Desiccant air conditioning system

Abstract

To provide a desiccant air-conditioning system which can secure dehumidification performance even if the temperature of hot water for regenerating an absorbent is changed.SOLUTION: A desiccant air-conditioning system comprises: a pre-coil into which cold water flows and which cools outside air; an adsorbent through which outside air cooled by the pre-coil passes, and which dehumidifies the outside air by adsorbing a water component contained in the outside air; an after-coil into which the cold water flows, and which cools the outside air dehumidified by the adsorbent for supplying it indoors; a regeneration coil into which hot water flows, and which warms the air discharged from indoors and passing through the adsorbent, and desorbs the water component contained in the adsorbent having adsorbed the water component; and a control part for securing dehumidification performance with respect to the outside air by the pre-coil and the adsorbent by controlling the temperature of the cold water flowing into the pre-coil on the basis of the temperature of the hot water flowing into the regeneration coil.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a desiccant air conditioning system.

Background Art

[0002] The desiccant air conditioning system described in Patent Document 1 is formed by providing a partition between an introduction unit having an introduction passage for introducing and dehumidifying outside air and an exhaust unit having an exhaust passage for warming the outside air as regenerated outside air and exhausting it to the outside. A dehumidification rotor that dehumidifies the outside air passing through the introduction passage side and regenerates the desiccant by the outside air passing through the exhaust passage side is arranged across the introduction passage and the exhaust passage. A multi-stage indirect evaporative cooling device having a function of making the high-temperature and dry outside air passing through the dehumidification rotor on the introduction passage side into an appropriate temperature and low humidity is arranged in this introduction passage to make it an appropriate temperature and humidity and supply it to the room. On the other hand, the outside air sucked in the exhaust passage or the return air from the room is passed through a heat coil that circulates warm water or warm air heated by a sensible heat rotor and / or solar heat, and the warmed outside air is exhausted to the outside of the device via the dehumidification rotor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a desiccant air conditioner provided in a desiccant air conditioning system, the adsorbent provided on the desiccant rotor is regenerated by desorbing moisture by the air that has passed through a regeneration coil into which warm water flows. Further, the regenerated adsorbent adsorbs the moisture contained in the outside air that has passed through a pre-coil into which cold water flows, and the outside air with moisture adsorbed passes through an after-coil and is supplied to the room. Thus, the moisture in the outside air cooled by passing through the pre-coil is adsorbed by the adsorbent, and the dehumidified air is supplied to the room.

[0005] Here, hot water flowing into the regeneration coil was generated by collecting solar heat. However, solar heat is an unstable heat source that varies from day to day. For example, if the temperature of the hot water used to regenerate the adsorbent is set at 60°C, it may not be possible to generate 60°C hot water on cloudy days, and it may be necessary to generate 60°C hot water separately using a heat pump chiller or boiler. Therefore, additional energy was sometimes required to generate hot water.

[0006] The objective of this disclosure is to ensure dehumidification performance even when the temperature of the hot water used to regenerate the adsorbent changes. [Means for solving the problem]

[0007] A desiccant air conditioning system according to the first embodiment is characterized by comprising: a pre-coil through which chilled water flows in and cools outside air; an adsorbent through which the outside air cooled by the pre-coil passes and dehumidifies the outside air by adsorbing moisture contained in the outside air; an after-coil through which chilled water flows in and cools the outside air dehumidified by the adsorbent in order to supply it to the room; a regeneration coil through which hot water flows in and heats the air exhausted from the room and passing through the adsorbent, and desorbs the moisture contained in the adsorbent that has adsorbed moisture; and a control unit that controls the temperature of the chilled water flowing into the pre-coil based on the temperature of the hot water flowing into the regeneration coil, thereby ensuring the dehumidification performance of the pre-coil and the adsorbent on the outside air.

[0008] According to the configuration of the first embodiment, the control unit controls the temperature of the chilled water flowing into the precoil based on the temperature of the hot water flowing into the regeneration coil to ensure the dehumidification performance of the precoil and adsorbent against the outside air. In this way, instead of forcibly keeping the hot water constant, if the temperature of the hot water changes, the temperature of the chilled water flowing into the precoil is controlled to ensure the dehumidification performance of the precoil and adsorbent against the outside air.

[0009] This ensures that dehumidification performance is maintained even if the temperature of the hot water used to regenerate the adsorbent changes.

[0010] The desiccant air conditioning system according to the second embodiment is characterized in that, in the desiccant air conditioning system according to the first embodiment, the hot water flowing into the regeneration coil is generated by solar heat.

[0011] According to the configuration of the second embodiment, the hot water flowing into the regeneration coil is generated by solar heat. As the solar heat changes daily, the temperature of the hot water flowing into the regeneration coil also changes. However, when the temperature of the hot water changes, the control unit controls the temperature of the chilled water flowing into the pre-coil to ensure the dehumidification performance of the pre-coil and adsorbent against the outside air. In this way, the solar heat, which changes daily, can be used effectively while ensuring dehumidification performance. [Effects of the Invention]

[0012] According to this disclosure, dehumidification performance can be ensured even when the temperature of the hot water used to regenerate the adsorbent changes. [Brief explanation of the drawing]

[0013] [Figure 1] This is a schematic diagram showing a desiccant air conditioning system according to an embodiment of the present disclosure. [Figure 2] This is a schematic diagram showing a hot water supply unit used in a desiccant air conditioning system according to an embodiment of the present disclosure. [Figure 3] This is a block diagram showing the instruction system of a control unit provided in a desiccant air conditioning system according to an embodiment of the present disclosure. [Figure 4] This is a flowchart showing the control flow of the control unit of a desiccant air conditioning system according to an embodiment of the present disclosure. [Modes for carrying out the invention]

[0014] An example of a desiccant air conditioning system according to the embodiment of this disclosure will be described with reference to Figures 1 to 4.

[0015] As shown in FIG. 1, the desiccant air conditioning system 100 includes a desiccant air conditioner 10, a chilled water supply unit 120 that supplies chilled water, which is a low-temperature medium, to the desiccant air conditioner 10, and a hot water supply unit 140 that supplies hot water, which is a high-temperature medium, to the desiccant air conditioner 10. Further, the desiccant air conditioning system 100 includes a control unit 60 (see FIG. 3) that controls each part.

[0016] (Desiccant air conditioner 10) As shown in FIG. 1, the desiccant air conditioner 10 includes a housing 12. Inside the housing 12, an air supply passage 20 that introduces outside air from the outdoors 90 and supplies the outside air to the interior 92, and an exhaust passage 14 that takes in indoor air (hereinafter referred to as "internal air") from the interior 92 and exhausts it to the outdoors 90 are formed.

[0017] The air supply passage 20 and the exhaust passage 14 are partitioned by a partition wall 12a. The air supply passage 20 is formed between the air supply duct 12b formed in the housing 12 and the supply duct 12c, and the exhaust passage 14 is formed between the ventilation duct 12d formed in the housing 12 and the exhaust duct 12e.

[0018] 〔Air supply passage 20〕 As shown in FIG. 1, in the air supply passage 20, a filter 22, an air supply fan 24, a pre-coil 26, a part of the desiccant rotor 28, and an after-coil 30 are arranged in this order from the upstream side to the downstream side in the introduction direction of the outside air.

[0019] -Filter 22, air supply fan 24- The filter 22 is arranged so as to cover the air supply duct 12b, and is configured to remove foreign matters such as dust from the outside air introduced from the outdoors 90 into the interior of the housing 12.

[0020] [[ID=二十五]] The air supply fan 24 introduces outside air from the air supply duct 12b into the air supply passage 20, and generates a flow of outside air (air) that is supplied from the supply duct 12c to the interior 92 in the air supply passage 20.

[0021] -Pre-coil 26- The pre-coil 26 is a so-called heat exchange coil. One end of an inflow pipe 112 for allowing cold water to flow into the pre-coil 26 and one end of an outflow pipe 114 for allowing cold water to flow out from the pre-coil 26 are respectively connected to the pre-coil 26. And cold water is supplied to the pre-coil 26 from a cold water supply unit 120. Note that the cold water supply unit 120 for supplying cold water to the pre-coil 26 will be described later.

[0022] In this configuration, during cooling operation, an air flow of outside air introduced from the air supply duct 12b by the operating air supply fan 24 and supplied from the supply duct 12c to the room 92 is generated. And the outside air flowing through the air supply path 20 exchanges heat with the cold water flowing into the pre-coil 26, reaches a predetermined temperature, and passes through the pre-coil 26.

[0023] -Desiccant rotor 28- The desiccant rotor 28 is arranged across the exhaust path 14 and the air supply path 20 and includes an adsorbent 28a. And as the desiccant rotor 28 rotates, the adsorbent 28a moves between the exhaust path 14 and the air supply path 20 alternately.

[0024] In this configuration, during cooling operation, the part of the adsorbent 28a of the desiccant rotor 28 that has moved to the air supply path 20 adsorbs the moisture contained in the outside air flowing through the air supply path 20. Thereby, the outside air flowing through the air supply path 20 is dehumidified.

[0025] -After-coil 30- The after-coil 30 is a so-called heat exchange coil. One end of an inflow pipe 116 for allowing cold water to flow into the after-coil 30 and one end of an outflow pipe 118 for allowing cold water to flow out from the after-coil 30 are respectively connected to the after-coil 30. And cold water is supplied to the after-coil 30 from a cold water supply unit 120.

[0026] In this configuration, during cooling, the outside air flowing through the air supply passage 20 undergoes heat exchange with the chilled water supplied to the after-coil 30, reaching a predetermined temperature, and is then supplied to the room 92 through the after-coil 30 and the supply duct 12c.

[0027] [Exhaust passage 14] In the exhaust passage 14, the regeneration coil 42, the rest of the desiccant rotor 28, and the exhaust fan 44 are arranged in the order shown in Figure 1, from the upstream side to the downstream side in the direction of exhaust of the internal air.

[0028] -Recycled Coil 42- The regeneration coil 42 is a so-called heat exchange coil, and is connected to an inlet pipe 162 for bringing hot water into the regeneration coil 42 and an outlet pipe 164 for releasing hot water from the regeneration coil 42. Hot water is supplied to the regeneration coil 42 from a hot water supply unit 140. The hot water supply unit 140 that supplies hot water to the regeneration coil 42 will be described later.

[0029] - Exhaust fan 44 - The exhaust fan 44 is designed to draw in indoor air from the ventilation duct 12d into the exhaust passage 14 and create a flow of indoor air (air) in the exhaust passage 14, which is then exhausted from the exhaust duct 12e to the outside 90.

[0030] In this configuration, during cooling, the indoor air flowing through the exhaust passage 14 undergoes heat exchange with the hot water flowing into the regeneration coil 42, reaching a predetermined temperature before passing through the regeneration coil 42.

[0031] Furthermore, the portion of the adsorbent 28a of the desiccant rotor 28 that has moved to the exhaust passage 14 is regenerated by the internal air that has passed through the regeneration coil 42. Specifically, the adsorbent 28a of the desiccant rotor 28 is regenerated by the desorption of moisture by the internal air that has passed through the regeneration coil 42. The internal air that has passed through the desiccant rotor 28 is then exhausted to the outdoors 90 through the exhaust duct 12e.

[0032] (Cold water supply section 120) As shown in Figure 1, the chilled water supply unit 120 includes an inlet pipe 112, one end of which is connected to the precoil 26 and through which chilled water flows into the precoil 26, and an outlet pipe 114, one end of which is connected to the precoil 26 and through which chilled water flows out of the precoil 26. Furthermore, the chilled water supply unit 120 includes an inlet pipe 116 that branches off from the inlet pipe 112 and is connected to the aftercoil 30, and an outlet pipe 118 that branches off from the outlet pipe 114 and is connected to the aftercoil 30. The chilled water supply unit 120 also includes a heat pump chiller 122 to which the other end of the inlet pipe 112 and the other end of the outlet pipe 114 are respectively connected.

[0033] Furthermore, the inlet pipe 112 is equipped with a temperature sensing unit 112a on the precoil 26 side for detecting the temperature of the chilled water, and the inlet pipe 116 is equipped with a temperature sensing unit 116a for detecting the temperature of the chilled water. In addition, the outlet pipe 114 is equipped with a valve 114a on the precoil 26 side for adjusting the flow rate, and the outlet pipe 118 is equipped with a valve 118a for adjusting the flow rate.

[0034] In this configuration, during cooling, the chilled water generated by the heat pump chiller 122 flows through the inlet pipe 112 and the outlet pipe 114, circulating between the heat pump chiller 122 and the precoil 26. Similarly, the chilled water generated by the heat pump chiller 122 flows through the inlet pipes 112, 116 and the outlet pipes 118, 114, circulating between the heat pump chiller 122 and the aftercoil 30.

[0035] (Hot water supply section 140) As shown in Figure 2, the hot water supply unit 140 includes a solar thermal collector 142, a hot water storage tank 144 for storing hot water, and a heat exchanger 146 for exchanging heat between the hot water flowing through the solar thermal collector 142 and the hot water flowing through the hot water storage tank 144.

[0036] Furthermore, the hot water supply unit 140 includes a circulation pipe 150 through which hot water flows between the solar thermal collector 142 and the heat exchanger 146, and a circulation pipe 152 through which hot water flows between the hot water storage tank 144 and the heat exchanger 146. The hot water supply unit 140 also includes a temperature sensing unit 144a for detecting the temperature of the hot water in the hot water storage tank 144.

[0037] Furthermore, the circulation pipe 150 is equipped with a pump 150a that generates a flow of hot water, and the circulation pipe 152 is equipped with a pump 152a that generates a flow of hot water.

[0038] Furthermore, the hot water supply unit 140 includes an inlet pipe 162, one end of which is connected to the regeneration coil 42, through which hot water flows from the hot water storage tank 144 to the regeneration coil 42, and an outlet pipe 164, one end of which is connected to the regeneration coil 42, through which hot water flows from the regeneration coil 42 to the hot water storage tank 144.

[0039] Furthermore, the inlet pipe 162 is equipped with a pump 162a that generates the flow of hot water, a valve 162b that controls the amount of hot water flowing, and a temperature sensing unit 162c that detects the temperature of the hot water, in this order from the upstream side to the downstream side in the direction of the hot water flow.

[0040] Furthermore, the outlet pipe 164 is equipped with valves 164a and 164b, which control the amount of hot water flowing through it, in this order from the upstream side to the downstream side in the direction of hot water flow.

[0041] Furthermore, the hot water supply unit 140 includes a branch pipe 166 that branches off from the inlet pipe 162 in the direction of hot water flow downstream of valve 162b, and a branch pipe 168 that branches off from the outlet pipe 164 in the direction of hot water flow between valve 164a and valve 164b.

[0042] Furthermore, the branch pipe 166 is equipped with a valve 166a for controlling the amount of hot water flowing through it, and the branch pipe 168 is equipped with a valve 168a for controlling the amount of hot water flowing through it.

[0043] (others) As shown in Figure 1, the desiccant air conditioning system 100 includes an outside air detection unit 180 that detects the temperature and humidity of the outside air supplied to the room 92 by the desiccant air conditioning device 10, and an inside air detection unit 182 that detects the temperature and humidity of the inside air supplied to the room 92 by the desiccant air conditioning device 10.

[0044] (Control unit 60) As shown in Figure 3, the control unit 60 controls various parts such as the heat pump chiller 122 based on information from the outside air detection unit 180, the inside air detection unit 182, and the temperature measurement units 162c, 112a, 116a, and 144a.

[0045] Furthermore, the control unit 60 acquires a pre-calculated desiccant performance curve. The desiccant performance curve is a dehumidification curve derived from the temperature of the hot water flowing into the regeneration coil 42, the desiccant performance of the desiccant rotor 28, and the temperature of the chilled water flowing into the precoil 26.

[0046] For example, at the rated capacity, the design may specify a hot water temperature of 60°C and a chilled water temperature of 13°C. In this case, for example, if the hot water temperature is 50°C or 40°C, the chilled water temperature required to achieve the same dehumidification capacity as the rated capacity can be determined from the desiccant performance curve. In other words, the dehumidification performance can be derived from the temperature and humidity of the outside air, the temperature and humidity of the inside air, the temperature of the hot water, and the temperature of the chilled water.

[0047] The control of each part by the control unit 60 will be explained later along with its operation.

[0048] (action) Next, the operation of the desiccant air conditioning system 100 will be explained using the flow diagram shown in Figure 4. In the hot water supply unit 140, pumps 150a, 152a, 162a, and heat exchanger 146 are in operation, and the hot water circulates through the respective pipes.

[0049] When the desiccant air conditioning unit 10 is activated, the supply fan 24 and exhaust fan 44 operate, and the desiccant rotor 28 rotates. Then, in step S100, the control unit 60 obtains the target temperature and target humidity of the indoor air from an input unit (not shown).

[0050] Next, in step S200, the control unit 60 obtains the temperature and humidity of the outside air from the outside air detection unit 180 and the temperature and humidity of the inside air from the inside air detection unit 182.

[0051] Next, in step S300, the control unit 60 derives the required dehumidification amount based on each acquired value.

[0052] Next, in step S400, the control unit 60 obtains the temperature of the hot water flowing from the temperature sensing unit 162c into the regeneration coil 42, and derives the temperature of the chilled water flowing into the precoil 26 from the desiccant performance curve in order to secure the required amount of dehumidification based on this hot water temperature.

[0053] For example, when the hot water temperature is 60°C, the cold water temperature is derived to be 13°C, and when the hot water temperature is 45°C, the cold water temperature is derived to be 7°C.

[0054] Next, in step S500, the control unit 60 controls the heat pump chiller 122 so that chilled water at the temperature derived in step S400 is generated. Then, the control unit 60 obtains the temperature of the chilled water detected by the temperature sensing unit 112a and terminates the series of operations. Furthermore, after the series of operations is completed, the aforementioned process is repeated at predetermined intervals. In other words, if the temperature of the hot water flowing into the regeneration coil 42 changes, the control unit 60 controls each part based on the temperature of the hot water after the change.

[0055] (summary) As explained above, in the desiccant air conditioning system 100, the temperature of the chilled water flowing into the precoil 26 is controlled based on the temperature of the hot water flowing into the regeneration coil 42 to ensure dehumidification performance. Therefore, even if the temperature of the hot water used to regenerate the adsorbent 28a changes, dehumidification performance can be ensured.

[0056] Furthermore, in the desiccant air conditioning system 100, the hot water flowing into the regeneration coil 42 is generated by solar heat. Since solar heat is an unstable heat source that varies from day to day, the temperature of the hot water will differ, for example, between a sunny day and a cloudy day. However, as mentioned above, the temperature of the chilled water flowing into the pre-coil 26 is controlled based on the temperature of the hot water flowing into the regeneration coil 42 to ensure dehumidification performance. Therefore, the solar heat, which changes daily, can be used effectively.

[0057] Although this disclosure has described in detail a particular embodiment, it will be apparent to those skilled in the art that this disclosure is not limited to such embodiments, and that various other embodiments are possible within the scope of this disclosure. In the above embodiment, the control unit 60 controlled each part based on the target temperature and target humidity of the internal air, but for example, the supply air temperature, supply air dew point temperature, and return air dew point temperature may also be the targets of control.

[0058] Furthermore, although not specifically described in the above embodiment, if the temperature of the hot water falls below the allowable temperature, the hot water heated by a heat source device such as a hot water chiller (not shown) interposed between the branch pipes 166 and 168 may be flowed into the regeneration coil 42.

[0059] Furthermore, in the above embodiment, chilled water was generated by the heat pump chiller 122. However, on sunny days or when high-temperature hot water can be obtained in sufficient quantity, the temperature of the hot water supplied to the regeneration coil and the temperature of the chilled water supplied to the precoil can be increased, and dehumidification performance can be ensured, as explained using the desiccant performance curve described above. In such cases, medium-temperature chilled water generated using geothermal energy as a heat source may be supplied to the precoil.

[0060] Furthermore, although not specifically described in the above embodiment, the control unit 60 may control the flow rate of hot water by controlling valve 162b, or control the flow rate of cold water by controlling valve 114a. [Explanation of Symbols]

[0061] 10 Desiccant air conditioning system 26 Precoil 28a Adsorbent 30 After Coil 42 Recycled Coils 60 Control Unit

Claims

1. A precoil cools the outside air by allowing cold water to flow in, The outside air cooled by the aforementioned precoil passes through an adsorbent that adsorbs moisture contained in the outside air and dehumidifies the outside air, An after-cooling coil into which cold water flows and cools the outside air, which has been dehumidified by the adsorbent, to supply into the room, A regeneration coil into which hot water flows, heats the air exhausted from the room and passing through the adsorbent, and desorbs the moisture contained in the adsorbent that has adsorbed moisture. A control unit controls the temperature of the cold water flowing into the pre-coil based on the temperature of the hot water flowing into the regeneration coil, thereby ensuring the dehumidification performance of the pre-coil and the adsorbent against the outside air. A desiccant air conditioning system equipped with [a specific feature].

2. The hot water flowing into the regeneration coil is generated by solar heat. The desiccant air conditioning system according to claim 1.

Images