JP5783550B2 - Heat pump system - Google Patents

Description

  The present invention relates to a heat pump system, and is particularly useful when applied to a frost-free (non-frosting) operation in a heat pump system using air as a heat source.

  The basic configuration of a heat pump using air as a heat source according to the prior art includes a compressor that compresses a refrigerant, a condenser or a gas cooler that heats a heated medium using a high-temperature and high-pressure refrigerant compressed by the compressor A first heat exchanger formed by the above, an expansion valve for expanding the refrigerant heat-exchanged by the first heat exchanger, and evaporating the low-temperature refrigerant expanded by the expansion valve to exchange heat with air It has the 2nd heat exchanger formed with the evaporator which returns the refrigerant | coolant after heat exchange to the said compressor, and it compresses through a 1st heat exchanger, an expansion valve, and a 2nd heat exchanger from a compressor. By forming a refrigerant circulation path to the machine, the medium to be heated in the first heat exchanger is heated using the heat of air (see, for example, Patent Document 1).

JP 2010-54136 A

  In the heat pump system using air as a heat source as described above, frost forms on the second heat exchanger functioning as an evaporator during low-temperature and high-humidity operation, resulting in a decrease in the amount of heat received and a deterioration in heat transfer performance. . For this reason, when frost formation is detected, defrost operation is performed. Such defrost operation causes the second heat exchanger to function as a condenser or a gas cooler. As a result, when performing the defrost operation, it is basically necessary to interrupt the original operation mode of the heat pump system, that is, heating of the medium to be heated and cooling of the medium to be cooled. In order to continue heating the medium to be heated even during the defrosting operation, there is also proposed a system in which two systems of the second heat exchanger are prepared and the switching operation is performed so that one of them always functions as an evaporator. . However, in any case, it is necessary to switch the operation mode to the defrost operation mode.

  In view of the above prior art, the present invention provides a heat pump system that prevents frost formation of a heat exchanger that exchanges heat with air without performing defrost operation and enables frost-free (non-frosting) operation. Objective.

A first aspect of the present invention that achieves the above object includes a compressor that compresses a refrigerant, and a first heat exchanger that heats a medium to be heated using a high-temperature and high-pressure refrigerant compressed by the compressor. An expansion valve that expands the refrigerant heat-exchanged by the first heat exchanger, and a heat exchanger with an adsorbent that evaporates the low-temperature refrigerant expanded by the expansion valve and exchanges heat with air. And a third heat that is an air heat exchanger that further exchanges heat between the air evaporated by the second heat exchanger and heat-exchanged with air and the air, and returns the air to the compressor. The air that performs heat exchange in the exchanger, the second heat exchanger, and the third heat exchanger is circulated from the second heat exchanger side toward the third heat exchanger side. air flow path and the other expansion valves provided between the second heat exchanger outlet side and the third inlet side of the heat exchanger of for Which has a said air flow path, said air inlet and having a second heat exchanger side of the air inlet and the third heat exchanger side of the air outlet opening to the outside, and an air outlet And a mode in which air that has flowed in from the air suction port is heat-exchanged by the second and third heat exchangers and discharged from the air discharge port. The heat pump system includes switching means for switching between modes in which air is circulated through the bypass passage while exchanging heat with the second and third heat exchangers.

According to this aspect, the second heat exchanger with adsorbent and the third heat exchanger are connected in series so that both function as an evaporator, and the air exchanged heat by the second heat exchanger is Since heat can be further exchanged in the third heat exchanger, moisture in the air is adsorbed to the second heat exchanger, and heat exchange with the dehumidified and dried air is performed in the third heat exchanger. Can be made. Here, by the evaporation temperature of the third heat exchanger is above the dew point temperature of the air heat exchanger, that give to prevent frost formation in the third heat exchanger.

Thus, the frost-free operation can be performed without hindering the original operation mode of the heat pump (without performing the defrost operation). Furthermore, according to this aspect, by circulating the air desorbed in the desorption mode operation, the exhaust loss becomes zero, and heat can be continuously recovered in the first heat exchanger, and at the same time, the desorption air By circulating this, the evaporation temperature in the third heat exchanger can be raised, and as a result, the heat exchange efficiency can be improved.

Furthermore, an adsorption mode operation is performed in which the second heat exchanger functions as a heat exchanger (hereinafter referred to as an “adsorption heat exchanger”) that is an evaporator having an adsorption function by adiabatically expanding the refrigerant with an expansion valve. Therefore, dehumidification drying of the air to be heat exchanged can be performed. At the same time, the third heat exchanger connected in tandem to the second heat exchanger can function as an evaporator by expanding the refrigerant heat-exchanged by the second heat exchanger using another expansion valve. . Here, the third heat exchanger is heat-exchanged by the second heat exchanger, dehumidified and dried, and can exchange heat with air whose dew point temperature is lower than the evaporation temperature of the third heat exchanger. Therefore, frost formation in the third heat exchanger can be satisfactorily prevented.

The results, (without the defrost operation) without heat Toponpu original operation mode is inhibited to allow frost-free operation.

  Furthermore, in this aspect, the evaporation temperature in the third heat exchanger can be controlled by adjusting the opening of the other expansion valve, and the second heat exchanger functioning as an adsorption heat exchanger and the third Since the refrigerant evaporating temperatures in the heat exchangers are different, the latent heat and sensible heat of the heat source air can be used separately in the adsorption process of the adsorbent.

  On the other hand, by fully opening the expansion valve so as not to function, the desorption functioning the second heat exchanger as a heat exchanger that is a condenser or gas cooler having a desorption function (hereinafter referred to as “desorption heat exchanger”). Mode operation can be performed. In this case, the other expansion valve is throttled so that only the third heat exchanger functions as an evaporator. As a result, water can be desorbed from the adsorbent by raising the temperature of the air to be heat exchanged by the second heat exchanger. Here, since the third heat exchanger functions as an evaporator, the heating of the medium to be heated by the first heat exchanger can be continued.

  The air that has been heat-exchanged by the second heat exchanger functioning as a desorption heat exchanger and is in a high-temperature and high-humidity state is heat-exchanged by the third heat exchanger, whereby latent heat and sensible heat are recovered. As a result, the condensed moisture in the air is discharged to the outside as it is. That is, the moisture adhering to the adsorbent by the adsorption mode operation can be discharged by the third heat exchanger using air flowing from the second heat exchanger toward the third heat exchanger as a medium. As a result, the adsorbent is regenerated so that moisture can be adsorbed again.

According to a second aspect of the present invention, there is provided the heat pump system according to the first aspect, wherein the expansion valve can be bypassed.

  According to this aspect, it is possible to reduce the pressure loss associated with the passage of the refrigerant in the expansion valve portion when the second heat exchanger functions as a desorption heat exchanger.

According to a third aspect of the present invention, in the heat pump system according to the first or second aspect, a gas-liquid separator is disposed between the second heat exchanger and the other expansion valve, The heat pump system is configured to return the gas component of the refrigerant separated by the gas-liquid separator to the middle of the refrigerant suction port and the refrigerant discharge port of the compressor.

  According to this aspect, it is possible to reduce the compression power of the compressor.

According to a fourth aspect of the present invention, in the heat pump system according to any one of the first to third aspects, a dew point on the outlet side of the second heat exchanger of the air flowing through the air flow path. A heat pump system having dew point measurement means for measuring temperature.

  According to this aspect, it is possible to detect the time when frost formation occurs in the third heat exchanger. That is, it is possible to detect the time point at which the heat pump system should start the desorption mode operation.

According to a fifth aspect of the present invention, in the heat pump system according to the fourth aspect, the expansion valve and the other expansion valve until the dew point temperature detected by the dew point measuring means reaches a predetermined first threshold value. While performing adsorption mode operation in which both the second and third heat exchangers function as evaporators, the expansion valve is opened when the first threshold is reached, and the other expansion valves are operated. Control to perform desorption mode operation that causes the second heat exchanger to function as a condenser or a gas cooler, and to return to the adsorption mode operation after the dew point temperature reaches a predetermined second threshold value The heat pump system further comprises means.

  According to this aspect, the heat pump system can be continuously operated while automatically switching between the adsorption mode operation and the desorption mode operation.

According to a sixth aspect of the present invention, in the heat pump system according to any one of the first to third aspects, an inlet side and an outlet side of a second heat exchanger for air flowing through the air flow path, In the heat pump system, there is provided an equilibrium adsorption state detecting means for detecting an equilibrium adsorption state of the adsorbent based on output signals of the first and second sensors that respectively measure the physical quantity in.

  According to this aspect, the equilibrium adsorption state of the adsorbent can be detected based on the signals of the first and second sensors. As a result, it is possible to detect the time point at which the heat pump system should start the desorption mode operation.

According to a seventh aspect of the present invention, in the heat pump system according to the sixth aspect, the expansion valve and the other expansion valve are throttled until the equilibrium adsorption state is detected. While performing an adsorption mode operation in which all the exchangers function as evaporators, the expansion valve is opened when the equilibrium adsorption state is detected, the other expansion valve is throttled, and the second heat exchanger is operated. A heat pump system characterized by further comprising control means for performing a desorption mode operation for functioning as a condenser or a gas cooler, and further controlling to return to the adsorption mode operation after the release of the equilibrium adsorption state is detected. is there.

  According to this aspect, the heat pump system can be continuously operated while automatically switching between the adsorption mode operation and the desorption mode operation.

According to an eighth aspect of the present invention, in the heat pump system according to any one of the first to third aspects, the expansion valve and the expansion valve until a predetermined first set time set in a timer elapses. While performing the adsorption mode operation in which both the second and third heat exchangers function as an evaporator by restricting the other expansion valve, the expansion valve is opened after the elapse of the first set time, A desorption mode operation is performed in which the second heat exchanger functions as a condenser or a gas cooler by restricting another expansion valve, and after the second set time set in the timer has elapsed, the adsorption mode operation is performed. It has in the heat pump system characterized by having a control means to control to return to.

  According to this aspect, the heat pump system can be continuously operated while automatically switching between the adsorption mode operation and the desorption mode operation.

  According to the present invention, the second heat exchanger with an adsorbent using air as a heat source can function as an adsorption heat exchanger and can also function as a desorption heat exchanger. In the third heat exchanger in the former case, heat is exchanged with the second heat exchanger, dehumidified and dried, and heat exchange is performed with air whose dew point temperature is lower than the evaporation temperature of the third heat exchanger. Therefore, even if the outside air temperature decreases, frost formation in the third heat exchanger can be prevented and a good frost-free operation can be performed. On the other hand, in the latter case, moisture can be desorbed from the adsorbent by raising the temperature of the air to be heat-exchanged by the second heat exchanger. That is, the adsorbent can be regenerated. At this time, since the third heat exchanger functions as an evaporator, the heating function of the heated medium in the first heat exchanger is not interrupted.

  As described above, according to the present invention, the heat pump that heats the heated medium using air as a heat source while repeating the adsorption of moisture by the adsorbent and the desorption / regeneration of moisture from the adsorbent in the second heat exchanger. Frost-free operation can be continued without disturbing the original function of the system.

It is a block diagram which shows the heat pump system which concerns on the 1st Embodiment of this invention. It is a block diagram at the time of adsorption mode operation in the heat pump system shown in FIG. It is a block diagram at the time of the desorption mode driving | operation in the heat pump system shown in FIG. It is a figure which shows an example of the control in the case of adsorption | suction and desorption operation in embodiment of FIG. 1, (a) is the schematic which extracts and shows a part of heat pump system which concerns on this form, (b) is the control operation | movement. It is a flowchart which shows. It is a block diagram in adsorption | suction mode at the time of applying the heat pump system shown in FIG. 1 to a hot-water supply system. It is a block diagram in the removal | desorption mode at the time of applying the heat pump system shown in FIG. 1 to a hot-water supply system. It is a block diagram which shows the heat pump system which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the heat pump system which concerns on the 3rd Embodiment of this invention. It is a figure which shows an example of the control in the case of adsorption | suction and desorption operation in other embodiment of this invention, (a) is the schematic which extracts and shows a part of heat pump system which concerns on this form, (b) is the figure It is a flowchart which shows control operation. It is a figure which shows the other example of the control in the case of adsorption | suction and desorption operation in other embodiment of this invention, (a) is the schematic which extracts and shows a part of heat pump system which concerns on this form, (b) Is a flowchart showing the control operation.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<First Embodiment>
FIG. 1 is a block diagram showing a heat pump system according to a first embodiment of the present invention. As shown in the figure, the heat pump system according to the present embodiment includes a compressor 1 that compresses a refrigerant, a first heat exchanger 2, an expansion valve 3, and a second heat exchanger that is a heat exchanger with an adsorbent. 4. By forming a refrigerant circulation path that returns to the compressor 1 through the expansion valve 5 and the third heat exchanger 6, air exchanged by the second and third heat exchangers 4 and 6 is used as a heat source. As described above, the medium to be heated which is heat-exchanged by the first heat exchanger 2 is heated. Here, the first heat exchanger 2 are constituted by a gas cooler in the case of using a condenser or CO ₂ refrigerant for heating the heated medium using a high-temperature and high-pressure refrigerant compressed by the compressor 1. The second heat exchanger 4 functions as an adsorption heat exchanger for evaporating the low-temperature refrigerant expanded by the expansion valve 3 and exchanging heat with air, and as a desorption heat exchanger by fully opening the expansion valve 3. Is also configured to function. The third heat exchanger 6 is connected in tandem with the second heat exchanger 4 and always functions as an evaporator.

  The air flow path 7 uses the second heat exchanger 4 and the third heat exchanger 6 to exchange heat with each other, and the fan 8 sucks the air from the second heat exchanger 4 to the third heat exchanger. Distribute toward the 6th side. More specifically, the air flow path 7 basically sucks the outside air OA from the air intake port on the second heat exchanger 4 side, and causes the second heat exchanger 4 and the third heat exchanger 6 to flow. After passing, the exhaust EA is configured to be discharged from the air exhaust port on the third heat exchanger 6 side. Furthermore, the air flow path 7 has a bypass passage 9 for circulating the circulating air RA between the air inlet on the second heat exchanger 4 side and the air outlet on the third heat exchanger 6 side. In addition, dampers 10, 11, and 12 are provided as switching means for switching the air passage. Here, the damper 10 is in the vicinity of the air inlet and upstream of the outlet of the bypass passage 9, the damper 11 is in the vicinity of the air outlet and downstream of the inlet of the bypass passage 9, and the damper 12 is in the middle of the bypass passage 9. Each is arranged. Thus, in a state where the dampers 10 and 11 are opened and the damper 12 is closed, the outside air OA that has flowed in from the air suction port exchanges heat with the second and third heat exchangers 4 and 6 from the air discharge port. Circulating air RA is circulated through the bypass passage 9 while exchanging heat with the second and third heat exchangers in the state in which the exhaust EA is discharged and the dampers 10 and 11 are closed and the damper 12 is opened. The operation is performed in two types of modes.

  Absolute humidity sensors 13 and 14 are disposed on the inlet side and the outlet side of the second heat exchanger 4 in the air flow path 7. It is possible to detect that the adsorbent has reached the equilibrium adsorption state by comparing the absolute humidity between the inlet side and the outlet side of the second heat exchanger 4 measured by the absolute humidity sensors 13 and 14. This is because there is no difference in absolute humidity between the inlet side and the outlet side of the heat exchanger 4 in the equilibrium adsorption state.

  In this embodiment, an adsorption mode operation in which the second heat exchanger 4 functions as an adsorption heat exchanger that evaporates the low-temperature refrigerant expanded by the expansion valve 3 and exchanges heat with air, and the expansion valve 3 is fully opened. By doing so, two types of operations can be performed: a desorption mode operation in which the second heat exchanger functions as a desorption heat exchanger.

  The operation of the heat pump system according to this embodiment will be described together with the modes of the adsorption mode operation and the desorption mode operation. FIG. 2 is a block diagram showing the mode during the adsorption mode operation, and FIG. 3 is a block diagram showing the mode during the desorption mode operation.

  In the adsorption mode operation shown in FIG. 2, the first and second expansion valves 3 and 5 are throttled, the second heat exchanger 4 functions as an adsorption heat exchanger, and the third heat exchanger 6 is used as an evaporator. This is done by making it function. In the operation mode, the dampers 10 and 11 are opened, the damper 12 is closed, the outside air OA is taken in from the air suction port of the air flow path 7, and moisture is exchanged with the heat exchange in the second heat exchanger 4. The adsorbed air AA that has been adsorbed and dried is further subjected to heat exchange by the third heat exchanger 6, and then discharged from the air discharge port as exhaust EA.

  In such adsorption mode operation, the refrigerant that has been compressed by the compressor 1 to high temperature and high pressure heats the medium to be heated by the first heat exchanger 2 that functions as a condenser or a gas cooler, and then the first expansion valve 3. To. The second heat exchanger 4 functions as an adsorption heat exchanger by adiabatic expansion of the refrigerant by the first expansion valve 3 to perform dehumidification drying of the air exchanged by passing through the air flow path 7. Can do. At the same time, the refrigerant heat exchanged by the second heat exchanger 4 is expanded by the second expansion valve 5, and the third heat exchanger 6 connected in tandem to the second heat exchanger 4 is used as an evaporator. Can function. Here, in the third heat exchanger 6, heat is exchanged in the second heat exchanger 4 and dehumidified and dried, and the adsorbed air AA and heat in which the dew point temperature is lower than the evaporation temperature of the third heat exchanger 6. Since they can be exchanged, frost formation in the third heat exchanger 6 can be prevented.

  As a result, the frost-free operation can be performed without hindering the original operation of the heat pump system that heats the medium to be heated. Here, by adjusting the opening degree of the second expansion valve 5, the evaporation temperature in the third heat exchanger 6 can be controlled, and the second heat exchanger 4 functioning as an adsorption heat exchanger, Since the refrigerant evaporating temperatures in the third heat exchanger 6 are different, the latent heat and sensible heat of the heat source air can be used separately in the adsorption process of the adsorbent.

  If the adsorption mode operation is continued, the adsorbent in the second heat exchanger 4 is in an equilibrium adsorption state, and the ability to adsorb and remove moisture in the air is lost. Therefore, when the adsorbent is in an equilibrium adsorption state, it is necessary to regenerate the adsorbent by performing a desorption mode operation. Therefore, when the equilibrium adsorption state is detected by the absolute humidity sensors 13 and 14, the operation is shifted to the desorption mode operation.

  In the desorption mode operation shown in FIG. 3, the first expansion valve 3 is fully opened and only the second expansion valve 5 is throttled so that the second heat exchanger 4 functions as a desorption heat exchanger. It is performed by causing only the heat exchanger 6 to function as an evaporator. Further, in the operation mode, the dampers 10 and 11 are closed and the damper 12 is opened so that the desorption air DA exchanged by the second heat exchanger 4 is circulated as the circulating air RA through the bypass passage 9. .

  Even in such a desorption mode operation, the refrigerant that has been compressed by the compressor 1 to a high temperature and high pressure heats the medium to be heated by the first heat exchanger 2. Thereafter, the refrigerant passes through the first expansion valve 3 without being expanded and reaches the second heat exchanger 4. As a result, the second heat exchanger 4 functions as a desorption heat exchanger. Along with this, the temperature of the air exchanged in the second heat exchanger 4 is raised, and water is desorbed from the adsorbent to reach the third heat exchanger 6 as high temperature and high humidity desorbed air DA. Here, since the refrigerant cooled by performing heat exchange with the second heat exchanger 4 is adiabatically expanded by the second expansion valve 5, the third heat exchanger 6 functions as an evaporator. The refrigerant saturation temperature at this time is set to be lower than the dew point temperature of the desorption air DA and higher than 0 degrees. As a result, the heating of the medium to be heated by the first heat exchanger 2 can be continued.

  On the other hand, the desorption air DA that has become a high-temperature and high-humidity state by heat exchange in the second heat exchanger 4 is heat-exchanged by the third heat exchanger 6 to recover latent heat and sensible heat. As a result, the moisture in the desorption air DA is discharged to the outside as it is. That is, the water adhering to the adsorbent by the adsorption mode operation is discharged by the third heat exchanger 6 using the desorption air DA flowing from the second heat exchanger 4 toward the third heat exchanger 6 as a medium. Can do. As a result, the adsorbent is regenerated and water can be adsorbed again. In the case of this embodiment, the reproduction completion state is detected by the absolute humidity sensors 13 and 14.

  Here, in this embodiment, the bypass passage 9 is provided to circulate the air (desorption air DA, circulating air RA), but this eliminates exhaust loss and improves system performance. . That is, by desorbing the desorption air DA, it is possible to recover all the desorption process consumption energy as the evaporation heat of the heat pump system. However, if only the desorption function is considered, the bypass passage 9 is not always necessary in principle.

  In the adsorption mode operation and the desorption mode operation as described above, as a control means (not shown), a predetermined process is performed based on a signal representing the absolute humidity measured by the absolute humidity sensors 13 and 14, and the operations of the expansion valves 3, 5 and the like are performed. This is done by controlling. This control mode will be further described with reference to FIG.

  FIG. 4 is a diagram for explaining a control mode in the adsorption and desorption operations in the present embodiment, (a) is a schematic diagram showing an extracted part of the heat pump system according to the present embodiment, and (b) is its control. It is a flowchart which shows operation | movement. In FIG. 4A, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and redundant description is omitted.

  As shown in both figures, in this embodiment, when the relationship between the absolute humidity X1 of the air detected by the absolute humidity sensor 13 and the absolute humidity X2 of the air detected by the absolute humidity sensor 14 is X2 <X1, the adsorption mode Operation is performed (see step S1). Next, when it is detected that the value of (X1-X2) is less than the predetermined threshold value Xadth (see step S2), the operation is switched to the desorption mode operation, and the desorption mode operation is performed under the condition of X2> X1. Perform (see step S3). Finally, when it is detected that the value of (X2-X1) has become less than the predetermined threshold value Xdeth (see step S4), the operation returns to the suction mode operation, and the same operation is repeated thereafter. In addition, although this example comprised the equilibrium adsorption state detection means using the absolute humidity sensors 13 and 14, it is not restricted to this. It is also possible to configure the same equilibrium adsorption state detection means by collecting data such as other physical quantities such as relative humidity and air temperature and performing a predetermined calculation process.

  FIG. 5 is a block diagram in an adsorption mode when the heat pump system according to the present embodiment is applied to a hot water supply system, and FIG. 6 is a block diagram in a desorption mode. As shown to both figures, the said hot-water supply system is a case where the to-be-heated medium heated with the 1st heat exchanger 2 is used as hot water. In the hot water supply system, continuous frost-free operation is possible without hindering the hot water supply function, that is, without interrupting the heating of hot water in the first heat exchanger 2. Here, the hot water heated by exchanging heat in the first heat exchanger 2 is stored in the tank 15 and is circulated between the first heat exchanger 2 by the pump 16. is there.

  In FIG. 5 and FIG. 6, the same parts as those in FIG. 2 and FIG.

<Second Embodiment>
FIG. 7 is a block diagram showing a heat pump system according to the second embodiment of the present invention. In FIG. 7, the same parts as those in FIG. As shown in FIG. 7, the heat pump system according to this embodiment includes a pipe line 17 that bypasses the first expansion valve 3 and an on-off valve 18, and the second heat exchanger 4 is a desorption heat exchanger. In the desorption mode operation to be performed, the on-off valve 18 is closed to guide the refrigerant to the pipe line 17 so that the first expansion valve 3 is bypassed.

  According to this form, when making the 2nd heat exchanger 4 function as a desorption heat exchanger, pressure loss can be reduced compared with the case where a refrigerant is allowed to pass through the 1st expansion valve 3.

<Third Embodiment>
FIG. 8 is a block diagram showing a heat pump system according to the third embodiment of the present invention. In FIG. 8, the same parts as those in FIG. As shown in the figure, in the heat pump system according to this embodiment, a gas-liquid separator 19 is disposed between the second heat exchanger 4 and the second expansion valve 5 and separated by the gas-liquid separator 19. The gas component of the refrigerant is returned to the middle of the refrigerant suction port and the refrigerant discharge port of the compressor 1 through the pipe line 20.

  According to this embodiment, it is possible to reduce the compression power of the compressor.

<Other embodiments>
In the above embodiment, the expansion valve 5 is also disposed between the second heat exchanger 4 and the third heat exchanger 6, but this is not always necessary. This is because even when the expansion valve 5 is not provided, the frost-free operation in the third heat exchanger 6 can be performed as described above.

  In the above embodiment, a pair of absolute humidity sensors are disposed on the inlet side and the outlet side of the second heat exchanger 4 in the air flow path 7 in order to detect the time point when switching to the desorption operation. This is not a limitation. This is because it is possible to perform the adsorption mode operation and the desorption mode operation using other sensors or the like. Another specific example will be described with reference to FIGS.

  FIG. 9 is a diagram for explaining another control mode at the time of adsorption and desorption operation, (a) is a schematic diagram showing an extracted part of the heat pump system in that case, and (b) is the control operation. It is a flowchart to show. In FIG. 9, the same parts as those in FIG. 4 are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 9A, in this example, the dew point temperature DP of air detected by the dew point temperature sensor 23 disposed in the air flow path 7 on the outlet side of the second heat exchanger 4, and the third heat The evaporating temperature Te detected by the temperature sensor 24 disposed in the refrigerant flow path on the outlet side of the exchanger 6 is used as a control parameter. That is, when the relationship between the dew point temperature DP and the evaporation temperature Te is DP <Te, the adsorption mode operation is performed (see step S11). Next, when it is detected that the value of (Te−DP) is less than the predetermined threshold value Tadth (see step S12), the operation mode is switched to the desorption mode operation, and the desorption mode operation is performed under the condition of DP> Te. Perform (see step S13). Finally, when it is detected that the value of (DP−Te) has become less than the predetermined threshold value Tdeth (see step S14), the operation returns to the suction mode operation, and the same operation is repeated thereafter.

  FIG. 10 is a diagram for explaining still another control mode during the adsorption and desorption operation, in which (a) is a schematic diagram showing an extracted part of the heat pump system in that case, and (b) is its control operation. It is a flowchart which shows. In FIG. 10, the same parts as those in FIG.

  As shown in FIG. 10A, in this example, the air temperature (outside air temperature) Ta in the air flow path 7 on the inlet side of the second heat exchanger 4 is detected by the temperature sensor 33, and this temperature Ta The predetermined control is performed by managing the set times τad and τde based on a predetermined time constant corresponding to the above. That is, the suction mode operation is performed for a predetermined set time τad (see step S21). Next, when the set time τad reaches a predetermined threshold value τadth (see step S22), switching to the desorption mode operation is performed, and during the predetermined set time τde, the desorption mode operation is performed (see step S23). Finally, when the set time τde reaches the predetermined threshold value τdeth (see step S24), the suction mode operation is returned to, and the same operation is repeated thereafter.

  Moreover, in the said Example, although the switching means of the flow path in the air flow path 7 was formed with the dampers 10-12, it is not restricted to this. There is no particular limitation as long as it has a function of switching channels. For example, a valve or the like may be used.

  INDUSTRIAL APPLICABILITY The present invention can be effectively used in an industrial field where a heat exchange device such as a heat pump is manufactured and sold.

DESCRIPTION OF SYMBOLS 1 Compressor 2 1st heat exchanger 3 1st expansion valve 4 2nd heat exchanger
DESCRIPTION OF SYMBOLS 5 2nd expansion valve 6 3rd heat exchanger 7 Air flow path 9 Bypass path 10, 11, 12 Damper 13, 14 Absolute humidity sensor 17 Pipe line 18 On-off valve 19 Gas-liquid separator
20 pipeline

Claims (8)

A compressor for compressing the refrigerant;
A first heat exchanger that heats the medium to be heated using a high-temperature, high-pressure refrigerant compressed by the compressor;
An expansion valve for expanding the refrigerant heat-exchanged in the first heat exchanger;
A second heat exchanger that is a heat exchanger with an adsorbent that evaporates a low-temperature refrigerant expanded by the expansion valve and exchanges heat with air;
A third heat exchanger, which is an air heat exchanger that further exchanges heat between the refrigerant evaporated by the second heat exchanger and heat-exchanged with air and the air, and returns the air to the compressor;
An air flow for circulating the air that performs heat exchange between the second heat exchanger and the third heat exchanger from the second heat exchanger side toward the third heat exchanger side. Road ,
Having another expansion valve provided between the outlet side of the second heat exchanger and the inlet side of the third heat exchanger;
The air flow path has an air inlet on the second heat exchanger side that opens to the outside and an air outlet on the third heat exchanger side, and air between the air inlet and the air outlet. Has a bypass passage for circulating
Further, while the air flowing in from the air suction port is heat-exchanged by the second and third heat exchangers and discharged from the air discharge port, heat exchange is performed by the second and third heat exchangers. A heat pump system comprising switching means for switching between modes in which air is circulated through the bypass passage. In the heat pump system according to claim 1 ,
A heat pump system configured to bypass the expansion valve. In the heat pump system according to claim 1 or claim 2 ,
A gas-liquid separator is disposed between the second heat exchanger and the other expansion valve, and the gas component of the refrigerant separated by the gas-liquid separator is discharged from the refrigerant suction port of the compressor and the refrigerant discharge. A heat pump system configured to return to the middle of the exit. The heat pump system according to any one of claims 1 to 3,
A heat pump system comprising dew point measuring means for measuring a dew point temperature of the air flowing through the air flow path on the outlet side of the second heat exchanger. In the heat pump system according to claim 4 ,
Until the dew point temperature detected by the dew point measuring means reaches a predetermined first threshold value, both the second and third heat exchangers function as an evaporator by restricting the expansion valve and the other expansion valve. Desorption that allows the second heat exchanger to function as a condenser or a gas cooler by opening the expansion valve when the first threshold value is reached and restricting the other expansion valve while the adsorption mode operation is performed A heat pump system further comprising control means for performing mode operation and controlling the dew point temperature to return to the adsorption mode operation after reaching a predetermined second threshold value. The heat pump system according to any one of claims 1 to 3,
An equilibrium adsorption state of the adsorbent is detected based on output signals of first and second sensors that respectively measure physical quantities of the air flowing through the air flow path at the inlet side and the outlet side of the second heat exchanger. A heat pump system comprising an equilibrium adsorption state detection means. In the heat pump system according to claim 6 ,
Until the equilibrium adsorption state is detected, the expansion valve and the other expansion valve are throttled to perform an adsorption mode operation in which both the second and third heat exchangers function as an evaporator, while the equilibrium adsorption is performed. When the state is detected, the expansion valve is opened, and the other expansion valve is throttled to perform a desorption mode operation in which the second heat exchanger functions as a condenser or a gas cooler. A heat pump system further comprising control means for controlling to return to the adsorption mode operation after the release is detected. The heat pump system according to any one of claims 1 to 3,
An adsorption mode in which the second and third heat exchangers function as evaporators by restricting the expansion valve and the other expansion valve until a predetermined first set time set in a timer elapses. On the other hand, after the first set time has elapsed, the expansion valve is opened, and the other expansion valve is throttled to perform the desorption mode operation in which the second heat exchanger functions as a condenser or a gas cooler. The heat pump system further comprises control means for controlling to return to the adsorption mode operation after a second set time set in the timer has elapsed.