JP5384072B2 - Absorption type water heater - Google Patents

Description

  The present invention relates to an absorption chiller / heater that uses exhaust heat supplied from other equipment as a heat source of a regenerator that evaporates and separates refrigerant by heating an absorption liquid.

  In the conventional absorption chiller / heater, a regenerator equipped with a combustion device, a condenser that cools and condenses the refrigerant generated in the regenerator with cooling water, and the refrigerant condensed in the condenser is a secondary refrigerant. Absorbing liquid pipe and refrigerant are vacuum evaporators that are sprayed and re-evaporated on heat transfer tubes through which (water) circulates, and absorbers that absorb the re-evaporated refrigerant into concentrated absorbent and generate a rare absorbent. It connects with a pipe | tube, circulates an absorption liquid and a refrigerant | coolant, controlling the combustion quantity of the said combustion apparatus, and supplies the said secondary refrigerant | coolant to load. In recent years, it has a waste heat regenerator that recovers heat from exhaust heat exhausted from co-generation systems, etc. that promoted energy saving, and uses the exhaust heat to consume fuel consumed by the combustion device. An exhaust heat recovery type absorption chiller / heater that can reduce the amount of heat is proposed. (For example, refer to Patent Document 1.)

In the absorption chiller / heater of Patent Document 1, combustion heat generated when natural gas or the like is burned by the gas burner 1 </ b> A and supplied from other equipment such as a cogeneration system via the exhaust heat fluid supply pipe 30. Since the absorbing liquid is heated and boiled using the exhaust heat fluid to be heated as a heat source, the thermal efficiency is high. Therefore, there is a merit that it is resource saving and the amount of carbon dioxide emission can be reduced.
Japanese Patent Laid-Open No. 2005-300069

  However, when the exhaust heat is supplied, the amount of heat recovered from the exhaust heat supplied through the exhaust heat fluid supply pipe 30 is controlled without performing the combustion operation of the gas burner 1A (combustion device). In the case of performing the hot water supply operation, the rare absorbing liquid sent from the absorber 7 is sent to the high temperature regenerator 1, and this rare absorbing liquid is supplied to the gas burner 1A. It has to be heated by the high-temperature regenerator 1 by combustion of the (combustion device), and this improvement has been desired from the viewpoint of preventing global warming.

  In view of the above, the present invention provides an absorption chiller / heater that can perform sufficient heat recovery from the exhaust heat and that can utilize the heat recovery from the exhaust heat even during hot water supply operation. is there.

The absorption chiller / heater of the present invention includes a high-temperature regenerator heated by a heating device such as a burner , a low-temperature regenerator, a condenser arranged in parallel to the low-temperature regenerator , an evaporator, and an absorber. A waste heat regenerator that recovers heat by a heat transfer pipe for a waste heat regenerator through which a waste heat fluid supplied from another facility such as a co-generation system flows through a waste heat fluid supply pipe , and a waste heat regenerator arranged in parallel to the waste heat regenerator. The absorption liquid pipe and the refrigerant pipe are connected so that the absorption liquid and the refrigerant circulate through the heat condenser, and the rare absorption liquid in the absorber is conveyed by the absorption liquid pump to exchange heat with the heat transfer pipe for the exhaust heat regenerator. And a cold / hot water pipe to which heated or cooled water is supplied via a heat transfer pipe installed in the evaporator, and the supply of the exhaust heat fluid to the heat transfer pipe for the exhaust heat regenerator is the heating priority to heating by the device absorption type cold In the water machine,
An evaporator heat transfer tube disposed in the refrigerant liquid stored in the evaporator and disposed so that the exhaust heat fluid flows;
A flow path switching valve for switching whether the exhaust heat fluid flows to the exhaust heat regenerator heat transfer pipe or to the evaporator heat transfer pipe ;
During the cold water supply operation in which cold water is supplied from the cold / hot water pipe, the exhaust heat fluid flows to the exhaust heat regenerator heat transfer pipe by the flow path switching valve, but does not flow to the evaporator heat transfer pipe,
During the hot water supply operation in which hot water is supplied from the cold / hot water pipe, the exhaust heat fluid flows to the evaporator heat transfer pipe but does not flow to the exhaust heat regenerator heat transfer pipe by the flow path switching valve. It is characterized by.

In the present invention, during cold water supply operation in which cold water is supplied from a cold / hot water pipe installed in the evaporator, the exhaust heat fluid supplied from other equipment such as a co-generation system flows to the heat transfer pipe for the exhaust heat regenerator. The refrigerant does not flow to the heat exchanger tube, but the refrigerant absorbs the refrigerant by the absorber and heats the exhaust heat fluid of the absorption liquid whose concentration is reduced, whereby the refrigerant is concentrated by evaporating and separating. Also, during the hot water supply operation in which hot water is supplied from the cold / hot water pipe, hot water is generated by the condensing action of the refrigerant by controlling the exhaust heat fluid to flow to the evaporator heat transfer pipe but not to the exhaust heat regenerator heat transfer pipe. The improvement of an effect can be aimed at and the absorption type cold / hot water machine improved rather than before can be provided. Furthermore, in the cold water supply operation (cooling operation), the exhaust heat fluid flows into the heat transfer pipe for the exhaust heat regenerator but does not flow into the heat transfer pipe for the evaporator, and the supply of the exhaust heat fluid has priority over the combustion of the gas burner. In the hot water supply operation, the fuel consumption in the gas burner can be reduced by utilizing the heat recovery of the exhaust heat fluid, and an economical operation promoting energy saving can be performed. Furthermore , in the state where the exhaust heat fluid is not supplied, the cold water supply operation (cooling operation) and the hot water supply operation (heating operation) can be performed by the heating action of the absorbing liquid in the high temperature regenerator by the combustion of the gas burner. For this reason, the absorption-type cold / hot water machine which can perform the cold water supply operation (cooling operation) and warm water supply operation (heating operation) improved compared with the past can be provided.

The absorption chiller / heater of the present invention includes a high-temperature regenerator heated by a heating device such as a burner , a low-temperature regenerator, a condenser arranged in parallel to the low-temperature regenerator , an evaporator, and an absorber. A waste heat regenerator that recovers heat by a heat transfer pipe for a waste heat regenerator through which a waste heat fluid supplied from another facility such as a co-generation system flows through a waste heat fluid supply pipe , and a waste heat regenerator arranged in parallel to the waste heat regenerator. The absorption liquid pipe and the refrigerant pipe are connected so that the absorption liquid and the refrigerant circulate through the heat condenser, and the rare absorption liquid in the absorber is conveyed by the absorption liquid pump to exchange heat with the heat transfer pipe for the exhaust heat regenerator. And a cold / hot water pipe to which heated or cooled water is supplied via a heat transfer pipe installed in the evaporator, and the supply of the exhaust heat fluid to the heat transfer pipe for the exhaust heat regenerator is the heating priority to heating by the device absorption type cold In water machine, the evaporator heat transfer tube is disposed so that the exhaust heat fluid immersed in the coolant liquid reserved in the evaporator flows is provided, the exhaust heat fluid flows into the exhaust heat regenerator heat transfer tube Or a flow path switching valve for switching between the flow to the evaporator heat transfer pipe, and during the cold water supply operation in which cold water is supplied from the cold / hot water pipe, the exhaust heat fluid is regenerated as the exhaust heat by the flow path switching valve. At the time of hot water supply operation in which hot water is supplied from the cold / hot water pipe, the exhaust heat fluid is transferred to the evaporator heat transfer pipe by the flow path switching valve when flowing to the evaporator heat transfer pipe but not to the evaporator heat transfer pipe. Will flow but will not flow to the heat transfer pipe for the exhaust heat regenerator , and examples of the present invention will be described below.

  Next, an embodiment of the absorption chiller / heater of the present invention will be described. FIG. 1 is a piping configuration diagram of an absorption chiller / heater according to the present invention, FIG. 2 is a diagram showing a flow of fluid in a chilled water supply operation (cooling operation) of the absorption chiller / heater according to the present invention, and FIG. It is a figure which shows the flow of the fluid in the hot water supply operation (heating operation) of the absorption-type cold / hot water machine which concerns on invention.

  The absorption chiller / heater 100 according to the present invention uses water as a refrigerant and lithium bromide (LiBr) as an absorbent, 1 is a high-temperature regenerator, and in the gas burner 1A which is a heating device This is a regenerator that uses the generated combustion heat as a heating source of the absorbing liquid, heats and boils the absorbing liquid, evaporates and separates the refrigerant sent to the evaporator 6, and concentrates and regenerates the absorbing liquid. Reference numeral 2 denotes a low-temperature regenerator, which uses the refrigerant vapor supplied from the high-temperature regenerator 1 as a heating source for the absorbing liquid. Reference numeral 3 denotes an exhaust heat regenerator, which uses an exhaust heat fluid supplied from another facility such as a cogeneration system as a heating source.

  Further, 4 is a condenser arranged in parallel with the low-temperature regenerator 2 so that the refrigerant vapor evaporated and separated from the absorption liquid in the low-temperature regenerator 2 can flow in, and 5 is evaporated and separated from the absorption liquid in the exhaust heat regenerator 3. An exhaust heat condenser arranged in parallel with the exhaust heat regenerator 3 so that the refrigerant vapor can flow in, an absorber arranged in parallel with the evaporator 6 so that the refrigerant vapor evaporated in the evaporator 6 can flow in, and 8 Low-temperature heat exchanger, 9 is a high-temperature heat exchanger, 10 is a refrigerant pump, 11 and 12 are absorption liquid pumps, 13 is a flow control valve composed of a three-way valve, 14 to 17 are on-off valves, 18 to 23 are absorption liquid pipes, Reference numerals 24 to 29 are refrigerant pipes, 30 is a waste heat fluid supply pipe, 31 is a bypass pipe, 32 is a cold / hot water pipe, 33 is a cooling water pipe, 34 is a pressure equalizing pipe, and these are connected by piping and installed in the evaporator 6. Water cooled / heated to a predetermined temperature via the pipe wall of the heat transfer pipe 6A is passed through the cold / hot water pipe 32. Is circulated and supplied can be configured to the heat load (not shown). As will be described later, the flow control valve 13 is a flow control valve that controls the heat input amount of the exhaust heat fluid supplied from the exhaust heat fluid supply pipe 30 to the exhaust heat regenerator 3.

  Further, in the exhaust heat regenerator 3, a heat transfer pipe for exhaust heat regenerator 3 </ b> B having exhaust heat fluid supply pipes 30 connected to both ends is disposed, and an absorption liquid discharge port is provided at the bottom of the exhaust heat regenerator 3. 3A is provided. One end of an absorption liquid pipe 19 is connected to the discharge port 3A, and the absorption liquid of the exhaust heat regenerator 3 located higher than the discharge port 3A is regenerated at a high temperature by the operation of the absorption liquid pump 12 interposed in the absorption liquid pipe 19. It is provided in the container 1 so that conveyance is possible. The heat transfer tube 3B is installed in the middle portion of the exhaust heat regenerator 3 so that the entire heat transfer tube 3B is positioned above the discharge port 3A for the absorbing liquid.

  In addition, a spreader 3C is installed above the heat transfer tube 3B, and one end of the absorption liquid pipe 18 is connected to the spreader 3C, and the refrigerant is absorbed by the operation of the absorption liquid pump 11 interposed in the absorption liquid pipe 18. Thus, the rare absorption liquid in the absorber 7 whose concentration has been reduced is configured to be sprayable on the heat transfer tube 3B.

  In addition, a temperature sensor 35 is provided on the outlet side of the evaporator 6 in the cold / hot water pipe 32 to exchange heat with the refrigerant through the tube wall of the heat transfer pipe 6A in the evaporator 6 and is cooled by latent heat when the refrigerant evaporates. Thus, the temperature of the cold / hot water discharged from the evaporator 6 can be measured. Further, a control unit 36 for controlling the gas burner 1A, the refrigerant pump 10, the absorption liquid pump 11, the absorption liquid pump 12, the flow rate control valve 13 and the like based on the temperature of the cold / hot water measured by the temperature sensor 35 is also provided. Yes.

  In the present invention, an evaporator heat transfer pipe 6B for heating and evaporating the liquid refrigerant accumulated at the bottom of the evaporator 6 with the exhaust heat fluid of the exhaust heat fluid supply pipe 30 is disposed in the evaporator 6 below the heat transfer pipe 6A. It is provided to be immersed in the stored refrigerant liquid. Then, switching of whether the exhaust heat fluid of the exhaust heat fluid supply pipe 30 flows to the heat transfer pipe 3B side or the heat transfer pipe 6B side is performed by a flow path switching valve. In one configuration, as shown in FIGS. 1 to 3, branch portions S <b> 1 and S <b> 2 to the heat transfer tube 6 </ b> B control the heat input amount of the exhaust heat fluid supplied to the heat transfer tube 3 </ b> B of the exhaust heat regenerator 3. The exhaust heat regenerator 3 is branched from the flow rate control valve 13. For this reason, branch portions S1 and S2 are provided in the midway of the exhaust heat fluid forward path 30A and the return path 30B of the exhaust heat fluid supply pipe 30 at a position closer to the exhaust heat regenerator 3 than the flow rate control valve 13, and this branch section S1. The forward path 6B1 and the return path 6B2 of the heat transfer tube 6B are connected to S2. Then, the flow path switching valves 37A and 37B are provided in the branch portions S1 and S2 to switch whether the exhaust heat fluid of the exhaust heat fluid supply pipe 30 flows to the heat transfer pipe 3B side or the heat transfer pipe 6B side. .

  First, the cold water supply operation (cooling operation) will be described with reference to FIG. In the absorption chiller / heater 100 having the above-described configuration, the flow path switching valves 37A and 37B can be switched in conjunction with the chilled water supply operation (cooling operation) if the exhaust heat fluid is available. The flow path switching valves 37A and 37B are switched to the heat transfer tube 3B side on the exhaust heat regenerator 3 side based on the operation of the cold water supply operation (cooling operation) switch. That is, the exhaust heat fluid flowing in from the inlet of the exhaust heat fluid supply pipe 30 flows from the forward path 30A through the heat transfer pipe 3B and returns from the return path 30B, and the exhaust heat fluid does not flow to the heat transfer pipe 6B. The on-off valves 14 to 17 are in a closed state.

  In this state, the cooling water is caused to flow through the cooling water pipe 33 by the operation of the pump P1, the natural gas or the like is combusted by the gas burner 1A, and the heat transfer pipe provided in the exhaust heat regenerator 3 through the exhaust heat fluid supply pipe 30. While the exhaust heat fluid such as high-temperature and high-pressure steam and high-temperature water supplied from a co-generation system is supplied to 3B, the absorption liquid pump 11 is operated to spray the absorption liquid accumulated in the absorption liquid reservoir of the absorber 7 It sprays on the heat exchanger tube 3B from the vessel 3C.

  The high-temperature refrigerant vapor generated in the high-temperature regenerator 1 enters the low-temperature regenerator 2 through the refrigerant pipe 24, is concentrated in the high-temperature regenerator 1, and passes through the high-temperature heat exchanger 9 through the high-temperature regenerator 1. The absorption liquid that has entered the regenerator 2 is heated and condensed by heat dissipation, and then enters the condenser 4.

  Further, the refrigerant vapor separated from the absorption liquid by heating in the low temperature regenerator 2 enters the condenser 4, is heat-exchanged with the cooling water flowing in the cooling water pipe 33 to be condensed and liquefied, and is condensed and supplied from the refrigerant pipe 24. The refrigerant enters the evaporator 6 through the refrigerant pipe 26 together with the refrigerant.

  The high-temperature refrigerant vapor generated in the exhaust heat regenerator 3 also enters the exhaust heat condenser 5 and exchanges heat with the cooling water flowing in the cooling water pipe 33 to be condensed and liquefied. to go into.

  The refrigerant liquid that has entered the evaporator 6 and accumulated in the refrigerant liquid reservoir is sprayed by the refrigerant pump 10 on the heat transfer pipe 6A to which the cold / hot water pipe 32 is connected, and the heat transfer pipe 6A is passed through the cold / hot water pipe 32 by the operation of the pump P2. Heat is exchanged with water that is circulated and evaporated to cool the water flowing inside the heat transfer tube 6A.

  Then, the refrigerant evaporated by the evaporator 6 enters the absorber 7 and is heated by the low-temperature regenerator 2 to evaporate and separate the refrigerant. By the absorption liquid regenerated by increasing the concentration of the absorption liquid, that is, the absorption liquid pipe 21. It is supplied via the low-temperature heat exchanger 8 and is absorbed by the concentrated absorbent dispersed from above.

  Absorbing liquid whose concentration has been reduced by absorbing the refrigerant in the absorber 7, that is, the rare absorbing liquid, is transported to the exhaust heat regenerator 3 via the low-temperature heat exchanger 8 by the operation of the absorbing liquid pump 11, and spreader 3 </ b> C. The heat is then sprayed onto the heat transfer pipe 3B and heated by exchanging heat with the exhaust heat fluid supplied from the exhaust heat fluid supply pipe 30 as described above, and concentrated by evaporating and separating the refrigerant.

  When the operation is performed as described above, the cold water cooled by the heat of vaporization of the refrigerant in the heat transfer pipe 6A in the evaporator 6 can be circulated and supplied to a heat load (not shown) via the cold / hot water pipe 32. You can drive.

  In this case, the supply of the exhaust heat fluid from the exhaust heat fluid supply pipe 30 to the heat transfer pipe 3B has priority over the combustion of natural gas or the like in the gas burner 1A. That is, the control unit 36 calculates the load amount of the load supplied by the pump P2 from the temperature difference between the cold / hot water data set in the control unit 36 and the temperature of the cold / hot water measured by the temperature sensor 35, thereby controlling the flow rate. First, the flow control valve 13 calculates the opening degree of the valve 13 and controls the opening degree of the flow rate control valve 13 so that the temperature of the cold / hot water is lowered to a predetermined set temperature, for example, 7 ° C. The amount of heat input is controlled, and cold / hot heat supply operation from the cold / hot water pipe 32 to the load is performed.

  At this time, even if the flow control valve 13 is fully opened and the amount of exhaust heat fluid flowing through the heat transfer pipe 3B is maximized, if the supply amount of the cold / hot heat relative to the load amount is insufficient, that is, the temperature sensor 35 When the temperature of the cold / hot water to be measured does not decrease to the set temperature of 7 ° C., the flow rate control valve 13 remains fully open, and the high temperature regenerator 1 heats the absorbing liquid by ignition of the gas burner 1A so as to compensate for this shortage. The high temperature regenerator 1 also generates refrigerant vapor and concentrates and regenerates the absorption liquid so that the temperature of the cold / warm water cooled by the evaporator 6 and discharged to the cold / hot water pipe 32 becomes 7 ° C., which is the set temperature. Then, the amount of combustion by the gas burner 1A is controlled to supply cold / hot water at a predetermined temperature.

  As described above, the rare absorption liquid that has absorbed the refrigerant in the absorber 7 is sprayed into the exhaust heat regenerator 3 by the absorption liquid pump 11, and heat is recovered from the exhaust heat fluid flowing through the heat source heat transfer tube 3B. As the temperature and concentration rise, the absorption liquid pump 12 circulates the high-temperature heat exchanger 9 and sends it to the high-temperature regenerator 1. At this time, the rare absorbing liquid recovers heat from the exhaust heat fluid in the exhaust heat regenerator 3, and since the temperature and concentration are increased to some extent, even if the combustion amount of the combustion device 1A is reduced, Sufficient cold heat can be supplied to the load.

  If the temperature of the cold / hot water measured by the temperature sensor 35 does not rise to the set temperature of 7 ° C. even if the amount of heating by the gas burner 1A is minimized, the heating temperature by the exhaust heat fluid is sufficient. The heating by 1A is stopped, the flow rate control valve 13 is further controlled to reduce the supply amount of the exhaust heat fluid to the heat transfer pipe 3B, and the temperature of the cold / hot water cooled by the evaporator 6 and discharged to the cold / hot water pipe 32 is set temperature. It is controlled to be 7 ° C.

  In the state where the exhaust heat fluid is not supplied to the exhaust heat fluid supply pipe 30, the heating action by the heat transfer pipe 3B cannot be expected. Therefore, as described above, the absorption liquid is heated in the high temperature regenerator 1 by the combustion of the gas burner 1A. A cold water supply operation (cooling operation) can be performed by the promoting action.

  Next, the hot water supply operation (heating operation) will be described with reference to FIG. In this case, in the absorption chiller / heater 100 having the above-described configuration, the flow path switching valves 37A and 37B are switched in conjunction with the hot water supply operation (heating operation) to switch the hot water supply operation (heating operation). Based on this operation, the flow path switching valves 37A and 37B are switched from the exhaust heat regenerator 3 side to the heat transfer tube 6B side in the evaporator 6. That is, the exhaust heat fluid flowing in from the inlet of the exhaust heat fluid supply pipe 30 flows into the forward path 6B1 of the heat transfer pipe 6B, sequentially flows through the heat transfer pipe 6B and the return path 6B2, and returns from the return path 30B. In this state, the exhaust heat fluid does not flow to 3B. The on-off valves 14 to 17 are open.

  In this state, when natural gas or the like is burned by the gas burner 1A to heat and boil the absorption liquid in the high-temperature regenerator 1, the refrigerant vapor evaporated from the rare absorption liquid in the high-temperature regenerator 1 passes from the middle of the refrigerant pipe 24. The refrigerant flows into the absorber 7 through the refrigerant pipe 25 having a low flow resistance, and the absorbing liquid enters the absorber 7 from the absorbing liquid pipe 23 through the on-off valve 14. And this refrigerant | coolant vapor | steam passes through the eliminator between the evaporator 6 and the absorber 7, and enters the evaporator 6, and the heat exchanger tube 6A is mainly heated by this refrigerant | coolant vapor | steam. That is, when this refrigerant vapor touches the tube wall of the heat transfer tube 6A, the refrigerant vapor exchanges heat with the water supplied from the cold / hot water tube 32 via the heat transfer tube 6A to heat the water in the heat transfer tube 6A. And condensed at the bottom of the evaporator 6.

  On the other hand, since the exhaust heat fluid of the exhaust heat fluid supply pipe 30 flows to the heat transfer pipe 6B as described above, the liquid refrigerant accumulated at the bottom of the evaporator 6 exchanges heat with the tube wall of the heat transfer pipe 6B, and the heat transfer pipe 6B. Heat is recovered by heat recovery from the exhaust heat fluid inside, and thereby the temperature in the evaporator 6 rises, and the water supplied from the cold / hot water pipe 32 is heated through the pipe wall of the heat transfer pipe 6A. In addition, the liquid refrigerant accumulated at the bottom of the evaporator 6 is heated and evaporated by the heat transfer tube 6B, and exchanges heat with the upper heat transfer tube 6A to heat and condense the water in the heat transfer tube 6A, whereby the refrigerant tube 25 is added to the heating action by condensation of the refrigerant vapor entering the evaporator 6 from the absorber 7 through 25.

  In this way, the water flowing in the heat transfer tube 6A is heated by the heat of condensation of the refrigerant, and heated by the heat recovery from the exhaust heat fluid flowing in the heat transfer tube 6B to become hot water. By circulating and supplying to the load, heating operation such as heating can be performed.

  In this case, the control unit 36 calculates the load amount of the load supplied by the pump P2 from the temperature difference between the cold / hot water data set in the control unit 36 and the temperature of the cold / hot water measured by the temperature sensor 35, and the flow rate. The opening degree of the control valve 13 is calculated, the opening degree of the flow rate control valve 13 is controlled, and the flow rate control valve 13 is first controlled so that the temperature of the cold / hot water rises to a predetermined set temperature, for example, 55 ° C. Supply operation of cold / hot heat from the cold / hot water pipe 32 to the load is performed.

  At this time, even if the flow control valve 13 is fully opened and the amount of the exhaust heat fluid flowing to the heat transfer pipe 6B is maximized, if the supply amount of the cold / hot heat relative to the load amount is insufficient, that is, the temperature sensor 35 When the temperature of the cold / hot water to be measured does not rise to the set temperature of 55 ° C., the high-temperature regenerator is controlled by increasing the combustion amount of the gas burner 1A so as to compensate for this shortage while the flow rate control valve 13 remains fully open. 1 promote the heating of the absorbent. In this way, the amount of combustion by the gas burner 1A is controlled so that the temperature of the cold / warm water cooled by the evaporator 6 and discharged to the cold / hot water pipe 32 becomes the set temperature of 55 ° C., and the cold / warm water at a predetermined temperature is supplied. Do the driving.

  Further, even when the exhaust heat fluid flows to the heat transfer pipe 6B, even when the hot water supply (warm heat supply) to the load connected to the cold / hot water pipe 32 cannot be sufficiently performed only by recovering the heat from the exhaust heat fluid, the high temperature regenerator Therefore, the amount of combustion of the burner 1A heated by the high-temperature regenerator 1 can be reduced, and an economical operation that promotes energy saving can be performed.

  In this hot water supply operation (heating operation), the liquid refrigerant accumulated at the bottom of the evaporator 6 enters the absorber 7 from the refrigerant pipe 29 by the refrigerant pump 10, evaporates and separates the refrigerant in the high temperature regenerator 1, and absorbs the liquid pipe 23. Is mixed with the absorption liquid flowing into the absorber 7 and returned to the high-temperature regenerator 1 by the operation of the absorption liquid pumps 11 and 12.

  In the state where the exhaust heat fluid is not supplied to the exhaust heat fluid supply pipe 30, the heating action by the heat transfer pipe 6B cannot be expected. Therefore, as described above, the absorption liquid is heated in the high temperature regenerator 1 by the combustion of the gas burner 1A. The hot water supply operation (heating operation) can be performed by the promoting action.

  In addition, the refrigerant | coolant pipe | tube 29 in which the on-off valve 17 interposes may be provided between the upstream of the refrigerant | coolant pump 10, and the bottom part of the absorber 7, and the structure which does not drive the refrigerant | coolant pump 10 in warm water supply operation (heating operation) may be sufficient.

  As described above, the exhaust heat fluid flowing through the exhaust heat fluid supply pipe 30 is used to perform the cold water supply operation (cooling operation) and the hot water supply operation (heating operation) while reducing the fuel consumption in the gas burner 1A. Can do. In the state where the exhaust heat fluid is not supplied to the exhaust heat fluid supply pipe 30, cold water supply operation (cooling operation) and hot water supply operation (heating operation) are performed by the heating action of the absorbing liquid in the high-temperature regenerator 1 by the combustion of the gas burner 1 </ b> A. ) Can be performed.

  In the above description, the gas burner 1A is used as the absorbing liquid heating device in the high-temperature regenerator 1, but high-temperature steam exceeding 100 ° C. may be used as the heating device instead.

  The present invention can be variously changed in the piping and control mechanism of the absorption refrigeration machine, and is not limited to the above-described form, and can be applied to various forms without departing from the technical scope of the present invention.

It is a piping lineblock diagram of an absorption type cold / hot water machine concerning the present invention. It is a figure which shows the flow of the fluid in the cold water supply operation (cooling operation) of the absorption-type cold / hot water machine which concerns on this invention. It is a figure which shows the flow of the fluid in the hot water supply operation (heating operation) of the absorption type cold / hot water machine which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... High temperature regenerator 2 ... Low temperature regenerator 3 ... Waste heat regenerator 3A ... Absorption liquid discharge port 3B ... Heat transfer tube 3C for waste heat regenerator ... Spreader 4 ... Condenser 5 ... Exhaust heat condenser 6 ... Evaporator 6A ... Heat transfer tube 6B ... Evaporator heat transfer tube 7 ... Absorber 8 ... Low temperature Heat exchanger 9 ... High temperature heat exchanger 10 ... Refrigerant pump 11 ... Absorbing liquid pump 12 ... Absorbing liquid pump 13 ... Flow control valve (three-way valve)
14-17 ... On-off valve 18-23 ... Absorption liquid pipe 24-29 ... Refrigerant pipe 30 ... Waste heat fluid supply pipe 31 ... Bypass pipe 32 ... Cold / hot water pipe 33 ... Cooling water pipe 34 ... Pressure equalizing pipe 35 ... Temperature sensor 36 ... Control unit 37A ... Flow path switching valve 37B ... Flow path switching valve 100 ... Absorption chiller / heater

Claims (1)

Exhaust heat from other equipment such as a high temperature regenerator heated by a heating device such as a burner , a low temperature regenerator, a condenser, an evaporator, an absorber, and a cogeneration system. The waste heat regenerator that recovers heat by the heat transfer pipe for the exhaust heat regenerator through which the exhaust heat fluid supplied through the fluid supply pipe circulates, and the exhaust heat condenser that is arranged in parallel with the exhaust heat regenerator, the absorption liquid and the refrigerant It is connected by an absorption liquid pipe and a refrigerant pipe so as to circulate, and the rare absorption liquid in the absorber is conveyed by an absorption liquid pump and is exchanged for heat exchange with the heat transfer pipe for the exhaust heat regenerator. Absorption type cold / hot water having a cold / hot water pipe to which heated or cooled water is supplied via an installed heat transfer pipe, wherein the supply of the exhaust heat fluid to the heat transfer pipe for the exhaust heat regenerator has priority over the heating by the heating device In the machine
An evaporator heat transfer tube disposed in the refrigerant liquid stored in the evaporator and disposed so that the exhaust heat fluid flows;
A flow path switching valve for switching whether the exhaust heat fluid flows to the exhaust heat regenerator heat transfer pipe or to the evaporator heat transfer pipe ;
During the cold water supply operation in which cold water is supplied from the cold / hot water pipe, the exhaust heat fluid flows to the exhaust heat regenerator heat transfer pipe by the flow path switching valve, but does not flow to the evaporator heat transfer pipe,
During the hot water supply operation in which hot water is supplied from the cold / hot water pipe, the exhaust heat fluid flows to the evaporator heat transfer pipe but does not flow to the exhaust heat regenerator heat transfer pipe by the flow path switching valve. Absorption type hot and cold water machine characterized by.

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