When it is determined that the electrical resistance value is within the specified range, that is, normal, the process proceeds to step S40 described later. When it is determined that the electrical resistance value is not within the specified range, that is, it is determined that a failure has occurred, the process proceeds to step S4. A message indicating that a sensor abnormality has occurred is displayed on the display 59 (see FIG. 2-4) of the command input unit 60.

  If a sensor abnormality occurs, the total heat exchanging ventilator 70 can be operated only in one of the heat exchanging ventilation mode and the normal ventilation mode, and the user designates either mode. Thereby, it progresses to step S5 which operates by single ventilation mode. Thereafter, the process proceeds to step S6 in which the calculation / control unit 50 determines whether or not a command for instructing the end (stop) of the operation of the total heat exchange ventilator 70 is input from the command input unit 60. When it is determined in step S6 that the command to end the operation is not input, the process returns to step S1 to repeat step S1 and the subsequent steps, and when it is determined that the command to end the operation is input, the air supply fan 30 and the exhaust fan 35 are stopped to end the operation.

  On the other hand, when it is determined in step S2 that the electrical resistance value of the thermistor of the outdoor temperature sensor 47 is within the specified range and the process proceeds to step S10, that is, steps S1 and S2 are performed, and the second indoor temperature sensor 45 is executed. When it is determined that both the outdoor temperature sensor 47 and the outdoor temperature sensor 47 are normal, the calculation / control unit 50 executes the first automatic ventilation algorithm. In the first automatic ventilation algorithm, the calculation / control unit 50 operates the air path switching unit 40 (see FIG. 1-1) using the detection results of the two temperature sensors 45 and 47 determined to be normal. Control to automatically switch between heat exchange ventilation operation and normal ventilation operation.

  When it is determined in step S3 that the electrical resistance value of the thermistor of the first indoor side temperature sensor 43 is within the specified range, the process proceeds to step S40, that is, steps S1 to S3 are performed to perform the outdoor temperature sensor 47. If the second indoor side temperature sensor 45 and the first indoor side temperature sensor 43 are determined to be normal, the calculation / control unit 50 executes the second automatic ventilation algorithm. In the second automatic ventilation algorithm, the calculation / control unit 50 switches the air path using the detection results of the two temperature sensors 43 and 45 determined to be normal and the heat exchange efficiency of the total heat exchange element 15. The operation of the unit 40 is controlled to automatically switch between the heat exchange ventilation operation and the normal ventilation operation.

  FIG. 4 is a flowchart schematically showing an example of operation control performed by the calculation / control unit in the first automatic ventilation algorithm described above. In the example shown in the figure, the calculation / control unit 50 (see FIG. 1-1) performs a predetermined step of steps S11 to S30 to automatically switch between the heat exchange ventilation operation and the normal ventilation operation.

  In step S11 performed first, the calculation / control unit 50 controls the operations of the air supply fan 30, the exhaust fan 35, and the air path switching unit 40, and the total heat exchange ventilator 70 (see FIG. 1-1). Ventilation operation set in advance by the manufacturer, that is, one of heat exchange ventilation operation and normal ventilation operation is started. However, when the first automatic ventilation algorithm is executed, the process proceeds to step S6 shown in FIG. 3 and then the first automatic ventilation algorithm is executed again without ending the operation. The ventilation operation finally performed is started in step S11.

  In step S12, the calculation / control unit 50 sets the first timer to a predetermined time. The time set in the first timer is the maximum time interval until the operation of determining whether to switch between the heat exchange ventilation operation and the normal ventilation operation or not, and depends on the manufacturer of the total heat exchange ventilation device 70. It is set in advance. The first timer is provided in advance in the arithmetic / control unit 50, for example.

  In step S13, the calculation / control unit 50 determines whether or not the current ventilation operation of the total heat exchange ventilation device 70 is the heat exchange ventilation operation. When it is determined that the operation is a heat exchange ventilation operation, the process proceeds to step S14, and when it is determined that the operation is not a heat exchange ventilation operation, that is, a normal ventilation operation, the process proceeds to step S20. Hereinafter, Steps S20 to S30 will be described after Steps S14 to S19 are described.

  In step S14, whether or not the detected temperature Tx of the outdoor temperature sensor 47 (see FIG. 1-1) is equal to or higher than the condition value Ta is detected within a predetermined time, that is, within the time set in the first timer. The calculation / control unit 50 determines whether or not. The condition value Ta is the lowest temperature of the outside air that is considered appropriate for the outside air cooling, and is set by the manufacturer of the total heat exchange ventilator 70 and stored in advance in a storage unit (not shown). The storage unit is provided in the calculation / control unit 50, for example. While executing the first automatic ventilation algorithm, the calculation / control unit 50 compares the detected temperature Tx with the condition value Ta every time the outdoor temperature sensor 47 transmits the detected temperature Tx.

  When it is determined in step S14 that the detected temperature Tx is equal to or higher than the condition value Ta, the process proceeds to step S15. When it is determined that the detected temperature Tx is not detected within the time, the process proceeds to step S17.

  In step S15, the calculation / control unit 50 determines whether or not the detected temperature Ty of the second indoor side temperature sensor 45 (see FIG. 1-1) is equal to or higher than the condition value Tb. The condition value Tb is the minimum temperature of the indoor air that is considered appropriate for the outside air cooling, and the condition value Tb is lower than the aforementioned condition value Ta. The condition value Tb is set by the manufacturer of the total heat exchange ventilator 70 and is stored in advance in a storage unit (not shown). The storage unit is provided in the calculation / control unit 50, for example. While executing the first automatic ventilation algorithm, the calculation / control unit 50 compares the detected temperature Ty with the condition value Tb each time the second indoor temperature sensor 45 transmits the detected temperature Ty. .

  When it is determined in step S15 that the detected temperature Ty is not equal to or higher than the condition value Tb, that is, lower than the condition value Tb, the process proceeds to step S6 shown in FIG. 3, and it is determined that the detected temperature Ty is equal to or higher than the condition value Tb. Sometimes the routine proceeds to step S16, where the calculation / control unit 50 determines whether or not the difference between the detected temperature Tx of the outdoor temperature sensor 47 and the detected temperature Ty of the second indoor temperature sensor 45 is larger than the condition value ΔTβ. . The above condition value ΔTβ is the minimum temperature difference between the outside air and the room air that is considered appropriate for the outside air cooling, and is set by the manufacturer of the total heat exchange ventilator 70 and is a storage unit (not shown). Stored in advance. The storage unit is provided in the calculation / control unit 50, for example.

  When it is determined in step S16 that the difference between the detected temperature Tx and the detected temperature Ty is not greater than the condition value ΔTβ, that is, less than or equal to the condition value ΔTβ, the process proceeds to step S6 shown in FIG. 3, and is greater than the condition value ΔTβ. When it is determined that the calculation / control unit 50 controls the operation of the air path switching unit 40 and switches the operation of the total heat exchange ventilation device 70 from the heat exchange ventilation operation to the normal ventilation operation, The process proceeds to step S6 shown in FIG.

  When it is determined in step S14 that the detected temperature Tx is not equal to or higher than the condition value Ta within the predetermined time and the process proceeds to step S17, the detected temperature Ty of the second indoor temperature sensor 45 is the same as that described above. In step S17, the calculation / control unit 50 determines whether the condition value Tb is equal to or greater than the condition value Tb.

  When it is determined in step S17 that the detected temperature Ty is not equal to or higher than the condition value Tb, that is, lower than the condition value Tb, the process proceeds to step S6 shown in FIG. 3, and it is determined that the detected temperature Ty is equal to or higher than the condition value Tb. Sometimes the process proceeds to step S18.

  In step S18, whether or not the difference between the detected temperature Tx of the outdoor temperature sensor 47 and the detected temperature Ty of the second indoor temperature sensor 45 is in a range larger than the condition value ΔTα and smaller than the condition value ΔTβ. The calculation / control unit 50 determines whether or not. The condition value ΔTα is the minimum temperature difference between the outside air and the room air that is considered appropriate for normal ventilation, and is smaller than the condition value ΔTβ. The condition value ΔTα is set by the manufacturer of the total heat exchange ventilator 70 and stored in advance in a storage unit (not shown). The storage unit is provided in the calculation / control unit 50, for example.

  When it is determined in step S18 that the difference between the detected temperature Tx and the detected temperature Ty is not in the range larger than the condition value ΔTα and smaller than the condition value ΔTβ, the process proceeds to step S6 shown in FIG. When it is determined that the total heat exchange ventilation device 70 is operated, the calculation / control unit 50 switches the operation of the total heat exchange ventilation device 70 from the heat exchange ventilation operation to the normal ventilation operation, and then the steps shown in FIG. Proceed to S6.

  On the other hand, when it is determined in step S13 described above that the current ventilation operation of the total heat exchange ventilation apparatus 70 is not the heat exchange ventilation operation, that is, the normal ventilation operation, and the process proceeds to step S20, the outdoor temperature sensor 47 detects. In step S20, the calculation / control unit 50 determines whether or not the temperature Tx is detected to be equal to or higher than the above-described condition value Ta within a predetermined time, that is, within the time set in the first timer. When it is determined in step S20 that the detected temperature Tx is equal to or higher than the condition value Ta, the process proceeds to step S21. When it is determined that the detected temperature Tx is not detected within the time, the process proceeds to step S25.

  In step S21, the calculation / control unit 50 determines whether or not the detected temperature Tx of the outdoor temperature sensor 47 is equal to or higher than the detected temperature Ty of the second indoor temperature sensor 45. When it is determined that the detected temperature Tx is equal to or higher than the detected temperature Ty, the process proceeds to step S30, where the calculation / control unit 50 controls the operation of the air path switching unit 40, and the operation of the total heat exchange ventilator 70 starts from the normal ventilation operation. Switch to heat exchange ventilation.

  When it is determined in step S21 that the detected temperature Tx is not equal to or higher than the detected temperature Ty, that is, lower than the detected temperature Ty, the process proceeds to step S22, where the detected temperature Ty of the second indoor side temperature sensor 45 is equal to or less than the condition value Tc. The calculation / control unit 50 determines whether or not. The above condition value Tc is the minimum temperature of indoor air that is considered appropriate for heat exchange ventilation. This condition value Tc is lower than the above-described condition value Tb and larger than the above-described condition value ΔTβ, and is set by the manufacturer of the total heat exchange ventilator 70 and stored in advance in a storage unit (not shown). The The storage unit is provided in the calculation / control unit 50, for example.

  When it is determined in step S22 that the detected temperature Ty is equal to or lower than the condition value Tc, the process proceeds to step S30, and the calculation / control unit 50 switches the operation of the total heat exchange ventilation device 70 from the normal ventilation operation to the heat exchange ventilation operation. When it is determined that the temperature is not less than or equal to the condition value Tc, that is, the temperature is higher than the condition value Tc, the process proceeds to step S23, and the calculation / control unit 50 determines whether or not a predetermined time has elapsed since the start of the normal ventilation operation. . The calculation / control unit 50 has a second timer for measuring the time. The length of time measured by the second timer is set by the manufacturer of the total heat exchange ventilator 70 and stored in advance in a storage unit (not shown). The storage unit is provided in the calculation / control unit 50, for example.

  When it is determined in step S23 that the predetermined time has not yet elapsed from the start of the normal ventilation operation, the process proceeds to step S6 shown in FIG. 3, and when it is determined that the predetermined time has elapsed, the process proceeds to step S24. The calculation / control unit 50 determines whether or not the detected temperature Ty of the indoor temperature sensor 45 is less than the condition value Tb described above. When it is determined that it is not less than the condition value Tb, that is, when it is greater than or equal to the condition value Tb, the process proceeds to step S6 shown in FIG. 3, and when it is determined that the condition value is less than the condition value Tb, the process proceeds to step S30. Controls the operation of the air path switching unit 40 and switches the operation of the total heat exchange ventilation device 70 from the normal ventilation operation to the heat exchange ventilation operation.

  On the other hand, when it is determined in step S20 that the detected temperature Tx described above is not detected within the predetermined time in step S20, the process proceeds to step S25, where the detected temperature Tx of the outdoor temperature sensor 47 is the second indoor side. The calculation / control unit 50 determines whether or not the temperature is detected by the temperature sensor 45. When it is determined that the detected temperature Tx is equal to or higher than the detected temperature Ty, the process proceeds to step S30, and the calculation / control unit 50 switches the operation of the total heat exchange ventilator 70 from the normal ventilation operation to the heat exchange ventilation operation. When it is determined that the detected temperature is not equal to or higher than the detected temperature Ty, that is, lower than the detected temperature Ty, the process proceeds to step S26 to calculate whether or not the detected temperature Ty of the second indoor side temperature sensor 45 is equal to or lower than the aforementioned condition value Tc. -The control part 50 judges.

  When it is determined in step S26 that the detected temperature Ty is equal to or lower than the condition value Tc, the process proceeds to step S30, and the calculation / control unit 50 switches the operation of the total heat exchange ventilation device 70 from the normal ventilation operation to the heat exchange ventilation operation. When it is determined that the temperature is not less than or equal to the condition value Tc, that is, the temperature is higher than the condition value Tc, the process proceeds to step S27, and the calculation / control unit 50 determines whether or not a predetermined time has elapsed since the start of the normal ventilation operation. . The predetermined time is the same as the “predetermined time” in step S23 described above, and is measured by the second timer. The length of time measured by the second timer is set by the manufacturer of the total heat exchange ventilator 70 and is stored in advance in a storage unit (not shown). The storage unit is provided in the calculation / control unit 50, for example.

  When it is determined in step S27 that the predetermined time has not yet elapsed from the start of the normal ventilation operation, the process proceeds to step S6 shown in FIG. 3, and when it is determined that the predetermined time has elapsed, the process proceeds to step S28. The calculation / control unit 50 determines whether or not the detected temperature Ty of the indoor temperature sensor 45 is less than the condition value Tb described above. When it is determined that it is not less than the condition value Tb, that is, it is greater than or equal to the condition value Tb, the process proceeds to step S6 shown in FIG. 3, and when it is determined that it is less than the condition value Tb, the process proceeds to step S29.

  In step S29, the calculation / control unit 50 determines whether or not the difference between the detected temperature Tx of the outdoor temperature sensor 47 and the detected temperature Ty of the second indoor temperature sensor 45 is larger than the aforementioned condition value ΔTβ. When it is determined that the difference between the detected temperature Tx and the detected temperature Ty is not greater than the condition value ΔTβ, that is, is less than or equal to the condition value ΔTβ, the process proceeds to step S6 shown in FIG. 3, and is determined to be greater than the condition value ΔTβ. If so, the process proceeds to step S30, where the calculation / control unit 50 switches the operation of the total heat exchange ventilation device 70 from the heat exchange ventilation operation to the normal ventilation operation, and then proceeds to step S6 shown in FIG.

  As described above, in the first automatic ventilation algorithm, the calculation / control unit 50 uses the detected temperatures of the second indoor side temperature sensor 45 and the outdoor temperature sensor 47 determined to be normal, and the air path switching unit 40 is controlled, and the operation of the total heat exchange ventilation device 70 is automatically switched between the heat exchange ventilation operation and the normal ventilation operation.

  FIG. 5 is a flowchart schematically showing an example of operation control in the second automatic ventilation algorithm executed by the calculation / control unit in step S40 shown in FIG. In the example shown in the figure, the calculation / control unit 50 (see FIG. 1-1) automatically performs the heat exchange ventilation operation and the normal ventilation operation by performing a predetermined step of steps S11 to S30 and steps S41 to S43. Switch. Steps S41 to S43 are unique to the illustrated example. Steps S11 to S30 are the same as steps S11 to S30 shown in FIG.

  Each of the above steps S41 to S43 is performed between step S11 and step S12. In step S41, the calculation / control unit 50 determines whether or not the current ventilation operation of the total heat exchange ventilation device 70 is the heat exchange ventilation operation. When it is determined that the operation is the heat exchange ventilation operation, the process proceeds to step S42, and when it is determined that the operation is not the heat exchange ventilation operation, that is, the normal ventilation operation, the process proceeds to step S43.

In step S42, the outdoor temperature sensor determined to be in failure in step S2 (see FIG. 3) using the detection result of the first indoor temperature sensor 43 (see FIG. 1-1) as one of the variables. The calculation / control unit 50 calculates the detected temperature Tx when 47 (see FIG. 1-1) is normal, that is, the temperature of the outside air. Specifically, the detection temperature Tz of the first indoor side temperature sensor 43, the detection temperature Ty of the second indoor side temperature sensor 45 (see FIG. 1-1), and the heat exchange efficiency in the total heat exchange element 15 are compared. The detected temperature Tx is calculated by the following equation (i) using the value n converted to.
Tx = (Tz−Ty · n) / (1−n) (i)

  For example, the value of “n” when the heat exchange efficiency of the total heat exchange ventilator 70 is 70% is 0.7 because the heat exchange efficiency in the total heat exchange element 15 is also 70%. The value of n is set by the manufacturer of the total heat exchanging ventilator 70 and stored in advance in a storage unit (not shown), or inputted and stored by the user from the command input unit 60 (see FIG. 2-4). Stored in a unit (not shown). The storage unit in which the value “n” is stored is provided in the calculation / control unit 50, for example.

  In step S43, the detected temperature Tx when the outdoor temperature sensor 47 (see FIG. 1-1) determined to be malfunctioning in step S2 (see FIG. 3) is normal, that is, the temperature of the outside air, The calculation / control unit 50 calculates the detected temperature Tz of the first indoor side temperature sensor 43. Specifically, the detected temperature Tx is replaced with the detected temperature Tz.

  Thereafter, the detected temperature calculated in step S42 is used as the detected temperature Tx of the outdoor temperature sensor 47 during the heat exchange ventilation operation, and the detected temperature calculated in step S43 is detected by the outdoor temperature sensor 47 during the normal ventilation operation. Using as Tx, the calculation / control unit 50 performs the above-described steps S11 to S30.

  In the second automatic ventilation algorithm, the calculation / control unit 50 uses the detected temperature of the first indoor side temperature sensor 43 determined to be normal and the heat exchange efficiency in the total heat exchange element 15 to calculate the temperature of the outside air. The automatic switching from the heat exchange ventilation operation to the normal ventilation operation is performed using the calculated temperature of the outside air and the detected temperature of the second indoor side temperature sensor 45. Further, automatic switching from the normal ventilation operation to the heat exchange ventilation operation is performed using the detection temperature of the first indoor side temperature sensor 43 and the detection temperature of the second indoor side temperature sensor 45. Therefore, even if the outdoor temperature sensor 47 is out of order, the calculation / control unit 50 controls the operation of the air path switching unit 40 to change the operation of the total heat exchange ventilator 70 between the heat exchange ventilation operation and the normal ventilation operation. Switch to automatically.

  In this way, the total heat exchange ventilator 70 can execute the second automatic ventilation algorithm, so that the operation is automatically performed between the heat exchange ventilation operation and the normal ventilation operation even if the temperature of the outside air cannot be measured or detected. You can switch to It is not an essential requirement to provide a temperature sensor (outdoor temperature sensor 47) in the vicinity of the suction port (outside air suction port 20a; see FIG. 1-1) of the outdoor air passage OF that is exposed to a severer environment than the room. Of course, while the outdoor temperature sensor 47 is normal, using the detected temperature, the detected temperature of the first indoor side temperature sensor 43, and the detected temperature of the second indoor side temperature sensor 45, the heat exchange ventilation operation and normal Automatic switching with ventilation operation can be performed more appropriately.

  As mentioned above, although the embodiment was given and demonstrated about the total heat exchange ventilation apparatus of this invention, as mentioned above, this invention is not limited to the above-mentioned form. The total heat exchanging ventilator of the present invention is not limited as long as it can execute the second automatic ventilation algorithm described above, and its structure can be selected as appropriate. Also, the outdoor temperature sensor can be omitted. However, from the viewpoint of more appropriately performing automatic switching between heat exchange ventilation operation and normal ventilation operation, an outdoor temperature sensor is provided, and the first automatic ventilation algorithm is executed while the outdoor temperature sensor is normal. Is preferred.

  The control content of the calculation / control unit in the first automatic ventilation algorithm is to control the operation of the air path switching unit using the detected temperature of the second indoor side temperature sensor and the detected temperature of the outdoor temperature sensor, and as a result What is necessary is just to switch automatically between exchange ventilation operation and normal ventilation operation, and the specific control content and control method can be selected suitably.

  Similarly, the control contents of the calculation / control unit in the second automatic ventilation algorithm include the detection result of the first indoor side temperature sensor, the detection result of the second indoor side temperature sensor, and the heat exchange efficiency in the total heat exchange element. And calculating the temperature of the outside air, and controlling the operation of the air passage switching unit based on the calculation result, the detection result of the first indoor side temperature sensor, and the detection result of the second indoor side temperature sensor, and heat exchange ventilation What is necessary is just to switch an operation | movement and a normal ventilation operation automatically, The concrete control content and control method can be selected suitably. The total heat exchange ventilator of the present invention can be variously modified, modified, combined, etc. in addition to those described above.

  The total heat exchange ventilator according to the present invention can be used as a ventilator that performs air conditioning in a room where a human lives, or as a ventilator that performs air conditioning in a box or a room containing a heating element.

It is a partial longitudinal cross-sectional view which shows roughly the mode at the time of the heat exchange ventilation in an example of the total heat exchange ventilation apparatus of this invention. It is a partial longitudinal cross-sectional view which shows roughly the mode at the time of the normal ventilation in the total heat exchange ventilation apparatus shown to FIGS. 1-1. It is an enlarged view which shows roughly the command input part which the total heat exchange ventilation apparatus shown to FIGS. 1-1 has. It is another enlarged view which shows roughly the command input part which the total heat exchange ventilation apparatus shown to FIGS. 1-1 has. It is the further another enlarged view which shows roughly the command input part which the total heat exchange ventilation apparatus shown to FIGS. 1-1 has. It is the further another enlarged view which shows roughly the command input part which the total heat exchange ventilation apparatus shown to FIGS. 1-1 has. It is a flowchart which shows roughly an example of the operation control which a calculation and control part performs until it complete | finishes a driving | operation after the total heat exchange ventilation apparatus shown to FIGS. 1-1 and 1-2 starts a driving | operation. . It is a flowchart which shows roughly an example of the operation control which a calculation and control part performs with the 1st automatic ventilation algorithm shown in FIG. It is a flowchart which shows roughly an example of the operation control which a calculation and control part performs with the 2nd automatic ventilation algorithm shown in FIG.

Explanation of symbols

10 Housing 15 Total heat exchange element 20a Outside air inlet (outside air inlet)
20b Outside air outlet (outside air outlet)
25a Indoor air inlet (inlet air inlet)
25b Indoor air outlet (outlet for indoor air duct)
DESCRIPTION OF SYMBOLS 30 Air supply fan 35 Exhaust fan 40 Air path switching part 43 1st indoor side temperature sensor 45 2nd indoor side temperature sensor 47 Outdoor side temperature sensor 50 Computation and control part 60 Command input part 70 Total heat exchange ventilation apparatus OF Outdoor air path IF Indoor air passage TF Heat exchange air passage BF Bypass air passage

Claims (3)

A total heat exchange element is arranged in the middle of the outdoor air passage that takes in outside air and blows it out into the room, and an air passage switching unit is arranged in the middle of the indoor air air passage that takes in room air and blows it out outside. The bypass air that bypasses the total heat exchange element and the heat exchange air path through which the indoor air passes through the total heat exchange element is controlled by the calculation / control unit based on the temperature of A total heat exchange ventilator that switches the indoor air path to a road,
A first indoor side temperature sensor provided in the vicinity of the air outlet in the outside air passage;
A second indoor side temperature sensor provided in the vicinity of the suction port in the indoor air air passage;
With
The calculation / control unit calculates the temperature of the outside air using a detection result of each of the first indoor side temperature sensor and the second indoor side temperature sensor and a heat exchange efficiency in the total heat exchange element, Controlling the operation of the air path switching unit based on the calculation result, the detection result of the first indoor side temperature sensor, and the detection result of the second indoor side temperature sensor;
Total heat exchange ventilator characterized by that. Further comprising an outdoor temperature sensor provided in the vicinity of the suction port in the outdoor air passage,
The calculation / control unit controls the operation of the air path switching unit based on the detection result of the outdoor temperature sensor and the detection result of the second indoor temperature sensor when the outdoor temperature sensor is normal, When the outdoor temperature sensor fails, the temperature of the outside air is determined using the detection results of the first indoor temperature sensor and the second indoor temperature sensor and the heat exchange efficiency of the total heat exchange element. Calculating and controlling the operation of the air path switching unit based on the calculation result, the detection result of the first indoor side temperature sensor, and the detection result of the second indoor side temperature sensor;
Total heat exchange ventilator characterized by that. A command input unit for inputting a command to the calculation / control unit;
When a command for designating heat exchange efficiency in the total heat exchange element is input from the command input, the calculation / control unit, the designated heat exchange efficiency and a detection result of the first indoor side temperature sensor, A temperature of the outside air is calculated using a detection result of the second indoor side temperature sensor;
The total heat exchange ventilator according to claim 1 or 2.

Images