JP6084485B2 - Absorption heat pump and operation method of absorption heat pump - Google Patents

Description

  The present invention relates to an absorption heat pump and an operation method of the absorption heat pump, and more particularly to an absorption heat pump having a simplified apparatus configuration and an operation method of the absorption heat pump.

  There are a heat source machine such as a refrigerator and a heat pump (narrow sense) as a device that performs heat transfer using the principle of a heat pump (wide sense) that moves heat from a low temperature portion to a high temperature portion. Heat source machines that use solutions and refrigerants as working media are classified as absorption types, which are evaporators that evaporate refrigerant liquid, absorbers that absorb refrigerant vapor with solutions, and regenerators that remove refrigerant from solutions. A condenser for condensing the refrigerant vapor is provided as a main component, and the solution and the refrigerant are circulated while appropriately changing the concentration and the phase, thereby transferring heat. An absorption refrigerator used as a cold heat source and an absorption heat pump used as a heat source have a common point in the main configuration. However, both have the following differences in operation. First, the absorption refrigerator cools the target medium by taking the latent heat of evaporation when the refrigerant in the evaporator evaporates from the medium to be used (target medium). On the other hand, the absorption heat pump heats the target medium with heat absorbed when the solution in the absorber absorbs the refrigerant vapor generated in the evaporator.

  In the absorption chiller, in order to promote the evaporation of the refrigerant liquid in the evaporator, a refrigerant liquid spray nozzle for spraying the refrigerant liquid is provided in the evaporator, and the refrigerant liquid is sprayed toward the heat transfer tube through which the target medium flows ( For example, see Patent Document 1.) On the other hand, the evaporator in the absorption heat pump plays a role of generating the refrigerant vapor to be absorbed in the solution of the absorber by heating with a heating medium such as hot water, but the structure is the same as that of the evaporator of the absorption refrigerator. A refrigerant liquid spray nozzle is provided to follow the structure and spray the refrigerant liquid (see, for example, Patent Document 2).

JP 2009-299936 A (paragraph 0016, FIG. 1 etc.) JP 2010-255904 A (paragraph 0017, FIG. 1 etc.)

  As an apparatus configuration of the heat source machine, it is preferable to simplify as much as possible from the viewpoints of improvement in reliability and manufacturing economy.

  In view of the above-described problems, an object of the present invention is to provide an absorption heat pump with a simplified apparatus configuration and an operation method of the absorption heat pump that contributes to the simplification of the apparatus configuration.

  In order to achieve the above object, an absorption heat pump according to a first aspect of the present invention includes, for example, an evaporator can body 27 that contains a refrigerant in liquid Vf and vapor Ve, and an evaporator can body as shown in FIG. An evaporator 20 having a heat transfer tube 21 provided inside the heat transfer tube 21 and a heat transfer tube 21 through which a heating medium h that heats the refrigerant liquid Vf that is a refrigerant liquid; The liquid level of Vf is equal to or higher than a low level VL that is a predetermined liquid level higher than a height at which a part of the heat transfer tube 21 is exposed within an allowable range, and is equal to or lower than a high level VH that is a predetermined distance above the upper end of the heat transfer tube 21. Liquid level maintaining means 24 and 46 for maintaining the liquid level.

  With this configuration, it is not necessary to provide a spray nozzle for spraying the refrigerant liquid onto the heat transfer tube, the device configuration can be simplified, and the device can be downsized.

  Moreover, the absorption heat pump according to the second aspect of the present invention is, for example, as shown in FIG. 1, in the absorption heat pump 1 according to the first aspect of the present invention, the refrigerant vapor Ve that is the refrigerant vapor from the evaporator 20. And an absorber 10 for absorbing the refrigerant vapor Ve into the solution Sa; a regenerator 30 for heating the solution Sw to remove the refrigerant contained in the solution Sw; and the absorbers Sa and Sw for the absorber 10 and the regenerator 30. And solution pipes 16 and 35 that are circulated through the refrigerant; and a refrigerant purification pipe 28 that guides the refrigerant liquid Vf in the evaporator can body 27 to the regenerator 30, the absorber 10, or the solution pipe 16.

  If comprised in this way, when a solution will mix in a refrigerant | coolant liquid, it will be possible to flow the refrigerant | coolant liquid into a solution system | strain once, and to remove a solution from a refrigerant | coolant liquid, and suppress the fall of the capability of an absorption heat pump be able to.

  Further, the absorption heat pump according to the third aspect of the present invention introduces the refrigerant vapor Vg generated in the regenerator 30 in the absorption heat pump 1 according to the second aspect of the present invention as shown in FIG. A condenser 40 for condensing the refrigerant; a refrigerant liquid pipe 45 for guiding the refrigerant liquid Vf in the condenser 40 to the evaporator can body 27; a refrigerant temperature detector 51 for detecting the temperature of the refrigerant to be condensed or the temperature of the refrigerant to be evaporated; A pressure detector 52 for directly or indirectly detecting the pressure of the gas phase portion directly above the refrigerant whose temperature is detected by the refrigerant temperature detector 51; an open / close valve 29 for the refrigerant purification pipe 28 to open and close the flow path; The converted dew point temperature Tc, which is a value converted to the dew point temperature of the refrigerant at the pressure Pd detected by the pressure detector 52, is compared with the detected refrigerant temperature Td, which is a value detected by the refrigerant temperature detector 51. Detected refrigerant temperature Td Further comprising a control device 99 for the opening and closing valve 29 to open when high predetermined value or more than the converted dew point temperature Tc.

  With this configuration, it is assumed that the detected refrigerant temperature has increased due to the mixing of the solution, and when it is estimated that the solution has mixed into the refrigerant, the refrigerant liquid flows into the refrigerant purification tube. When there is substantially no mixing of the solution, it is possible to prevent the refrigerant liquid from flowing through the refrigerant purification tube, and it is possible to suppress a decrease in the efficiency of the absorption heat pump.

  In addition, the absorption heat pump according to the fourth aspect of the present invention is the absorption heat pump 1 according to the third aspect of the present invention, as shown in FIG. Connected to the evaporator can body 27 so as to open the refrigerant liquid Vf at the bottom; the evaporator 20 guides the saturated refrigerant liquid saturated by the heating of the refrigerant liquid Vf by the heating medium h to the bottom of the evaporator can body 27. It has a downward flow path 25.

  If comprised in this way, the refrigerant | coolant liquid supplied to the bottom part of an evaporator can body will rise, being heated, and raises the temperature of a refrigerant | coolant liquid, a boiling, and the change to a gas-liquid two-phase state stably. And the liquid level of the refrigerant liquid in the evaporator can body can be stabilized. Further, since the evaporator has a descending flow path, the saturated refrigerant liquid boiled near the surface in the evaporator flows into the descending flow path, so that the natural circulation of the refrigerant in the evaporator can be caused. The liquid level of the refrigerant liquid in the can body can be further stabilized.

  In order to achieve the above object, an operation method of the absorption heat pump according to the fifth aspect of the present invention, for example, referring to FIG. 1, is a refrigerant liquid Vf that is a refrigerant liquid stored in the evaporator 20. A heating medium supplying step of flowing a heating medium h for heating the refrigerant liquid Vf into the heat transfer pipe 21 immersed in the heat transfer pipe 21; a liquid level of the refrigerant liquid Vf in which the heat transfer pipe 21 is immersed is a part of the heat transfer pipe 21. A liquid level maintaining step of maintaining the liquid level at a level higher than the low level VL which is a predetermined liquid level higher than the height exposed within the allowable range and below the high level VH which is a position above the upper end of the heat transfer tube 21 by a predetermined distance.

  With this configuration, it is not necessary to provide a spray nozzle for spraying the refrigerant liquid onto the heat transfer tube, the device configuration can be simplified, and the device can be downsized.

  Moreover, the operation method of the absorption heat pump according to the sixth aspect of the present invention is, for example, as shown in FIGS. 1 and 2, in the operation method of the absorption heat pump according to the fifth aspect of the present invention, in the condenser 40. A refrigerant temperature detecting step (S1) for detecting the temperature of the refrigerant condensed in the evaporator 20 or the temperature of the refrigerant evaporating in the evaporator 20; and a gas phase portion immediately above the refrigerant whose temperature is detected in the refrigerant temperature detecting step (S1). A pressure detection step (S2) for detecting the pressure directly or indirectly; a converted dew point temperature Tc which is a value converted into the dew point temperature of the refrigerant at the pressure detected in the pressure detection step (S2), and a refrigerant temperature detection step (S1) In the temperature comparison step (S4) for comparing the detected refrigerant temperature Td, which is the value detected in step), in the temperature comparison step (S4), when the detected refrigerant temperature Td is higher than the converted dew point temperature Tc by a predetermined value or more. ,evaporation The refrigerant liquid Vf stored in 20 absorbs the refrigerant vapor Ve, which is the refrigerant vapor generated in the evaporator 20, and separates the refrigerant vapor Vg to be condensed in the condenser 40 into a system of solutions Sa and Sw. A refrigerant liquid inflow step (S5).

  With this configuration, it is estimated that the cause of the increase in the detected refrigerant temperature is due to the mixing of the solution, and when it is estimated that the solution is mixed in the refrigerant, the refrigerant liquid is caused to flow into the solution system. When there is substantially no contamination of the solution, it is possible to prevent the refrigerant liquid from flowing into the solution system, and it is possible to suppress a decrease in efficiency of the absorption heat pump.

  Moreover, the operating method of the absorption heat pump according to the seventh aspect of the present invention is the operating method of the absorption heat pump according to the fifth aspect or the sixth aspect of the present invention, wherein the heating medium supply step includes the heating medium h ( For example, see FIG. 1) as a whole so as to flow from below to above.

  With this configuration, the amount of heat transferred from the heating medium to the refrigerant liquid can be maximized.

  Moreover, the operating method of the absorption heat pump according to the eighth aspect of the present invention is the operating method of the absorption heat pump according to the fifth aspect or the sixth aspect of the present invention, wherein the heating medium supply step includes the heating medium h ( For example, refer to FIG. 1) as a whole so as to flow downward from above.

  If comprised in this way, the refrigerant | coolant in an evaporator can be evaporated at higher temperature.

  According to the present invention, it is not necessary to provide a spray nozzle for spraying the refrigerant liquid onto the heat transfer tube, the device configuration can be simplified, and the device can be downsized.

1 is a schematic system diagram of an absorption heat pump according to an embodiment of the present invention. It is a flowchart explaining control of refrigerant | coolant reproduction | regeneration. It is a fragmentary perspective view of the evaporator which comprises the absorption heat pump which concerns on the modification of embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or similar members are denoted by the same or similar reference numerals, and redundant description is omitted.

  First, an absorption heat pump 1 according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic system diagram of the absorption heat pump 1. The absorption heat pump 1 includes an absorber 10, an evaporator 20, a regenerator 30, and a condenser 40 that are main components that perform an absorption heat pump cycle, and a solution tube that guides the dilute solution Sw from the absorber 10 to the regenerator 30. The dilute solution pipe 16, the concentrated solution pipe 35 and the solution pump 35 p as solution pipes that guide the concentrated solution Sa from the regenerator 30 to the absorber 10, and the refrigerant liquid pipe that guides the refrigerant liquid Vf in the condenser 40 to the evaporator 20. 45, a gas-liquid separator 80 for gas-liquid separation of the heated medium W heated by the absorber 10, and a control device 99. The absorption heat pump 1 supplies low temperature (for example, about 80 ° C. to 90 ° C.) waste water having a relatively low utility value as a heat source medium to the regenerator 30 and the evaporator 20, and a heated medium vapor Wv ( For example, a pressure exceeding about 0.1 MPa (gauge pressure), desirably about 0.8 MPa (gauge pressure)) can be taken out from the gas-liquid separator 80.

In the following description, the solution is referred to as “dilute solution Sw”, “concentrated solution Sa” or the like depending on the properties and the position on the heat pump cycle in order to facilitate distinction on the heat pump cycle. When the properties and the like are not asked, they are collectively referred to as “solution S”. Further, regarding the refrigerant, in order to facilitate the distinction on the heat pump cycle, “evaporator refrigerant vapor Ve”, “regenerator refrigerant vapor Vg”, “refrigerant liquid Vf” and the like according to the properties and the position on the heat pump cycle. Although it is called, when the property or the like is not asked, it is generally called “refrigerant V”. In the present embodiment, LiBr aqueous solution is used as the solution S (mixture of the absorbent and the refrigerant V), and water (H ₂ O) is used as the refrigerant V. The heated medium W is a heated medium liquid Wq which is a liquid heated medium W, a heated medium vapor Wv which is a gaseous heated medium, and the heated medium liquid Wq and the heated medium vapor Wv are mixed. A general term for the mixed medium Wm to be heated. In the present embodiment, water (H ₂ O) is used as the heating medium W.

  The absorber 10 includes a heating tube 11 that forms a flow path of the medium to be heated W and a concentrated solution spray nozzle 12 that sprays the concentrated solution Sa inside the absorber can body 17. The concentrated solution spray nozzle 12 is disposed above the heating tube 11 so that the sprayed concentrated solution Sa falls on the heating tube 11. The absorber 10 generates heat of absorption when the concentrated solution Sa is sprayed from the concentrated solution spray nozzle 12 and the concentrated solution Sa absorbs the evaporator refrigerant vapor Ve. The heated medium W flowing through the heating tube 11 receives this absorbed heat so that the heated medium W is heated. In the lower part of the absorber 10, a storage part 13 is formed in which the diluted solution Sa that has been dispersed absorbs the evaporator refrigerant vapor Ve to store the diluted solution Sw having a reduced concentration. The heating tube 11 is disposed above the storage unit 13 so as not to be immersed in the dilute solution Sw. The storage unit 13 is provided with an absorber liquid level detector 14 that detects the liquid level of the stored diluted solution Sw.

  The evaporator 20 has a heat transfer tube 21 constituting a flow path of the heat source hot water h as a heating medium inside the evaporator can body 27. The evaporator 20 does not have a nozzle for spraying the refrigerant liquid Vf inside the evaporator can body 27. For this reason, the heat transfer tube 21 is arranged so as to be immersed in the refrigerant liquid Vf stored in the evaporator can body 27 (full liquid evaporator). In general, the evaporator of the “absorption refrigerator” is designed so that the evaporation temperature of the refrigerant liquid is lowered in order to take out the cold water. Therefore, since the evaporation pressure of the refrigerant liquid is set low, the heat transfer tube is immersed in the refrigerant liquid. With the configuration, sufficient ability cannot be obtained. On the other hand, in the absorption heat pump, the pressure in the evaporator is higher than that in the absorption refrigerator, and a desired refrigerant vapor can be obtained even in a configuration in which the heat transfer tube is immersed in the refrigerant liquid. In the absorption heat pump 1 according to the present embodiment, the nozzle for spraying the refrigerant liquid Vf is not provided, and the apparatus configuration is simplified. The evaporator 20 is configured such that the refrigerant liquid Vf around the heat transfer tube 21 is evaporated by the heat of the heat source hot water h flowing in the heat transfer tube 21 to generate the evaporator refrigerant vapor Ve. A refrigerant liquid pipe 45 that supplies the refrigerant liquid Vf into the evaporator can body 27 is connected to the bottom surface of the evaporator can body 27. The refrigerant liquid pipe 45 is branched into a plurality before the evaporator can body 27 so that the refrigerant liquid Vf can be supplied from a plurality of locations on the bottom surface of the evaporator can body 27. A heat source hot water pipe 72 is connected to the heat transfer pipe 21. The heat source hot water pipe 72 is configured so that the flow of the heat source hot water h in the heat transfer pipe 21 flows from the lower side to the upper side, in other words, the heat source hot water h with respect to the refrigerant liquid Vf rising in the evaporator can body 27. It is connected to the heat transfer tube 21 so as to be parallel flow as a whole.

  The absorber can body 17 and the evaporator can body 27 are connected to each other at the upper portion, whereby the absorber 10 and the evaporator 20 communicate with each other in the gas phase portion. Since the absorber 10 and the evaporator 20 communicate with each other in the gas phase portion, the pressures inside the absorber 10 and the evaporator 20 are substantially equal. Further, the absorber 10 and the evaporator 20 communicate with each other so that the evaporator refrigerant vapor Ve generated in the evaporator 20 can be supplied to the absorber 10. The absorber 10 and the evaporator 20 typically communicate with each other above the concentrated solution spray nozzle 12.

  The regenerator 30 has a heat source pipe 31 for flowing heat source hot water h as a heat source medium for heating the dilute solution Sw and a dilute solution spray nozzle 32 for spraying the dilute solution Sw inside the regenerator can body 37. doing. The regenerator 30 is configured such that a concentrated solution Sa whose concentration is increased by evaporation of the refrigerant V from the sprayed diluted solution Sw is stored in the lower part. The regenerator 30 is configured such that when the dilute solution Sw is heated to the heat source hot water h, the refrigerant V in the dilute solution Sw is removed, and the concentrated solution Sa and the regenerator refrigerant vapor Vg are generated. . A portion where the concentrated solution Sa of the regenerator 30 is stored and the concentrated solution spray nozzle 12 of the absorber 10 are connected by a concentrated solution pipe 35 through which the concentrated solution Sa flows. The concentrated solution tube 35 is provided with a solution pump 35p that pumps the concentrated solution Sa of the regenerator 30 to the absorber 10. The solution pump 35p has an inverter 35v connected to the absorber liquid level detector 14 by a signal cable, and the rotational speed is adjusted according to the liquid level detected by the absorber liquid level detector 14, and the absorber. The flow rate of the concentrated solution Sa to be pumped to 10 can be adjusted. The dilute solution spray nozzle 32 and the storage unit 13 of the absorber 10 are connected by a dilute solution tube 16 through which the dilute solution Sw flows. The concentrated solution tube 35 and the diluted solution tube 16 are provided with a solution heat exchanger 38 that performs heat exchange between the concentrated solution Sa and the diluted solution Sw.

  The condenser 40 has a cooling water pipe 41 that forms a cooling medium flow path inside the condenser can body 47. The cooling water c as a cooling medium flows through the cooling water pipe 41. The condenser 40 is configured to introduce the regenerator refrigerant vapor Vg generated in the regenerator 30, cool it with the cooling water c, and condense it. The cooling water pipe 41 is disposed so that the regenerator refrigerant vapor Vg is not immersed in the condensed refrigerant liquid Vf so that the regenerator refrigerant vapor Vg can be directly cooled. The condenser 40 is connected to a refrigerant liquid pipe 45 that sends the condensed refrigerant liquid Vf to the evaporator 20. A refrigerant pump 46 for pumping the refrigerant liquid Vf to the evaporator 20 is disposed in the refrigerant liquid pipe 45.

  The regenerator can body 37 and the condenser can body 47 are connected to each other at the upper portion, so that the regenerator 30 and the condenser 40 communicate with each other in the gas phase portion. Since the regenerator 30 and the condenser 40 communicate with each other in the gas phase portion, the pressures inside the regenerator 30 and the condenser 40 are substantially equal. Further, the regenerator 30 and the condenser 40 communicate with each other so that the regenerator refrigerant vapor Vg generated in the regenerator 30 can be supplied to the condenser 40. The regenerator 30 and the condenser 40 typically communicate with each other above the dilute solution spray nozzle 32.

  In the absorption heat pump 1, since the evaporator 20 is full, the liquid level in the evaporator can body 27 varies depending on the change in the discharge flow rate of the refrigerant pump 46 and the evaporation speed of the refrigerant liquid Vf in the evaporator can body 27. To do. In the evaporator 20, the refrigerant liquid Vf becomes the evaporator refrigerant vapor Ve by obtaining the evaporation heat from the heat transfer pipe 21. From the viewpoint of efficiently transmitting the evaporation heat to the refrigerant liquid Vf, the refrigerant liquid Vf and the heat transfer pipe 21. From the viewpoint of promoting the evaporation of the refrigerant liquid Vf, the heat transfer pipe 21 from the liquid surface of the refrigerant liquid Vf is prevented so that the pressure applied to the refrigerant liquid Vf around the heat transfer pipe 21 does not become excessive. A shallower depth is preferred. In consideration of such circumstances, the evaporator 20 is configured so that the liquid level of the refrigerant liquid Vf in the evaporator can body 27 changes between the low level VL and the high level VH above the low level VL. And an evaporator liquid level detector 24 having a low level detector 24L for detecting the low level VL and a high level detector 24H for detecting the high level VH.

  The lower VL is preferably set at the upper end of the heat transfer tube 21 or above it, but within the range in which the evaporator refrigerant vapor Ve necessary for the generation of absorbed heat in the absorber 10 can be generated (allowable range). The liquid level at which a part of the heat transfer tube 21 is exposed may be set. The high-order VH is set at a position above a predetermined distance from the upper end of the heat transfer tube 21 or below it. Even if the boiling point of the refrigerant liquid Vf in the vicinity of the heat transfer tube 21 is taken into account for the predetermined distance, the evaporator refrigerant vapor Ve required for the generation of absorbed heat in the absorber 10 is taken into consideration. The distance corresponds to the liquid depth that can be generated. The evaporator liquid level detector 24 and the refrigerant pump 46 are connected by a signal cable. The refrigerant pump 46 is configured such that the discharge flow rate is adjusted so that the liquid level of the refrigerant liquid Vf in the evaporator can body 27 changes between the low level VL and the high level VH. The evaporator liquid level detector 24 and the refrigerant pump 46 constitute liquid level maintaining means.

  Further, the evaporator 20 has a downcomer pipe 25 that guides the saturated refrigerant liquid that has become a saturated liquid by heating the refrigerant liquid Vf in the evaporator can body 27 to the bottom of the evaporator can body 27. The descending pipe 25 constitutes a descending flow path. The downcomer pipe 25 is provided outside the evaporator can body 27, and is slightly below the liquid level of the refrigerant liquid Vf (in the present embodiment, in the vicinity of the low level VL between the low level VL and the high level VH) and the bottom surface. In the vicinity, it is connected to the evaporator can body 27. The saturated refrigerant liquid Vf flows through the downcomer pipe 25 and moves to the bottom of the evaporator can body 27, so that natural circulation of the refrigerant liquid Vf occurs inside the evaporator can body 27, and the evaporator can body 27. The liquid level of the refrigerant liquid Vf inside can be stabilized. Instead of the downcomer pipe 25, a flow path (downflow path) for guiding the saturated refrigerant liquid Vf to the bottom may be formed inside the evaporator can body 27.

  Further, one end of a purification pipe 28 as a refrigerant purification pipe is connected to the bottom of the evaporator can body 27. The other end of the purification tube 28 is connected to a regenerator can body 37 so that the refrigerant liquid Vf in the evaporator can body 27 can be guided to the regenerator 30. In general, in the case of the spraying type in which the refrigerant liquid is sprayed by the spray nozzle in the evaporator, not all of the sprayed refrigerant liquid evaporates. A pipe for returning the refrigerant liquid that has not evaporated to the condenser is provided. On the other hand, in the absorption heat pump 1 according to the present embodiment, the evaporator 20 is a full liquid type, and the liquid level of the refrigerant liquid Vf in the evaporator can body 27 changes between the low level VL and the high level VH. Since the flow rate of the introduced refrigerant liquid Vf is adjusted, it is not necessary to derive the refrigerant liquid Vf in the evaporator can body 27 from the viewpoint of adjusting the liquid level of the refrigerant liquid Vf in the evaporator can body 27. . However, when the solution S is mixed with the refrigerant liquid Vf, for example, when the solution S is accompanied by the regenerator refrigerant vapor Vg, when the refrigerant V evaporates in the evaporator 20, the mixed solution S is concentrated and absorbed. There is a possibility that the heat pump 1 may not be able to exhibit the desired ability. Therefore, in the absorption heat pump 1, the refrigerant liquid Vf in the evaporator can body 27 is guided to the regenerator 30 via the purification pipe 28, so that the concentration of the solution S in the evaporator 20 can be avoided. . In addition, by connecting the other end of the purification pipe 28 to the regenerator 30, there is an advantage that the solution S can be rapidly diluted during the dilution operation when the operation of the absorption heat pump 1 is stopped. The purification pipe 28 is provided with an on-off valve 29 for opening and closing the flow path. The on-off valve 29 is connected to the control device 99 by a signal cable, and is configured to be able to open and close the valve based on a control signal from the control device 99.

  The evaporator 20 further detects a temperature sensor 51 as a refrigerant temperature detector for detecting the saturation temperature of the refrigerant V (the temperature of the evaporating refrigerant V), and the pressure in the gas phase portion in the evaporator can body 27. A pressure sensor 52 as a pressure detector is provided. The temperature sensor 51 is preferably arranged to detect the temperature of the refrigerant liquid Vf in the evaporator can body 27 so as to detect the temperature of the saturated liquid having good heat conduction. Each of the temperature sensor 51 and the pressure sensor 52 is connected to the control device 99 via a signal cable, and is configured to be able to transmit the detected value as a signal to the control device 99.

  The gas-liquid separator 80 is a device that introduces the heated medium W that flows through the heating tube 11 of the absorber 10 and separates the heated medium vapor Wv and the heated medium liquid Wq. The gas-liquid separator 80 is provided with a gas-liquid separator liquid level detector 81 that detects the liquid level of the heated medium liquid Wq stored inside. The lower part of the gas-liquid separator 80 and one end of the heating pipe 11 of the absorber 10 are connected by a heated medium liquid pipe 82 that guides the heated medium liquid Wq to the heating pipe 11. The heated medium liquid pipe 82 is provided with a heated medium pump 83 that pumps the heated medium liquid Wq toward the heated pipe 11. The side surface of the gas-liquid separator 80 whose inside is a gas phase portion and the other end of the heating tube 11 are connected by a heated medium tube 84 after heating that guides the heated medium W to the gas-liquid separator 80. Yes.

  The gas-liquid separator 80 is connected to a makeup water pipe 85 that introduces makeup water Ws for supplementing the heated medium W supplied to the outside of the system as steam from outside the system. The make-up water pipe 85 includes a make-up water pump 86 for pumping make-up water Ws toward the gas-liquid separator 80, a check valve 85c, a make-up water heat exchanger 87B for preheating the make-up water Ws with warm water, and a dilute solution. A make-up water heat exchanger 87A that further heats the make-up water Ws by exchanging heat with Sw is arranged in this order toward the flow direction of the make-up water Ws. The make-up water pump 86 is connected to the gas-liquid separator liquid level detector 81 through a signal cable so that the start / stop is controlled according to the liquid level of the heated medium liquid Wq in the gas-liquid separator 80. It is configured. The make-up water heat exchanger 87A is disposed in the make-up water pipe 85 and the dilute solution pipe 16 upstream of the solution heat exchanger 38 so as to exchange heat between the make-up water Ws and the dilute solution Sw. Further, the heated liquid vapor supply pipe 89 for supplying the heated medium vapor Wv to the outside of the system is connected to the upper part (typically the top) of the gas-liquid separator 80.

  The gas-liquid separator 80 may introduce a mixed heated medium Wm in which part of the heated medium liquid Wq is evaporated in the heating tube 11 and the heated medium liquid Wq and the heated medium vapor Wv are mixed. Alternatively, the heated medium liquid Wq may be guided to the gas-liquid separator 80, and the pressure may be reduced to partially vaporize the mixed heated medium Wm for gas-liquid separation. In order to vaporize the medium to be heated Wq under reduced pressure, a throttle means such as an orifice can be used. Whether or not a part of the heated medium liquid Wq is evaporated in the heating pipe 11 is typically determined by adjusting the discharge pressure of the heated medium pump 83 and / or the make-up water pump 86. The internal pressure can be adjusted by whether or not the internal pressure is higher than a saturation pressure corresponding to the temperature of the heated medium liquid Wq.

  The control device 99 is a device that controls the operation of the absorption heat pump 1. The control device 99 is connected to the heated medium pump 83 by a signal cable, and is configured to be able to perform this start / stop and adjustment of the rotation speed. In the above description, the refrigerant pump 35p, which is controlled by directly inputting the output of the absorber liquid level detector 14, and the refrigerant which is controlled by directly inputting the output of the evaporator liquid level detector 24. The replenishing water pump 86 which is controlled by directly inputting the output of the pump 46 and the gas-liquid separator liquid level detector 81 is also connected to the control device 99 via the control device 99 (the output signal of the detector is once sent to the control device 99). It may be controlled by input). The control device 99 is configured to transmit a signal to the on-off valve 29 so that the valve can be opened and closed. Further, the control device 99 is connected to the temperature sensor 51 and the pressure sensor 52 through signal cables, respectively, and is configured to receive the values detected by the temperature sensor 51 and the pressure sensor 52 as signals. Yes. Further, the control device 99 stores the relationship between the pressure of the refrigerant V and the dew point temperature in advance, and is configured so that the pressure transmitted from the pressure sensor 52 can be converted into the dew point temperature at that pressure. Has been.

  With continued reference to FIG. 1, the operation of the absorption heat pump 1 will be described. During the operation of the absorption heat pump 1, the on-off valve 29 is normally closed. First, the refrigerant side cycle will be described. In the condenser 40, the regenerator refrigerant vapor Vg evaporated in the regenerator 30 is received, cooled and condensed with the cooling water c flowing through the cooling water pipe 41, and the refrigerant liquid Vf is obtained. The condensed refrigerant liquid Vf is sent to the evaporator 20 by the refrigerant pump 46 and is introduced into the evaporator can body 27 from the bottom of the evaporator can body 27. At this time, the refrigerant pump 46 according to the detected liquid level of the evaporator liquid level detector 24 so that the liquid level of the refrigerant liquid Vf stored in the evaporator can body 27 falls between the low level VL and the high level VH. Is controlled (liquid level maintaining step). Typically, when the low level detector 24L detects that the liquid level of the refrigerant liquid Vf has fallen to the low level VL, the refrigerant pump 46 is activated, and when the high level detector 24H detects that the liquid level has risen to the high level VH. The refrigerant pump 46 stops.

  On the other hand, heat source hot water h is supplied to the heat transfer tube 21 at least partially immersed in the refrigerant liquid Vf stored in the evaporator can body 27 so as to flow upward from below (heating medium supply step). As the heat source hot water h flows from the lower side to the upper side as a whole in the heat transfer tube 21, the refrigerant liquid Vf can be heated by the high temperature heat source hot water h on the bottom side where the boiling point of the refrigerant liquid Vf is high. Therefore, evaporation heat transfer having a high heat transfer rate can be used as a whole, and the amount of heat transfer from the heat source hot water h (heating medium) to the refrigerant liquid Vf can be maximized. For example, when the heat source hot water h is used at the inlet 85 ° C. and the outlet 82.5 ° C., the boiling point rise due to the liquid depth is about 2 ° C. at 300 mm, so the heat transfer tube 21 is changed to the refrigerant liquid Vf at a depth of 300 mm. When soaked, evaporation heat transfer can be used almost entirely. As described above, the refrigerant liquid Vf stored in the evaporator can body 27 and rising from the bottom in combination with the action of the downcomer pipe 25 has a tendency that the tendency is a counterflow from the heat source hot water h whose tendency is a parallel flow. It is possible to receive a larger amount of heat than in the case where the heat source hot water h flows downward from above. The refrigerant liquid Vf stored in the evaporator can body 27 is heated by the heat source hot water h flowing in the heat transfer tube 21 and evaporated to become the evaporator refrigerant vapor Ve. The evaporator refrigerant vapor Ve generated in the evaporator 20 moves to the absorber 10 that communicates with the evaporator 20.

  Next, the cycle on the solution side of the absorption heat pump 1 will be described. In the absorber 10, the concentrated solution Sa is sprayed from the concentrated solution spray nozzle 12, and the sprayed concentrated solution Sa absorbs the evaporator refrigerant vapor Ve that has moved from the evaporator 20. The concentrated solution Sa that has absorbed the evaporator refrigerant vapor Ve is reduced in concentration to become a diluted solution Sw. In the absorber 10, heat of absorption is generated when the concentrated solution Sa absorbs the evaporator refrigerant vapor Ve. The absorbed medium liquid Wq flowing through the heating tube 11 is heated by the absorbed heat. Here, the operation around the gas-liquid separator 80 for taking out the heated medium vapor Wv will be described.

  The gas-liquid separator 80 is introduced with makeup water Ws from outside the system via a makeup water pipe 85. The make-up water Ws is pumped through the make-up water pipe 85 by the make-up water pump 86. After the temperature rises first in the make-up water heat exchanger 87B, the temperature is further increased by exchanging heat with the diluted solution Sw in the make-up water heat exchanger 87A. Then, it is introduced into the gas-liquid separator 80. The makeup water Ws introduced into the gas-liquid separator 80 is stored in the lower part of the gas-liquid separator 80 as the heated medium liquid Wq. The makeup water pump 86 is controlled so that the heated medium liquid Wq stored in the lower part of the gas-liquid separator 80 becomes a predetermined liquid level. The heated medium liquid Wq stored in the lower part of the gas-liquid separator 80 is sent to the heating pipe 11 of the absorber 10 by the heated medium pump 83. The heated medium liquid Wq sent to the heating tube 11 is heated by the absorption heat described above in the absorber 10. The heated medium liquid Wq heated by the heating tube 11 is gas-liquid separated as a mixed heated medium Wm partially evaporated to become a heated medium vapor Wv, or as a heated medium liquid Wq whose temperature has increased. Flows through the heated medium tube 84 after heating toward the vessel 80. When the heated medium liquid Wq whose temperature has risen flows through the heated medium pipe 84 after heating, the heated medium liquid Wq is depressurized when being introduced into the gas-liquid separator 80, and a part of the heated medium liquid Wq is evaporated and covered The mixed medium to be heated Wm that has become the heating medium vapor Wv is introduced into the gas-liquid separator 80. In the mixed heated medium Wm introduced into the gas-liquid separator 80, the heated medium liquid Wq and the heated medium vapor Wv are separated. The separated heated medium liquid Wq is stored in the lower part of the gas-liquid separator 80 and sent to the heating tube 11 of the absorber 10 again. On the other hand, the separated heated medium vapor Wv is led out to the heated medium vapor supply pipe 89 and supplied to the vapor use place.

  Returning to the description of the cycle on the solution side of the absorption heat pump 1 again. The concentrated solution Sa that has absorbed the evaporator refrigerant vapor Ve by the absorber 10 is reduced in concentration to become the diluted solution Sw, and is stored in the storage unit 13. The dilute solution Sw in the storage unit 13 flows through the dilute solution pipe 16 toward the regenerator 30 due to gravity and a difference in internal pressure between the absorber 10 and the regenerator 30, and is supplied to the replenishing water heat exchanger 87A and the replenishing water Ws. After the exchange and the temperature is lowered, the solution heat exchanger 38 exchanges heat with the concentrated solution Sa to further lower the temperature and reach the regenerator 30. The dilute solution Sw sent to the regenerator 30 is sprayed from the dilute solution spray nozzle 32. The dilute solution Sw sprayed from the dilute solution spray nozzle 32 is heated by the heat source hot water h (about 85 ° C. in this embodiment) flowing through the heat source pipe 31, and the refrigerant in the sprayed dilute solution Sw evaporates. It becomes a concentrated solution Sa (withdrawn) and is stored in the lower part of the regenerator 30. On the other hand, the refrigerant V evaporated from the dilute solution Sw moves to the condenser 40 as a regenerator refrigerant vapor Vg. The concentrated solution Sa stored in the lower part of the regenerator 30 is pumped to the concentrated solution spray nozzle 12 of the absorber 10 through the concentrated solution tube 35 by the solution pump 35p. At this time, the rotational speed of the solution pump 35p is driven by the inverter 35v in accordance with the detected liquid level of the absorber liquid level detector 14 so that the diluted solution Sw stored in the storage unit 13 of the absorber 10 becomes a predetermined liquid level. (As a result, the discharge flow rate) is adjusted. The concentrated solution Sa flowing through the concentrated solution pipe 35 is heat-exchanged with the diluted solution Sw by the solution heat exchanger 38 to rise in temperature, and then flows into the absorber 10 and is sprayed from the concentrated solution spray nozzle 12. Thereafter, the same cycle is repeated.

  In the absorption heat pump 1 that performs the cycle of the solution S and the refrigerant V as described above, the solution S may be mixed into the refrigerant V system as described above. When the solution S is mixed into the refrigerant V, the boiling point of the refrigerant liquid Vf increases according to the amount of the mixed solution S, so that the saturation pressure of the evaporator refrigerant vapor Ve generated in the evaporator 20 decreases, and the absorber 10 Therefore, the absorption heat pump 1 can no longer exhibit a desired capacity. In order to avoid the concentration of the solution S in the evaporator 20, the refrigerant liquid Vf mixed with the solution S is led from the evaporator can body 27 into the regenerator can body 37 through the purification pipe 28 and into the refrigerant V. Refrigerant regeneration to reduce the contained solution S is performed, but if the refrigerant liquid Vf transferred from the evaporator 20 to the regenerator 30 becomes too large, the concentration of the concentrated solution Sa sent to the absorber 10 decreases, The operating efficiency of the absorption heat pump 1 will be reduced. Therefore, the absorption heat pump 1 performs the following control when the cycle of the solution S and the refrigerant V is performed (when the liquid level maintaining process and the heating medium supply process are performed). Yes.

  FIG. 2 is a flowchart for explaining control of refrigerant regeneration. During the normal operation in which the absorption heat pump 1 performs the liquid level maintaining process and the heating medium supply process, the control device 99 receives a signal of the temperature detected by the temperature sensor 51 (hereinafter referred to as “detected refrigerant temperature Td”). (Refrigerant temperature detection step: S1). In parallel, the control device 99 receives a signal of the pressure detected by the pressure sensor 52 (hereinafter referred to as “detected pressure Pd”) (pressure detection step: S2). When receiving the signal of the detected pressure Pd, the control device 99 converts it into a converted dew point temperature Tc that is the dew point temperature of the refrigerant V at the detected pressure Pd based on the relationship between the pressure stored in advance and the dew point temperature ( Dew point temperature conversion step: S3). After obtaining the converted dew point temperature Tc, the control device 99 determines whether or not the value obtained by subtracting the converted dew point temperature Tc from the detected refrigerant temperature Td is equal to or greater than a predetermined value Tp (temperature comparison step: S4).

  As described above, when the solution S is mixed into the refrigerant V, the boiling point of the refrigerant liquid Vf increases according to the amount of the mixed solution S. That is, the dew point temperature of the refrigerant V increases according to the amount of the mixed solution S. Here, since the detected refrigerant temperature Td is the temperature of the refrigerant V that actually evaporates (equivalent to the dew point temperature), if the solution S is mixed, the actual characteristics of the refrigerant V in which it is reflected. Is the dew point temperature. On the other hand, the converted dew point temperature Tc is the dew point temperature of the pure refrigerant V in which impurities such as the solution S are not mixed in the refrigerant V. Therefore, it can be said that the larger the value obtained by subtracting the converted dew point temperature Tc from the detected refrigerant temperature Td, the greater the amount of the solution S mixed into the refrigerant V. When the value obtained by subtracting the converted dew point temperature Tc from the detected refrigerant temperature Td is less than the predetermined value Tp in the temperature comparison step (S4), the control device 99 returns to the refrigerant temperature detection step (S1). On the other hand, when the value obtained by subtracting the converted dew point temperature Tc from the detected refrigerant temperature Td is equal to or greater than the predetermined value Tp, the on-off valve 29 is opened and the refrigerant liquid Vf in the evaporator can body 27 is transferred to the regenerator can body 37. (Refrigerant liquid inflow process: S5). In view of the above, the predetermined value Tp corresponds to an increase in the boiling point of the refrigerant V to such an extent that the amount of the evaporator refrigerant vapor Ve necessary for properly operating the absorption heat pump 1 cannot be generated.

  After opening the on-off valve 29, the control device 99 determines whether or not a predetermined condition is satisfied (S6). The predetermined condition is that when a predetermined time has elapsed after opening the on-off valve 29, or when the value obtained by subtracting the converted dew point temperature Tc from the detected refrigerant temperature Td has dropped to an acceptable value, etc. 27 is to confirm a state in which it can be estimated that the content of the solution S in the refrigerant V in 27 does not hinder the proper operation of the absorption heat pump 1. The control device 99 keeps the on-off valve 29 open until a predetermined condition is satisfied. On the other hand, when the predetermined condition is satisfied, the on-off valve 29 is closed (S7). When the on-off valve 29 is closed, the flow returns to the refrigerant temperature detection step (S1) again, and the above-described flow is repeated thereafter. In FIG. 2, for convenience of explanation, the refrigerant temperature detection step (S1), the pressure detection step (S2), and the dew point temperature conversion step (S3) are displayed in this order, but ideally these steps are performed simultaneously. Therefore, the order of the refrigerant temperature detection step (S1), the pressure detection step (S2), and the dew point temperature conversion step (S3) may be interchanged.

  As described above, the absorption heat pump 1 is configured so that the evaporator 20 is a full liquid type in which the heat transfer tube 21 is immersed in the refrigerant liquid Vf, so that the spray nozzle that spreads the refrigerant liquid Vf into the evaporator 20 is provided. This eliminates the need for the apparatus configuration, simplifies the size of the apparatus, and improves the reliability. In addition, since the purification pipe 28 that guides the refrigerant liquid Vf in the evaporator can body 27 to the regenerator can body 37 is provided, the refrigerant V can be regenerated and the solution S can be rapidly diluted during the dilution operation. Can do. In addition, the regeneration of the refrigerant V is performed when the value obtained by subtracting the converted dew point temperature Tc from the detected refrigerant temperature Td becomes equal to or higher than the predetermined value Tp. Can be suppressed.

  In the above description, the introduction of the refrigerant liquid Vf into the evaporator can body 27 is performed by the refrigerant liquid pipe 45 that is branched into a plurality and connected to the bottom. However, as shown in FIG. A spray tube 22A (see FIG. 3A) configured by connecting a plurality of perforated tubes having a plurality of holes 22h formed at appropriate intervals, or a spray solution configured by bending one tube 22h. A pipe 22B (see FIG. 3B) is installed at the bottom of the evaporator can body 27, and a refrigerant liquid pipe 45 is connected to the spray pipe 22A or the spray pipe 22B. The liquid Vf may be supplied. If it does in this way, the refrigerant | coolant liquid Vf which raises the inside of the evaporator can body 27 will become a uniform flow, and the liquid level of the refrigerant | coolant liquid Vf can be stabilized more.

  In the above description, the purifying pipe 28 has one end connected to the evaporator can body 27 and the other end connected to the regenerator can body 37, but the other end of the purifying pipe 28 is connected to the absorber can body. 17 or the dilute solution tube 16 may be connected. That is, it is only necessary that the refrigerant liquid Vf in the evaporator can body 27 can be guided to any of the systems of the solution S. However, considering the pressure relationship in each can body, the dilution operation, and the like, it is preferable that the other end of the purification tube 28 is connected to the regenerator can body 37.

  In the above description, the open / close valve 29 is provided in the purification pipe 28, and when the value obtained by subtracting the converted dew point temperature Tc from the detected refrigerant temperature Td becomes equal to or higher than the predetermined value Tp, the open / close valve 29 is opened to open the evaporator can body. 27, the refrigerant liquid Vf in the evaporator can body 37 is guided to the regenerator can body 37. However, instead of the on-off valve 29, a throttle mechanism such as an orifice is provided to continuously regenerate the refrigerant liquid Vf in the evaporator can body 27 little by little. It is good also as guiding to the can body 37. In this case, in addition to the on-off valve 29, the temperature sensor 51 and the pressure sensor 52 for obtaining the detected refrigerant temperature Td and the converted dew point temperature Tc are not required, and the apparatus configuration can be simplified.

  In the above description, the temperature sensor 51 and the pressure sensor 52 are provided in the evaporator can body 27 to detect the saturation temperature of the refrigerant V and the pressure in the gas phase portion in the evaporator can body 27. It is good also as detecting in the condenser can body 47 the saturation temperature of the refrigerant | coolant V in the condenser can body 47, and the pressure of a gaseous-phase part. However, since the working pressure in the evaporator can body 27 is higher than that in the condenser can body 47, it is easy to detect the internal pressure, and it is difficult to be affected by the non-condensable gas that has been present in the machine. Therefore, the temperature sensor 51 and the pressure sensor 52 are preferably provided in the evaporator can body 27.

  In the above description, the temperature sensor 51 and the pressure sensor 52 are both provided in the evaporator can body 27. However, the absorber can body 17 communicates with the evaporator can body 27, and the internal pressure of both of them is Since the pressure sensors 52 are substantially equal, the pressure sensor 52 may be provided in the absorber can body 17 to indirectly detect the pressure in the gas phase portion in the evaporator can body 27. However, from the viewpoint of detecting a more accurate pressure in the gas phase portion in the evaporator can body 27, the pressure sensor 52 is provided on the upper portion of the evaporator can body 27, and therefore, the gas phase portion in the evaporator can body 27. It is preferable to directly detect the pressure. Similarly, when the temperature sensor 51 and the pressure sensor 52 are provided in the condenser can body 47, the pressure sensor 52 is provided in the regenerator can body 37 communicating with the condenser can body 47. It is good also as detecting the pressure of the gaseous-phase part indirectly.

  In the above description, the heat source hot water pipe 72 is connected so that the heat source hot water h supplied to the heat transfer pipe 21 flows from the lower side to the upper side as a whole. The heat source hot water pipe 72 may be connected so as to flow downward. Assuming that the heat source hot water h flows through the heat transfer tube 21 as a whole from the upper side to the lower side, the temperature of the heat source hot water h is higher at the upper side and lower at the lower side. As the liquid Vf rises, heat exchange is performed with the heat source hot water h having a high temperature, and in the lower part, the refrigerant liquid Vf that evaporates upward is preheated, so that the refrigerant liquid Vf is heated at a higher temperature. Can be evaporated. In this case, it is more effective if a baffle plate for suppressing the convection of the refrigerant liquid Vf is installed in the evaporator can body 27.

  In the above description, the heating medium supplied to the heat transfer tube 21 of the evaporator 20 and the heat source medium supplied to the heat source tube 31 of the regenerator 30 are both the heat source hot water h. Alternatively, one may be heat source hot water h and the other may be steam. That is, the heating medium and the heat source medium may be any fluid that retains heat that can be used to drive the absorption heat pump.

  In the above description, the heat output (heated medium W) extracted from the absorption heat pump 1 is steam (heated medium vapor Wv), but it may be warm water (heated medium liquid Wq). When the heat output taken out from the absorption heat pump 1 is hot water, the replenishment water pipe 85 is connected to the heated medium liquid pipe 82 while omitting the gas-liquid separator 80 and the heated medium pump 83, and the replenishment water Ws is supplied to the heated medium. The liquid Wq may be supplied to the heating tube 11 so that the heated medium liquid Wq whose temperature has risen is taken out from the heated medium pipe 84 after heating.

  In the above description, the absorption heat pump 1 is a single-stage absorption heat pump including one absorber 10 and one evaporator 20, but the absorber 10 and the evaporator 20 are composed of two or three sets having different operating temperatures. It is good also as a multi-stage absorption heat pump of the above structure, and having two or three stages. The technology relating to the regeneration of the refrigerant V that suppresses the reduction of the operation efficiency can be applied to the multistage absorption heat pump.

DESCRIPTION OF SYMBOLS 1 Absorption heat pump 10 Absorber 16 Dilute solution pipe | tube 20 Evaporator 21 Heat transfer pipe 24 Evaporator liquid level detector 25 Falling pipe 27 Evaporator can body 28 Purifying pipe 29 On-off valve 30 Regenerator 35 Concentrated solution pipe 40 Condenser 45 Refrigerant Liquid pipe 51 Temperature sensor 52 Pressure sensor 99 Control device h Heat source hot water S Solution Sa Concentrated solution Sw Dilute solution Tc Equivalent dew point temperature Td Detection refrigerant temperature V Refrigerant Ve Evaporator refrigerant vapor Vf Refrigerant liquid Vg Regenerator refrigerant vapor VH High level VL Low level

Claims (8)

An evaporator can body that contains the refrigerant in liquid and vapor, and a heat transfer tube provided inside the evaporator can body, through which a heating medium that heats the refrigerant liquid that is the liquid of the refrigerant flows. An evaporator having;
An absorber that introduces refrigerant vapor, which is vapor of the refrigerant, from the evaporator and absorbs the refrigerant vapor into a solution;
The level of the refrigerant liquid in the evaporator can body is exposed to a high level where a part of the heat transfer tube is exposed within an allowable range capable of generating the refrigerant vapor necessary for generating absorption heat in the absorber. is more lower than is predetermined liquid level, and, from the upper end of the heat transfer tube, the absorption in the absorber even in consideration of the boiling point rise of the refrigerant liquid around the heat transfer tube by the liquid level rise of the refrigerant fluid Liquid level maintaining means for maintaining below a high level which is a position above a predetermined distance corresponding to a liquid depth capable of generating the refrigerant vapor necessary for generating heat ;
Absorption heat pump. A regenerator for heating the solution to release the refrigerant contained in the solution;
A solution tube for circulating the solution through the absorber and the regenerator;
A refrigerant purification pipe that guides the refrigerant liquid in the evaporator can body to the regenerator, the absorber, or the solution pipe;
The absorption heat pump according to claim 1. A condenser for introducing and condensing the refrigerant vapor generated in the regenerator;
A refrigerant liquid pipe for guiding the refrigerant liquid in the condenser to the evaporator can body;
A refrigerant temperature detector for detecting a temperature of the refrigerant to be condensed or a temperature of the refrigerant to be evaporated;
A pressure detector for directly or indirectly detecting the pressure of the gas phase portion directly above the refrigerant whose temperature is detected by the refrigerant temperature detector;
The refrigerant purification pipe has an on-off valve for opening and closing the flow path;
The detected refrigerant is compared by comparing a converted dew point temperature which is a value converted into a dew point temperature of the refrigerant at a pressure detected by the pressure detector with a detected refrigerant temperature which is a value detected by the refrigerant temperature detector. A control device that opens the on-off valve when the temperature is higher than the converted dew point temperature by a predetermined value or more;
The absorption heat pump according to claim 2. An evaporator can body that contains the refrigerant in liquid and vapor, and a heat transfer tube provided inside the evaporator can body, through which a heating medium that heats the refrigerant liquid that is the liquid of the refrigerant flows. An evaporator having;
The liquid level of the refrigerant liquid in the evaporator can body is set to a predetermined distance from a lower level that is a predetermined liquid level higher than a height at which a part of the heat transfer tube is exposed within an allowable range and a predetermined distance from the upper end of the heat transfer tube. Liquid level maintaining means for maintaining the upper position below the high level ;
An absorber that introduces refrigerant vapor, which is vapor of the refrigerant, from the evaporator and absorbs the refrigerant vapor into a solution;
A regenerator for heating the solution to release the refrigerant contained in the solution;
A solution tube for circulating the solution through the absorber and the regenerator;
A refrigerant purification pipe for guiding the refrigerant liquid in the evaporator can body to the regenerator, the absorber, or the solution pipe ;
A condenser for introducing and condensing the refrigerant vapor generated in the regenerator;
A refrigerant liquid pipe for guiding the refrigerant liquid in the condenser to the evaporator can body;
A refrigerant temperature detector for detecting a temperature of the refrigerant to be condensed or a temperature of the refrigerant to be evaporated;
A pressure detector for directly or indirectly detecting the pressure of the gas phase portion directly above the refrigerant whose temperature is detected by the refrigerant temperature detector;
The refrigerant purification pipe has an on-off valve for opening and closing the flow path;
The detected refrigerant is compared by comparing a converted dew point temperature which is a value converted into a dew point temperature of the refrigerant at a pressure detected by the pressure detector with a detected refrigerant temperature which is a value detected by the refrigerant temperature detector. further Bei example a control unit the temperature is the on-off valve to open when higher than a predetermined value than the conversion dew point temperature;
The refrigerant liquid tube is connected to the evaporator can body so as to open the refrigerant liquid at the bottom of the evaporator can body;
The evaporator has a downward flow path that guides a saturated refrigerant liquid saturated by the refrigerant liquid being heated by the heating medium to the bottom of the evaporator can body;
Absorption heat pump. A heating medium supply step of flowing a heating medium for heating the refrigerant liquid into a heat transfer tube immersed in the refrigerant liquid which is a refrigerant liquid stored in the evaporator;
Generation of absorption heat in an absorber in which the liquid level of the refrigerant liquid in which the heat transfer tube is immersed is absorbed by a solution in which a part of the heat transfer tube absorbs the refrigerant vapor that is the vapor of the refrigerant. lower than is predetermined liquid level above the height exposed within a tolerance that can generate the refrigerant vapor required, and, from the upper end of the heat transfer tubes, the heat transfer by the liquid level rise of the refrigerant fluid Even if the boiling point rise of the refrigerant liquid around the heat pipe is taken into consideration, it is below a high level that is a position above a predetermined distance corresponding to the liquid depth that can generate the refrigerant vapor necessary for generating the absorption heat in the absorber. A liquid level maintaining step to maintain;
Operation method of absorption heat pump. A refrigerant temperature detecting step of detecting a temperature of the refrigerant condensed in the condenser or a temperature of the refrigerant evaporated in the evaporator;
A pressure detection step of directly or indirectly detecting the pressure of the gas phase portion directly above the refrigerant whose temperature has been detected in the refrigerant temperature detection step;
A temperature comparison step of comparing a converted dew point temperature that is a value converted to a dew point temperature of the refrigerant at a pressure detected in the pressure detection step with a detected refrigerant temperature that is a value detected in the refrigerant temperature detection step;
In the temperature comparison step, when the detected refrigerant temperature is higher than the converted dew point temperature by a predetermined value or more, the refrigerant liquid stored in the evaporator is used as the vapor of the refrigerant generated by the evaporator. A refrigerant liquid inflow process for allowing the refrigerant vapor to be absorbed and flowing into a solution system for releasing the refrigerant vapor to be condensed by the condenser;
The operation method of the absorption heat pump according to claim 5. The heating medium supplying step is configured to flow the heating medium as a whole from below to above;
The operation method of the absorption heat pump of Claim 5 or Claim 6. The heating medium supplying step is configured to flow the heating medium as a whole from above to below;
The operation method of the absorption heat pump of Claim 5 or Claim 6.

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