JP2011242117A - Low temperature regenerative desiccant air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low temperature regenerative desiccant air conditioner that controls a latent heat load and a sensible heat load separately, and shows high accuracy in control of room temperature and humidity to allow no waste of energy.SOLUTION: A latent heat controller 10 includes: a desiccant rotor 102 for absorbing moisture from external air at an external air passage side, and desorbing the moisture at a return air passage side by returning air for regeneration; a cool temperate water coil 101 for cooling external air which is to be ventilated to the desiccant rotor 102; and a return air humidity sensor 20 for detecting the humidity of return air serving as an index for controlling the latent heat controller 10.

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, there is one described in Patent Document 1. This device includes an evaporator and a regenerative moisture exchanger, and controls the temperature and humidity of the air supplied to the managed space. In this device, the supply air is cooled and dehumidified by passing through an evaporator and further dehumidified by passing through a rotating regenerative moisture exchanger.

JP-A-61-2228234

  However, in the above-described configuration, the temperature and humidity of the air supplied to the managed space are controlled by a cooler during cooling, so the temperature and humidity of the air cannot be individually controlled. Since the temperature and humidity of the air are controlled by the exchanger, humidification cannot be performed sufficiently, and the humidity of the air supplied to the managed space is insufficient. For this reason, it is difficult to simultaneously realize a comfortable temperature and a comfortable humidity.

  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, the low temperature regeneration desiccant air conditioner of the present invention has 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. The outside air is supplied into the room through the head and the sensible heat control unit, and the return air from the room is exhausted through the latent heat control unit. The latent heat control unit sorbs and returns moisture from the outside air on the outside air path side. A desiccant rotor that desorbs and regenerates moisture by return air on the air path side, an external air precooling unit that cools the outside air that is vented to the desiccant rotor, and a return air that detects the humidity of the return air as an index for controlling the latent heat control unit A humidity sensor is provided.

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.
The low-temperature regeneration desiccant air conditioner of the present invention has 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 the outside air passes through the latent heat control unit and the sensible heat control unit. Is supplied to the room, and the return air from the room is exhausted through the latent heat control unit. The latent heat control unit sorbs moisture from the return air on the return air path side, and the outside air on the outside air path side causes moisture to be absorbed by the outside air. A desiccant rotor that desorbs and regenerates, an outside air preheating part that heats the outside air that is vented to the desiccant rotor, and a return air humidity sensor that detects the humidity of the return air as an index for controlling the latent heat control part. To do.

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 in that it has a return air return path that connects the return air path and the outside air path downstream of the latent heat control unit.

  In the low-temperature regeneration desiccant air conditioner according to the present invention, the latent heat control unit includes a bypass path that communicates the upstream side and the downstream side of the desiccant rotor in the outside air path, and a bypass damper provided in the bypass path.

  In the low-temperature regeneration desiccant air conditioner of the present invention, the total heat that exchanges sensible heat and latent heat between the outside air that is vented to the latent heat control unit on the outside air path side and the return air that has passed through the latent heat control unit on the return air path side An exchange is provided.

  In the low-temperature regeneration desiccant air conditioner of the present invention, a total heat exchanger bypass path that communicates with the external air path upstream and downstream of the total heat exchanger and bypasses the total heat exchanger, and an external air path that passes through the total heat exchanger And a first path switching device that switches between the heat exchanger bypass path and the total heat exchanger bypass path, and communicates with the outside air path on the downstream side of the outside air precooling section and on the upstream side of the desiccant rotor, and communicates with the outside air path on the downstream side of the desiccant rotor. And a second path switching device that switches between a desiccant rotor bypass path that bypasses the desiccant rotor and an outside air path that passes through the desiccant rotor and a desiccant rotor bypass path.

  The low-temperature regeneration desiccant air conditioner of the present invention is characterized by comprising enthalpy measuring means for measuring the enthalpy of outside air as a control index of the first path switching device and the second path switching device.

  The operation method of the low-temperature regeneration desiccant air conditioner of the present invention controls the latent heat of the outside air flowing into the system by the latent heat control unit, controls the sensible heat of the outside air that has passed through the latent heat control unit by the sensible heat control unit, The outside air that has passed through the control unit is supplied to the room and the return air from the room is exhausted through the latent heat control unit. The outside air that is vented to the desiccant rotor of the latent heat control unit is cooled by the outside air precooling unit, and the desiccant rotor The outside air path sorbs and dehumidifies the outside air, and the return air side dehumidifies the dehumidifier with the return air to regenerate the desiccant rotor, and uses the return air humidity detected by the return air humidity sensor as an index for latent heat. The control unit is controlled.

  In the operation method of the low temperature regeneration desiccant air conditioner of the present invention, the humidity of the supply air that has passed through the supply air cooling unit of the sensible heat control unit is detected by the supply air humidity sensor, and the supply air humidity is cooled and dehumidified by the supply air cooling unit. When the humidity is generated, the operation of the desiccant rotor and the outside air precooling section is stopped.

  In the operation method of the low temperature regeneration desiccant air conditioner of the present invention, prior to stopping the operation of the air conditioner, the outside air is ventilated through a desiccant rotor bypass path communicating with the upstream side and the downstream side of the desiccant rotor in the outside air path of the latent heat control unit, It is characterized by operating for a certain period of time with outside air bypassing the desiccant rotor, and then stopping the operation of the air conditioner.

  In the operation method of the low-temperature regeneration desiccant air conditioner of the present invention, sensible heat is generated between the outside air ventilated by the total heat exchanger to the outside air path side of the latent heat control unit and the return air passed through the return air path side of the latent heat control unit. By exchanging latent heat, measuring the enthalpy of the outside air by the enthalpy measuring means, and operating the first path switching device using the enthalpy of the outside air as a control index, the outside air path on the upstream side of the total heat exchanger and the outside air on the downstream side Switching between a total heat exchanger bypass path communicating with the path and bypassing the total heat exchanger and an outside air path passing through the total heat exchanger, and operating the second path switching device using the enthalpy of the outside air as a control index The desiccant rotor bypass path that communicates with the upstream outside air path and the downstream outside air path and bypasses the desiccant rotor, and the outside air path that passes through the desiccant rotor. And switches the.

  In the operation method of the low temperature regeneration desiccant air conditioner of the present invention, when the enthalpy of the outside air during cooling is higher than the set enthalpy, the outside air path passing through the total heat exchanger is selected by operating the first path switching device, Operate the second path switching device to select the desiccant rotor bypass path. If the enthalpy of the outside air is lower than the set enthalpy during cooling, operate the first path switching apparatus to select the total heat exchanger bypass path And operating the second path switching device to select the outside air path passing through the desiccant rotor, operating the first path switching device during heating to select the outside air path passing through the total heat exchanger, and the second The route switching device is operated to select an outside air route 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 higher than the enthalpy of the return air during cooling, the outside air path passing through the total heat exchanger is selected by operating the first path switching device. When the desiccant rotor bypass path is selected by operating the second path switching device, and the enthalpy of the outside air is lower than the enthalpy of the return air during cooling, the first heat switching bypass path is operated by operating the first path switching device. And selecting the outside air path passing through the desiccant rotor by operating the second path switching device, selecting the outside air path passing through the total heat exchanger by operating the first path switching device during heating, The second path switching device is operated to select an outside air path passing through the desiccant 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 / humidity control is increased, and the humidity of the return air is detected by the return air humidity sensor to control the latent heat control unit, so that the accuracy of indoor temperature / humidity control is further 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.

  The first path switching device and the second path switching device are operated using the enthalpy of the outside air as a control index, and the total heat exchanger bypass path and the outside air path passing through the total heat exchanger are switched, and the desiccant rotor bypass path and the desiccant By switching the outside air path passing through the rotor, it is possible to realize an operation that uses the capacity of the cooling device and the heating device without waste by properly using the total heat exchanger and the desiccant rotor.

  When the enthalpy of the outside air during cooling is higher than the set value, 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 can be reduced by the total heat exchanger to realize energy saving.

When the enthalpy of the outside air during cooling is lower than the set value, dehumidifying with a desiccant rotor can minimize the capacity of the cooling device and reduce energy consumption.
At the time of heating, the heat load of outside air is reduced by the total heat exchanger, and the desiccant rotor is regenerated by the heating device, so that moisture absorbed from the return air can be used for humidification on the supply side.

The schematic diagram which shows the structure of the air conditioner in embodiment of this invention. The schematic diagram which shows the driving | running state in the air_conditioning | cooling mode of the air conditioner in the embodiment The schematic diagram which shows the driving | running state of the heating mode of the air conditioner in the embodiment Air diagram of cooling mode of air conditioner in the same embodiment Air diagram of heating mode of air conditioner in the same embodiment The schematic diagram which shows the driving | running state before the stop of the air conditioner in the embodiment The schematic diagram which shows the structure of the air conditioner in other embodiment of this invention, and shows the driving | running state in case the enthalpy of the external air of a cooling mode is higher than a setting value Air diagram when the enthalpy of the outside air in the cooling mode in the embodiment is higher than the set value The schematic diagram which shows the driving | running state in case the enthalpy of the external air of the air conditioner in the air_conditioning | cooling mode in the same embodiment is lower than a setting value Air diagram when the enthalpy of the outside air in the cooling mode in the embodiment is lower than the set value The schematic diagram which shows the driving | running state of the heating mode of the air conditioner in the embodiment Air diagram of heating mode of air conditioner in the same embodiment

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
1 to 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, and here, from the outside air port 2 to the air supply port 3. The ventilation path from the return air port 4 to the exhaust port 5 is described as the return air path 7.

  A pre-filter 8, an outdoor air fan 9, a latent heat control unit 10, a pre-filter 11, a medium performance filter 121, a sensible heat control unit 12, and an air supply fan 13 are interposed in the outside air path 6 sequentially from the upstream side to the downstream side. An air supply humidity sensor 15 is interposed in the air supply duct 14 connected to the air supply port 3.

  A pre-filter 16, a latent heat control unit 10, and an exhaust fan 17 are interposed in the return air path 7 sequentially from the upstream side to the downstream side, and a return air temperature is supplied to the return air duct 18 connected to the return air port 4. A sensor 19 and a return air humidity sensor 20 are interposed. 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 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, and a desiccant rotor bypass path 105 communicating with the upstream side and the downstream side of the desiccant rotor 102 in the outside air path 6, and a desiccant rotor bypass damper 106 provided in the desiccant rotor bypass path 105. It has.

  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 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 return air humidity as an index for controlling the latent heat control unit 12, and based on the return air humidity, each of the valves 107 of the cold / hot water coil 101, the vaporizing humidifier 103, the hot water coil 104, Opening / closing control or opening control is performed on 108 and 109, and starting, stopping, or rotation speed of the operation of the desiccant rotor 102 is controlled based on the humidity of the return air.

  The supply air humidity sensor 15 detects the humidity of the supply air as an index for controlling the latent heat control unit 10, and controls the start, stop, or rotation speed of the desiccant rotor 102 based on the supply air humidity.

  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 is mixed 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.
Cooling Mode The operation in the cooling mode will be described with reference to FIGS. The alphabetical subscripts in each plot in FIG. 4 indicate the positions of the outside air path 6 and the return air path 7 in FIG.

  In the cooling mode, the latent heat control unit processes the latent heat load of the outside air. That is, the outside air 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 precooled outside air 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, and the absolute humidity is reduced to control latent heat (humidity). The desiccant rotor 102 regenerates the moisture by desorbing the return air on the return air path side. For this reason, the energy of the return air can be used effectively 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 is mixed with the outside air that has passed through the latent heat control unit 10 through the return path 21 of the return air, and the outside air after the return air mixing is ventilated to the sensible heat control unit 12 and cooled by the cold water coil 122, and sensible heat ( The sensible heat load is processed by controlling the temperature), and the outside air that has passed through the sensible heat control unit 12 is supplied into the room.

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

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

  The supply air humidity sensor 15 detects the humidity of the supply air as an index for controlling the latent heat control unit 10, and controls the start and stop of the operation of the latent heat control unit 10 based on the humidity of the supply air. That is, when the supply air humidity becomes a humidity at which cooling and dehumidification occurs in the cold water coil 122, for example, when the humidity of the supply air exceeds RH 85%, the cooling water coil 122 performs cooling and dehumidification, and the desiccant rotor 102 performs dehumidification. Since the effect is reduced, the rotation of the desiccant rotor 102 is stopped, and the cold water supply of the cold / hot water coil 101 is stopped. 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 detected by the return air humidity sensor 20 falls within the range of 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.

  As described above, by using the desiccant rotor 102, indoor conditions of high temperature and low humidity (28 ° C., RH 40%) of, for example, 26 ° C. or higher can be realized without supercooling. Further, since the indoor load is sensible heat cooled with a dry coil, sanitary air can be supplied indoors.

  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 with the hot water coil 104 and ventilating the desiccant rotor 102 to ensure the dehumidifying capacity.

At the end of the cooling operation of the low-temperature regeneration desiccant air conditioner, as shown in FIG. 6, the upstream side and the downstream side of the desiccant rotor 102 in the outside air path 6 of the latent heat control unit 10 are communicated with each other by the desiccant rotor bypass path 105 before stopping. The outside air is bypassed, the outside air bypasses the processing side of the desiccant rotor 102, the return air is ventilated to the regeneration side of the desiccant rotor 102, and the air is operated after the desiccant rotor 102 is dried. By stopping, generation of mold can be prevented.
Heating Mode Operation in the heating mode will be described with reference to FIGS. 3 and 5. The alphabetical subscripts in each plot in FIG. 5 indicate the positions of the outside air path 6 and the return air path 7 in FIG.

  In the heating mode, the latent heat control unit processes the latent heat load of the outside air. In other words, the outside air that is ventilated to the desiccant rotor 102 is heated by the cold / hot water coil 101. The preheated outside air passes through the outside air path side of the desiccant rotor 102, is regenerated by desorbing moisture from the desiccant rotor 102 with outside air, and humidifies the outside air. The desiccant rotor 102 sorbs moisture from the return air on the return air path side. In this way, the amount of water used for humidification can be reduced by transferring moisture from the room to the outside air.

  Then, the return air is mixed with the outside air that has passed through the latent heat control unit 10 through the return path 21 of the return air, the outside air after the return air mixing is passed through the sensible heat control unit 12 and heated by the hot water coil 123, and sensible heat ( The sensible heat load is processed by controlling the temperature), and the outside air that has passed through the sensible heat control unit 12 is supplied into the room.

The latent heat control unit 10 and the sensible heat control unit 12 control the return air humidity detected by the return air humidity sensor 20 and the return air temperature detected by the return air temperature sensor 19 as indexes.
That is, the return air humidity sensor 20 detects the return air humidity as an index for controlling the latent heat control unit 10, and controls the valve 107 of the chilled / hot water coil 101 to open / close or control the opening degree based on the return air humidity. The amount of air supplied to the room is controlled by adjusting the heating to control the amount of humidification in the desiccant rotor 102 and controlling the start, stop, or rotation speed of the desiccant rotor 102 based on the return air humidity. Control absolute humidity. When the humidification is insufficient, the outside air is humidified by the vaporizing humidifier 103.

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

  In the embodiment described above, the return air return path 21 is provided in order to secure the air volume necessary for processing the indoor sensible heat load, and the outside air and the return air 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.
(Embodiment 2)
The low-temperature regeneration desiccant air conditioner of the present invention may have a configuration in which the total heat exchanger 200 is disposed on the outside air side of the latent heat control unit as shown in FIGS. 7, 9, and 11. That is, the total heat exchanger 200 that 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 is disposed. The total heat exchanger 200 includes a rotary type and a static type, but any form may be used.

  A total heat exchanger bypass path 201 that communicates with the outside air path 6 on the upstream side and the downstream side of the total heat exchanger 200 to bypass the total heat exchanger 200 is provided, and the outside air path 6 that passes through the total heat exchanger 200 and First and second total heat exchanger bypass dampers 202 and 203 forming a first path switching device for switching between the total heat exchanger bypass path 201 are provided. The first total heat exchanger bypass damper 202 is interposed in the total heat exchanger bypass path 201, and the second total heat exchanger bypass damper 203 is upstream of the total heat exchanger 200 and performs total heat exchange. It is interposed in the outdoor air path 6 on the downstream side of the branch point of the bypass passage 201.

  A desiccant rotor bypass path 150 that communicates with the outside air path 6 downstream of the cold / hot water coil 101 and upstream of the desiccant rotor 102 and that communicates with the outside air path 6 downstream of the desiccant rotor 102 and bypasses the desiccant rotor 102. The first and second desiccant rotor bypass dampers 151 and 152 forming a second path switching device that switches between the outside air path 6 passing through the desiccant rotor 102 and the desiccant rotor bypass path 150 are provided.

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

  An enthalpy measuring means for measuring the enthalpy of the outside air is provided as a control index of the first path switching device and the second path switching device. In this embodiment, the outside temperature sensor 301 for measuring the temperature of the outside air as the enthalpy measuring means. 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 respectively a first total heat exchanger bypass damper 202, a second total heat exchanger bypass damper 203, a first desiccant rotor bypass damper 151, and a second desiccant rotor bypass damper. 152 is connected.

  The control units of the first total heat exchanger bypass damper 202, the second total heat exchanger bypass damper 203, the first desiccant rotor bypass damper 151, and the second desiccant rotor bypass damper 152 are the outside air temperature sensor 301 and the outside air. The measurement value of the humidity sensor 302 is received to calculate the enthalpy of the outside air, and the opening / closing operation is controlled by comparison with a preset enthalpy.

  In the present embodiment, the enthalpy of the outside air is compared with the enthalpy of the set value. However, in addition to the outside air temperature sensor 301 and the outside air humidity sensor 302, the return air temperature sensor 19 and the return air humidity sensor 20 are respectively connected to the first total heat exchanger bypass damper 202 and the second total heat exchanger bypass damper 203. The first desiccant rotor bypass damper 151 and the second desiccant rotor bypass damper 152 may be connected to each other.

  In this configuration, the outside air temperature is controlled in the control unit of the first total heat exchanger bypass damper 202, the second total heat exchanger bypass damper 203, the first desiccant rotor bypass damper 151, and the second desiccant rotor bypass damper 152. The enthalpy of the outside air is calculated by receiving the measurement values of the sensor 301 and the outside air humidity sensor 302, and the enthalpy of the return air is calculated by receiving the measurement values of the return air temperature sensor 19 and the return air humidity sensor 20. Compares the enthalpy of the outside air and controls the opening and closing operation.

  The first total heat exchanger bypass damper 202, the second total heat exchanger bypass damper 203, the first desiccant rotor bypass damper 151, and the second desiccant rotor bypass damper 152 are opened and closed using the enthalpy of the outside air as a control index. Then, the total heat exchanger bypass path 201 and the outside air path 6 passing through the total heat exchanger 200 are switched, and the total heat exchanger 200 is switched by switching between the desiccant rotor bypass path 150 and the outside air path 6 passing through the desiccant rotor 102. And the desiccant rotor 102 can be used properly, and the operation of using the capacity of the cold / hot water coil 101 etc. without waste can be realized.

  The operation in the cooling mode will be described with reference to FIGS. For example, in the cooling mode, when the enthalpy of the outside air during cooling is higher than the enthalpy of the set value or the return air, the first total heat exchanger bypass damper 202 is closed and the second total heat exchanger bypass damper is closed. 203 is opened, the first desiccant rotor bypass damper 151 is opened, and the second desiccant rotor bypass damper 152 is closed.

  For this reason, outside air OA can pass through the cold / hot water coil 101 of the latent heat control part 10 in the state by which the heat load was reduced by the total heat exchanger 200, can reduce the energy consumption of the cold / hot water coil 101, and can implement | achieve energy-saving, By not passing through the desiccant rotor 102, loss of sensible heat transfer by the desiccant rotor 102 can be avoided, and a disadvantageous factor that the enthalpy of the outside air during cooling is higher than the enthalpy of the set value or the return air can be eliminated.

  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 cooled by the cold water coil 122, and sensible heat The sensible heat load is processed by controlling the (temperature), and the supply air SA that has passed through the sensible heat control unit 12 is supplied into the room. Other functions and effects are the same as those of the previous embodiment, and a description thereof will be omitted.

  In the cooling mode, as shown in FIGS. 9 and 10, when the enthalpy of the outside air during cooling is lower than the enthalpy of the set value or the enthalpy of the return air, the first total heat exchanger bypass damper 202 is opened, The second total heat exchanger bypass damper 203 is closed, the first desiccant rotor bypass damper 151 is closed, and the second desiccant rotor bypass damper 152 is opened.

  For this reason, outside air OA avoids the total heat exchanger 200, passes through the cold / hot water coil 101 of the latent heat control unit 10, and is dehumidified by the desiccant rotor 102. Therefore, by making the best use of the advantage that the enthalpy of the outside air during cooling is lower than the enthalpy of the set value or the return air, the operation of minimizing the capacity of the cold / hot water coil 101 is realized.

  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 vented to the sensible heat control unit 12 to suppress the energy consumption of the cold water coil 122. While controlling the sensible heat (temperature), the sensible heat load is processed, and the supply air SA that has passed through the sensible heat control unit 12 is sent into the room. Other functions and effects are the same as those of the previous embodiment, and a description thereof will be omitted.

  In the heating mode, as shown in FIGS. 11 and 12, the first total heat exchanger bypass damper 202 is closed, the second total heat exchanger bypass damper 203 is opened, and the first desiccant rotor is operated. The bypass damper 151 is closed and the second desiccant rotor bypass damper 152 is opened.

  The outside air OA is heated by the total heat exchanger 200, passes through the cold / hot water coil 101, is heated while suppressing energy consumption by the cold / hot water coil 101, and is humidified by the desiccant rotor 102. By regenerating the desiccant rotor 102 with the outside air OA heated by the cold / hot water coil 101, the moisture absorbed from the return air RA can be used for humidification on the supply side.

  The return air RA is mixed with the outside air OA that has passed through the latent heat control unit 10 through the return air return path 21, and the outside air OA after the return air mixing is passed to the sensible heat control unit 12 to control the sensible heat (temperature). The sensible heat load is processed, and the supply air SA that has passed through the sensible heat control unit 12 is supplied into the room. Other functions and effects are the same as those of the previous embodiment, and a description thereof will be omitted.

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 15 Supply air humidity sensor 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 Vaporizing humidifier 104 Hot water coil 105 Desiccant rotor bypass path 106 Desiccant rotor bypass damper 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 bypass damper 152 Second desiccant Rotor bypass damper 200 total heat exchanger 201 total heat exchanger bypass path 202 first total enthalpy heat exchanger bypass damper 203 second total heat exchanger bypass damper 301 ambient temperature sensor 302 outdoor air humidity sensor

Claims (15)

It has 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 supplies the outside air to the room through the latent heat control unit and the sensible heat control unit. The return air is exhausted through the latent heat control unit,
The latent heat control unit includes a 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, an outside air precooling unit that cools the outside air that is vented to the desiccant rotor, A low-temperature regeneration desiccant air conditioner comprising a return air humidity sensor that detects the return air humidity as an index for controlling the latent heat control unit.   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. It has 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 supplies the outside air to the room through the latent heat control unit and the sensible heat control unit. The return air is exhausted through the latent heat control unit,
The latent heat control unit is a desiccant rotor that sorbs moisture from the return air on the return air path side and regenerates the moisture by desorbing the outside air on the outside air path side, an outside air preheating part that heats the outside air that is vented to the desiccant rotor, A low-temperature regeneration desiccant air conditioner comprising a return air humidity sensor that detects the return air humidity as an index for controlling the latent heat control unit.   The low-temperature regeneration desiccant air conditioner according to claim 3, 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 claim 1 or 3, further comprising a return air return path that communicates the return air path and the outside air path downstream of the latent heat control unit.   4. The low-temperature regeneration desiccant air conditioner according to claim 1, wherein the latent heat control unit includes a bypass path communicating between the upstream side and the downstream side of the desiccant rotor in the outside air path, and a bypass damper provided in the bypass path. .   A total heat exchanger for exchanging sensible heat and latent heat between outside air ventilating to the latent heat control unit on the outside air path side and return air passing through the latent heat control unit on the return air path side is provided. Item 7. The low temperature regeneration desiccant air conditioner according to any one of Items 1 to 6.   Switching between the total heat exchanger bypass path that bypasses the total heat exchanger by communicating with the external air path on the upstream side and the downstream side of the total heat exchanger, and the external air path that passes through the total heat exchanger and the total heat exchanger bypass path A desiccant rotor bypass that communicates with an external air path downstream of the first air switching unit and upstream of the desiccant rotor and that communicates with the external air path downstream of the desiccant rotor and bypasses the desiccant rotor. The low-temperature regeneration desiccant air conditioner according to claim 7, further comprising a second path switching device that switches a path, an outside air path passing through the desiccant rotor, and a desiccant rotor bypass path.   The low-temperature regeneration desiccant air conditioner according to claim 8, further comprising enthalpy measuring means for measuring enthalpy of outside air as a control index of the first path switching device and the second path switching device. The latent heat of the outside air flowing into the system 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, Exhaust the return air from the room through the latent heat control unit,
The outside air ventilated to the desiccant rotor of the latent heat control unit is cooled by the outside air pre-cooling unit, the moisture of the outside air is sorbed and dehumidified on the outside air path side of the desiccant rotor, and the desiccant is desorbed by returning air on the return air path side. A method for operating a low-temperature regeneration desiccant air conditioner, comprising: regenerating a rotor; and controlling a latent heat control unit using a return air humidity detected by a return air humidity sensor as an index.   The humidity of the supply air that has passed through the supply air cooling unit of the sensible heat control unit is detected by the supply air humidity sensor, and the desiccant rotor and the outside air pre-cooling unit when the supply air humidity is the humidity at which cooling and dehumidification occurs in the supply air cooling unit The operation | movement method of the low-temperature reproduction | regeneration desiccant air conditioner of Claim 10 characterized by the above-mentioned.   Prior to the shutdown of the air conditioner, the outside air is ventilated through the desiccant rotor bypass path that communicates the upstream side and downstream side of the desiccant rotor in the outside air path of the latent heat control unit, and the system is operated for a certain period of time with the outside air bypassing the desiccant rotor. The operation method of the low-temperature regeneration desiccant air conditioner according to claim 10, wherein the air conditioner is then stopped.   The sensible heat and latent heat are exchanged between the outside air vented to the outside air path side of the latent heat control unit by the total heat exchanger and the return air passed through the return air path side of the latent heat control unit, and the enthalpy of the outside air is measured by the enthalpy measuring means. By measuring and operating the first path switching device using the enthalpy of the outside air as a control index, the outside air path on the upstream side and the outside air path on the downstream side of the total heat exchanger are communicated to bypass the total heat exchanger. By switching the total heat exchanger bypass path and the outside air path passing through the total heat exchanger, and operating the second path switching device using the enthalpy of the outside air as a control index, the outside air path on the upstream side and the downstream side of the desiccant rotor The low-temperature re-regeneration according to claim 10, wherein the desiccant rotor bypass path that communicates with the outside air path to bypass the desiccant rotor and the outside air path that passes through the desiccant rotor are switched. Operating method of the desiccant air conditioner.   When the enthalpy of outside air is higher than the set enthalpy during cooling, 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 rotor bypass. When the route is selected and the enthalpy of the outside air is lower than the set enthalpy during cooling, the first route switching device is operated to select the total heat exchanger bypass route, and the second route switching device is operated. The outside air path that passes through the desiccant rotor is selected, and during heating, the first path switching device is operated to select the outside air path that passes through the total heat exchanger, and the second path switching device is operated to operate the outside air that passes through the desiccant rotor. The method for operating a low-temperature regeneration desiccant air conditioner according to claim 13, wherein a route is selected.   When the enthalpy of outside air is higher than the enthalpy of return air during cooling, 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 rotor. When the bypass path is selected and the enthalpy of the outside air is lower than the enthalpy of the return air during cooling, the total heat exchanger bypass path is selected by operating the first path switching device and the second path switching device is operated. The outside air path passing through the desiccant rotor is selected. 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 rotor. The operating method of the low-temperature regeneration desiccant air conditioner according to claim 13, wherein an outside air path is selected.

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