JP2010266170A - Absorption-type refrigerating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorption type refrigerating machine capable of stabilizing a temperature of brine circulated and supplied to a heat load from an evaporator. <P>SOLUTION: In the absorption type refrigerating machine including a low heat source regenerator 9, a high-temperature regenerator 5, a low-temperature regenerator 6, the evaporator 1, a first condenser 7, a second condenser 10 and an absorber 2 forming a circulation passage of an absorbing liquid and a refrigerant by connecting them by piping, and capable of performing a single effect operation for heating the absorbing liquid while applying warm water supplied to the low heat source regenerator 9 as a heat source, and a single/double effect operation or a double effect operation for heating the absorbing liquid while using a gas burner 4 disposed in the high-temperature regenerator 5 as a heat source, an intermediate absorbing liquid reservoir 5C of the high-temperature regenerator 5 and a concentrated absorbing liquid pipe 25 from the low-temperature regenerator 6 to the absorber 2 are connected by an absorbing liquid supply pipe 27 with a supply opening/closing valve V2 interposed therebetween. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an absorption refrigerator having a low heat source regenerator using hot water or the like as a heat source.

In general, an absorption refrigeration machine having a low heat source regenerator, a high temperature regenerator, a low temperature regenerator, an evaporator, a condenser and an absorber, which are connected to each other to form a circulation path for an absorbing liquid and a refrigerant, is known. (For example, refer to Patent Document 1). In this type of absorption refrigerator, a single-effect operation in which the absorbing liquid is heated and regenerated using hot water supplied to the low heat source regenerator as a heat source, and a single double operation in which the absorbing liquid is heated and regenerated using a gas burner provided in the high-temperature regenerator as a heat source. It is configured to be able to operate by selecting a heavy effect operation and a double effect operation.
Japanese Patent Publication No. 03-8465

  By the way, for example, when shifting from a single-effect operation to a single-double-effect operation or a double-effect operation, a gas lag purge operation or the like is required in the gas heating operation, and therefore a time lag occurs from the start of operation to the ignition of the burner. For this reason, the absorption liquid immediately after the start of operation is not sufficiently regenerated by heating in the high temperature regenerator and the low temperature regenerator, and the absorption liquid discharged from the high temperature regenerator remains in the circulation path and has a low concentration. By mixing, the density | concentration of the absorption liquid supplied to an absorber falls. For this reason, there is a possibility that the amount of refrigerant evaporated in the evaporator fluctuates due to fluctuations in the amount of refrigerant absorbed by the absorber in the absorber, and the temperature of the brine that is circulated from the evaporator to the heat load may fluctuate. It was.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an absorption refrigerator that stabilizes the brine temperature that is circulated from an evaporator to a heat load.

  In order to solve the above-mentioned problems, the present invention comprises a low heat source regenerator, a high temperature regenerator, a low temperature regenerator, an evaporator, a condenser and an absorber, and these are connected by piping to provide a circulation path for the absorbing liquid and the refrigerant, respectively. A single effect operation in which the absorbing liquid is heated using hot water supplied to the low heat source regenerator as a heat source, and a single double effect operation or double effect in which the absorbing liquid is heated using the heating means provided in the high temperature regenerator as a heat source. In the absorption chiller configured to be operable, the intermediate absorption liquid reservoir of the high temperature regenerator, or the intermediate absorption liquid pipe extending from the intermediate absorption liquid reservoir to the low temperature regenerator and the absorption from the low temperature regenerator It is characterized in that it is connected to a concentrated absorption liquid pipe leading to a vessel by an absorption liquid supply pipe with an on-off valve interposed.

  According to this configuration, the on-off valve connects the intermediate absorption liquid reservoir of the high temperature regenerator or the intermediate absorption liquid pipe extending from the intermediate absorption liquid reservoir to the low temperature regenerator and the concentrated absorption liquid pipe extending from the low temperature regenerator to the absorber. Because it is connected by an intervening absorption liquid supply pipe, for example, when shifting from single-effect operation to single-double-effect operation or double-effect operation, the high-concentration absorption liquid in the high-temperature regenerator is opened by opening the on-off valve. Can be immediately supplied to the absorber through the absorption liquid supply pipe. For this reason, since the fall of the density | concentration of the absorption liquid supplied to an absorber is prevented and the fall of the evaporation amount accompanying this density fall can be suppressed, heat exchange with an evaporator is fully performed and the brine temperature is stabilized. be able to.

  In this configuration, the on-off valve may be opened when shifting from the single effect operation to the single double effect operation or the double effect operation.

  Further, the supply of the absorbing liquid from the low heat source regenerator to the high temperature regenerator may be stopped when shifting from the single double effect operation or the double effect operation to the single effect operation. According to this configuration, since it is possible to prevent the supply of the low concentration absorbent from the low heat source regenerator to the high temperature regenerator, the absorbent in the high temperature regenerator during the single effect operation is maintained at a concentration higher than a predetermined concentration. For example, when shifting from single-effect operation to single-double-effect operation or double-effect operation, the high-concentration absorbent in the high-temperature regenerator is immediately supplied to the absorber simply by opening the on-off valve. can do.

  Further, the gas burner may be ignited regularly or irregularly during the single-effect operation. According to this configuration, since the crystallization of the absorption liquid is prevented by suppressing the temperature drop of the absorption liquid in the high temperature regenerator, the absorption liquid in the high temperature regenerator during the single effect operation is more than a predetermined concentration. Can be maintained at a high concentration. For this reason, for example, when shifting from single-effect operation to single-double-effect operation or double-effect operation, the high-concentration absorbent in the high-temperature regenerator is immediately supplied to the absorber simply by opening the on-off valve. be able to.

  In addition, a liquid level detection sensor for detecting a liquid level height of the absorbing liquid in the intermediate absorption liquid reservoir is provided, and when the liquid level detected by the liquid level detection sensor is equal to or higher than a predetermined height, the opening and closing is performed. It is good also as a structure which opens a valve. According to this configuration, for example, the amount of overflow supplied when the on-off valve is opened can be easily calculated by predefining the liquid level height when stored in the high-temperature regenerator. In addition, it is possible to easily perform control when supplying the absorbing liquid from the high temperature regenerator to the absorber.

  According to the present invention, the on-off valve connects the intermediate absorption liquid reservoir of the high temperature regenerator or the intermediate absorption liquid pipe extending from the intermediate absorption liquid reservoir to the low temperature regenerator and the concentrated absorption liquid pipe extending from the low temperature regenerator to the absorber. Because it is connected by an intervening absorption liquid supply pipe, for example, when shifting from single-effect operation to single-double-effect operation or double-effect operation, the high-concentration absorption liquid in the high-temperature regenerator is opened by opening the on-off valve. Can be immediately supplied to the absorber through the absorption liquid supply pipe. For this reason, since the fall of the density | concentration of the absorption liquid supplied to an absorber is prevented and the fall of the evaporation amount accompanying this density fall can be suppressed, heat exchange with an evaporator is fully performed and the brine temperature is stabilized. be able to.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of an absorption chiller / heater (absorption refrigerator) 100 according to the present embodiment. The absorption chiller / heater 100 is a single double-effect absorption chiller / heater using water as a refrigerant and a lithium bromide (LiBr) aqueous solution as an absorbent.
As shown in FIG. 1, the absorption chiller / heater 100 includes an evaporator 1, an absorber 2 provided in parallel with the evaporator 1, and an evaporator absorber body that houses the evaporator 1 and the absorber 2. 3, a high-temperature regenerator 5 having a gas burner (heating means) 4, a low-temperature regenerator 6, a first condenser 7 arranged in parallel with the low-temperature regenerator 6, the low-temperature regenerator 6 and the first condensation A low-temperature regenerator condenser body 8 in which the regenerator 7 is housed, a low heat source regenerator 9 using hot water supplied from other equipment as a heat source, and a second condenser 10 arranged in parallel to the low heat source regenerator 9. A low heat source regenerator condenser body 11 containing the low heat source regenerator 9 and the second condenser 10, a low temperature heat exchanger 12, a high temperature heat exchanger 13, a rare absorbent pump P1, and an intermediate absorption. The liquid pump P2 and the refrigerant pump P3 are provided, and each of these devices includes the absorption liquid pipes 21 to 26 and the refrigerant pipes 31 to 31. Connected by piping via a 6.
Reference numeral 14 denotes a cold / hot water pipe for circulatingly supplying brine heat exchanged with the refrigerant in the evaporator 1 to a heat load (not shown) (for example, an air conditioner). A heat transfer tube 14 </ b> A formed in the section is arranged in the evaporator 1. Reference numeral 15 denotes a cooling water pipe for sequentially flowing cooling water through the absorber 2, the first condenser 7 and the second condenser 10, and each heat transfer pipe 15 </ b> A, 15 </ b> B formed in a part of the cooling water pipe 15. , 15C are arranged in the absorber 2, the first condenser 7 and the second condenser 10, respectively. Reference numeral 16 is for circulating and supplying relatively low temperature (eg, about 80 ° C.) hot water generated by a heat source generator (not shown) (eg, a solar water heater or a cogeneration device) to the low heat source regenerator 9. This is a low heat source supply pipe. The low heat source supply pipe 16 adjusts the flow rate of hot water supplied to the heat transfer pipe 16A, a heat transfer pipe 16A disposed in the low heat source regenerator 9, a bypass pipe 16B connected in parallel to the heat transfer pipe 16A, and the heat transfer pipe 16A. And a three-way valve 28 that can be switched for this purpose. Reference numeral 50 denotes a control device that controls the absorption chiller / heater 100 as a whole.

  The absorber 2 has a function of absorbing the refrigerant vapor evaporated in the evaporator 1 into the absorption liquid and maintaining the pressure in the evaporator absorber body 3 in a high vacuum state. Under the absorber 2, a rare absorption liquid reservoir 2A is formed in which the diluted absorption liquid diluted by absorbing the refrigerant vapor is accumulated. The rare absorption liquid reservoir 2A has a rare absorption liquid pump P1. One end of the liquid pipe 21 is connected, and the other end of the rare absorbent liquid pipe 21, that is, the downstream side of the rare absorbent liquid pump P1 is formed in the upper part in the low heat source regenerator 9 after passing through the low temperature heat exchanger 12. The gas layer 9A is opened.

In the lower part of the low heat source regenerator 9, there is formed an absorption liquid reservoir 9B in which the absorption liquid supplied through the rare absorption liquid pipe 21 is accumulated. The absorption liquid reservoir 9B is formed in a part of the low heat source supply pipe 16. A heat transfer tube 16A is arranged. By circulating hot water through the low heat source supply pipe 16, the absorption liquid can be heated and regenerated through the heat transfer pipe 16A, that is, the refrigerant in the absorption liquid can be evaporated to concentrate the absorption liquid.
One end of a first intermediate absorption liquid pipe 22 having an intermediate absorption liquid pump P2 is connected to the absorption liquid reservoir 9B, and the other end of the first intermediate absorption liquid pipe 22, that is, downstream of the intermediate absorption liquid pump P2. After passing through the high-temperature heat exchanger 13, the side opens to the gas layer part 5 </ b> B located above the heat exchange part 5 </ b> A formed in the high-temperature regenerator 5.

  The high-temperature regenerator 5 heats and regenerates the absorption liquid accumulated in the heat exchange unit 5A using the flame of the gas burner 4 as a heat source, and the heat exchange unit 5A is heated and regenerated on the side of the heat exchange unit 5A. An intermediate absorbing liquid reservoir 5C is formed in which the intermediate absorbing liquid flowing out from the heat exchange section 5A later accumulates. One end of a second intermediate absorption liquid pipe (intermediate absorption liquid pipe) 23 is connected to the lower end of the intermediate absorption liquid reservoir 5C, and the other end of the second intermediate absorption liquid pipe 23 is connected to the upper part in the low temperature regenerator 6. An opening is formed in the formed gas layer portion 6A. A high-temperature heat exchanger 13 is provided on the second intermediate absorption liquid pipe 23 on the intermediate absorption liquid reservoir 5C side. The high-temperature heat exchanger 13 heats the absorption liquid flowing through the first intermediate absorption liquid pipe 22 with the heat of the high-temperature intermediate absorption liquid flowing out from the intermediate absorption liquid reservoir 5C, and the gas burner 4 in the high-temperature regenerator 5 is heated. It aims to reduce fuel consumption. Further, the upstream side of the second intermediate absorption liquid pipe 23 at the high temperature heat exchanger 13 and the absorber 2 are connected by an absorption liquid pipe 24 with an on-off valve V1 interposed therebetween.

The low-temperature regenerator 6 uses the refrigerant vapor separated by the high-temperature regenerator 5 as a heat source to heat and regenerate the absorption liquid stored in the absorption liquid reservoir 6B formed below the gas layer portion 6A. In 6B, a heat transfer tube 31A formed in a part of the refrigerant tube 31 extending from the upper end of the high temperature regenerator 5 to the bottom of the first condenser 7 is arranged. By circulating the refrigerant vapor through the refrigerant pipe 31, the heat of the refrigerant vapor is transmitted to the absorption liquid stored in the absorption liquid reservoir 6B via the heat transfer pipe 31A, and the absorption liquid is further concentrated.
One end of a concentrated absorption liquid pipe 25 is connected to the lower end of the absorption liquid reservoir 6B of the low-temperature regenerator 6, and the other end of the concentrated absorption liquid pipe 25 is provided at the upper part of the gas layer portion 2B of the absorber 2. It is connected to the liquid spreader 2C. The concentrated absorption liquid pipe 25 is provided with a low-temperature heat exchanger 12. The low-temperature heat exchanger 12 heats the rare absorbent flowing through the rare absorbent pipe 21 with the warm heat of the concentrated absorbent flowing out from the absorbent reservoir 6B of the low-temperature regenerator 6. The upstream side of the low-temperature heat exchanger 12 of the concentrated absorbent pipe 25 and the upstream side of the intermediate absorbent pump P2 of the first intermediate absorbent pipe 22 are connected by a bypass pipe 26, and this intermediate absorbent pump P2 When the operation is stopped, the absorption liquid flowing out from the absorption liquid reservoir 9B of the low heat source regenerator 9 is the first intermediate absorption liquid pipe 22, the bypass pipe 26, the low temperature heat exchanger 12, and the concentrated absorption liquid pipe. 25 and supplied into the absorber 2.

In the present embodiment, the intermediate absorption liquid reservoir 5C of the high-temperature regenerator 5 is provided with a liquid level sensor (liquid level detection sensor) 51 for detecting the liquid level of the absorption liquid accumulated in the intermediate absorption liquid reservoir 5C. . Further, one end of the absorbing liquid supply pipe 27 is connected to the side surface part 52 of the intermediate absorbing liquid reservoir 5C which is at substantially the same height as the lower end part of the liquid level sensor 51, and the other end of the absorbing liquid supply pipe 27 is connected. Is connected to a connecting portion 25A between the low-temperature heat exchanger 12 of the concentrated absorbent liquid pipe 25 and the concentrated liquid spreader 2C via a supply open / close valve (open / close valve) V2. When the supply on-off valve V2 is ignited by the gas burner 4 under the control of the control device 50, the liquid level of the absorbing liquid in the intermediate absorbing liquid reservoir 5C rises to become a predetermined height or more. That is, it is controlled so that it opens when the liquid level sensor 51 is in contact with the absorbing liquid and closes when the liquid level of the absorbing liquid is lowered and the liquid level sensor 51 is separated from the absorbing liquid.
The absorbing liquid supply pipe 27 includes a first horizontal part 27A connected to the intermediate absorbing liquid reservoir 5C, a second horizontal part 27B connected to the concentrated absorbing liquid pipe 25, the first horizontal part 27A and the second horizontal part 27A. U seal part 27C which is provided between horizontal parts 27B and curves below. The second horizontal portion 27B is provided at a position lower by a height H than the first horizontal portion 27A, that is, the lower end position of the liquid level sensor 51. Due to the head difference corresponding to the height H, the intermediate absorbing liquid reservoir 5C is provided. From this, the absorbent is supplied to the concentrated absorbent pipe 25.
Further, since the absorbent supply pipe 27 is connected to the concentrated absorbent liquid pipe 25 on the downstream side of the low-temperature heat exchanger 12, the absorbent supply pipe 27 circulates from the high-temperature regenerator 5 through the absorbent supply pipe 27 and is absorbed into the absorber 2. It is possible to reduce the pressure loss of the piping path for supplying the liquid, and to reduce the head difference between the first horizontal portion 27A and the second horizontal portion 27B.
The U seal portion 27 </ b> C is installed at a lower position than the evaporator absorber cylinder 3 and the high temperature regenerator 5, and between the pressure in the evaporator absorber cylinder 3 and the pressure in the high temperature regenerator 5. Even when a difference occurs, the gap between the evaporator absorber body 3 and the high temperature regenerator 5 can be sealed.

As described above, the gas layer 5B of the high-temperature regenerator 5 and the bottom of the first condenser 7 are connected by the refrigerant pipe 31 that passes through the heat transfer pipe 31A piped to the absorption liquid reservoir 6B of the low-temperature regenerator 6. The upstream side of the heat transfer pipe 31A of the refrigerant pipe 31 and the gas layer portion 2B of the absorber 2 are connected by a refrigerant pipe 32 having an on-off valve V3 interposed therebetween.
Further, the bottom portion of the first condenser 7 and the gas layer portion 1A of the evaporator 1 are connected by a refrigerant pipe 33 in which a U seal portion 33A is interposed, and the U seal portion 33A of the refrigerant pipe 33 and the second condenser 10 are connected. The bottom side is connected by a refrigerant pipe 34. A refrigerant liquid reservoir 1B in which liquefied refrigerant accumulates is formed below the evaporator 1, and the refrigerant liquid reservoir 1B and the spreader 1C disposed above the gas layer portion 1A of the evaporator 1 are refrigerant pumps P3. Are connected by a refrigerant pipe 35. The refrigerant pipe 35 is connected to the downstream side of the refrigerant pump P3 and the absorbing liquid reservoir 2A of the absorber 2 through a refrigerant pipe 36 with an on-off valve V4 interposed therebetween. Further, the outlet side of the heat transfer pipe 14A of the cold / hot water pipe 14 and the outlet side of the heat transfer pipe 15B of the cooling water pipe 15 are connected by a communication pipe 37 with an on-off valve V5 interposed therebetween.

Next, the operation will be described.
During cooling operation such as cooling, the temperature at the outlet side of the evaporator 1 of brine (for example, cold water) circulated and supplied to a heat load (not shown) via the cold / hot water pipe 14 is set to a predetermined set temperature, for example, 7 ° C. The amount of heat input to the absorption chiller / heater 100 is controlled by the controller 50.
Specifically, for example, the control device 50 has a large heat load, and the temperature of hot water supplied to the low heat source regenerator 9 via the low heat source supply pipe 16 reaches a predetermined temperature (for example, 85 ° C.). Sometimes, a rated amount of hot water is supplied from the low heat source supply pipe 16 to the low heat source regenerator 9, all pumps P1 to P3 are started, and a single double effect operation is performed in which gas is burned in the gas burner 4. The heating power of the gas burner 4 is controlled so that the brine temperature measured by the sensor S1 is a predetermined 7 ° C.

  In this case, the rare absorption liquid conveyed from the absorber 2 to the low heat source regenerator 9 by the rare absorption liquid pump P1 through the rare absorption liquid pipe 21 is low in the absorption liquid reservoir 9B in the low heat source regenerator 9. When the hot water supplied from the heat source supply pipe 16 is heated through the pipe wall of the heat transfer pipe 16A, the refrigerant in the rare absorbent is evaporated and separated.

The intermediate absorption liquid whose absorption liquid concentration has been increased by evaporating and separating the refrigerant is heated by the intermediate absorption liquid pump P2 of the first intermediate absorption liquid pipe 22 via the high temperature heat exchanger 13 and sent to the high temperature regenerator 5. . Since the intermediate absorption liquid conveyed to the high temperature regenerator 5 is heated by the flame by the gas burner 4 and the high temperature combustion gas in the high temperature regenerator 5, the refrigerant in the intermediate absorption liquid evaporates and separates. The intermediate absorbing liquid whose concentration has been increased by evaporating and separating the refrigerant in the high temperature regenerator 5 is sent to the low temperature regenerator 6 via the high temperature heat exchanger 13.
Then, the intermediate absorption liquid is heated by the high-temperature refrigerant vapor supplied from the high-temperature regenerator 5 through the refrigerant pipe 31 and flowing into the heat transfer pipe 31A in the low-temperature regenerator 6, and the refrigerant is further separated to further increase the concentration. Thus, this concentrated absorbent is sent to the absorber 2 via the low-temperature heat exchanger 12, and is sprayed from above the concentrated sprayer 2C.

On the other hand, the refrigerant separated and generated by the low heat source regenerator 9 enters the second condenser 10 and condenses, and the refrigerant separated and generated by the low temperature regenerator 6 enters the first condenser 7 and condenses. The refrigerant liquid generated by the first condenser 7 enters the evaporator 1 through the refrigerant pipe 33, and the refrigerant liquid condensed and generated by the second condenser 10 enters the evaporator 1 via the refrigerant pipe 34, and the refrigerant pump P3 is operated. The liquid is pumped and sprayed from the spreader 1 </ b> C onto the heat transfer tube 14 </ b> A of the cold / hot water tube 14.
The refrigerant liquid sprayed on the heat transfer tube 14A evaporates by removing vaporization heat from the brine passing through the inside of the heat transfer tube 14A, so that the brine passing through the inside of the heat transfer tube 14A is cooled, and the brine thus lowered in temperature is A cooling operation such as cooling is performed by supplying the heat load from the cold / hot water pipe 14.
Then, the refrigerant evaporated in the evaporator 1 enters the absorber 2, is absorbed by the concentrated absorbent supplied from the low temperature regenerator 6 and sprayed from above, and accumulates in the rare absorbent reservoir 2A of the absorber 2, The circulation conveyed to the low heat source regenerator 9 by the absorption liquid pump P1 is repeated.

  During the single double effect operation, the amount of heating by the gas burner 4, specifically the amount of gas supplied to the gas burner 4, is controlled by the control device 50 so that the temperature measured by the temperature sensor S 1 becomes a predetermined 7 ° C. The And even if the amount of heating by the gas burner 4 is minimized, when the temperature sensor S1 measures a temperature lower than the predetermined 7 ° C., the control device 50 stops the combustion of the gas and stops the heating by the gas burner 4 to perform the single effect operation. Migrate to In this case, the control device 50 determines that the intermediate absorbing liquid until the liquid level of the absorbing liquid stored in the intermediate absorbing liquid reservoir 5C of the high temperature regenerator 5 reaches a predetermined position higher than the lower end of the liquid level sensor 51. When the pump P2 is operated and reaches the predetermined position, the operation of the intermediate absorbent pump P2 is stopped.

The absorption liquid in the single effect operation is heated in the low heat source regenerator 9 by hot water supplied from the low heat source supply pipe 16 to evaporate and separate the refrigerant. Then, the absorption liquid whose absorption liquid concentration has increased is returned to the absorber 2 via the bypass pipe 26 and the low-temperature heat exchanger 12.
On the other hand, the refrigerant vapor separated and generated by the low heat source regenerator 9 enters the second condenser 10 and condenses, and flows into the evaporator 1 through the refrigerant pipe 34. The refrigerant liquid flowing into the evaporator 1 is sprayed from the sprayer 1C onto the heat transfer pipe 14A of the cold / hot water pipe 14 by the operation of the refrigerant pump P3, and evaporates by taking heat from the brine passing through the heat transfer pipe 14A. Then, circulation is performed which is absorbed into the absorbing liquid sprayed from above by entering the absorber 2. Note that the heat generated when the absorbing liquid absorbs the refrigerant is cooled by the heat transfer pipe 15 </ b> A of the cooling water pipe 15 disposed in the absorber 2.

  Here, the control device 50 measures the temperature of the absorbent stored in the intermediate absorbent reservoir 5C of the high-temperature regenerator 5 during the single effect operation, and when this temperature falls below a predetermined temperature, Control is performed so that the gas burner 4 is ignited and the temperature of the absorbing liquid is maintained at a predetermined temperature or higher. In addition, you may ignite the gas burner 4 regularly irrespective of the temperature of absorption liquid.

During the single effect operation, the amount of heat in the low heat source regenerator 9, specifically, hot water taken into the heat transfer tube 16A from the low heat source supply pipe 16 so that the temperature measured by the temperature sensor S1 is a predetermined 7 ° C. The amount, that is, the opening degree of the three-way valve 28 is controlled by the control device 50.
And even if the three-way valve 28 is operated so that the entire amount of hot water flowing through the low heat source supply pipe 16 flows into the heat transfer pipe 16A, when the temperature sensor S1 does not measure a temperature of 7 ° C. or less, the temperature is as described above. The gas is burned by the gas burner 4, the heating regeneration of the absorbing liquid and the generation of the refrigerant vapor in the high temperature regenerator 5 are resumed, and the single double effect operation is resumed.

Further, during the single effect operation, although the heat load is large, the temperature of the hot water supplied to the low heat source regenerator 9 through the low heat source supply pipe 16 is lowered to a predetermined 85 ° C. or less (for example, due to bad weather etc.) When the temperature of the hot water supplied from the solar water heater is not stable), the three-way valve 28 is switched so that the hot water is not supplied from the low heat source supply pipe 16 to the low heat source regenerator 9, and all the pumps P1 to P3 are activated. In addition, a double-effect operation in which gas is burned in the gas burner 4 is performed. Also in this case, the heating power of the gas burner 4 is controlled by the control device 50 so that the temperature of the brine measured by the temperature sensor S1 becomes a predetermined temperature of 7 ° C.
In this double effect operation, the rare absorbent in the rare absorbent reservoir 2A of the absorber 2 is conveyed to the low heat source regenerator 9 by the rare absorbent pump P1 and stored in the absorbent reservoir 9B. Is not supplied with hot water as a heat source. For this reason, the rare absorption liquid conveyed to the low heat source regenerator 9 is conveyed to the high temperature regenerator 5 via the high temperature heat exchanger 13 by the operation of the intermediate absorption liquid pump P2 without being heated, and thereafter the single absorption liquid is single-layered. In the same manner as in the double effect operation, the refrigerant is heated while being circulated, and the high temperature regenerator 5 and the low temperature regenerator 6 concentrate and regenerate the absorption liquid and separate and produce the refrigerant. During this double effect operation, when the temperature of the hot water supplied to the low heat source regenerator 9 reaches a predetermined 85 ° C., a single double effect operation or a single effect operation is performed according to the size of the cooling load.

In this configuration, when shifting from the single-effect operation to the double-effect operation or the single-double-effect operation, the control device 50 opens the supply opening / closing valve V2 provided in the absorption liquid supply pipe 27. Thereby, since the high concentration absorption liquid in the intermediate absorption liquid reservoir 5C of the high temperature regenerator 5 can be immediately supplied to the absorber 2 through the absorption liquid supply pipe 27, the absorption liquid supplied to the absorber 2 can be reduced. Since the decrease in the concentration is prevented and the decrease in the evaporation amount due to the decrease in the concentration can be suppressed, the heat exchange in the evaporator 1 is sufficiently performed and the brine temperature can be stabilized.
Furthermore, since the supply on-off valve V2 is controlled to be opened when the liquid level detected by the liquid level sensor 51 is equal to or higher than a predetermined level, the supply on-off valve V2 is stored in the intermediate absorption liquid reservoir 5C of the high-temperature regenerator 5. If the liquid level height is determined in advance, the supply amount (overflow amount) when the supply on-off valve V2 is opened can be easily calculated. Therefore, absorption from the intermediate absorption liquid reservoir 5C of the high-temperature regenerator 5 is possible. Control when supplying the absorbing liquid to the vessel 2 can be easily performed.

  Further, when the transition from the double effect operation or the single double effect operation to the single effect operation is performed, the supply of the absorbing liquid from the low heat source regenerator 9 to the high temperature regenerator 5 is stopped. Supply of the low concentration absorbent to the regenerator 5 can be prevented. For this reason, the absorption liquid in the high temperature regenerator 5 during the hot water single operation can be maintained at a concentration higher than a predetermined concentration. For example, when shifting from the single effect operation to the double effect operation, the supply opening / closing valve V2 The high concentration absorbent in the intermediate absorbent reservoir 5C of the high temperature regenerator 5 can be immediately supplied to the absorber 2 simply by opening the.

  In addition, when the temperature of the absorbent stored in the intermediate absorbent reservoir 5C of the high-temperature regenerator 5 falls below a predetermined temperature during the single-effect operation, the control device 50 ignites the gas burner 4, so By suppressing the temperature drop of the absorbent in the regenerator 5, crystallization of the absorbent is prevented. For this reason, the absorption liquid in the high temperature regenerator 5 during the single effect operation can be maintained at a concentration higher than a predetermined concentration. Therefore, for example, when shifting from the single effect operation to the double effect operation, the high concentration absorbent in the intermediate absorbent reservoir 5C of the high temperature regenerator 5 can be immediately absorbed by simply opening the supply on-off valve V2. 2 can be supplied.

The above-described embodiment shows one aspect to which the present invention is applied, and the present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, one end of the absorption liquid supply pipe 27 is connected to the side surface portion 52 of the intermediate absorption liquid reservoir 5C, and the other end of the absorption liquid supply pipe 27 is connected to the concentrated absorption liquid pipe via the supply opening / closing valve V2. Although it was set as the structure connected to the connection part 25A between 25 low-temperature heat exchangers 12 and the concentrated liquid spreader 2C, it is not restricted to this, As shown in FIG. One end may be connected to a connection portion 23 </ b> A provided between the intermediate absorbent reservoir 5 </ b> C and the high-temperature heat exchanger 13 in the second intermediate absorbent pipe 23.
In this configuration, the first horizontal portion 27A of the absorption liquid supply pipe 27 is positioned below the second horizontal portion 27B, but the liquid level height (liquid level sensor 51) of the absorption liquid accumulated in the intermediate absorption liquid reservoir 5C. The lower end position) is provided by a height H higher than the second horizontal portion 27B, so that the absorbing liquid is supplied from the intermediate absorbing liquid reservoir 5C to the concentrated absorbing liquid pipe 25 by the head difference corresponding to the height H. The

Further, as shown in FIG. 3, the other end of the absorbing liquid supply pipe 27 is connected between the low temperature regenerator 6 and the low temperature heat exchanger 12 in the concentrated absorbing liquid pipe 25 via a supply opening / closing valve V2. You may connect to the part 25B. According to this configuration, the high-temperature absorption liquid flowing through the absorption liquid supply pipe 27 and the absorption liquid flowing out from the low-temperature regenerator 6 can be mixed on the upstream side of the low-temperature heat exchanger 12. In the exchanger 12, a large amount of heat can be given to the absorbent flowing through the rare absorbent pipe 21. Further, as shown in FIG. 4, one end of the absorption liquid supply pipe 27 is connected to the connecting portion 23A of the second intermediate absorption liquid pipe 23, and the other end of the absorption liquid supply pipe 27 is connected via the supply opening / closing valve V2. You may connect to the said connection part 25B of the thick absorption liquid pipe | tube 25. FIG.
Further, in the above-described embodiment, the configuration including the gas burner 4 that performs heating by burning the fuel gas as the heating unit that heats the absorbing liquid in the high-temperature regenerator 5 has been described. It is good also as a structure provided with the burner which burns A heavy oil, or the structure heated using warm heat, such as a vapor | steam and exhaust gas.

It is a schematic block diagram of the absorption-type cold / hot water machine concerning this embodiment. It is a schematic block diagram which shows the modification of an absorption cold / hot water machine. It is a schematic block diagram which shows another modification of an absorption cold / hot water machine. It is a schematic block diagram which shows another modification of an absorption cold / hot water machine.

DESCRIPTION OF SYMBOLS 1 Evaporator 2 Absorber 4 Gas burner (heating means)
DESCRIPTION OF SYMBOLS 5 High temperature regenerator 5C Intermediate absorption liquid pool 6 Low temperature regenerator 7 1st condenser 9 Low heat source regenerator 10 2nd condenser 11 Low heat source regenerator condenser body 12 Low temperature heat exchanger 13 High temperature heat exchanger 14 Cold / hot water Pipe 15 Cooling water pipe 16 Low heat source supply pipe 23 Second intermediate absorption liquid pipe (intermediate absorption liquid pipe)
25 Concentrated Absorbing Liquid Pipe 27 Absorbing Liquid Supply Pipe 27A First Horizontal Part 27B Second Horizontal Part 27C U Seal Part 50 Controller 51 Liquid Level Sensor (Liquid Level Detection Sensor)
52 Side 100 Absorption chiller / heater (absorption refrigerator)
P2 Intermediate absorption pump V2 Supply on / off valve (open / close valve)

Claims (5)

A low heat source regenerator, a high temperature regenerator, a low temperature regenerator, an evaporator, a condenser, and an absorber are provided, and these are connected by piping to form a circulation path for absorbing liquid and refrigerant, respectively, and supplied to the low heat source regenerator Absorption refrigeration configured to enable a single effect operation in which the absorption liquid is heated using hot water as a heat source and a single double effect operation or a double effect operation in which the absorption liquid is heated using a heating means provided in the high-temperature regenerator as a heat source. In the machine
An on-off valve is interposed between the intermediate absorption liquid reservoir of the high temperature regenerator, or an intermediate absorption liquid pipe extending from the intermediate absorption liquid reservoir to the low temperature regenerator and a concentrated absorption liquid pipe extending from the low temperature regenerator to the absorber. An absorption refrigerator which is connected by an absorption liquid supply pipe.   2. The absorption refrigerator according to claim 1, wherein the on-off valve is opened when shifting from the single effect operation to the single double effect operation or the double effect operation.   The supply of the absorbing liquid from the low heat source regenerator to the high temperature regenerator is stopped when shifting from the single double effect operation or the double effect operation to the single effect operation. Or the absorption refrigerator according to 2.   The absorption refrigerator according to any one of claims 1 to 3, wherein the gas burner is ignited regularly or irregularly during the operation of the single-effect operation.   A liquid level detection sensor for detecting a liquid level height of the absorbing liquid in the intermediate absorbing liquid reservoir, and when the liquid level detected by the liquid level detection sensor is equal to or higher than a predetermined height, The absorption refrigerator according to any one of claims 1 to 4, wherein the absorption refrigerator is opened.

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