JP2013224774A - Air-conditioning ventilator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air-conditioning ventilator capable of increasing a degree of freedom in a condition of outside air temperature for humidifying operation.SOLUTION: An air-conditioning ventilator 1 for supplying air OA of the outside SO, into the room through an air supply flow channel 20 while discharging the air RA of the inside SI to the outside SO through an exhaust flow channel 30, includes a total heat exchange element 52, a humidifying unit 60 and a control unit 7. The total heat exchange element 52 exchanges heat between the air OA of the outside SO and the air RA of the inside SI. The humidifying unit 60 has a water supply tank 63, a drain path 66 and a drain valve 67, and humidifies the air passed through the total heat exchange element 52 an not supplied yet to the inside of the room SI in the air supply flow channel 20. A control section 70 opens the drain valve 67 to discharge the water in the water supply tank 63 when drain conditions that an air temperature of the outside SO is a predetermined outdoor temperature or less, and an air temperature of the inside SI is a predetermined indoor temperature or less, are satisfied.

Description

  The present invention relates to an air conditioning ventilator that performs ventilation and air conditioning.

  Conventionally, in a ventilator, a total heat exchanger for exchanging heat between the exhaust from the room and the supply from the outside is provided, and the heat contained in the exhaust from the room is supplied to the room. The structure used for temperature control is adopted.

  In such a ventilator, in order to be able to adjust not only the temperature of the air supplied into the room but also the humidity, for example, in the ventilator described in Patent Document 1 (Japanese Patent Laid-Open No. 11-304206), It has been proposed to arrange a humidifying element in the middle of the air supply channel downstream of the total heat exchanger. As a result, the air whose temperature has been adjusted by passing through the total heat exchanger can be further conditioned by the humidifying element and sent out to the room.

  Furthermore, in the ventilator of Patent Document 1, in consideration of the case where it is used in an environment where the outside air temperature is low, such as in a cold district, when the outside air temperature becomes lower than a specific reference temperature, in order to prevent freezing. In addition, control is performed to drain the water held by the humidifying element.

  Thus, in the ventilator described in Patent Literature 1, when the outside air temperature falls below a specific reference temperature, the water for humidification is drained. For this reason, in the conventional apparatus, the humidifying operation cannot be performed in a state where the outside air temperature is lower than a predetermined reference temperature.

  This invention is made | formed in view of the point mentioned above, The subject of this invention is providing the air-conditioning ventilator which can increase the freedom degree of the conditions of the external temperature which can perform a humidification driving | operation. It is in.

  An air-conditioning ventilator according to a first aspect is an air-conditioning ventilator that sends out outdoor air into the room through an air supply channel while exhausting indoor air through the exhaust channel, and includes a heat exchange unit, A humidifying unit and a control unit are provided. The heat exchange unit exchanges heat between outdoor air and indoor air. The humidifying unit has a holding unit and a drainage unit, and is humidified by water held by the holding unit after passing through the total heat exchanger and before being sent into the room in the air supply channel. To do. The holding unit holds water for humidification. The drainage unit can drain the water held in the holding unit. The control unit drains the water held in the holding unit when the outdoor air temperature is equal to or lower than the predetermined outdoor temperature and the drainage condition that the indoor air temperature is equal to or lower than the predetermined indoor temperature is satisfied. To control the drainage section. In the state where water is held in the holding unit, the humidification operation may always be performed, or the humidification operation is performed only under certain conditions or conditions such as accepting a humidification operation instruction from the user. It may be.

  In this air-conditioning ventilator, the humidifying water held in the holding unit of the humidifying unit is not drained until the drainage condition is satisfied, so that the humidifying operation by the humidifying unit is possible. Here, in the drainage conditions for the controller to drain, not only the outdoor temperature is satisfied to be equal to or lower than the predetermined outdoor temperature, but the indoor temperature is also equal to or lower than the predetermined indoor temperature is included in the condition. Yes.

  For this reason, even when the outdoor temperature decreases and the temperature of the supply air toward the humidifying section decreases, when the temperature of the exhaust from the room is higher than the predetermined temperature in the room, when passing through the heat exchange section Furthermore, it becomes possible to raise the temperature of the air supply which goes to a humidification part with the heat contained in the exhaust_gas | exhaustion from a room | chamber interior. As described above, the heat contained in the exhaust from the room can be used to increase the temperature of the supply air that passes through the humidifying unit, so that the humidifying unit can be prevented from freezing. Accordingly, the value of the predetermined outdoor temperature at which the humidification operation can be performed can be determined in anticipation that the temperature of the supply air passing through the humidification unit rises in response to heat contained in the exhaust from the room. That is, when the indoor predetermined temperature value is set high, the outdoor predetermined temperature value can be set low, and when the indoor predetermined temperature value is set low, the outdoor predetermined temperature value is increased. Thus, the value of the predetermined outdoor temperature that can prevent the humidification unit from freezing can be freely determined according to the set value of the predetermined indoor temperature. Therefore, it becomes possible to increase the degree of freedom of the conditions of the outside air temperature at which the humidifying operation can be performed.

  The air-conditioning ventilator according to the second aspect is the air-conditioning ventilator according to the first aspect, and further includes an exhaust fan provided in the exhaust passage and an air supply fan provided in the air supply passage. The control unit changes the balance between the air flow rate of the exhaust fan and the air flow rate of the air supply fan based on the outdoor temperature and the average value of the indoor temperature.

  In this air-conditioning ventilator, the balance between the air volume of the exhaust fan and the air volume of the air supply fan can be changed based on the average value of the outdoor temperature and the indoor temperature. When the average value is low, the air volume of the exhaust fan is increased, the air volume of the exhaust fan is increased, or the air volume of the exhaust fan is increased while the air volume of the exhaust fan is decreased. Thus, it becomes possible to prevent the humidification part from freezing more reliably.

  The air-conditioning ventilator according to the third aspect is the air-conditioning ventilator according to the first aspect or the second aspect, and the values of the predetermined outdoor temperature and the predetermined indoor temperature in the drainage conditions are equal to the supply air amount and the exhaust air amount. The temperature of the air that passes through the heat exchanging section and is sent to the humidifying section is determined not to fall below zero.

  In this air-conditioning ventilator, since the control unit can control the temperature of the air passing through the humidifying unit so as not to become below zero, it is possible to more reliably prevent the humidifying unit from freezing.

  The air-conditioning ventilator according to the fourth aspect is the air-conditioning ventilator according to the third aspect, wherein the values of the outdoor predetermined temperature and the indoor predetermined temperature in the drainage condition are the temperature exchange efficiency between the supply air and the exhaust of the heat exchange unit It is determined based on the value of.

  The air-conditioning ventilator according to a fifth aspect is the air-conditioning ventilator according to any one of the first to fourth aspects, and detects the temperature of the air before passing through the heat exchanging portion in the exhaust passage. The unit is further provided. A control part judges drainage conditions based on the detection temperature of a room temperature detection part.

  In this air-conditioning ventilator, since the temperature of the air sent to the heat exchange unit can be accurately grasped, the temperature of the air that has passed through the heat exchange unit in the air supply passage can be specified in more detail, and the humidification unit It is possible to relax the conditions for preventing the freezing of the material as much as possible.

  In the air-conditioning ventilator according to the first aspect, it becomes possible to increase the degree of freedom of the condition of the outside air temperature at which the humidifying operation can be performed.

  In the air-conditioning ventilator according to the second aspect, it is possible to more reliably prevent the humidification unit from freezing.

  In the air-conditioning ventilator according to the third and fourth aspects, it is possible to more reliably prevent the humidification unit from freezing.

  In the air-conditioning ventilator according to the fifth aspect, the conditions for preventing the humidification part from freezing can be relaxed as much as possible.

It is a schematic block diagram of the building to which the air-conditioning ventilator which concerns on 1st Embodiment was applied. It is a schematic side view which shows the state by which the air-conditioning ventilation apparatus was installed in the back of the ceiling. It is a schematic block diagram of a heat exchange element. It is a system block block diagram concerning 1st Embodiment. It is a control flowchart of drainage control. It is the figure which showed an example of drainage conditions with the graph.

  Hereinafter, an embodiment of an air-conditioning ventilator will be described with reference to the drawings.

(1) 1st Embodiment In FIG. 1, the conceptual diagram explaining the flow of the air ventilated by the air-conditioning ventilator 1 is shown. In FIG. 1, the arrangement of members such as a fan is changed for easy understanding of the air flow.

  In FIG. 2, the side view of the air-conditioning ventilator 1 in the state installed in the ceiling material 99 or the wall surface 98 is shown.

(2) Schematic configuration of the air-conditioning ventilator 1 As shown in FIG. 2, the air-conditioning ventilator 1 of the present embodiment supplies fresh air of outdoor SO to the indoor SI that is the target space, and the air of the indoor SI is outdoor. It is a device that vents while discharging heat to SO and exchanging heat between exhaust air and supply air. The air-conditioning ventilator 1 of this embodiment is installed in the space between the ceiling material 99 and the ceiling surface 97.

  The air-conditioning ventilator 1 mainly includes a total heat exchange unit 50, a humidification unit 60, an air supply room outside duct 21, an air supply room inside duct 22, an exhaust room inside duct 31, an exhaust room outside duct 32, an indoor temperature sensor T1, and And an outdoor temperature sensor T2 and the like.

(2-1) Total heat exchange unit 50
The total heat exchange unit 50 includes a total heat exchange casing 51, a total heat exchange element 52, an exhaust fan 54, an exhaust fan motor 54m, an air supply fan 53, an air supply fan motor 53m, an air supply filter 52a, an exhaust filter 52c, and It has a control unit 7 and the like.

  The total heat exchange casing 51 has a substantially rectangular parallelepiped shape having a side surface 70 on which a maintenance opening 71 is formed.

  Each of the side surface 70 and the opposite side surface of the total heat exchange casing 51 is provided with two mounting brackets 92 as fixing means. The total heat exchanging casing 51 includes a ceiling member 99 and a ceiling surface by screwing and fixing the mounting bracket 92 and a plurality of bolts 91 fixed so as to extend downward from the ceiling surface 97. It is fixed in a state of being suspended in a ceiling space between 97.

  A maintenance lid 80 is attached to the side surface 70 to cover the maintenance opening 71 penetrating laterally from the side. Further, on the side surface 70, the control unit 7 is installed on the side of the maintenance lid 80 and outside the total heat exchange casing 51. Inside the control unit 7, a control unit 7a constituted by an electrical board or the like is arranged.

  Inside the total heat exchange casing 51, a total heat exchange element 52 for exchanging sensible heat and latent heat simultaneously is arranged as shown in FIG. The total heat exchange element 52 is configured by laminating a large number of heat transfer sheets on a flat plate with a space therebetween via a spacer. The total heat exchange element 52 is configured such that a pair of the air supply flow path portion and the exhaust flow path portion are in contact with each other via the heat transfer sheet, and the flow direction in the air supply flow path portion and the flow direction in which the exhaust flow path portion flows Are substantially opposed to each other and are not mixed with each other. This heat transfer sheet is formed of a moisture-permeable member such as paper.

  The internal space of the total heat exchange casing 51 is an air supply chamber outer space 5 a that is the outdoor side of the air supply channel 20 with respect to the total heat exchange element 52, and an indoor side of the air supply channel 20 with respect to the total heat exchange element 52. A certain air supply indoor space 5 b, an exhaust indoor space 5 c that is the indoor side of the exhaust flow path 30 with respect to the total heat exchange element 52, and an outdoor side of the exhaust flow path 30 with respect to the total heat exchange element 52. It is partitioned into an exhaust chamber outer space 5d.

  An air supply filter 52a is disposed on the surface of the total heat exchange element 52 on the air supply chamber outer space 5a side. The air supply filter 52a supplements dust contained in the air taken in from the outdoor SO. An exhaust filter 52c is disposed on the surface of the total heat exchange element 52 on the exhaust chamber inner space 5c side. The exhaust filter 52c supplements dust contained in the air taken in from the room SI.

  An air supply fan 53 for sending outdoor SO air OA to the indoor SI is arranged in the air supply chamber outer space 5a of the total heat exchange casing 51. As shown in FIG. 4, the air supply fan motor 53m that drives the air supply fan 53 is driven in response to an instruction from the control unit 7a.

  In the exhaust chamber outer space 5d of the total heat exchange casing 51, an exhaust fan 54 for sending the air RA in the room SI to the outdoor SO is arranged. As shown in FIG. 4, the exhaust fan motor 54m that drives the exhaust fan 54 is driven in response to an instruction from the controller 7a.

(2-2) Humidification unit 60
A humidification unit 60 is attached to the total heat exchange casing 51 of the total heat exchange unit 51 on the air supply room inner space 5b side.

  The humidification unit 60 mainly has a humidification casing 61, a humidification element 62, a water supply tank 63, a water supply valve 64, a water supply path 65, a drainage path 66, a drainage valve 67, and the like.

  One of the spaces in the humidifying casing 61 communicates with the air supply indoor space 5 b of the total heat exchange casing 51, and the other communicates with the air supply indoor duct 22. A humidifying element 62 and a water supply tank 63 are arranged inside the humidifying casing 61. The humidifying element 62 is formed of a water vapor permeable membrane that retains moisture, and humidifies the air passing therethrough. The water supply tank 63 holds water therein. The water in the water supply tank 63 is supplied to the humidifying element 62 through a mechanism (not shown). A drain pan (not shown) is disposed below the humidifying element 62 to catch and drain water dripped from the humidifying element 62.

  The water supply tank 63 is connected to a water supply path 65 and a drainage path 66. The water supply path 65 is provided with a water supply valve 64 that supplies water to the water supply tank 63 in an open state and stops water supply to the water supply tank 63 in a closed state. The drainage channel 66 is provided with a drainage valve 67 that drains water from the water supply tank 63 in a closed state and stops draining water from the water supply tank 63 in a closed state. As shown in FIG. 4, both the water supply valve 64 and the drain valve 67 are controlled to open and close in response to an instruction from the controller 7a.

(2-3) Each Duct The air supply chamber outer space 5a of the total heat exchange casing 51 is connected to the air supply chamber outer duct 21 and communicates with the outdoor SO. In the humidification casing 61 of the humidification unit 60, the air supply indoor duct 22 is connected and communicates with the indoor SI. The exhaust room side space 5c of the total heat exchange casing 51 is connected to the exhaust room side duct 31 and communicates with the room SI. The exhaust chamber outer space 5d of the total heat exchange casing 51 is connected to the exhaust chamber outer duct 32 and communicates with the outdoor SO.

  The supply air flow path 20 includes a supply air chamber outer duct 21, a supply air chamber outer space 5 a of the total heat exchange casing 51, a supply air passage portion in the total heat exchange element 52, and a supply air chamber inner space 5 b of the total heat exchange casing 51. The space in the humidification casing 61 of the humidification unit 60 and the air supply indoor side duct 22 are configured. When the air supply fan 53 is driven, the air in the outdoor SO flows in this order and is supplied to the indoor SI. The

  The exhaust passage 30 includes an exhaust chamber inner duct 31, an exhaust chamber inner space 5c of the total heat exchange casing 51, an exhaust air passage portion in the total heat exchange element 52, an exhaust chamber outer space 5d of the total heat exchange casing 51, and an exhaust. The outdoor duct 32 is configured. When the exhaust fan 54 is driven, the air RA in the indoor SI flows in this order and is discharged to the outdoor SO.

(2-4) Indoor temperature sensor T1 and outdoor temperature sensor T2
The indoor temperature sensor T1 is a thermistor disposed in the exhaust indoor space 5c of the total heat exchange casing 51, and detects the indoor temperature. This indoor temperature sensor T1 does not detect the temperature near the outlet of the air supply indoor side duct 22, but detects the temperature of the air that has passed through the exhaust indoor side duct 31 from the indoor SI. I can grasp it.

  The outdoor temperature sensor T2 is a thermistor disposed in the air supply chamber outer space 5a of the total heat exchange casing 51, and detects the outdoor temperature.

  As shown in FIG. 4, the indoor temperature sensor T1 and the outdoor temperature sensor T2 are connected so that the control unit 7a can grasp the detected value.

(2-5) Controller 90
A controller 90 is arranged in the room SI so that the user can operate the air-conditioning ventilator 1. Information input from the controller 90 is transmitted to the control unit 7a, and various controls are performed.

(3) Driving operation The control unit 7a controls the supply fan motor 53m and the exhaust fan motor 54m according to the information input via the controller 90 and the detection values of the indoor temperature sensor T1 and the outdoor temperature sensor T2. And the opening / closing control of the water supply valve 64 and the drain valve 67 is performed.

  When the controller 7a receives an instruction to perform the humidifying operation from the controller 90, the controller 7a basically opens the water supply valve 64 and closes the drain valve 67, and puts the water into the water supply tank 63. Is maintained. Thereby, moisture is continuously supplied from the water supply tank 63 to the humidifying element 62, and the passing air can be humidified.

  By receiving an operation instruction from the controller 90, the control unit 7a drives the supply fan motor 53m and the exhaust fan motor 54m so that the supply air amount and the exhaust air amount become equal.

  As a result, fresh air OA in the outdoor SO is taken into the air supply room inner space 5b of the total heat exchange unit 50 through the air supply chamber outer duct 21, and after the dust is removed by the air supply filter 52a, the total heat exchange element Heat exchange is performed with the air RA exhausted from the room SI by passing through 52, the temperature is adjusted so as to approach the temperature of the room SI, and the heat is sent to the air supply indoor space 5b. The air whose temperature is adjusted in this way is further humidified by passing through the humidifying element 62 of the humidifying unit 60 during the humidifying operation. Thereafter, fresh and temperature-adjusted air in some cases is supplied to the indoor SI through the air supply indoor duct 22.

  On the other hand, the air RA in the room SI is taken into the exhaust room side space 5c of the total heat exchange unit 50 through the exhaust room side duct 31, and dust is removed by the exhaust filter 52c, and then passes through the total heat exchange element 52. Thus, heat exchange is performed with the air OA supplied from the outdoor SO, waste heat is supplied to the supplied air, and the heat is sent to the outer space 5d of the exhaust chamber. Thereafter, the exhaust is discharged to the outdoor SO via the exhaust chamber outer duct 32.

  When the controller 7a receives an operation instruction from the controller 90 and the temperature obtained from the outdoor temperature sensor T2 satisfies a predetermined intermittent condition, the supply fan motor 53m and the exhaust fan motor 54m. Are not maintained, but intermittent operation is performed to control operation so that the supply fan motor 53m and the exhaust fan motor 54m are alternately driven and stopped. By this intermittent operation, the total heat exchange element 52 is protected from damage due to freezing or the like. The predetermined intermittent condition is not particularly limited. For example, the temperature obtained from the outdoor temperature sensor T2 is 0 ° C. or less and higher than an outdoor air temperature condition of a drainage condition described later. it can.

(4) Drainage operation The control unit 7a determines whether the temperature obtained from the indoor temperature sensor T1 and the outdoor temperature sensor T2 satisfies the drainage condition at the time of both starting and operation, and satisfies the drainage condition. If there is, the drainage control is performed by opening the drain valve 67 and closing the water supply valve 64.

  In the present embodiment, the drainage conditions are that the outside air temperature is less than −15 ° C. and the room temperature is less than 10 ° C. Regarding the relationship between the outdoor temperature and the indoor temperature, when the supply fan motor 53m and the exhaust fan motor 54m are operated equally, the air OA taken from the outdoor SO passes through the total heat exchange element 52 and is warmed. It is predetermined on the condition that the temperature of the air when passing through the humidifying unit 60 later does not become zero. Here, whether or not the temperature of the air when passing through the humidifying unit 60 becomes lower than zero is determined based on the temperature exchange efficiency of the total heat exchange element 52. In the present embodiment, the temperature exchange efficiency of the total heat exchange element 52 is 60% or more.

  FIG. 5 shows a flowchart of drainage control.

  In step S10, the control unit 7a grasps the outdoor temperature based on the temperature obtained from the outdoor temperature sensor T2, and proceeds to step S11.

  In step S11, the control unit 7a determines whether or not the outdoor temperature grasped in step S11 is less than −15 ° C., which is a condition related to the outdoor temperature among the drainage conditions. If the outdoor temperature is less than −15 ° C., the process proceeds to step S12. If the outdoor temperature is not less than −15 ° C., the process returns to step S10 and is repeated.

  In step S12, the controller 7a grasps the room temperature based on the temperature obtained from the room temperature sensor T1, and proceeds to step S13.

  In step S13, the control unit 7a determines whether or not the room temperature grasped in step S12 is less than 10 ° C., which is a condition related to the room temperature among the drainage conditions. If the room temperature is less than 10 ° C., the process proceeds to step S14. If the room temperature is not less than 10 ° C., the process returns to step S10 and is repeated.

  In step S <b> 14, the control unit 7 a opens the drain valve 67, closes the water supply valve 64, and drains the water in the water supply tank 63 through the drain channel 66. Thereby, the water supply tank 63 can be in a state where water is not held. The drain valve 67 is closed when 30 minutes have passed since opening.

  In step S15, the control unit 7a grasps again the temperature obtained from the outdoor temperature sensor T2, and determines whether or not the outdoor temperature is higher than −12 ° C. If the outdoor temperature is higher than −12 ° C., the process proceeds to step S16. If the outdoor temperature is not higher than −12 ° C., step S15 is repeated.

  In step S16, the control unit 7a performs control to open the water supply valve 64 while closing the drain valve 67 when the drain valve 67 is open and maintaining the closed state when the drain valve 67 is closed, and ends the drain control. To do.

(5) Features of the air-conditioning ventilator 1 of the first embodiment (5-1)
In the air-conditioning ventilator 1 of the first embodiment, the temperature of the supply air from the outdoor SO toward the humidifying element 62 is included in the exhaust from the indoor SI by considering not only the outdoor temperature but also the indoor temperature in the drainage condition. In anticipation of rising due to heat, the outdoor temperature condition that can prevent the humidifying element 62 from freezing can be freely determined according to the indoor temperature condition. Therefore, it is possible to increase the degree of freedom of the conditions of the outside air temperature at which the humidifying operation can be performed.

(5-2)
Conventionally, in an air-conditioning ventilator with a humidifying function, water for the humidifying element is drained to prevent freezing when the outdoor air temperature is less than −10 ° C. For this reason, as shown in FIG. 6, in the conventional apparatus, the operation state in which the humidification operation is possible without being drained is limited to the region indicated by “X”.

  On the other hand, in the ventilation air conditioner 1 of the first embodiment, the drainage condition is determined so that the humidifying element 62 does not freeze in consideration of not only the outdoor temperature but also the indoor temperature. In the area indicated by “Y” as well as the area “X”, the humidification operation can be performed in a state where water is held in the water supply tank 63 without draining.

  For this reason, the condition range which can perform a humidification driving | operation can be expanded compared with the past.

  Moreover, since the situation where water is held in the water supply tank 63 can be made longer than before, the time zone during which the humidifying operation is performed can be made longer.

  In particular, when the outdoor temperature is lowered, the air taken into the indoor SI from the outdoor SO tends to be dry air. On the other hand, in the air-conditioning ventilator 1 of the present embodiment, it is possible to perform the humidification operation as much as possible even when the outdoor temperature is lowered and dry air is taken in.

(6) Other Embodiments Each of the above-described embodiments may be an embodiment obtained by being modified as described below.

(6-1) Other embodiment A
In the first embodiment, the case where the drainage condition is “the outside air temperature is less than −15 ° C. and the room temperature is less than 10 ° C.” has been described as an example.

  On the other hand, the drainage conditions are not limited to this. For example, when the temperature condition of the outside air temperature is set lower than the drainage conditions of the first embodiment, the indoor temperature condition is made higher. It may be set. Further, when the temperature condition of the outside air temperature is set higher than the drainage condition of the first embodiment, the room temperature condition may be set lower.

  For example, when the drainage condition is “the outside air temperature is less than −10 ° C. and the room temperature is less than 10 ° C.”, the humidifying element 62 may be more frozen than in the past. It becomes possible to prevent reliably. In particular, when the control unit 7a controls the exhaust fan motor 54m or the supply fan motor 53m so that the amount of air supplied from the outdoor SO is larger than the amount of exhaust from the indoor SI, or the temperature of the outdoor SO decreases. Even in a situation where the amount of air supplied from the outdoor SO increases, freezing in the humidifying element 62 can be more reliably prevented.

(6-2) Other embodiment B
In the first embodiment, the case where the air supply fan motor 53m and the exhaust fan motor 54m are controlled so that the air supply amount and the exhaust amount are equal to each other has been described as an example.

  On the other hand, the control of the supply fan motor 53m and the exhaust fan motor 54m is not limited to this. For example, according to the average value of the detected values of the indoor temperature sensor T1 and the outdoor temperature sensor T2, The supply fan motor 53m and the exhaust fan motor 54m may be controlled so as to change the balance of the exhaust amount.

  As the control here, for example, when the average value of the indoor temperature detected by the indoor temperature sensor T1 and the outdoor air temperature detected by the outdoor temperature sensor T2 decreases, the control unit 7a reduces the air volume by the air supply fan 53. Alternatively, the output of the supply fan motor 53m may be decreased to maintain the output of the exhaust fan motor 54m. Alternatively, the control unit 7a may increase the output of the exhaust fan motor 54m so that the air volume by the exhaust fan 54 increases. Control may be performed to maintain the output of the supply fan motor 53m, or the control unit 7a may decrease the output of the supply fan motor 53m and increase the air volume of the exhaust fan 54 so that the air volume of the supply fan 53 decreases. Alternatively, control may be performed to increase the output of the exhaust fan motor 54m. Thus, by adjusting the air volume by the air supply fan 53 and the air volume by the exhaust fan 54, it is possible to more reliably prevent the humidifying element 62 from freezing.

  Further, the control for changing the air volume in the other embodiment B may be performed under a condition satisfying the predetermined intermittent condition in the first embodiment. In this case, for example, when the output of the exhaust fan motor 54m is changed while the drive time zone and the stop time zone of the supply fan motor 53m are alternately visited, the indoor temperature and the outdoor temperature sensor detected by the indoor temperature sensor T1. When the average value of the outside air temperature detected by T2 decreases, the control unit 7a reduces the output of the supply fan motor 53m so that the air volume by the supply fan 53 per unit time decreases, and the output of the exhaust fan motor 54m. The control unit 7a may increase the output of the exhaust fan motor 54m so that the air volume by the exhaust fan 54 increases so that the air volume by the air supply fan 53 per unit time is maintained. The output of the air fan motor 53m may be controlled, or the control unit 7a may supply air so that the air volume by the air supply fan 53 per unit time decreases. May be controlled to increase the output of the exhaust fan motor 54m as air volume by the exhaust fan 54 while lowering the output of the fan motor 53m is increased. Thus, by adjusting the air volume by the air supply fan 53 and the air volume by the exhaust fan 54, it becomes possible to more reliably prevent the humidifying element 62 from being frozen even when the outside air temperature is 0 ° C. or lower. .

  By utilizing the present invention, the degree of freedom of the outside air temperature condition that enables humidification operation can be increased. Therefore, in particular, in an air-conditioning ventilator having a humidifying function by air-conditioning a room in a cold region. It is particularly useful when applied.

DESCRIPTION OF SYMBOLS 1 Air conditioning ventilator 7 Control unit 7a Control part 20 Supply air flow path 30 Exhaust flow path 50 Total heat exchange unit 52 Total heat exchange element (heat exchange part)
53 Air supply fan 54 Exhaust fan 60 Humidification unit 62 Humidification element (humidification part)
63 Water supply tank 64 Water supply valve 65 Water supply channel 66 Drainage channel 67 Drainage valve (drainage part)
97 Ceiling surface 98 Wall surface 99 Ceiling material SI Indoor SO Outdoor T1 Indoor temperature sensor (indoor temperature detector)
T2 outdoor temperature sensor

JP-A-11-304206

Claims (5)

An air-conditioning ventilator (1) for sending outdoor air (OA) into a room through an air supply channel (20) while exhausting indoor air (RA) through the exhaust channel (30). ,
A heat exchange section (52) for exchanging heat between outdoor air and indoor air;
It has a holding part (63) holding water for humidification, and a drainage part (67) capable of draining the water held in the holding part, A humidifying unit (62) for humidifying the air after passing through the total heat exchanger and before being sent out into the room with water held by the holding unit;
When the outdoor air temperature is equal to or lower than a predetermined outdoor temperature and the drainage condition that the indoor air temperature is equal to or lower than the predetermined indoor temperature is satisfied, the water held in the holding unit is drained. A control unit (7a) for controlling the drainage unit;
Air-conditioning ventilator (1) provided with. An exhaust fan (54) provided in the exhaust flow path (30);
An air supply fan (53) provided in the air supply channel (20);
Further comprising
The controller (7a) changes the balance between the air volume of the exhaust fan and the air volume of the air supply fan, based on an average value of the outdoor temperature and the indoor temperature.
The air-conditioning ventilator (1) according to claim 1. The values of the predetermined outdoor temperature and the predetermined indoor temperature in the drainage condition are such that the temperature of the air sent to the humidifying section through the heat exchanging section does not fall below zero when the air supply amount and the exhaust amount are equal. Is defined as
The air-conditioning ventilator (1) according to claim 1 or 2. The values of the outdoor predetermined temperature and the indoor predetermined temperature in the drainage condition are determined based on the value of the temperature exchange efficiency between the supply air and the exhaust gas of the heat exchange unit,
The air-conditioning ventilator (1) according to claim 3. An indoor temperature detector (T1) for detecting the temperature of the air before passing through the heat exchanger in the exhaust flow path;
The control unit determines the drainage condition based on a detection temperature of the indoor temperature detection unit.
The air-conditioning ventilator (1) according to any one of claims 1 to 4.

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