JPH1026369A - Air conditioning system and control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exhibit an excellent starting characteristic by enabling a rapid recovery of an absorbing ability of a desiccant. SOLUTION: This air conditioning system comprises a desiccant 103 which absorbs moisture in processed air in a processed air passage A and regenerated by regenerating air in a regenerating air passage B and a refrigerating cycle which includes a compressor 260, two selectively switchable evaporators 240A, 240B and a condenser 220. Either one of two evaporators 240A, 240B falls in a heat exchanging relationship with the regenerated air after passing through the desiccant 103, while other evaporator falls in a heat exchanging relationship with the processed air after passing through the desiccant 103. Furthermore, the condenser 220 is connected such that it falls in a heat exchanging relationship with the regenerating air before passing through the desiccant 103. Heat is collected from the regenerated air after passing through the desiccant 103 by working the evaporators 240A, 240B which carry out a heat exchanging with the regenerated air after passing through the desiccant 103 and heat the regenerated air before passing through the desiccant or collect heat from the processed air before passing through the desiccant 103 and heat the regenerated air before passing through the desiccant 103.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system, and more particularly to an air conditioning system capable of continuously performing a desiccant moisture adsorption process and a heat pump desiccant regeneration process.

[0002]

FIG. 3 shows a prior art disclosed in US Pat. No. 4,430,864, in which a processing air path A and
Regeneration air path B and two desiccant beds 103A,
103B, and a heat pump 200 for regenerating the desiccant and cooling the processing air. This heat pump 200 has two desiccant beds 103A and 103A.
The heat exchangers 210 and 220 buried in B are used as high and low heat sources. One desiccant bed performs an adsorption step by passing process air, and the other desiccant performs a regeneration step by passing regeneration air. After this air treatment has been performed for a predetermined time, the four-way switching valves 105 and 106 are switched to flow the regeneration and processing air through the opposite desiccant bed to perform the reverse process.

[0003]

In the prior art as described above, since the high and low heat sources of the heat pump 200 and the respective desiccants are integrated with each other, the amount of heat corresponding to the cooling effect ΔQ is equal to the heat pump (refrigerator). Is loaded as is. That is, the effect beyond the capacity of the heat pump (refrigerator) cannot be obtained. Therefore, it is not possible to obtain the effect of simply increasing the complexity of the device.

Therefore, in order to solve such a problem, as shown in FIG. 4, a high-temperature heat source 220 of a heat pump is disposed in a regeneration air path B to heat regeneration air, and a heat pump It is conceivable to provide a low-temperature heat source 210 to cool the processing air, and to provide a heat exchanger 104 for performing sensible heat exchange between the processing air after passing through the desiccant 103 and the regeneration air before passing through the desiccant 103.
Here, the desiccant 103 uses a desiccant rotor that rotates over both the processing air path A and the regeneration air path B.

Thus, as shown in the psychrometric chart of FIG. 5, in addition to the cooling effect of the heat pump, a cooling effect (ΔQ) combining the cooling effect of the sensible heat exchange between the processing air and the regeneration air is obtained. Therefore, it is possible to obtain higher efficiency than the air conditioning system of FIG. 3 with a compact configuration.

However, even in the air-conditioning system having such a configuration, when the desiccant naturally absorbs moisture and the moisture absorbing ability is reduced in a case such as when the system is started after a long-term stoppage of the system, FIG. As indicated by the dotted line in Fig. 5, at the beginning of the operation, sufficient moisture could not be absorbed from the treated air, and the temperature at the desiccant outlet did not rise much (state (L)).
For this reason, the temperature difference between the processing air and the regeneration air in the sensible heat exchanger 104 is small, the amount of exchange heat is small, the regeneration air cannot be heated sufficiently, and the inlet temperature of the high-temperature heat source 220 of the heat pump for the regeneration air also decreases. State (R)). Even if the heat pump is operated from such a state, the regeneration air cannot be sufficiently heated (state (T)), and therefore, there is a problem that the desiccant does not recover its moisture absorbing ability, so that the start-up of the system is delayed.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an air conditioning system which is capable of quickly recovering the desiccant's moisture absorbing ability and has excellent starting characteristics.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned object.
A vapor compression refrigeration cycle having a desiccant that adsorbs moisture in the processing air in the processing air path and is regenerated by the regeneration air in the regeneration air path, and a compressor, two selectively switchable evaporators and a condenser. One of the two evaporators has a heat exchange relationship with the regenerated air after desiccant passage, the other has a heat exchange relationship with the treated air after desiccant passage, and the condenser has a heat exchange relationship before desiccant passage. Connected in a heat exchange relationship with the regeneration air
An evaporator, which has a heat exchange relationship with the regenerated air after passing the desiccant, acts to recover heat from the regenerated air after passing the desiccant and heat the regenerated air before passing the desiccant, or exchanges heat with the processed air after passing the desiccant An air conditioning system characterized in that it is possible to select whether to recover heat from the processing air before passing through the desiccant and heat the regenerated air before passing through the desiccant by operating the related evaporator.

As described above, the normal operation mode in which sensible heat is recovered from the treated air after passing through the desiccant to heat the regeneration air before passing through the desiccant, that is, the first operation mode, and the sensible heat is recovered from the regeneration air after passing through the desiccant. By recovering the heat and heating the regeneration air before desiccant passage, it is possible to cope with the two operation modes of the second operation mode for preparing before starting to increase the desiccant regeneration capability before starting.

According to a second aspect of the present invention, an auxiliary heating means is provided on the upstream side of the desiccant of the regeneration air and on the downstream side of the condenser to recover heat from the regeneration air after passing through the desiccant and regenerate the regeneration air before passing through the desiccant. The air-conditioning system according to claim 1, wherein when the air is heated, the regeneration air is heated by the auxiliary heating means. Thus, by providing the auxiliary heating means at an appropriate position, the auxiliary heating means can quickly increase the desiccant adsorption capacity before starting while sufficiently utilizing the heating capacity of the heat pump excellent in energy efficiency. .

The invention according to claim 3 is the air conditioning system according to claim 2, wherein the auxiliary heating means is an electric heater. The invention according to claim 4 is the air conditioning system according to claim 2, wherein the auxiliary heating means is a heat exchanger using steam as a heat source. The invention according to claim 5 is the air conditioning system according to claim 2, wherein the auxiliary heating means is a heat exchanger using hot water as a heat source.

According to a sixth aspect of the present invention, there is provided a desiccant which adsorbs moisture in the processing air in the processing air path and is regenerated by the regenerating air in the regenerating air path, and a compressor which is selectively switched between two evaporators. And a vapor compression refrigeration cycle having a condenser and a condenser. One of the two evaporators has a heat exchange relationship with the regenerated air after desiccant passage, and the other has a heat exchange relationship with the treated air after desiccant passage. In an operation method of an air conditioning system having an exchange relationship and connected so that the condenser has a heat exchange relationship with the regeneration air before desiccant passage, the evaporator having a heat exchange relationship with regeneration air after desiccant passage is operated. When the heat is recovered from the regenerated air after passing through the desiccant and the regenerated air before passing through the desiccant is heated, the blower for the regenerated air is operated and the In the case where the evaporator is turned off and heat is exchanged with the treated air after passing through the desiccant to act to recover heat from the treated air before passing through the desiccant and heat the regenerated air before passing through the desiccant, the blower and treatment of the regenerated air A method for controlling an air conditioning system, wherein both air blowers are operated.

Thus, in a normal cooling operation,
The first operation mode in which the drive system of both the regeneration air and the processing air is operated to recover the sensible heat from the processing air after the desiccant and heat the regeneration air before the desiccant, is selected. Only the drive system of the regeneration air is operated to actuate an evaporator that has a heat exchange relationship with the regeneration air after the desiccant has passed, to recover heat from the regeneration air after the desiccant has passed, and to heat the regeneration air before the desiccant has passed. By selecting the operation mode, the desiccant adsorption capacity at the time of starting can be enhanced, and an air conditioning system having excellent starting characteristics can be provided, and after the start, the processing air after desiccant passing in the first operation mode can be provided. By operating the evaporator having a heat exchange relationship to recover heat from the treated air before desiccant passage and heating the regenerated air before desiccant passage,
Since the cooling of the processing air and the heating of the regeneration air can be realized at the same time, an air conditioning system with high energy efficiency can be provided.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a desiccant air conditioner according to the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a basic configuration of an air conditioning system according to the present invention.
0, a vapor compression refrigeration cycle is formed using the two evaporators 240A and 240B selectively switchable by the switching valve 270 and the condenser 220 as components, and one of the two evaporators 240A passes through the desiccant 103 The other side 240B has a heat exchange relationship with the treated air after passing through the desiccant 103,
In addition, a cycle is formed in which the condenser 220 has a heat exchange relationship with the regeneration air before passing through the desiccant 103. By this refrigeration cycle, the evaporator 240A, which has a heat exchange relationship with the regenerated air after passing through the desiccant 103, is actuated to recover heat from the regenerated air after passing through the desiccant 103 so that the desiccant 1
03 evaporator 2 which heats the regenerated air before passing through, or heat exchanges with the processing air after passing through desiccant 103
By operating the switching valve 370, it is possible to select whether to recover heat from the processing air before passing through the desiccant 103 and heat the regenerated air before passing through the desiccant 103 by operating the switching valve 370.

The desiccant rotor 103 is configured so that the desiccant rotates in a predetermined cycle across both the processing air path A and the regenerating air path B, as described with reference to FIG. The processing air path A is connected to the air-conditioned space and the suction port of the blower 102 for introducing return air through a path 107, the discharge port of the blower 102 is connected to the desiccant rotor 103 via a path 108, The outlet of the processing air is connected to the sensible heat exchanger 104, which has a heat exchange relationship with the regeneration air, via a path 109. The outlet of the processing air of the sensible heat exchanger 104 is connected to the evaporator (cooler) 240B and the path 110. The outlet of the processing air of the cooler 240B is connected to the humidifier 105 and the path 11
1 and a processing air outlet of the humidifier 105 is connected to a processing air outlet serving as an air supply port via a path 112 to form a processing air cycle.

On the other hand, the regeneration air path B is connected via a path 124 to a suction port of a blower 140 for introducing outside air which becomes regeneration air, and a discharge port of the blower 140 has a sensible heat heat exchange relation with the processing air. The outlet of the regeneration air of the sensible heat exchanger 104 is connected to the condenser (heater) 220 via the path 126, and the outlet of the regeneration air of the condenser (heater) 220 is connected to the auxiliary heating. And the outlet of the regeneration air of the auxiliary heating means 310 is connected to the regeneration air inlet of the desiccant rotor 103 via the path 128, and the exit of the regeneration air of the desiccant rotor 103 is connected to the evaporator (cooling). Unit) 240A via a path 129, and the outlet of the evaporator (cooler) 240A is connected to the external space, which is the outlet of the regeneration air, via a path 130 to take in regeneration air from outside. Te form a cycle that exhausted to the outside. In the figure, alphabets K to V circled are
It is a symbol showing the state of air corresponding to FIG.

In the present embodiment, the auxiliary heating means 310 employs an electric heater which is inexpensive and easy to control, since it is used only when the regeneration capability is recovered in a short time. A controller 350 for controlling the electrical contacts 330 of the power supply 320 of the means 310 is provided. The controller 350 is also provided with the switching valve 2 described above.
70 is also controlled.

Next, the cycle of the vapor compression refrigeration cycle of the desiccant air conditioner constructed as described above will be described. When the operation of the switching valve 270 causes the evaporator 240A, which has a heat exchange relationship with the regenerated air after passing through the desiccant 103, to act as the refrigerant, the evaporator (cooler) 240A separates the regenerated air from the regenerated air exiting the desiccant 103 from the latent heat of evaporation. And evaporates, is sucked and compressed by the compressor 260 through the paths 205A and 206, and then is condensed (heated) through the path 201.
After flowing into 220, the heat of condensation is released to the regenerated air before flowing into desiccant 103 and condensed. The condensed refrigerant passes through path 202
, Through the path 203A selected by the switching valve 270, to the expansion valve 250A, where it is decompressed and expanded, and then returned to the evaporator (cooler) 240A.

On the other hand, when the evaporator 240B, which has a heat exchange relationship with the processing air after passing through the desiccant 103, is operated, the refrigerant is passed through the evaporator (cooler) 240B.
Evaporating latent heat of vaporization from the processing air exiting from step 3
After being sucked and compressed by the compressor 260 through the heaters 05B and 206, the refrigerant flows into the condenser (heater) 220 through the path 201 and discharges the heat of condensation into the regenerated air before flowing into the desiccant 103 to be condensed. The condensed refrigerant reaches the switching valve 270 via the path 202, and the path 2 selected by the switching valve 270
After passing through 03B, it reaches expansion valve 250B, where it is decompressed and expanded, and then returned to evaporator (cooler) 240B.

Next, the desiccant 10 of the desiccant air-conditioning system using the heat pump configured as described above as a heat source.
Evaporator 240A having a heat exchange relationship with the regenerated air after three passes
The operation in the case where is applied will be described with reference to the psychrometric chart of FIG. Such an operation mode is performed before starting when the desiccant absorbs moisture spontaneously and the moisture absorbing ability is reduced, for example, when the system is started after a long-term stop of the system. In this operation mode, the blower for the regeneration air is operated and the blower for the processing air is stopped. In addition, the electric contact 330 is closed via the controller 350 to operate the auxiliary heating means 310, and the refrigeration cycle operates the switching valve 270 to operate the evaporator 2 having a heat exchange relationship with the regeneration air.
40A is selected.

External air used as regeneration air (condition
(Q)) is sucked into the blower 140 via the path 124, is pressurized, and is sent to the sensible heat exchanger 104. Sensible heat exchanger 1
In 04, since the processing air is not flowing, heat exchange is not performed and the processing air passes as it is. The regenerated air that has exited the sensible heat exchanger 104 is sent to the condenser (heater) 220 via the path 126, and is heated by the heat pump 200 to increase the temperature (state (S)). Further, the regenerated air exiting the condenser (heater) 220 is heated by the auxiliary heating means 310 via the path 127, and finally rises in temperature to 60 to 80 ° C. (state (T)), and the relative humidity decreases. Auxiliary heating means 31
The regeneration air having a relative humidity lowered after exiting 0 passes through the desiccant rotor 103 to remove moisture from the desiccant rotor and perform a regeneration operation. The regenerated air that has passed through the desiccant rotor 103 flows into the evaporator 240A via the path 129, where the heat is recovered and cooled by the heat pump (state (V)).
Thereafter, it is discarded as exhaust gas through the path 130.

In this way, before starting, the desiccant 10
In the case where the moisture absorption capacity of the fuel cell 3 is reduced, heat is recovered from the regenerated air after passing through the desiccant by selecting the cycle of the heat pump 200 provided, and heat is pumped up to heat the regenerated air before passing through the desiccant 103. Can be. As a result, the heat pump requires a small initial cost, and the heat pump has an operating coefficient COP, as is well known.
Is three to four times as large as an electric heater, which saves energy, lowers operating costs, and reduces the capacity of auxiliary heating means, thereby reducing the initial cost and running cost, and providing an air conditioning system with excellent startup characteristics. Can be provided.

In this embodiment, the auxiliary heating means 310
However, in addition to the above, an electric heater using steam as a heat source or a heat exchanger using hot water as a heat source may be used. In this case, an electromagnetic valve is used instead of the electric contact 330. The controller 350 employs a motor and a motor-operated valve. In addition, compared to the heat pump 200, the auxiliary heating means such as an electric heater can easily obtain a high temperature. Conversely, if the heat pump attempts to obtain a high temperature, the compression ratio of the compressor becomes excessively large. Preferably, it is provided upstream of the air desiccant and downstream of the condenser.

On the other hand, the evaporator 2 having a heat exchange relationship with the processing air after passing through the desiccant 103 of the desiccant air-conditioning system using the heat pump 200 having such a configuration as a heat source.
The operation when 40B is applied is the same as the process shown by the solid line in the psychrometric chart shown in FIG. 5, and operates as follows. Such an operation mode is performed after the operation for desiccant regeneration before the start is completed and the desiccant's moisture absorbing ability is restored.

The return air (process air: state (K)) to be introduced is sucked into the blower 102 via the path 107, is pressurized, is sent to the desiccant rotor 103 via the path 108, and is sent to the desiccant rotor 103 by the moisture absorbent of the desiccant rotor. And the absolute humidity decreases, and the temperature of the air rises due to the heat of adsorption (state (L)). Air with decreased humidity and increased temperature is route 1
After passing through the heat exchanger 09, it is sent to the sensible heat exchanger 104 and exchanges heat with outside air (regenerated air) to be cooled (state (M)). The cooled air passes through the path 110, passes through the evaporator (cooler) 240B, and is cooled (state (N)). The cooled processing air is sent to the humidifier 105 and its temperature is reduced in the isenthalpy process by water injection or vaporization humidification (state (P)), and the path 11
After that, the air is returned to the air-conditioned space as air supply.

The regeneration of the desiccant rotor is performed as follows. The outside air (state (Q)) used as the regenerating air is sucked into the blower 140 via the path 124, is pressurized and sent to the sensible heat exchanger 104, cools the processing air, and rises in temperature (state (R)). )), Is sent to a condenser (heater) 220 via a path 126, and is heated by a heat pump to increase the temperature (state (S)). Further condenser (heater)
The regeneration air that has exited 220 is sent to the auxiliary heating means 210 via the path 127, but since the auxiliary heating means 210 is not acting, the states (S) and (T) are the same, and
The temperature rises to 80 ° C. (state (T)), and the relative humidity decreases. The regenerated air whose relative humidity has decreased is desiccant rotor 1
Passing through 03, moisture of the desiccant rotor is removed and a regenerating action is performed. The regenerated air that has passed through the desiccant rotor 103 flows into the evaporator 240A via the path 129, but the evaporator 240A is not operating and is not cooled (state).
(U) = state (V)) It is discarded as exhaust gas through the path 130.

When the evaporator 240B, which has a heat exchange relationship with the processing air after passing through the desiccant 103, is operated in this way, the desiccant regeneration and the dehumidification and cooling of the processing air are repeatedly performed, so that the air conditioning by the desiccant is performed. It can be carried out. In addition, although the method of using the exhaust accompanying the indoor ventilation as the regeneration air has been widely used in the desiccant air conditioning, the exhaust from the room may be used as the regeneration air in the present invention. Similar effects can be obtained.

[0028]

As described above, according to the present invention, the drive system for the heat pump and the regeneration air is started in the air conditioning system in which the desiccant adsorption process of the desiccant and the desiccant regeneration process by the heat pump can be continuously performed. By operating before and recovering the sensible heat from the treated air after passing through the desiccant and heating the regenerated air before passing through the desiccant, the desiccant adsorption capacity at startup is improved, and the starting characteristics are improved and energy saving is achieved. In addition, since the capacity of the auxiliary heating means can be reduced, an air conditioning system with low initial cost can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a basic configuration of an embodiment of an air conditioning system according to the present invention.

FIG. 2 is an explanatory diagram showing a desiccant air-conditioning cycle of air of the air-conditioning system of FIG. 1 in a psychrometric chart.

FIG. 3 is an explanatory diagram showing a basic configuration of a conventional air conditioning system.

FIG. 4 is an explanatory diagram showing a configuration of a virtual air conditioning system.

FIG. 5 is an explanatory diagram showing a basic configuration of an air conditioning system according to the example of FIG.

[Explanation of symbols]

 102, 140 Blower 103 Desiccant rotor 104 Sensible heat exchanger 200 Heat pump 220 Evaporator 240A, 240B Condenser 260 Compressor 270 Switching valve 310 Auxiliary heating means 350 Controller A Processing air path B Regeneration air path

[Procedure amendment]

[Submission date] September 9, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

Patent application title: Air conditioning system and control method

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system, and more particularly to an air conditioning system capable of continuously performing a desiccant moisture adsorption process and a heat pump desiccant regeneration process.

[0002]

FIG. 3 shows a prior art disclosed in US Pat. No. 4,430,864, in which a processing air path A and
Regeneration air path B and two desiccant beds 103A,
103B, and a heat pump 200 for regenerating the desiccant and cooling the processing air. This heat pump 200 has two desiccant beds 103A and 103A.
The heat exchangers 210 and 220 buried in B are used as high and low heat sources. One desiccant bed performs an adsorption step by passing process air, and the other desiccant performs a regeneration step by passing regeneration air. After this air treatment has been performed for a predetermined time, the four-way switching valves 105 and 106 are switched to flow the regeneration and processing air through the opposite desiccant bed to perform the reverse process.

[0003]

In the prior art as described above, since the high and low heat sources of the heat pump 200 and the respective desiccants are integrated with each other, the amount of heat corresponding to the cooling effect ΔQ is equal to the heat pump (refrigerator). Is loaded as is. That is, the effect beyond the capacity of the heat pump (refrigerator) cannot be obtained. Therefore, it is not possible to obtain the effect of simply increasing the complexity of the device.

Therefore, in order to solve such a problem, as shown in FIG. 4, a high-temperature heat source 220 of a heat pump is disposed in a regeneration air path B to heat regeneration air, and a heat pump It is conceivable to provide a low-temperature heat source 210 to cool the processing air, and to provide a heat exchanger 104 for performing sensible heat exchange between the processing air after passing through the desiccant 103 and the regeneration air before passing through the desiccant 103.
Here, the desiccant 103 uses a desiccant rotor that rotates over both the processing air path A and the regeneration air path B.

Thus, as shown in the psychrometric chart of FIG. 5, in addition to the cooling effect of the heat pump, a cooling effect (ΔQ) combining the cooling effect of the sensible heat exchange between the processing air and the regeneration air is obtained. Therefore, it is possible to obtain higher efficiency than the air conditioning system of FIG. 3 with a compact configuration.

However, even in the air-conditioning system having such a configuration, when the desiccant naturally absorbs moisture and the moisture absorbing ability is reduced in a case such as when the system is started after a long-term stoppage of the system, FIG. As indicated by the dotted line in Fig. 5, at the beginning of the operation, sufficient moisture could not be absorbed from the processing air, and the temperature at the desiccant outlet did not rise much (state (L)). For this reason, the temperature difference between the processing air and the regeneration air in the sensible heat exchanger 104 is small, the amount of exchange heat is small, the regeneration air cannot be heated sufficiently, and the inlet temperature of the high-temperature heat source 220 of the heat pump for the regeneration air also decreases. State (R)). Even if the heat pump is operated in such a state, the regeneration air cannot be sufficiently heated (state (T)), and therefore, there is a problem that the system startup is delayed because the desiccant's ability to absorb moisture is not recovered.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an air conditioning system which is capable of quickly recovering the desiccant's moisture absorbing ability and has excellent starting characteristics.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned object.
A vapor compression refrigeration cycle having a desiccant that adsorbs moisture in the processing air in the processing air path and is regenerated by the regeneration air in the regeneration air path, and a compressor, two selectively switchable evaporators and a condenser. One of the two evaporators has a heat exchange relationship with the regenerated air after desiccant passage, the other has a heat exchange relationship with the treated air after desiccant passage, and the condenser has a heat exchange relationship before desiccant passage. Connected in a heat exchange relationship with the regeneration air
An evaporator, which has a heat exchange relationship with the regenerated air after passing the desiccant, acts to recover heat from the regenerated air after passing the desiccant and heat the regenerated air before passing the desiccant, or exchanges heat with the processed air after passing the desiccant An air conditioning system characterized in that it is possible to select whether to recover heat from the processing air before passing through the desiccant and heat the regenerated air before passing through the desiccant by operating the related evaporator.

As described above, the normal operation mode in which sensible heat is recovered from the treated air after passing through the desiccant to heat the regeneration air before passing through the desiccant, that is, the first operation mode, and the sensible heat is recovered from the regeneration air after passing through the desiccant. By recovering the heat and heating the regeneration air before desiccant passage, it is possible to cope with the two operation modes of the second operation mode for preparing before starting to increase the desiccant regeneration capability before starting.

According to a second aspect of the present invention, an auxiliary heating means is provided on the upstream side of the desiccant of the regeneration air and on the downstream side of the condenser to recover heat from the regeneration air after passing through the desiccant and regenerate the regeneration air before passing through the desiccant. The air-conditioning system according to claim 1, wherein when the air is heated, the regeneration air is heated by the auxiliary heating means. Thus, by providing the auxiliary heating means at an appropriate position, the auxiliary heating means can quickly increase the desiccant adsorption capacity before starting while sufficiently utilizing the heating capacity of the heat pump excellent in energy efficiency. .

The invention according to claim 3 is the air conditioning system according to claim 2, wherein the auxiliary heating means is an electric heater. The invention according to claim 4 is the air conditioning system according to claim 2, wherein the auxiliary heating means is a heat exchanger using steam as a heat source. The invention according to claim 5 is the air conditioning system according to claim 2, wherein the auxiliary heating means is a heat exchanger using hot water as a heat source.

According to a sixth aspect of the present invention, there is provided a desiccant which adsorbs moisture in the processing air in the processing air path and is regenerated by the regenerating air in the regenerating air path, and a compressor which is selectively switched between two evaporators. And a vapor compression refrigeration cycle having a condenser and a condenser. One of the two evaporators has a heat exchange relationship with the regenerated air after desiccant passage, and the other has a heat exchange relationship with the treated air after desiccant passage. In an operation method of an air conditioning system having an exchange relationship and connected so that the condenser has a heat exchange relationship with the regeneration air before desiccant passage, the evaporator having a heat exchange relationship with regeneration air after desiccant passage is operated. When the heat is recovered from the regenerated air after passing through the desiccant and the regenerated air before passing through the desiccant is heated, the blower for the regenerated air is operated and the blower for the treated air is turned on. In the case where the evaporator is turned off and heat is exchanged with the treated air after passing through the desiccant to act to recover heat from the treated air before passing through the desiccant and heat the regenerated air before passing through the desiccant, the blower and treatment of the regenerated air A method for controlling an air conditioning system, wherein both air blowers are operated.

Thus, in a normal cooling operation,
The first operation mode in which the drive system of both the regeneration air and the processing air is operated to recover the sensible heat from the processing air after the desiccant and heat the regeneration air before the desiccant, is selected. Only the drive system of the regeneration air is operated to actuate an evaporator that has a heat exchange relationship with the regeneration air after the desiccant has passed, to recover heat from the regeneration air after the desiccant has passed, and to heat the regeneration air before the desiccant has passed. By selecting the operation mode, the desiccant adsorption capacity at the time of starting can be enhanced, and an air conditioning system having excellent starting characteristics can be provided, and after the start, the processing air after desiccant passing in the first operation mode can be provided. By operating the evaporator having a heat exchange relationship to recover heat from the treated air before desiccant passage and heating the regenerated air before desiccant passage,
Since the cooling of the processing air and the heating of the regeneration air can be realized at the same time, an air conditioning system with high energy efficiency can be provided.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a desiccant air conditioner according to the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a basic configuration of an air conditioning system according to the present invention.
0, a vapor compression refrigeration cycle is formed using the two evaporators 240A and 240B selectively switchable by the switching valve 270 and the condenser 220 as components, and one of the two evaporators 240A passes through the desiccant 103 The other side 240B has a heat exchange relationship with the treated air after passing through the desiccant 103,
In addition, a cycle is formed in which the condenser 220 has a heat exchange relationship with the regeneration air before passing through the desiccant 103. By this refrigeration cycle, the evaporator 240A, which has a heat exchange relationship with the regenerated air after passing through the desiccant 103, is actuated to recover heat from the regenerated air after passing through the desiccant 103 so that the desiccant 1
03 evaporator 2 which heats the regenerated air before passing through, or heat exchanges with the processing air after passing through desiccant 103
By operating the switching valve 370, it is possible to select whether to recover heat from the processing air before passing through the desiccant 103 and heat the regenerated air before passing through the desiccant 103 by operating the switching valve 370.

The desiccant rotor 103 is configured so that the desiccant rotates in a predetermined cycle across both the processing air path A and the regenerating air path B, as described with reference to FIG. The processing air path A is connected to the air-conditioned space and the suction port of the blower 102 for introducing return air through a path 107, the discharge port of the blower 102 is connected to the desiccant rotor 103 via a path 108, The outlet of the processing air is connected to the sensible heat exchanger 104, which has a heat exchange relationship with the regeneration air, via a path 109. The outlet of the processing air of the sensible heat exchanger 104 is connected to the evaporator (cooler) 240B and the path 110. The outlet of the processing air of the cooler 240B is connected to the humidifier 105 and the path 11
1 and a processing air outlet of the humidifier 105 is connected to a processing air outlet serving as an air supply port via a path 112 to form a processing air cycle.

On the other hand, the regeneration air path B is connected via a path 124 to a suction port of a blower 140 for introducing outside air which becomes regeneration air, and a discharge port of the blower 140 has a sensible heat heat exchange relation with the processing air. The outlet of the regeneration air of the sensible heat exchanger 104 is connected to the condenser (heater) 220 via the path 126, and the outlet of the regeneration air of the condenser (heater) 220 is connected to the auxiliary heating. And the outlet of the regeneration air of the auxiliary heating means 310 is connected to the regeneration air inlet of the desiccant rotor 103 via the path 128, and the exit of the regeneration air of the desiccant rotor 103 is connected to the evaporator (cooling). Unit) 240A via a path 129, and the outlet of the evaporator (cooler) 240A is connected to the external space, which is the outlet of the regeneration air, via a path 130 to take in regeneration air from outside. Te form a cycle that exhausted to the outside. In the figure, alphabets K to V circled are
It is a symbol showing the state of air corresponding to FIG.

In the present embodiment, the auxiliary heating means 310 employs an electric heater which is inexpensive and easy to control, since it is used only when the regeneration capability is recovered in a short time. A controller 350 for controlling the electrical contacts 330 of the power supply 320 of the means 310 is provided. The controller 350 is also provided with the switching valve 2 described above.
70 is also controlled.

Next, the cycle of the vapor compression refrigeration cycle of the desiccant air conditioner constructed as described above will be described. When the operation of the switching valve 270 causes the evaporator 240A, which has a heat exchange relationship with the regenerated air after passing through the desiccant 103, to act as the refrigerant, the evaporator (cooler) 240A separates the regenerated air from the regenerated air exiting the desiccant 103 from the latent heat of evaporation. And evaporates, is sucked and compressed by the compressor 260 through the paths 205A and 206, and then is condensed (heated) through the path 201.
After flowing into 220, the heat of condensation is released to the regenerated air before flowing into desiccant 103 and condensed. The condensed refrigerant passes through path 202
, Through the path 203A selected by the switching valve 270, to the expansion valve 250A, where it is decompressed and expanded, and then returned to the evaporator (cooler) 240A.

On the other hand, when the evaporator 240B, which has a heat exchange relationship with the processing air after passing through the desiccant 103, is operated, the refrigerant is passed through the evaporator (cooler) 240B.
Evaporating latent heat of vaporization from the processing air exiting from step 3
After being sucked and compressed by the compressor 260 through the heaters 05B and 206, the refrigerant flows into the condenser (heater) 220 through the path 201 and discharges the heat of condensation into the regenerated air before flowing into the desiccant 103 to be condensed. The condensed refrigerant reaches the switching valve 270 via the path 202, and the path 2 selected by the switching valve 270
After passing through 03B, it reaches expansion valve 250B, where it is decompressed and expanded, and then returned to evaporator (cooler) 240B.

Next, the desiccant 10 of the desiccant air-conditioning system using the heat pump configured as described above as a heat source.
Evaporator 240A having a heat exchange relationship with the regenerated air after three passes
The operation in the case where is applied will be described with reference to the psychrometric chart of FIG. Such an operation mode is performed before starting when the desiccant absorbs moisture spontaneously and the moisture absorbing ability is reduced, for example, when the system is started after a long-term stop of the system. In this operation mode, the blower for the regeneration air is operated and the blower for the processing air is stopped. In addition, the electric contact 330 is closed via the controller 350 to operate the auxiliary heating means 310, and the refrigeration cycle operates the switching valve 270 to operate the evaporator 2 having a heat exchange relationship with the regeneration air.
40A is selected.

Outside air used as regeneration air (state Q )
Is sucked by the blower 140 via the path 124, is pressurized, and sent to the sensible heat exchanger 104. In the sensible heat exchanger 104, no heat exchange is performed because the processing air is not flowing,
Pass as it is. The regenerated air exiting the sensible heat exchanger 104 is sent to the condenser (heater) 220 via the path 126, and is heated by the heat pump 200 to increase the temperature (state S2 ). Further, the regenerated air that has exited the condenser (heater) 220 is heated by the auxiliary heating means 310 via the path 127 and finally rises in temperature to 60 to 80 ° C. (state).
T ), the relative humidity decreases. The regenerated air having a lower relative humidity after exiting the auxiliary heating means 310 is supplied to the desiccant rotor 103.
Pass through to remove water from the desiccant rotor and perform a regeneration action. The regenerated air that has passed through the desiccant rotor 103 flows into the evaporator 240A via the path 129, and is recovered and cooled by the heat pump (state V 2 ).
After passing through 0, it is discarded outside as exhaust gas.

In this way, before starting, the desiccant 10
In the case where the moisture absorption capacity of the fuel cell 3 is reduced, heat is recovered from the regenerated air after passing through the desiccant by selecting the cycle of the heat pump 200 provided, and heat is pumped up to heat the regenerated air before passing through the desiccant 103. Can be. As a result, the heat pump requires a small initial cost, and the heat pump has an operating coefficient COP, as is well known.
Is three to four times as large as an electric heater, which saves energy, lowers operating costs, and reduces the capacity of auxiliary heating means, thereby reducing the initial cost and running cost, and providing an air conditioning system with excellent startup characteristics. Can be provided.

In this embodiment, the auxiliary heating means 310
However, in addition to the above, an electric heater using steam as a heat source or a heat exchanger using hot water as a heat source may be used. In this case, an electromagnetic valve is used instead of the electric contact 330. The controller 350 employs a motor and a motor-operated valve. In addition, compared to the heat pump 200, the auxiliary heating means such as an electric heater can easily obtain a high temperature. Conversely, if the heat pump attempts to obtain a high temperature, the compression ratio of the compressor becomes excessively large. Preferably, it is provided upstream of the air desiccant and downstream of the condenser.

On the other hand, the evaporator 2 having a heat exchange relationship with the processing air after passing through the desiccant 103 of the desiccant air-conditioning system using the heat pump 200 having such a configuration as a heat source.
The operation when 40B is applied is the same as the process shown by the solid line in the psychrometric chart shown in FIG. 5, and operates as follows. Such an operation mode is performed after the operation for desiccant regeneration before the start is completed and the desiccant's moisture absorbing ability is restored.

The introduced return air (processed air: state K ) is sucked into the blower 102 via the path 107, is pressurized, is sent to the desiccant rotor 103 via the path 108, and adsorbs moisture in the air with the desiccant rotor's moisture absorbent. Then, the absolute humidity decreases and the temperature of the air rises due to the heat of adsorption (state L 2 ). The air whose humidity has decreased and the temperature has increased
9 and sent to the sensible heat exchanger 104 to open air (regenerated air)
Is cooled by heat exchange (state M 2 ). The cooled air is cooled by passing through the evaporator (cooler) 240B via the path 110 (state N 2 ). The cooled processing air is supplied to the humidifier 1
The temperature is reduced by an isenthalpy process by water injection or vaporization type humidification (state P 2 ), and is returned to the air-conditioned space via a path 112 as air supply.

The regeneration of the desiccant rotor is performed as follows. The outside air (state Q 2 ) used as the regenerating air is sucked by the blower 140 via the path 124, pressurized and sent to the sensible heat exchanger 104, and cools the processing air to increase its temperature (state R 2 ). Condenser (heater) via 126
It is sent to 220 and heated by the heat pump to increase the temperature (state S 2 ). Further, a condenser (heater) 220
The regenerated air that has exited via the auxiliary heating means 210 via a path 127
However, since the auxiliary heating means 210 is not operating, the states S and T remain the same, and the temperature eventually rises to 60 to 80 ° C. (state T 2 ), and the relative humidity decreases. The regeneration air having a reduced relative humidity passes through the desiccant rotor 103 to remove moisture from the desiccant rotor and perform a regeneration operation.
The regenerated air that has passed through the desiccant rotor 103
9, flows into the evaporator 240A, but the evaporator 240A is not operating and is not cooled (state U = state
V ) It is discarded outside as exhaust gas through the path 130.

When the evaporator 240B, which has a heat exchange relationship with the processing air after passing through the desiccant 103, is operated in this way, the desiccant regeneration and the dehumidification and cooling of the processing air are repeatedly performed, so that the air conditioning by the desiccant is performed. It can be carried out. In addition, although the method of using the exhaust accompanying the indoor ventilation as the regeneration air has been widely used in the desiccant air conditioning, the exhaust from the room may be used as the regeneration air in the present invention. Similar effects can be obtained.

[0028]

As described above, according to the present invention, the drive system for the heat pump and the regeneration air is started in the air conditioning system in which the desiccant adsorption process of the desiccant and the desiccant regeneration process by the heat pump can be continuously performed. By operating before and recovering the sensible heat from the treated air after passing through the desiccant and heating the regenerated air before passing through the desiccant, the desiccant adsorption capacity at startup is improved, and the starting characteristics are improved and energy saving is achieved. In addition, since the capacity of the auxiliary heating means can be reduced, an air conditioning system with low initial cost can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a basic configuration of an embodiment of an air conditioning system according to the present invention.

FIG. 2 is an explanatory diagram showing a desiccant air-conditioning cycle of air of the air-conditioning system of FIG. 1 in a psychrometric chart.

FIG. 3 is an explanatory diagram showing a basic configuration of a conventional air conditioning system.

FIG. 4 is an explanatory diagram showing a configuration of a virtual air conditioning system.

FIG. 5 is an explanatory diagram showing a basic configuration of an air conditioning system according to the example of FIG.

[Description of Signs] 102, 140 Blower 103 Desiccant rotor 104 Sensible heat exchanger 200 Heat pump 220 Evaporator 240, 240B Condenser 260 Compressor 270 Switching valve 310 Auxiliary heating means 350 Controller A Processing air path B Regeneration air path

Claims (6)

[Claims] 1. A desiccant that adsorbs moisture in process air in a process air path and is regenerated by regenerating air in a regenerating air path; and a steam having a compressor, two selectively switchable evaporators and a condenser. A compression refrigeration cycle, wherein one of the two evaporators has a heat exchange relationship with the regenerated air after desiccant passage, and the other has a heat exchange relationship with the treated air after desiccant passage, and is condensed. Is connected in a heat exchange relationship with the regenerated air before passing through the desiccant, and the evaporator that makes a heat exchange relationship with the regenerated air after passing through the desiccant acts to recover heat from the regenerated air after passing through the desiccant and pass through the desiccant. Heat the previous regenerated air or use an evaporator that has a heat exchange relationship with the treated air after desiccant passage to recover heat from the treated air before desiccant passage. An air conditioning system characterized in that it is possible to select whether to heat the regeneration air before passing through the desiccant. 2. An auxiliary heating means is provided upstream of the desiccant of the regenerated air and downstream of the condenser to recover heat from the regenerated air after passing the desiccant and to heat the regenerated air before passing the desiccant. The air conditioning system according to claim 1, wherein the regeneration air is heated by a heating unit. 3. The air conditioning system according to claim 2, wherein the auxiliary heating means is an electric heater. 4. The air conditioning system according to claim 2, wherein the auxiliary heating means is a heat exchanger using steam as a heat source. 5. The air conditioning system according to claim 2, wherein the auxiliary heating means is a heat exchanger using hot water as a heat source. 6. A desiccant that adsorbs moisture in the processing air in the processing air path and is regenerated by the regeneration air in the regeneration air path; and a steam having a compressor, two selectively switchable evaporators and a condenser. A compression refrigeration cycle, wherein one of the two evaporators has a heat exchange relationship with the regenerated air after desiccant passage, and the other has a heat exchange relationship with the treated air after desiccant passage, and is condensed. In an operation method of an air conditioning system in which a heat exchanger is connected to the regenerated air before desiccant passage, the evaporator having a heat exchange relationship with regenerated air after desiccant is actuated to generate regenerated air after desiccant passage. When heating the regenerated air before passing the desiccant by recovering heat from the desiccant, operate the regenerated air blower and stop the process air When an evaporator that has a heat exchange relationship with the subsequent processing air is actuated to recover heat from the processing air before passing through the desiccant and heat the regeneration air before passing through the desiccant, both the blower of the regeneration air and the blower of the processing air A method for controlling an air conditioning system, comprising: