JP6057573B2 - Dehumidifying air conditioning method and apparatus - Google Patents

Description

  The present invention relates to a dehumidifying air-conditioning apparatus and method for dehumidifying and air-conditioning indoor air using a desiccant rotor and a heat pump device in combination.

  As a means for adsorbing water vapor in the air and dehumidifying, a desiccant rotor in which an adsorbent is supported on a flat cylindrical body is used. After the water vapor is adsorbed, it is necessary to expose the adsorption region to heated low-humidity regeneration air and release the water vapor with the heat retained in the regeneration air. Therefore, it is necessary to alternately perform the adsorption process and the regeneration. At the time of adsorption of water vapor, heat of adsorption is generated and the temperature of the air to be treated rises, so that a means for cooling the air to be treated is required and a means for preheating the regenerated air is necessary.

Therefore, an air conditioner in which a desiccant rotor and a heat pump device are combined is used. In this air conditioner, the air to be treated that has been heated in the adsorption process is performed by an air cooler that constitutes a part of the heat pump apparatus, and the regeneration air that releases the adsorbed water vapor is preheated by an air heater that constitutes a part of the heat pump apparatus. Yes. Such an air conditioner is known, for example, as disclosed in Patent Document 1.

  On the other hand, in this heat pump device, the discharge pressure of the compressor is controlled for the purpose of improving the operation efficiency. This control is performed, for example, by using an expansion tank and increasing or decreasing the amount of refrigerant flowing through the refrigerant circulation path. Therefore, the refrigerant circulation path and the expansion tank are connected by two branch paths across the expansion valve provided in the refrigerant circulation path, and electromagnetic switching valves are provided in these branch paths, and these electromagnetic switching valves are opened and closed. The amount of refrigerant is increased or decreased.

JP 2001-241893 A

  In an air conditioner that combines a desiccant rotor and a heat pump device, there has been a problem that the refrigerant is insufficient when the compressor rotates at a low speed of around 45 Hz, for example. This often occurs under operating conditions where the cooling load of the air cooler is large and the heating load of the air heater is small. When the heating load is small, that is, when the outlet air temperature set value of the air heater is low, the outlet air temperature is adjusted by decreasing the rotational speed of the compressor. If the cooling load is large at this time, it is necessary to ensure the cooling capacity of the air cooler. However, since the compressor is running at a low speed, an operation for opening the expansion valve and increasing the refrigerant circulation amount is performed. However, the discharge pressure of the compressor is further lowered by opening the expansion valve in addition to the low rotation pressure originally being low.

  Here, in order to return the discharge pressure of the compressor to the set value, a larger amount of refrigerant is required than usual, and in order to eliminate this state, the refrigerant is replenished from the expansion tank. As a result, the electromagnetic on-off valve remains open or the electromagnetic on-off valve is frequently opened and closed, resulting in an unstable operation state. For this reason, there is a problem in that the operating efficiency is lowered, and the electromagnetic on-off valve is worn and the life is shortened.

  In view of the problems of the prior art, the present invention provides a dehumidifying air conditioner that uses a desiccant rotor and a heat pump device in combination, maintaining stable operation and reducing operating efficiency even when the heating load and the cooling load are unbalanced. The purpose is to prevent wear and decrease of the life of the electromagnetic on-off valve.

  In order to achieve this object, the dehumidifying air-conditioning method of the present invention uses a desiccant rotor to adsorb moisture in the air to be treated and dehumidify the air to be treated, and the temperature is raised by heat generated during adsorption in the dehumidifying step. After the air to be treated is cooled by an air cooler that constitutes a part of the heat pump device, the desiccant rotor is supplied with the air to be treated that is supplied to the air-conditioned room, and the regenerated air heated by the air heater that constitutes a part of the heat pump device. It is assumed that a reproduction process for reproduction is performed.

  The method of the present invention includes a first step of adjusting the discharge pressure of the compressor by adjusting the refrigerant storage amount of the expansion tank communicating with the refrigerant circulation path of the heat pump device, and the relative humidity or temperature of the regenerated air at the desiccant rotor inlet. At least one is detected, and the rotational speed of the compressor constituting the heat pump device is controlled so that the temperature of the air to be treated at the outlet of the air cooler becomes a set value and at least one of the relative humidity or temperature becomes the set value. A second step of reducing the compressor discharge pressure set value when the compressor rotation speed does not reach the lower limit threshold and the compressor discharge pressure does not reach the set value exceeds a set time; And a fourth step of increasing the discharge pressure set value of the compressor when the state in which the rotational speed of the compressor exceeds the upper limit threshold exceeds the set time.

  The regeneration effect of the desiccant rotor by the regeneration air is determined by the relative humidity and temperature of the regeneration air. If the relative humidity of the regeneration air is low, the effect of releasing water vapor adsorbed on the desiccant rotor is large. Further, if the temperature of the regeneration air is high, a large release energy can be given to the adsorbed water vapor. If the relative humidity of the regeneration air using outside air is low, such as in winter, the release effect can be increased even if the temperature of the regeneration air is not high.

  In the present invention, the amount of refrigerant circulating in the refrigerant circulation path is adjusted by adjusting the amount of refrigerant stored in the expansion tank, thereby adjusting the discharge pressure of the compressor. Moreover, the rotation speed of the compressor which comprises a heat pump apparatus is controlled so that the to-be-processed air temperature of an air cooler exit may become a set value, and at least one of relative humidity or temperature may become a set value. As a result, the temperature of the air to be treated supplied to the air-conditioned room can be made appropriate, and the regeneration effect of the desiccant rotor can be kept high.

  The cause of the problem is that the balance between the cooling load and the heating load is broken. When the heating load of the air heater is small, the air heater originally does not need to increase the discharge pressure of the compressor any more. From this point of view, the present invention does not regard this as abnormal even if the rotation speed of the compressor does not reach the lower limit threshold and the discharge pressure of the compressor does not reach the set value under the operation control in the second step. When this state lasts beyond the set time, the discharge pressure set value of the compressor is reduced. In this case, it is assumed that the cooling capacity of the air cooler is secured.

  Further, when the state where the rotation speed of the compressor exceeds the upper limit threshold exceeds the set time, an operation for increasing the discharge pressure set value of the compressor is performed. By repeating these operations sequentially, a stable operating state can be maintained. Therefore, it is possible to prevent the opening / closing valve provided in the branch passage communicating with the refrigerant circulation path and the expansion tank from being worn and to reduce the life, and it is not necessary to unnecessarily increase the amount of refrigerant flowing through the refrigerant circulation path. Can be reduced. Furthermore, since the discharge pressure is reduced during the low rotation operation of the compressor, the COP of the heat pump device can be improved.

  In the second step, a first step of detecting the temperature and relative humidity of the regeneration air at the inlet of the air heater, and a second step of calculating the absolute humidity of the regeneration air from the temperature and relative humidity of the regeneration air detected in the first step. And a third step for determining the set temperature of the regeneration air at the desiccant rotor inlet from the absolute humidity calculated in the second step and the relative humidity set value of the regeneration air at the desiccant rotor inlet, The rotation speed and discharge pressure of the compressor may be controlled so that the temperature becomes the set temperature.

  As a result, the relative humidity and temperature of the regeneration air at the inlet of the desiccant rotor can be maintained at the set values, and the optimum conditions for regeneration of the desiccant rotor can be achieved. In addition, since it is not necessary to detect the relative humidity of the regeneration air at the desiccant rotor inlet, and it is sufficient to provide a sensor at the air cooler inlet, it is easy to detect the relative humidity of the regeneration air.

  The dehumidifying air conditioner of the present invention that can be directly used for carrying out the method of the present invention includes a desiccant rotor that adsorbs moisture in the air to be treated and dehumidifies the air to be treated, and a heat pump device having a heat pump cycle component device. It is assumed that the heat pump cycle component device has a compressor provided in the refrigerant circuit, an expansion valve, an air cooler that cools the air to be treated that has been heated during adsorption, and an air heater that heats the regenerated air that regenerates the desiccant rotor. And

  The apparatus of the present invention is further connected to a refrigerant circulation path of the heat pump apparatus via a branch path with an on-off valve, and stores an expansion tank that stores the refrigerant, a first temperature sensor that detects a temperature of air to be treated at the outlet of the air cooler, At least one of detection means for detecting the relative humidity of the regeneration air at the inlet of the desiccant rotor or a second temperature sensor for detecting the temperature of the regeneration air, a rotation speed control device for controlling the rotation speed of the compressor, A timer that measures the duration of the state where the rotation speed does not reach the lower limit threshold and the discharge pressure of the compressor does not reach the set value, and measures the duration of the state where the discharge pressure of the compressor exceeds the upper limit threshold And a compressor so that the temperature of the air to be treated at the outlet of the air cooler becomes a set value, and at least one of the relative humidity or the temperature of the regenerated air for regenerating the desiccant rotor becomes the set value. It controls the rotational speed, when the duration timer has measured exceeds a set time, and a control device for reducing or increasing the discharge pressure setpoint of the compressor.

  In the apparatus of the present invention, while adjusting the discharge pressure of the compressor by adjusting the refrigerant storage amount of the expansion tank, the temperature of the air to be treated at the outlet of the air cooler becomes a set value, and at least one of relative humidity or temperature is The number of rotations of the compressor constituting the heat pump device is controlled so that the set value is obtained. In addition, when the controller does not reach the lower limit threshold value and the compressor discharge pressure does not reach the set value, the compressor discharge pressure set value is reduced when the set time is exceeded. When the state where the rotation speed of the compressor exceeds the upper limit threshold exceeds the set time, the discharge pressure set value of the compressor is increased.

  By repeating these operations sequentially, stable operation can be ensured, and the operation of the on-off valve provided in the branch path connecting the refrigerant circulation path and the expansion tank can be maintained normally. Therefore, it is possible to prevent the opening / closing valve from being worn out and to reduce its life, and it is not necessary to unnecessarily increase the amount of refrigerant flowing through the refrigerant circulation path, so that the amount of refrigerant can be reduced. Furthermore, since the discharge pressure can be reduced during the low-speed operation of the compressor, the COP of the heat pump device can be improved. Furthermore, since the set time is provided by the timer, stable control that is not affected by instantaneous disturbances becomes possible.

  In the device of the present invention, the control device calculates the rotation speed of the compressor in which the temperature of the air to be treated at the outlet of the air cooler becomes a set value and at least one of the relative humidity or the temperature of the regeneration air that regenerates the desiccant rotor becomes the set value. A rotation number calculator, a discharge pressure set value increase / decrease unit that reduces or increases the discharge pressure set value of the compressor when the duration time measured by the timer exceeds a set value, and a rotation speed detection value and discharge of the compressor A discharge pressure set value calculator that calculates the discharge pressure set value of the compressor from the output of the pressure set value increase / decrease unit, and operates the on-off valve based on the discharge pressure set value calculated by the discharge pressure set value calculator, A discharge pressure regulator for controlling the discharge pressure of the compressor may be provided.

  By providing the rotation speed calculator, the temperature of the air to be treated at the outlet of the air cooler and the relative humidity or temperature of the regeneration air at the inlet of the desiccant rotor can be reliably maintained at the set values. In addition, by having the discharge pressure set value increase / decrease unit and the discharge pressure set value calculator, the discharge pressure of the compressor can be reliably reduced in conjunction with the low rotation operation of the compressor.

  According to the present invention, even when the cooling load of the air cooler is large and the heating load of the air heater is small, the heat pump device can be stably operated, and the on-off valve provided in the branch path connecting the refrigerant circulation path and the expansion tank Can be maintained normally, and wear of the on-off valve and a reduction in the service life can be prevented. Further, since the discharge pressure of the compressor can be reduced, the amount of refrigerant can be reduced and the COP of the heat pump device can be improved.

1 is an overall configuration diagram of a dehumidifying air conditioner according to an embodiment of the method and apparatus of the present invention. It is a block diagram of the control system of the dehumidification air conditioner which concerns on the said embodiment. It is a flowchart which shows the operation procedure of the dehumidification air conditioner which concerns on the said embodiment. It is a humid air diagram which shows the relationship between relative humidity, absolute humidity, and dry bulb temperature.

  Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention to that unless otherwise specified.

  An embodiment of the method and apparatus of the present invention will be described with reference to FIGS. FIG. 1 shows a dehumidifying air conditioner 10 according to this embodiment. The air conditioning chamber 12 and the regeneration chamber 14 are juxtaposed via a partition wall 16. The air conditioning chamber 12 is provided with a supply fan 24, and the regeneration chamber 14 is provided with a regeneration fan 36. By these fans, airflows in opposite directions are formed in the air conditioning chamber 12 and the regeneration chamber 14.

  In the air conditioning room 12, the outside air OA is taken in by the supply fan 24, the temperature and humidity of the taken outside air OA are adjusted, and supplied to the air-conditioned room 18 as the air to be treated SA. In the regeneration chamber 14, the outside air OA or the room air RA of the air-conditioned room 18 is taken, the temperature and humidity thereof are adjusted, and the regeneration air DA for regenerating the desiccant rotor 20 is obtained. The air-conditioned room 18 is a space that needs to be kept in a low temperature atmosphere, such as a cargo handling room adjacent to a freezing warehouse for storing frozen foods, a meat carcass demolition processing room, and the like. Used.

  The desiccant rotor 20 is disposed across the air conditioning chamber 12 and the regeneration chamber 14, and rotates around the rotation shaft 20a. The surface of the desiccant rotor 20 is impregnated with, for example, an inorganic adsorbent such as silica gel or zeolite, or a polymer adsorbent. In the air conditioning chamber 12, the desiccant rotor 20 adsorbs and removes water vapor contained in the air SA to be treated. The area where the water vapor has been adsorbed moves to the regeneration chamber 14 where the adsorbed water vapor is released by absorbing the heat retained in the regeneration air DA. The regeneration air DA that has taken in water vapor is discharged to the outside. The desiccant rotor 20 rotates at a low speed of several tens of revolutions per hour by a drive motor (not shown), and continuously repeats adsorption and regeneration.

  Outside air OA is taken into the air conditioning chamber 12 by the supply fan 24. The outside air OA is pre-cooled by the precooler 22 before being taken into the air-conditioning chamber 12, and is dehumidified at a temperature equal to or lower than the dew point. The to-be-processed air SA exiting the precooler 22 is dehumidified by removing water vapor by the desiccant rotor 20. Since heat of adsorption is released when water vapor is adsorbed by the desiccant rotor 20, the air to be treated SA rises in temperature. Therefore, the air to be treated SA is supplied to the air-conditioned room 18 after being cooled by the air cooler 50 on the downstream side of the desiccant rotor 20. A temperature sensor 26 is provided in the outlet side space of the air cooler 50.

  In the regeneration chamber 14, the indoor air RA or the outside air OA of the air-conditioned room 18 is introduced as regeneration air. Usually, the indoor air RA in the air-conditioned room 18 has a lower humidity than the outside air OA, and thus is suitable as the regeneration air. The regeneration air DA introduced into the regeneration chamber 14 is heated by the air heater 46, and the relative humidity is adjusted. A humidity sensor 32 that detects the relative humidity of the temperature sensor 30 and the regeneration air DA is provided in the inlet side space of the air heater 46, and a temperature sensor 34 is provided in the outlet side space of the air heater 46.

  The ability to release the water vapor adsorbed by the desiccant rotor 20 is determined by the temperature and relative humidity of the regeneration air DA. Therefore, the regeneration air DA is heated by the air heater 46 to raise the temperature of the regeneration air DA and reduce the relative humidity. Since the adsorbent impregnated in the desiccant rotor 20 absorbs heat and releases water vapor, the regenerated air DA that has passed through the desiccant rotor is released to the outside as humid air having a lowered temperature.

  The dehumidifying air conditioner 10 is provided with a heat pump device 40 constituting a heat pump cycle. In the configuration of the heat pump device 40, heat pump cycle components such as a compressor 44, an air heater 46, an expansion valve 48, and an air cooler 50 are interposed in the refrigerant circulation path 42. As the refrigerant, CO2 that is in a supercritical state in a high-pressure region and that can heat the regenerated air DA to a high temperature of 80 ° C. or higher by the air heater 46 is used. The branch paths 52 and 54 branch from the refrigerant circulation path 42 at the inlet side portion and the outlet side portion of the expansion valve 48, and the branch paths 52 and 54 are connected to the expansion tank 60. Electromagnetic switching valves 56 and 58 are interposed in the branch paths 52 and 54, respectively.

  The compressor 44 includes a drive motor 44a, an inverter device 62 that controls the rotation speed of the drive motor 44a, a rotation speed sensor 64 that detects the rotation speed of the drive motor 44a, and a discharge that detects the discharge pressure of the compressor 44. A pressure sensor 65 is provided. Detection values of the temperature sensors 26, 30 and 34, the humidity sensor 32, the rotation speed sensor 64 and the discharge pressure sensor 65 are input to the controller 70. Based on these detection values, the controller 70 controls the rotation speed of the compressor 44 so that the relative humidity and temperature of the air cooler outlet side treated air SA and the desiccant rotor inlet side regeneration air become set values. In addition, the controller 70 controls the discharge pressure of the compressor 44 by controlling the opening / closing operation of the electromagnetic opening / closing valves 56, 58 and controlling the amount of refrigerant stored in the expansion tank 60.

  Next, the configuration of the controller 70 will be described with reference to FIG. In FIG. 2, a comparator 700 obtains a difference ΔPad between the discharge pressure set value Pas of the compressor 44 and the discharge pressure detection value Pad detected by the discharge pressure sensor 65. This difference ΔPad is sent to the discharge pressure set value increase / decrease unit 704 via the timer 702. The discharge pressure set value increase / decrease unit 704 calculates an increase / decrease amount ΔPas with respect to the discharge pressure set value Pas based on the value of the difference ΔPad and the measurement time of the timer 702. The discharge pressure set value calculator 706 inputs the increase / decrease amount ΔPas and the rotation speed detection value of the compressor 44, and sets a new discharge pressure set value Pas. In the discharge pressure regulator 708, the electromagnetic on-off valves 56 and 58 are operated so that the discharge pressure of the compressor 44 becomes a new discharge pressure set value Pas.

  On the other hand, detection values of the temperature sensor 30 and the humidity sensor 32 are input to the absolute humidity calculator 710. The absolute humidity calculator 710 calculates an absolute humidity Had from the temperature of the inlet side regeneration air of the air heater 46 and the relative humidity Hrd. From the wet air diagram shown in FIG. 4, the absolute humidity can be determined from the dry bulb temperature and relative humidity. The relative humidity / temperature calculator 712 calculates the regeneration air DA at the inlet of the desiccant rotor 20 from the absolute humidity Had obtained by the absolute humidity calculator 710 and the relative humidity set value Hrs of the regeneration air DA at the inlet of the desiccant rotor 20. The optimum temperature setting value Tas is obtained.

  The comparator 714 obtains a difference between the temperature set value Tas and the detected value Tad of the temperature sensor 34, and inputs this difference and the detected value of the temperature sensor 26 to the compressor rotational speed calculator 716. The compressor rotational speed calculator 716 calculates the rotational speed manipulated variable Rca of the compressor 44 from these input values, and drives the drive motor 44a so as to obtain the computed rotational speed manipulated variable Rca. On the other hand, the rotation speed detection value Rcd of the compressor 44 detected by the rotation speed sensor 64 is compared with the rotation speed threshold value Rcs by the comparator 718, and these differences are input to the discharge pressure set value calculator 706.

  Next, the operation procedure of the dehumidifying air conditioner 10 will be described based on FIG. First, the operation of the dehumidifying air conditioner 10 is started by the operation command (S10). The comparator 718 compares the rotation speed detection value Rcd of the compressor 44 detected by the rotation speed sensor 64 with the upper limit threshold RH of the rotation speed threshold Rcs (S12). If RH <Rcd does not hold, then Rcd is compared with the lower limit threshold value RL of the rotation speed threshold value Rcs (S14). When RL> Rcd, next, the comparator 700 compares the discharge pressure set value Pas of the compressor 44 with the discharge pressure detection value Pad, and the timer 702 measures the time during which the state of Pas> Pad continues. (S16).

  When this duration exceeds a set time t1 seconds (for example, t1 = 100 to 300 seconds), the discharge pressure set value increase / decrease unit 704 decreases the discharge pressure set value Pas of the compressor 44 by the pressure increase / decrease set value ΔP. A command is issued (S18). Based on this command, the discharge pressure set value calculator 706 sets a new discharge pressure set value Pas obtained by subtracting the pressure increase / decrease set value ΔP from the current discharge pressure set value Pas. Pressure limiting operation is started at this new discharge pressure set value Pas (S20). In the discharge pressure regulator 708, the electromagnetic on-off valves 56 and 58 are operated so that the discharge pressure of the compressor 44 becomes a new discharge pressure set value Pas. Here, the discharge pressure set value Pas is 10.5 MPa, for example, and the pressure increase / decrease set value ΔP is 0.1 to 0.2 MPa, for example.

  In S12, the timer 702 measures that RH <Rcd and pressure-limiting operation is being performed (S22) and that the state of RH <Rcd has continued for t2 (for example, t2 = 100 to 300 seconds) or longer. When (S24), the discharge pressure set value increase / decrease unit 704 issues a command to increase the discharge pressure set value Pas by the pressure increase / decrease set value ΔP (S26). Based on this command, the discharge pressure set value calculator 706 sets a new discharge pressure set value Pas obtained by adding the pressure increase / decrease set value ΔP to the current discharge pressure set value Pas. The operation is started at this new discharge pressure set value Pas. Next, the discharge pressure set value Pas is compared with the initial pressure set value Pd. If Pd <Pas (S28), the discharge pressure set value Pas is returned to the initial pressure set value Pd (Pas = Pd), and the pressure limiting operation is performed. Is finished (S30). If Pd <Pas is not satisfied in S28, the process returns to S12 and the same operation as described above is repeated.

  According to the present embodiment, stable operation can be maintained by sequentially repeating the above operations, and the operation of the solenoid valves 56 and 58 can be maintained normally. Therefore, it is not necessary to unnecessarily increase the amount of refrigerant flowing through the refrigerant circulation path 42, and the amount of refrigerant can be reduced, and the discharge pressure can be reduced during the low rotation operation of the compressor 44. Therefore, the COP of the heat pump device 40 can be reduced. It can be improved. Further, it is possible to prevent the electromagnetic opening / closing valves 56 and 58 from being worn and their life from being shortened.

  Moreover, since the relative humidity and temperature of the air heater inlet side regeneration air are detected and the relative humidity of the desiccant rotor inlet side regeneration air is calculated from these detected values, the relative humidity can be accurately obtained, It becomes easy to detect the relative humidity of the regeneration air. Further, the compressor 44 has a magnitude relationship between the rotation speed detection value Rca of the compressor 44 and the upper limit threshold value RH or the lower limit threshold value RL, and a magnitude relationship between the discharge pressure detection value Pad of the compressor 44 and the discharge pressure set value Pas. Since the increase / decrease of the discharge pressure set value Pas is set, fine control is possible. Further, since the set times t1 and t2 are provided by the timer 702, stable control that is not affected by instantaneous disturbance can be performed.

  According to the present invention, it is possible to realize a dehumidifying air conditioner capable of stable operation even when the cooling load and the heating load are unbalanced.

DESCRIPTION OF SYMBOLS 10 Dehumidification air conditioner 12 Air conditioning room 14 Reproduction | regeneration room 16 Partition 18 Air-conditioned room 20 Desiccant rotor 20a Rotating shaft 22 Precooler 24 Supply fan 26 Temperature sensor (1st temperature sensor)
30 Temperature sensor 32 Humidity sensor 34 Temperature sensor (second temperature sensor)
36 Regenerative Fan 40 Heat Pump Device 42 Refrigerant Circulation Path 44 Compressor 46 Air Heater 48 Expansion Valve 50 Air Cooler 52, 54 Branch Path 56, 58 Electromagnetic On / Off Valve 60 Expansion Tank 62 Inverter Device 64 Rotation Speed Sensor 65 Discharge Pressure Sensor 70 Controller 700, 714 , 718 Comparator 702 Timer 704 Discharge pressure set value increase / decrease unit 706 Discharge pressure set value calculator 708 Discharge pressure adjuster 710 Absolute humidity calculator 712 Relative humidity / temperature calculator 716 Compressor rotation speed calculator DA Regenerative air OA Outside air RA Indoor air SA Processed air Had Air heater inlet absolute humidity Hrd Air heater inlet relative humidity detection value Hrs Desiccant rotor inlet relative humidity setting value Pas Discharge pressure setting value Pad Discharge pressure detection value Pd Initial pressure setting value ΔP Discharge pressure increase / decrease set value ΔPad Difference Δ Pressure increasing or decreasing the set value Tas desiccant rotor inlet temperature calculation value Tad desiccant rotor inlet temperature detection value Rca rotational speed operating amount Rcd rotation speed detection value

Claims (4)

A dehumidifying step of dehumidifying the air to be treated by adsorbing moisture in the air to be treated with a desiccant rotor;
An air to be treated which is heated by the heat generated at the time of adsorption in the dehumidifying step, is cooled by an air cooler constituting a part of the heat pump device, and then supplied to the air-conditioned room; and
In the dehumidification air conditioning method of performing a regeneration step of regenerating the desiccant rotor with regeneration air heated by an air heater that constitutes a part of the heat pump device,
A first step of adjusting a refrigerant storage amount of an expansion tank communicating with a refrigerant circulation path of the heat pump device, and adjusting a discharge pressure of the compressor ;
At least one of the relative humidity or temperature of the regeneration air at the inlet of the desiccant rotor is detected so that the temperature of the air to be treated at the outlet of the air cooler becomes a set value, and at least one of the relative humidity or temperature becomes a set value. And a second step of controlling the rotational speed of the compressor constituting the heat pump device,
A third step of reducing the discharge pressure set value of the compressor when the rotation speed of the compressor does not reach the lower limit threshold and the state where the discharge pressure of the compressor does not reach the set value exceeds a set time;
When the state in which the rotation speed of the compressor exceeds the upper limit threshold exceeds a set time, the fourth step of increasing the discharge pressure set value of the compressor,
The dehumidifying air conditioning method characterized by sequentially repeating the third step and the fourth step. In the second step,
A first step of detecting the temperature and relative humidity of the regeneration air at the air heater inlet;
A second step of calculating the absolute humidity of the regeneration air from the temperature and relative humidity of the regeneration air detected in the first step;
Performing a third step of determining a set temperature of the regeneration air at the inlet of the desiccant rotor from the absolute humidity calculated in the second step and a relative humidity setting value of the regeneration air at the desiccant rotor inlet;
The dehumidifying air-conditioning method according to claim 1, wherein the rotational speed and discharge pressure of the compressor are controlled so that the temperature of the regenerated air at the inlet of the desiccant rotor becomes the set temperature. A desiccant rotor that adsorbs moisture in the air to be treated and dehumidifies the air to be treated, and a heat pump device having a heat pump cycle component device,
The heat pump cycle component device includes a compressor provided in a refrigerant circuit, an expansion valve, an air cooler that cools air to be treated that has been heated during adsorption, and an air heater that heats regenerated air that regenerates the desiccant rotor. In the device
An expansion tank that is connected to the refrigerant circulation path of the heat pump device via a branch path with an on-off valve, and stores the refrigerant;
A first temperature sensor for detecting the temperature of the air to be treated at the outlet of the air cooler;
At least one of detection means for detecting the relative humidity of the regeneration air at the inlet of the desiccant rotor or a second temperature sensor for detecting the temperature of the regeneration air;
A rotational speed control device for controlling the rotational speed of the compressor;
Measure the duration of the state where the rotation speed of the compressor does not reach the lower limit threshold and the discharge pressure of the compressor does not reach the set value, and the duration of the state where the discharge pressure of the compressor exceeds the upper limit threshold A compressor for measuring, the compressor so that the temperature of the air to be treated at the outlet of the air cooler becomes a set value, and at least one of the relative humidity or temperature of the regenerated air for regenerating the desiccant rotor becomes a set value And a controller for reducing or increasing the discharge pressure set value of the compressor when the duration measured by the timer exceeds a set time. Air conditioner. The controller is
A rotational speed calculator for calculating the rotational speed of the compressor at which the temperature of the air to be treated at the outlet of the air cooler is a set value and at least one of the relative humidity or temperature of the regenerated air for regenerating the desiccant rotor is a set value;
A discharge pressure set value increase / decrease unit that reduces or increases the discharge pressure set value of the compressor when the duration measured by the timer exceeds a set value;
A discharge pressure set value calculator for calculating the discharge pressure set value of the compressor from the rotation speed detection value of the compressor and the output of the discharge pressure set value increase / decrease unit;
4. A discharge pressure regulator that operates the on-off valve based on a discharge pressure set value calculated by the discharge pressure set value calculator to control a discharge pressure of the compressor. Dehumidification air conditioner of description.

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