JP2016205642A - Low temperature reproduction desiccant air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low temperature reproduction desiccant air conditioner which can control a latent heat load and a sensible heat load separately, in which accuracy of indoor temperature and humidity control is high and which does not waste energy.SOLUTION: A total heat exchanger part includes: a total heat exchanger bypass path 201 for bypassing a total heat exchanger 200; and a first path switching device for switching between an outside air path 6 which passes through the total heat exchanger 200 and the total heat exchanger bypass path 201. A latent heat control part includes: a cold/hot water coil 101 for cooling the outside air for ventilating to a desiccant rotor 102 during cooling and for heating the outside air for ventilating to the desiccant rotor 102 during heating; a desiccant rotor bypass path 150 for bypassing the desiccant rotor 102; and a second path switching device for switching between the outside air path 6 which passes through the desiccant rotor 102 and the desiccant rotor bypass path 150. A low temperature reproduction desiccant air conditioner includes enthalpy measurement means for measuring enthalpy of the outside air as a control index of the first path switching device. It also includes a return air humidity sensor for detecting humidity of return air as a control index of the second path switching device.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a low-temperature regenerated desiccant air conditioner and relates to efficient use of a desiccant rotor.

  As this type of technology, for example, there is one described in Patent Document 1. This low temperature regeneration desiccant air conditioner includes an outside air path for supplying outside air to the room, a return air path for exhausting the return air from the room, a latent heat control unit for controlling the latent heat of the outside air in the outside air path, and the outside air in the outside air path. A sensible heat control unit for controlling the sensible heat of the gas and a total heat exchanger unit for exchanging sensible heat and latent heat between the outside air and the return air.

  The total heat exchanger unit is a total heat exchanger that exchanges sensible heat and latent heat between the outside air in the outside air path that vents to the latent heat control unit and the return air in the return air path that passes through the latent heat control unit. A first heat exchanger bypass path that communicates with the outside air path upstream and downstream of the heat exchanger to bypass the total heat exchanger, and an outside air path that passes through the total heat exchanger, and a first heat exchanger bypass path. It has a route switching device. The latent heat control unit communicates the desiccant rotor that sorbs moisture from the outside air in the outside air path and desorbs the moisture by return air on the return air path side, and communicates with the outside air path on the upstream side and downstream side of the desiccant rotor. A desiccant rotor bypass path that bypasses the desiccant rotor, and a second path switching device that switches between an outside air path passing through the desiccant rotor and a desiccant rotor bypass path.

  Moreover, what is described in Patent Document 2 includes a latent heat control unit that controls the latent heat of the outside air flowing into the system and a sensible heat control unit that controls the sensible heat of the outside air, and passes through the latent heat control unit and the sensible heat control unit. The outside air is supplied into the room, and the return air from the room is exhausted through the latent heat control unit.

  The latent heat control unit cools the desiccant rotor that sorbs moisture from the outside air on the outside air path side and regenerates the moisture by desorbing the return air on the return air path side, and cools the outside air that is vented to the desiccant rotor during cooling, A cold / hot water coil for heating the outside air to be ventilated to the desiccant rotor and a return air humidity sensor for detecting the return air humidity as an index for controlling the latent heat control unit are provided.

Patent No. 5542701 Japanese Patent No. 5666987

  In Patent Document 1, when the enthalpy of the outside air is higher than the set value in the cooling mode, the desiccant rotor is stopped to avoid the loss of sensible heat transfer by the desiccant rotor, and the heat load of the outside air is reduced by the total heat exchanger. Energy saving. Further, when the enthalpy of the outside air is lower than the set value in the cooling mode, the desiccant rotor dehumidifies to minimize the capacity of the cooling device and reduce the energy of reheating by the heating device. Moreover, in the structure of patent document 2, since the humidity of a return air is detected by a return air humidity sensor and a latent heat control part is controlled, indoor temperature / humidity control is implement | achieved.

  However, the above employs either the enthalpy of the outside air or the humidity of the return air as a control index, and there are problems in realizing energy saving and improving the accuracy of indoor temperature and humidity control at the same time. there were.

  The present invention solves the above-described problems, and can separately control a latent heat load and a sensible heat load, and is a low-temperature regenerative desiccant air conditioner that has high indoor temperature and humidity control accuracy and does not waste energy. The purpose is to provide.

  In order to solve the above problems, a low-temperature regeneration desiccant air conditioner according to the present invention controls an outside air path for supplying outside air into a room, a return air path for exhausting return air from the room, and latent heat of outside air in the outside air path. A latent heat control unit, a sensible heat control unit for controlling the sensible heat of the outside air in the outside air path, and a total heat exchanger unit for exchanging sensible heat and latent heat between the outside air and the return air, and a total heat exchanger unit Is a total heat exchanger that exchanges sensible heat and latent heat between the outside air of the outside air path that ventilates the latent heat control unit and the return air of the return air path that has passed through the latent heat control unit, and an upstream side of the total heat exchanger and A total heat exchanger bypass path that communicates with the outside air path on the downstream side to bypass the total heat exchanger, and a first path switching device that switches between the outside air path that passes through the total heat exchanger and the total heat exchanger bypass path The latent heat control unit sorbs moisture from the outside air in the outside air path and returns the moisture by returning air on the return air path side. A desiccant rotor to be detached and regenerated, a cold / hot water coil that cools the outside air that is vented to the desiccant rotor during cooling and heats the outside air that is vented to the desiccant rotor during heating, and communicates with the outside air path upstream and downstream of the desiccant rotor. And a second path switching device that switches between the desiccant rotor bypass path that bypasses the desiccant rotor, the outside air path that passes through the desiccant rotor, and the desiccant rotor bypass path, and the enthalpy of the outside air as a control index of the first path switching device And a return air humidity sensor for detecting the humidity of the return air as a control index of the second path switching device.

In the low-temperature regeneration desiccant air conditioner according to the present invention, the latent heat control unit includes a return air preheating unit that heats the return air ventilated to the desiccant rotor.
In the low-temperature regeneration desiccant air conditioner of the present invention, the latent heat control unit includes an outside air humidifying unit that humidifies outside air that has passed through the desiccant rotor.
The low-temperature regeneration desiccant air conditioner of the present invention is characterized by having a return path for return air that communicates the return air path and the outside air path downstream of the latent heat control unit.

  The operation method of the low-temperature regeneration desiccant air conditioner of the present invention controls the latent heat of the outside air supplied into the room with the latent heat control unit, controls the sensible heat of the outside air that has passed through the latent heat control unit with the sensible heat control unit, The outside air that has passed through the control unit is supplied to the room, the return air from the room is exhausted through the latent heat control unit, and the outside air that is vented to the latent heat control unit by the total heat exchanger and the return air that has passed through the latent heat control unit The sensible heat and latent heat are exchanged with each other, the enthalpy of the outside air is measured by the enthalpy measuring means, and the first path switching device is operated using the enthalpy of the outside air as a control index. The second path switching device switches between the total heat exchanger bypass path that communicates with the downstream outside air path and bypasses the total heat exchanger and the outside air path that passes through the total heat exchanger, and uses the return air humidity as a control index. By operating the A desiccant rotor bypass path bypassing the desiccant rotor communicates with the outside air path on the upstream side of the outdoor air path and a downstream side of the rotor, and switches the outside air path through the desiccant rotor.

  In the operation method of the low-temperature regeneration desiccant air conditioner of the present invention, when the enthalpy of the outside air is higher than the set enthalpy and the return air humidity is higher than the set humidity during cooling, the first path switching device is operated to operate the total heat The outside air path passing through the exchanger is selected, and the second path switching device is operated to select the outside air path passing through the desiccant rotor.

  In the operation method of the low-temperature regeneration desiccant air conditioner of the present invention, when the enthalpy of the outside air is lower than the set enthalpy and the return air humidity is higher than the set humidity during cooling, the first path switching device is operated to operate the total heat The exchanger bypass path is selected, and the second path switching device is operated to select the outside air path passing through the desiccant rotor.

  In the operation method of the low-temperature regeneration desiccant air conditioner of the present invention, during heating, the first path switching device is operated to select the outside air path passing through the total heat exchanger, and the second path switching device is operated to operate the desiccant. It is characterized by selecting an outside air path through the rotor.

  As described above, according to the present invention, the adjustment of the latent heat load in the room by controlling the humidity of the outside air taken into the room and the adjustment of the sensible heat load by the temperature control are performed separately. The accuracy of temperature and humidity control is increased. Further, since the desiccant rotor is regenerated by dehumidifying it with return air, a heating source for regeneration is not basically required, and energy is not wasted.

  Using the enthalpy of outside air as a control index, the first path switching device is operated to switch between the total heat exchanger bypass path that bypasses the total heat exchanger and the outside air path that passes through the total heat exchanger, and also controls the return air humidity By operating the second path switching device as an index and switching between the desiccant rotor bypass path that bypasses the desiccant rotor and the outside air path that passes through the desiccant rotor, the total heat exchanger and the desiccant rotor are used separately for cooling equipment and heating. Operation that uses the equipment's capabilities without waste can be realized.

  When the enthalpy of the outside air during cooling is lower than the set enthalpy and the return air humidity is higher than the set humidity, the first path switching device is operated to select the total heat exchanger bypass path, and the second path Operate the switching device to select the outside air path through the desiccant rotor. By this operation, the capacity of the cooling device can be minimized by dehumidifying with the desiccant rotor, and the energy of reheating by the heating device can be reduced.

The schematic diagram which shows the structure of the air conditioner in embodiment of this invention, shows the driving | running state at the peak time when the enthalpy of the outside air at the time of air conditioning is higher than a setting value, and return air humidity is higher than a setting value The schematic diagram which shows the driving | running state of the interim period in which the enthalpy of the external air at the time of air_conditioning | cooling in the same embodiment is lower than a setting value, and return air humidity is higher than a setting value Schematic showing the winter driving state in the same embodiment Airline diagram at the peak of cooling in the same embodiment Air diagram of the interim period in the same embodiment Airline diagram during heating in winter in the same embodiment

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
1, 2, and 3, the low-temperature regeneration desiccant air conditioner has an outside air port 2, an air supply port 3, a return air port 4, and an exhaust port 5 in the casing 1. The ventilation path from the air inlet 3 to the air outlet 6 will be described as the outside air path 6, and the air passage from the return air outlet 4 to the exhaust outlet 5 will be described as the return air path 7.

  In the outside air path 6, the prefilter 8, the total heat exchanger 200, the outside air fan 9, the latent heat control unit 10, the prefilter 11, the medium performance filter 121, the sensible heat control unit 12, the air supply are sequentially provided from the upstream side to the downstream side. A fan 13 is interposed. An air supply duct 14 is connected to the air supply port 3.

  In the return air path 7, a pre-filter 16, a latent heat control unit 10, a total heat exchanger 200, and an exhaust fan 17 are interposed in order from the upstream side to the downstream side, and a return air duct connected to the return air port 4. 18 is provided with a return air temperature sensor 19 and a return air humidity sensor 20. On the downstream side of the outside air path 6 of the latent heat control unit 10, there is a return air return path 21 that connects the return air path 7 and the outside air path 6, and a return air damper 22 provided in the return air return path 21. ing.

  The total heat exchanger 200 exchanges heat and moisture between the outside air that has passed through the pre-filter 8 in the outside air path 6 and the return air that has passed through the latent heat control unit 10 in the return air path 7. The vessel 200 includes a rotary type and a stationary type, but may be any form.

  A total heat exchanger bypass path 201 is provided in the outside air path 6, and the total heat exchanger bypass path 201 communicates with the outside air path 6 on the upstream side and the downstream side of the total heat exchanger 200 to connect the total heat exchanger 200. Make a detour route.

  First and second total heat exchanger ventilation control dampers 202 and 203 are provided as a first path switching device that switches between the outside air path 6 passing through the total heat exchanger 200 and the total heat exchanger bypass path 201. .

  The first total heat exchanger ventilation control damper 202 is interposed in the total heat exchanger bypass path 201, and the second total heat exchanger ventilation control damper 203 is upstream of the total heat exchanger 200. And it is interposed in the outdoor air path 6 downstream from the branch point of the total heat exchanger bypass path 201.

  The latent heat control unit 10 includes a cold / hot water coil 101, a desiccant rotor 102, and a vaporizing humidifier 103 in the outside air path 6 sequentially from the upstream side to the downstream side, and sequentially enters the return air path 7 from the upstream side to the downstream side. A hot water coil 104 and a desiccant rotor 102 are interposed.

  In the cooling mode, the desiccant rotor 102 sorbs moisture from the outside air on the processing side corresponding to the outside air path 6 and regenerates the moisture by desorbing the return air on the regeneration side corresponding to the return air path 7. In the mode, moisture is sorbed from the return air on the processing side corresponding to the return air path 7, and the moisture is desorbed and regenerated by the outside air on the regeneration side corresponding to the outside air path 6.

  As the desiccant rotor sorbent, it is preferable to use a desiccant such as zeolite, lithium chloride, or silica gel, or a polymer sorbent. In this embodiment, the polymer sorbent is highly hygroscopic during low-temperature regeneration. Consists of.

  In the cooling mode, the cold / hot water coil 101 functions as an external air precooling unit that cools the outside air that flows to the desiccant rotor 102, and the hot water coil 104 functions as a return air preheating unit that heats the return air that flows to the desiccant rotor 102.

  In the heating mode, the cold / hot water coil 101 acts as an outside air preheating part that heats the outside air that flows to the desiccant rotor 102, and the vaporizing humidifier 103 acts as an outside air humidifying part that humidifies the outside air that has passed through the desiccant rotor 102.

  The outside air path 6 is provided with a desiccant rotor bypass path 150. The desiccant rotor bypass path 150 communicates with the outside air path 6 on the downstream side of the cold / hot water coil 101 and on the upstream side of the desiccant rotor 102. A path that communicates with the outside air path 6 on the downstream side and bypasses the desiccant rotor 102 is formed.

  First and second desiccant rotor ventilation control dampers 151 and 152 are provided as second path switching devices for switching between the outside air path 6 passing through the desiccant rotor 102 and the desiccant rotor bypass path 150.

  The first desiccant rotor ventilation control damper 151 is interposed in the desiccant rotor bypass path 150, and the second desiccant rotor ventilation control damper 152 is upstream of the desiccant rotor 102 and a branch of the desiccant rotor bypass path 150. It is interposed in the outside air path 6 downstream from the point.

The sensible heat control unit 12 interposes the cold water coil 122 and the hot water coil 123 sequentially in the outside air path 6 from the upstream side to the downstream side.
The return air temperature sensor 19 detects the temperature of the return air as an index for controlling the sensible heat control unit 10, and controls the opening or closing of the valves 124 and 125 of the cold water coil 122 and the hot water coil 123 based on the return air temperature. Control the degree.

  The return air humidity sensor 20 detects the humidity of the return air as an index for controlling the latent heat control unit 12, and the first and second desiccant rotor ventilation control dampers of the second path switching device based on the humidity of the return air. 151, 152 is controlled to open / close, the operation of the desiccant rotor 102 is started, stopped, or the number of rotations is controlled, and the valves 107, 108, 109 of the cold / hot water coil 101, the vaporizing humidifier 103, and the hot water coil 104 are controlled to open / close. Control the opening.

  In this embodiment, the enthalpy measuring means for measuring the enthalpy of the outside air as a control index of the first path switching device includes an outside air temperature sensor 301 for measuring the temperature of the outside air and an outside air humidity sensor 302 for measuring the humidity of the outside air.

The outside air temperature sensor 301 and the outside air humidity sensor 302 are connected to the first total heat exchanger ventilation control damper 202 and the second total heat exchanger ventilation control damper 203, respectively.
The control units of the first total heat exchanger aeration control damper 202 and the second total heat exchanger aeration control damper 203 receive the measured values of the outside air temperature sensor 301 and the outside air humidity sensor 302 and calculate the enthalpy of the outside air. In addition, the opening / closing operation is controlled in comparison with a preset enthalpy.

  In the present embodiment described above, the pre-filters 8 and 11, the medium-performance filter 121, and the outside air fan 9 are not necessarily required and are installed as necessary, and the hot water coil 104 is basically operated in the cooling mode. However, when the dehumidifying capacity due to the pre-cooling of the cold / hot water coil 101 is insufficient, it acts as a return air preheating unit that heats the return air that is vented to the desiccant rotor 102, and the desiccant rotor 102 is heated and regenerated to increase the dehumidifying capacity. It performs the backup function to ensure.

Hereinafter, the operation of the above-described configuration will be described. The basic operation of the low temperature regeneration desiccant air conditioner of the present embodiment is as follows. That is, the latent heat (humidity) of the outside air flowing through the outside air path 6 is controlled by the latent heat control unit 10 before the return air mixing through which the return air merges through the return air return path 21, and the outside air including the return air after the return air mixing The sensible heat (temperature) is controlled by the sensible heat control unit 12 to supply air into the room, and the return air from the room is exhausted through the latent heat control unit 10.
That is, the latent heat control unit 10 controls the humidity of the outside air taken into the room to process the latent heat load in the room, and the sensible heat control unit 12 controls the temperature of the mixed air of the outside air and the return air to thereby sensible heat in the room. Handle the load. In this way, by separately processing the indoor latent heat load and the sensible heat load, the accuracy of indoor temperature and humidity control is increased, and energy is not wasted.

(At peak cooling)
1 and 4, the operation at the peak time of cooling when the enthalpy of the outside air in the cooling mode is higher than the enthalpy of the set value and the return air humidity is high will be described.

  The control units of the first total heat exchanger aeration control damper 202 and the second total heat exchanger aeration control damper 203 receive the measured values of the outside air temperature sensor 301 and the outside air humidity sensor 302 and calculate the enthalpy of the outside air. To do.

The control unit controls the opening / closing operation of the damper by comparing the calculated enthalpy of the outside air with the preset enthalpy of the set value.
When the enthalpy of the outside air OA is higher than the enthalpy of the set value, the first total heat exchanger aeration control damper 202 is closed and the second total heat exchanger aeration control damper 203 is opened.

  The control units of the first desiccant rotor ventilation control damper 151 and the second desiccant rotor ventilation control damper 152 compare the measured value of the return air humidity sensor 20 with a preset return air humidity to open and close the damper. To control.

  When the humidity of the return air RA is higher than the set humidity, the first desiccant rotor ventilation control damper 151 is closed and the second desiccant rotor ventilation control damper 152 is opened.

  At the peak of cooling, the outside air OA is cooled by the total heat exchanger 200 and the cold / hot water coil 101, and the return air RA is mixed with the outside air OA that has passed through the latent heat control unit 10 through the return path 21 of the return air RA. The outside air OA after the return air mixture is passed through the sensible heat control unit 12 and cooled by the cold water coil 122, the sensible heat is processed by controlling the sensible heat (temperature), and the supply air that has passed through the sensible heat control unit 12 By supplying the SA into the room, the total heat exchanger 200 can reduce the heat load of the outside air to save energy, and the desiccant rotor 102 dehumidifies the operation to minimize the capacity of the cold / hot water coil 101. Can be realized.

  That is, the outside air OA is cooled by the total heat exchanger 200 to reduce the temperature and humidity, and then cooled by the cold / hot water coil 101 to reduce the dry bulb temperature and absolute humidity. The pre-cooled outside air OA passes through the outside air path side of the desiccant rotor 102, the desiccant rotor 102 sorbs and dehumidifies the humidity of the outside air OA, and the absolute humidity is reduced to control latent heat (humidity). The desiccant rotor 102 regenerates the moisture by desorbing the return air RA on the return air path side. For this reason, the energy of the return air RA can be effectively used as the regeneration energy of the desiccant rotor 102, and the desiccant rotor 102 can be regenerated without requiring heating by a separate heat source, thereby saving energy.

The latent heat control unit 10 and the sensible heat control unit 12 control the humidity of the return air RA detected by the return air humidity sensor 20 and the temperature of the return air RA detected by the return air temperature sensor 19 as indexes.
That is, the return air humidity sensor 20 detects the humidity of the return air RA as an index for controlling the latent heat control unit 10, and controls opening / closing or opening of the valve 107 of the cold / hot water coil 101 based on the humidity of the return air RA. The amount of dehumidification is controlled by controlling the flow rate of cold water, and the absolute humidity of the air supplied to the room is controlled.

The return air temperature sensor 19 detects the temperature of the return air RA as an index for controlling the sensible heat control unit 12 and controls the opening / closing or opening of the valve 124 of the cold water coil 122 based on the temperature of the return air RA. The flow rate of cold water is controlled, and the temperature of air supplied to the room is controlled.
Thus, the combined use of the total heat exchanger 200, the cold / hot water coil 101, and the desiccant rotor 102 reduces the energy consumed by the cold / hot water coil 101, while reducing the dry air temperature and the absolute humidity OA to the desiccant. The rotor 102 can be vented.

(Interim period)
2 and 5, the case where the enthalpy of the outside air OA in the cooling mode is lower than the set value enthalpy and the humidity of the return air RA is high will be described.

  When the enthalpy of the outside air OA is lower than the enthalpy of the set value, the first total heat exchanger ventilation control damper 202 is opened, and the second total heat exchanger ventilation control damper 203 is closed.

  When the humidity of the return air RA is higher than the set humidity, the first desiccant rotor ventilation control damper 151 is closed and the second desiccant rotor ventilation control damper 152 is opened.

In the cooling mode in the intermediate period, by performing dehumidification with the desiccant rotor 102, an operation with the capability of the cold / hot water coil 101 minimized can be realized.
That is, the outside air OA ventilated to the desiccant rotor 102 is cooled by the cold / hot water coil 101, and the dry bulb temperature and absolute humidity are reduced. The pre-cooled outside air OA passes through the outside air path side of the desiccant rotor 102, the desiccant rotor 102 sorbs and dehumidifies the humidity of the outside air OA, and the absolute humidity is reduced to control latent heat (humidity). The desiccant rotor 102 regenerates the moisture by desorbing the return air RA on the return air path side. For this reason, the energy of the return air RA can be effectively used as the regeneration energy of the desiccant rotor 102, and the desiccant rotor 102 can be regenerated without requiring heating by a separate heat source, thereby saving energy.

  Then, the return air RA is mixed with the outside air OA that has passed through the latent heat control unit 10 through the return path 21 of the return air, and the outside air OA after the return air mixing is ventilated to the sensible heat control unit 12 and cooled by the cold water coil 122, The sensible heat (temperature) is controlled to process the sensible heat load, and the supply air SA that has passed through the sensible heat control unit 12 is sent into the room.

The latent heat control unit 10 and the sensible heat control unit 12 control the humidity of the return air RA detected by the return air humidity sensor 20 and the temperature of the return air RA detected by the return air temperature sensor 19 as indexes.
That is, the return air humidity sensor 20 detects the humidity of the return air RA as an index for controlling the latent heat control unit 10, and controls opening / closing or opening of the valve 107 of the cold / hot water coil 101 based on the humidity of the return air RA. Thus, the flow rate of the cold water is controlled to control the dehumidification amount, the operation of the desiccant rotor 102 is started, stopped or rotated based on the humidity of the return air RA, and the absolute humidity of the air supplied to the room is controlled.

  The return air temperature sensor 19 detects the temperature of the return air RA as an index for controlling the sensible heat control unit 12, and controls the valve 124 of the chilled water coil 122 to open / close or control the opening degree based on the temperature of the return air RA. The flow rate of the air is controlled, and the temperature of the air supplied to the room is controlled.

Then, the cold water coil 122 and the hot water coil 123 perform dehumidification cooling and reheat control. When the relative humidity of the return air RA detected by the return air humidity sensor 20 falls within the set value + 10%, the operation of the desiccant rotor 102 and the cold / hot water coil 101 is resumed. By this operation control, energy loss in the desiccant rotor 102 can be reduced.
Thus, by using the desiccant rotor 102 and the cold / hot water coil 101, the indoor conditions of high temperature and low humidity can be realized without supercooling.
When the dehumidifying capacity due to the pre-cooling of the cold / hot water coil 101 is insufficient, the desiccant rotor 102 is heated and regenerated by heating the return air RA with the hot water coil 104 and ventilating the desiccant rotor 102 to ensure the dehumidifying capacity.

(Heating mode)
The operation in the heating mode will be described with reference to FIGS. In the heating mode, the first total heat exchanger ventilation control damper 202 is closed, the second total heat exchanger ventilation control damper 203 is opened, and the first desiccant rotor ventilation control damper 151 is opened. The closing operation is performed, and the second desiccant rotor ventilation control damper 152 is opened.

In this heating mode, by regenerating the desiccant rotor 102 with the cold / hot water coil 101, the moisture absorbed from the return air RA can be used for humidification on the air supply side.
That is, the outside air OA that is ventilated to the desiccant rotor 102 is heated by the cold / hot water coil 101. The preheated outside air OA passes through the outside air path side of the desiccant rotor 102, is regenerated by desorbing moisture from the desiccant rotor 102 with the outside air OA, and humidifies the outside air OA. The desiccant rotor 102 sorbs moisture from the return air RA on the return air path side. Thus, the amount of water used for humidification can be reduced by transferring the moisture from the room to the outside air OA.

  Then, the return air RA is mixed with the outside air OA that has passed through the latent heat control unit 10 through the return path 21 of the return air, the outside air OA after the return air mixing is passed through the sensible heat control unit 12 and heated by the hot water coil 123, The sensible heat (temperature) is controlled to process the sensible heat load, and the supply air SA that has passed through the sensible heat control unit 12 is sent into the room.

The latent heat control unit 10 and the sensible heat control unit 12 control the humidity of the return air RA detected by the return air humidity sensor 20 and the temperature of the return air RA detected by the return air temperature sensor 19 as indexes.
That is, the return air humidity sensor 20 detects the humidity of the return air RA as an index for controlling the latent heat control unit 10, and controls the opening / closing or opening degree of the valve 107 of the cold / hot water coil 101 based on the humidity of the return air RA. Then, the heating is adjusted by controlling the flow rate of the hot water, the amount of humidification in the desiccant rotor 102 is controlled, and the operation of the desiccant rotor 102 is started, stopped, or the number of revolutions is controlled based on the humidity of the return air RA. Control the absolute humidity of the supplied air. When humidification is insufficient, the outside air OA is humidified by the vaporizing humidifier 103.

  The return air temperature sensor 19 detects the temperature of the return air RA as an index for controlling the sensible heat control unit 12, and controls the valve 125 of the hot water coil 123 to open / close or open based on the temperature of the return air RA. The flow rate of the air is controlled, and the temperature of the air supplied to the room is controlled.

  In the above-described embodiment, the return air return path 21 is provided in order to secure the air volume necessary for processing the indoor load, and the outside air OA and the return air RA are mixed. In the case where the indoor sensible heat load can be covered or a separate air conditioner is provided, the return air return path 21 may not be provided.

  In the embodiment described above, the return air temperature sensor 19 and the return air humidity sensor 20 are provided in the return air duct 18, but may be provided in the return air path 7 in the casing 1 or in the room of the managed space. Good.

DESCRIPTION OF SYMBOLS 1 Casing 2 Outside air port 3 Air supply port 4 Return air port 5 Exhaust port 6 Outside air path 7 Return air path 8 Prefilter 9 Outside air fan 10 Latent heat control part 11 Prefilter 12 Sensible heat control part 13 Supply air fan 14 Supply air duct 16 Pre-filter 17 Exhaust fan 18 Return air duct 19 Return air temperature sensor 20 Return air humidity sensor 21 Return air return path 22 Return air damper 101 Cold / hot water coil 102 Desiccant rotor 103 Evaporative humidifier 104 Hot water coils 107, 108, 109, 124, 125 Valve 121 Medium performance filter 122 Cold water coil 123 Hot water coil 150 Desiccant rotor bypass path 151 First desiccant rotor ventilation control damper 152 Second desiccant rotor ventilation control damper 200 Total heat exchanger 201 Total heat exchanger bypass Path 202 first total heat exchange Ventilation control damper 203 Second total heat exchanger ventilation control damper 301 Outside temperature sensor 302 Outside air humidity sensor

Claims (8)

An outside air path for supplying outside air to the room, a return air path for exhausting the return air from the room, a latent heat control unit for controlling the latent heat of the outside air in the outside air path, and a sensible heat for controlling the sensible heat of the outside air in the outside air path A control unit and a total heat exchanger unit that exchanges sensible heat and latent heat between outside air and return air,
The total heat exchanger unit is a total heat exchanger that exchanges sensible heat and latent heat between the outside air in the outside air path that vents to the latent heat control unit and the return air in the return air path that passes through the latent heat control unit. A first heat exchanger bypass path that communicates with the outside air path upstream and downstream of the heat exchanger to bypass the total heat exchanger, and an outside air path that passes through the total heat exchanger, and a first heat exchanger bypass path. Having a route switching device,
The latent heat control unit cools the desiccant rotor that sorbs moisture from the outside air in the outside air path and desorbs the moisture by return air on the return air path side, and cools the outside air that is vented to the desiccant rotor during cooling. A cold / hot water coil that heats the outside air that is vented to the rotor, a desiccant rotor bypass path that communicates with the outside air path upstream and downstream of the desiccant rotor and bypasses the desiccant rotor, and an outside air path and a desiccant rotor bypass path that passes through the desiccant rotor A second path switching device that switches between
An enthalpy measuring means for measuring the enthalpy of outside air as a control index of the first path switching device;
A low-temperature regeneration desiccant air conditioner comprising a return air humidity sensor for detecting the return air humidity as a control index of the second path switching device.   The low-temperature regeneration desiccant air conditioner according to claim 1, wherein the latent heat control unit includes a return air preheating unit that heats the return air that flows to the desiccant rotor.   The low-temperature regeneration desiccant air conditioner according to claim 1 or 2, wherein the latent heat control unit includes an outside air humidifying unit that humidifies outside air that has passed through the desiccant rotor.   The low-temperature regeneration desiccant air conditioner according to any one of claims 1 to 3, further comprising a return air return path communicating with the return air path and the outside air path downstream of the latent heat control unit.   The latent heat of the outside air supplied into the room is controlled by the latent heat control unit, the sensible heat of the outside air that has passed through the latent heat control unit is controlled by the sensible heat control unit, and the outside air that has passed through the sensible heat control unit is supplied into the room, The return air from the room is exhausted through the latent heat control unit, and the sensible heat and latent heat are exchanged between the outside air that is vented to the latent heat control unit by the total heat exchanger and the return air that has passed through the latent heat control unit. By measuring the enthalpy of the outside air and operating the first path switching device using the enthalpy of the outside air as a control index, total heat exchange is established between the outside air path on the upstream side of the total heat exchanger and the outside air path on the downstream side. Switching between the total heat exchanger bypass path that bypasses the heat exchanger and the outside air path that passes through the total heat exchanger, and operating the second path switching device using the return air humidity as a control index, thereby allowing the outside air upstream of the desiccant rotor to operate. Path and downstream outside air path Low temperature desiccant air conditioner method operation and switches the desiccant rotor bypass path bypassing the desiccant rotor communicates, and outside air path through the desiccant rotor.   When the enthalpy of the outside air is higher than the set enthalpy during cooling and the return air humidity is higher than the set humidity, the first path switching device is operated to select the outside air path through the total heat exchanger, and the second The operating method of the low-temperature regeneration desiccant air conditioner according to claim 5, wherein an outside air path passing through the desiccant rotor is selected by operating the path switching device.   When the enthalpy of the outside air during cooling is lower than the set enthalpy and the return air humidity is higher than the set humidity, the first path switching device is operated to select the total heat exchanger bypass path, and the second path The operating method of the low-temperature regeneration desiccant air conditioner according to claim 5, wherein the switching device is operated to select an outside air path passing through the desiccant rotor.   During heating, the first path switching device is operated to select the outside air path passing through the total heat exchanger, and the second path switching device is operated to select the outside air path passing through the desiccant rotor. The operating method of the low-temperature regeneration desiccant air conditioner according to claim 5.

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