JP4909245B2 - Absorption system operation method and absorption system - Google Patents

Description

  The present invention relates to an absorption system including an embedded heat exchanger that includes an evaporator, an absorber, a regenerator, and a condenser, is driven by heat generated from a heat source device, and can exchange heat with geothermal heat.

As such an absorption system, a system using a prime mover (for example, an engine for power generation) as a driving source is well known.
When the absorption system draws heat from the ground and uses the heat for heating or the like, the absorption system is a first-class absorption heat pump. By using the absorption system as a first-class absorption heat pump, the ground temperature is higher than the outside air temperature, water temperature, etc. in the winter, pumping underground heat, generating hot water by heat exchange, heating and hot water supply Etc. can be used.
When operating the absorption system as a first-class absorption heat pump, it is necessary to exchange heat between the refrigerant in the evaporator and the ground, so heat is transferred between the buried heat exchanger and the refrigerant in the evaporator. A circulation path is provided.

  On the other hand, by making the absorption system work as an absorption refrigerator, the absorption system draws cold from the ground and generates cold air by heat exchange by using the fact that the ground temperature is lower than room temperature in summer. Can be used for. When operating the absorption system as an absorption chiller, it is necessary to exchange heat between the absorber and the coolant flowing through the condenser, so the embedded heat exchanger, the absorber, the condenser, and the heat for heat release A circulation path is set up so that heat can be transferred between the exchanger and the coolant.

As described above, the above absorption system is driven by the heat generated from the heat source device in the winter and summer using the temperature difference between the ground temperature and the heat utilization target, and the COP High and good heat utilization can be achieved.
Here, the underground usage form is basically based on the premise that the heat capacity is infinite and kept constant. Therefore, in the prior art, the buried part of the buried heat exchanger is also deeper than a certain depth where the temperature is kept almost constant, or there is a flow of groundwater or the like nearby, and the temperature is stable. It is a part that is doing.

JP 2002-256970 A

  In an absorption system in which an absorption heat pump or absorption refrigerator as described above and an embedded heat exchanger are combined, for example, exhaust heat of a power generation internal combustion engine (engine) is used as energy (heat) for driving the absorption system. The As described above, when the absorption system is used as a first-class absorption heat pump in the winter and the absorption system is used as an absorption chiller in the summer, it is exhausted by generating electricity in the spring and fall, which are the intermediate periods. Even if heat was generated, the exhaust heat could not be used and was discarded. Therefore, it cannot be said that this utilization form fully utilizes valuable energy resources, and there is room for improvement.

  On the other hand, in the above-described absorption system, the underground is used as a thermostatic bath that is warm in winter and cold in summer. There is a need to search for underground parts that are in circulation and maintain a constant temperature state, and it has not been a system that is sufficiently versatile and easy to accept as a ground heat utilization technique.

  The present invention has been made in view of the above-described problems, and its purpose is to absorb heat generated from a heat source effectively not only in winter and summer, but also in spring and autumn, which are intermediate periods. It is to obtain a method of operating the system and to obtain such an absorption system.

To achieve the above purpose,
An evaporator, an absorber, a regenerator, and a condenser, driven by heat generated from a heat source unit, and an embedded heat exchanger that exchanges heat between the refrigerant in the evaporator and the ground,
The first characteristic configuration of the operation method of the absorption system configured to pump up the underground heat through the buried heat exchanger and output the heat through the coolant flowing through the absorber and the condenser is:
Performing a thermal underground heat storage step of storing the heat generated from the heat source device in the ground via the buried heat exchanger;
The heat stored in the ground in the heat underground heat storage step is pumped up through the buried heat exchanger, the heat is extracted through the coolant, and the underground heat utilization step of using is performed.

In the operation method of this absorption system, in the thermal underground heat storage step, the heat generated from the heat source device is stored in the ground via the buried heat exchanger, and the heat stored in the ground in the thermal underground heat storage step is stored. In the underground heat utilization step, the heat is pumped through the buried heat exchanger, and the heat is taken out and used through the coolant.
Therefore, effective heat utilization can be achieved by storing heat (warm heat) generated from the heat source device in the ground and using the stored warm heat from the ground.

  As explained earlier, in the conventional absorption system, the underground usage is used as a thermostatic bath that uses the relatively low temperature in the summer and the relatively high temperature in the winter. Although it was a form, in the operation method of the absorption system which concerns on this application, underground is utilized as a kind of heat storage tank. Therefore, it is not necessary to dispose a buried heat exchanger in a deep part as in the prior art, or to find a part through which groundwater flows, thereby increasing versatility. In addition, in the situation where the heat generated by the heat source machine is not used, heat is stored in the form of heat in the ground, and in the situation where heat is desired to be used, the heat is taken out from the ground and used, so sufficient precious energy resources are available. Can be used for

As such an operation mode, it is preferable to execute the thermal underground heat storage step in the autumn and the underground thermal utilization step in the winter.
In this case, heat is stored in the ground in the autumn and the stored heat is used in the winter, but the heat generated from the heat source machine can be used in both the autumn and winter.

Absorption systems that can use this type of operation are:
An evaporator, an absorber, a regenerator, and a condenser, driven by heat generated from a heat source unit, and an embedded heat exchanger that exchanges heat between the refrigerant in the evaporator and the ground,
Thermal underground heat storage operation for storing the heat generated from the heat source unit in the ground via the buried heat exchanger,
A system configured to be able to execute an underground heat utilization operation that pumps up the underground heat through the buried heat exchanger and outputs the heat through the coolant flowing through the absorber and the condenser.

This absorption system includes an embedded heat exchanger that exchanges heat between the refrigerant in the evaporator and the ground, pumps the underground heat through the embedded heat exchanger, and flows through the absorber and the condenser. By being able to execute the underground heat utilization operation that outputs the heat via the coolant, it can function as a first-type absorption heat pump and perform the underground heat utilization step.
On the other hand, the thermal underground heat storage step demonstrated previously can be performed by making it possible to perform the thermal underground thermal storage operation which accumulates the thermal energy which generate | occur | produces from a heat source machine in the ground via the said embedded heat exchanger.
As a result, as described above, the method proposed by the present application that stores heat in the ground in the fall and uses it in the winter can be executed.

To achieve the above purpose,
An embedded heat exchanger that includes an evaporator, an absorber, a regenerator, and a condenser, is driven by heat generated from a heat source device, and exchanges heat between the coolant flowing through the absorber and the condenser and the ground. Equipped with
The second characteristic configuration of the operation method of the absorption system configured to pump up the cold in the ground through the buried heat exchanger and output the cold by the evaporator is as follows:
Using the heat generated from the heat source unit, performing a cold underground heat storage step of storing cold heat generated from the evaporator in the ground through the buried heat exchanger,
The cold heat stored in the ground in the cold underground heat storage step is pumped into the coolant via the buried heat exchanger, and the underground cold utilization step is used to generate cold by the evaporator It is in.

In the operation method of this absorption system, in the cold ground heat storage step, the heat generated from the heat source machine is used (used for driving), cold is generated by the evaporator, and the generated cold is buried in the embedded heat exchanger Through the underground heat storage step, pumping the cold heat stored in the ground through the underground heat storage step through the buried heat exchanger, the evaporator, the absorber, the regenerator and It is used in a cycle consisting of a condenser and is used to generate cold heat in an evaporator.
Therefore, the heat generated from the heat source machine (heat) is converted into cold form and stored in the ground, and the stored cold is pumped from the ground and used for generating cold. Can be planned.

  As previously indicated, in the conventional absorption system, the underground use form is as a thermostatic bath that utilizes the relatively low temperature in the summer and the relatively high temperature in the winter. Although it was a use form, in the operation method of the absorption system concerning this application, underground is used as a kind of heat storage tank. Therefore, it is not necessary to dispose a buried heat exchanger in a deep part as in the prior art, or to find a part through which groundwater flows, thereby increasing versatility. Furthermore, in the situation where the heat generated by the heat source machine is not used, heat is stored in the ground in the form of cold heat, and in the situation where cold heat is desired to be used, the cold energy is taken out from the ground and used. Can be used for

As such an operation mode, it is preferable that the cold underground heat storage step is executed in the spring and the underground cold utilization step is executed in the summer.
In this case, the cold is stored in the ground in the spring, and the stored cold is used in the summer, but the heat generated from the heat source device is converted into cold and in both the spring and summer. Available.

  It is preferable that the coolant temperature at the time of performing the underground cold energy use step in summer is higher than the coolant temperature at the time of executing the cold underground heat storage step in spring. The COP of the system in summer can be kept high, and at the same time, the amount of cold heat storage in spring can be increased.

Absorption systems that can use this type of operation are:
An embedded heat exchanger that includes an evaporator, an absorber, a regenerator, and a condenser, is driven by heat generated from a heat source device, and exchanges heat between the coolant flowing through the absorber and the condenser and the ground. Equipped with
Using the heat generated from the heat source machine, cold storage heat storage operation to store the cold generated from the evaporator in the ground through the buried heat exchanger,
Via the embedded heat exchanger, it is configured to be able to execute underground cold utilization operation capable of pumping the cold in the ground to the coolant flowing through the absorber and the condenser and outputting the cold by the evaporator. Can be with the system.

The absorption system includes an embedded heat exchanger that exchanges heat between the absorber and the coolant flowing through the condenser and the ground, and uses the cold in the ground through the embedded heat exchanger, By being able to execute the underground cold utilization operation that outputs cold, it can function as an absorption refrigerator and can execute the underground cold utilization step.
On the other hand, by using the heat generated from the heat source machine, it is possible to perform the cold underground heat storage operation in which the cold heat generated in the evaporator is stored in the ground via the buried heat exchanger, and the cold heat described above Underground heat storage step can be executed.
As a result, as described above, it is possible to execute the method proposed by the present application in which cold is stored in the ground in the spring and used in the summer. In addition, the amount of cold obtained in the spring can be increased.

Furthermore, in the absorption system described so far,
A high heat storage side heat exchange part provided in the underground part having a high heat storage capacity, and a constant temperature side heat exchange part that has a lower heat storage capacity than the high heat storage side heat exchange part and is kept in a constant temperature state,
It is preferable that the high heat storage side heat exchange unit and the constant temperature side heat exchange unit are selectively configured to be used as the embedded heat exchanger.
As described above, the underground utilization form in the present application is to utilize the underground as a heat storage tank for hot or cold heat. Therefore, in such a utilization form, the arrangement | positioning site | part of an embedded heat exchanger needs to be a site | part which can store appropriately the heat | fever (hot or cold) which is going to store heat from the system side. For example, when the heat storage operation is executed, the underground temperature in the vicinity of the peripheral portion of the buried heat exchanger rises or falls by the amount of heat storage, so that the heat storage can be sufficiently performed.
On the other hand, as in the prior art, when the ground temperature in summer or winter is used, the ground temperature is preferably in a constant temperature state.
Therefore, by selectively configuring the high heat storage side heat exchange unit and the constant temperature side heat exchange unit as an embedded heat exchanger, for example, the storage or use of warm or cold heat that can be generated on the system side referred to in the present application. Situations where it can be determined that the heat storage has been consumed using the high heat storage side heat exchange part (for example, the ground temperature of the high heat storage side heat exchange part is close to the ground temperature around the constant temperature side heat exchange part) ), The use of the constant temperature side heat exchanging section, which is more stable in temperature, can realize efficient use in the ground.

Hereinafter, the absorption system 100 according to the present application will be described, and the operation method of the absorption system 100 will be described.
The absorption system 100 according to the present application includes an evaporator 1, an absorber 2, a regenerator 3 and a condenser 4, and the absorbing liquid a is circulated between the absorber 2 and the regenerator 3 while changing its concentration. The refrigerant b is circulated between the evaporator 1, the absorber 2, the regenerator 3, and the condenser 4 while changing phases. This system 100 is capable of absorbing operation by heat generated from the engine 6 as a heat source device for driving the generator 5 (cooling heat recovered by cooling the engine and heat recovered from the exhaust d). ing. In the embodiment shown in FIG. 1, FIG. 2, FIG. 3, and FIG. 4, the case where the refrigerant b is a water-lithium bromide system in which the water b and the absorbing liquid a are lithium bromide aqueous solutions will be described. In this case, the refrigerant is water, and both the heat medium and the coolant in the present application are water. The absorption system 100 according to the present application includes a three-way valve for circulating the absorption liquid a, the refrigerant b, the heat medium w, the heat medium (cooling water c2), and the cooling liquid (cooling water c1) in a predetermined circulation path, An on-off valve and a pump are provided. In the following description, only the three-way valve, the on-off valve, and the pump that are important in the present application will be described with reference numerals. The three-way valve, the opening / closing setting of the opening / closing valve, and the driving of the pump are executed by the switching means 13a provided in the control device 13 and can realize the operation states described below.

First, the circulation of the absorbent a in the absorption system 100 will be described.
In the absorber 2, the refrigerant b transferred from the evaporator 1 is absorbed by the concentrated solution a1 (the concentrated absorbent a1) returned from the regenerator 3, and a diluted solution a2 is generated. Cooling water c1, which is a coolant, is circulated in the absorber 2, and absorption occurs in the absorber 2 by the cold heat supplied from the cooling water c1. The cooling water c1 recovers the heat generated with the absorption. The dilute solution a2 generated in the absorber 2 is sent to the regenerator 3 by the circulation pump p1 and regenerated (the dilute solution a2 is changed to the concentrated solution a1). The regenerator 3 recovers heat (engine cooling heat and heat recovered from the exhaust d) generated from the engine 6 for driving the generator 5, and the diluted solution a2 is concentrated into the concentrated solution a1 by the recovered heat. The circulation path L1 of the heat medium (cooling water c2) is provided between the regenerator 3, the engine 6, and the first exhaust heat exchanger 8a so as to be regenerated. The circulation path L1 for the heat medium (cooling water c2) is provided with an on-off valve v1. Between the absorber 2 and the regenerator 3, a heat exchanger 9 that performs heat exchange between the concentrated solution a 1 that returns to the absorber 2 and the diluted solution a 2 that is sent to the regenerator 3 is provided. An expansion valve v2 is provided.

  Explaining the circulation of the refrigerant b, the refrigerant b moves from the absorber 2 to the regenerator 3 in a state of being absorbed by the absorbing liquid (dilute solution a2). In the regenerator 3, the heat is generated from the engine 6 (cooling heat of the engine 6 and heat recovered from the exhaust d), and is separated from the absorbing liquid a in a gas phase state and transferred to the condenser 4. In the condenser 4, it is cooled by the cooling water c1 sent from the absorber 2 (the cooling water c1 is heated), condensed and returned to the liquid phase. And it flows to the evaporator 1 via the expansion valve v3. In the evaporator 1, separately, heat is received by heat exchange with the heat medium flow path L <b> 2 through which water w, which is a heat medium provided in the evaporator 1, evaporates and is transferred to the absorber 2. To do. In this state, the heat medium w in the heat medium flow path L2 is deprived of heat and cooled.

  In order to perform the above operation, in the absorption system 100 according to the present application, the circulation path L1 of the heat medium (cooling water c2) is provided between the engine 6 and the regenerator 3, so that the cooling heat and exhaust of the engine 6 can be reduced. Regeneration in the regenerator 3 is possible by heat. Further, in the absorber 2 and the condenser 4, a cooling liquid circulation path L3 is provided between the absorber 2, the condenser 4 and the heat-utilizing heat exchanger 10, and in the absorber 2 and the condenser 4, The heat recovered by the cooling water c1 is configured to be discharged and used by the heat utilization heat exchanger 10 to the heat utilization side (see FIG. 1). The coolant circulation path L3 is provided with a circulation pump p2. As for the evaporator 1, a circulation path L4 (shown by a thick solid line in FIG. 3) of the heat medium w can be formed between the cold heat utilization heat exchanger 11 and the heat medium flow path L2 of the evaporator 1. The cold heat generated in the evaporator 1 can be taken out and used by the cold heat utilization heat exchanger 11 (see FIG. 3).

  The above is the description of the basic configuration of the absorption system 100. Hereinafter, regarding the characteristic configuration of the present application, the flow path related to the heat recovery of the heat generated from the engine 6 and the circulation path for using the underground heat. explain.

  As shown in the drawing, the exhaust gas path 6a exhausted from the engine 6 is provided with a first exhaust heat exchanger 8a and a second exhaust heat exchanger 8b as the exhaust heat exchanger 8 in order from the engine side. ing. With this configuration, the first exhaust heat exchanger 8a can recover the high-temperature exhaust heat of the exhaust gas d. Further, the second exhaust heat exchanger 8b can recover the low-temperature exhaust heat that could not be recovered by the first exhaust heat exchanger 8a. Further, with respect to the pair of exhaust heat exchangers 8a and 8b, a connection path 8c for connecting the heat medium flow path provided in the first exhaust heat exchanger 8a and the second exhaust heat exchanger 8b is provided. The on-off valve v1 is closed, the on-off valve v4 provided on the connection path 8c is opened, and the three-way valve v5 is allowed to flow into the embedded heat exchanger 12 from the first exhaust heat exchanger 8a side. By setting the opening and closing so as to do so, it is possible to flow the heat medium integrally with both the exhaust heat exchangers 8a and 8b.

  As shown in the figure, the underground heat exchanger 12 is provided in the ground so that the underground heat can be used. The embedded heat exchanger 12 is connected to the heat medium flow path L2 and the second exhaust heat exchanger 8b provided in the evaporator 1 to form a circulation path (in this application, this state is referred to as a first connection state). FIG. 1 shows a thick solid line), a state in which a circulation path is formed only connected to the heat medium flow path L2 provided in the evaporator 1 (in this application, this state is called a second connection state, and FIG. 2 shows a thick solid line) It is configured to be feasible. Further, in the state where the coolant (cooling water c1) circulates in the absorber 2, the condenser 4 and the heat-utilizing heat exchanger 10, the second exhaust heat exchange is performed on the return from the heat-heat exchanger 10 to the absorber 2. The extended coolant circulation path L5 that passes through the vessel 8b and the embedded heat exchanger 12 is formed (in this application, this state is referred to as a third connection state and is indicated by a thick solid line in FIG. 3). And the second exhaust heat exchanger 8b and the first exhaust heat exchanger 8a are configured to be able to form an exhaust heat underground heat storage circuit L6 through which the heat medium flows in the order of description (in this application, this state is the first This is called a four-connection state, and is indicated by a thick solid line in FIG.

The above is the description of each device provided in the absorption system 100 according to the present application. In the absorption system 100, the control device 13 that realizes each operation operation state described above is provided. As shown in FIG. 1 and the like, the control device 13 is provided with a switching means 13a, which switches at least opening / closing of each on-off valve provided in the absorption system 100, switching on / off of three-way valves, and operation of each pump. By controlling, a predetermined circulation path is formed, and each operation operation state in which a heat medium (including cooling water c1 and c2) is circulated through these circulation paths is configured to be realizable.
Hereinafter, the operation operation control by the switching means 13a will be described with reference to FIGS.

1 First Operation State This operation state is the operation state shown in FIG. 1, and basically, heat is pumped from the ground through the embedded heat exchanger 12, and the heat-utilizing heat exchanger 10 through the cooling water c1. It is an operating state in which the heat is taken out from and used. This operation state corresponds to the underground heat utilization operation referred to in the present application.
In this operating state, the heat generated from the engine 6 is recovered by the heat medium circulation path L1 including the first exhaust heat exchanger 8a, and between the evaporator 1, the absorber 2, the regenerator 3, and the condenser 4. The refrigerant b circulates, and the absorbing liquid a circulates between the absorber 2 and the regenerator 3 (in FIG. 1, a thin line arrow indicates this state). Accordingly, the absorption system 100 performs an absorption operation.

On the other hand, the circulation path including the embedded heat exchanger 12 is the first connection state, and the heat recovered from the ground and the heat recovered by the second exhaust heat exchanger 8b are The refrigerant b is used for evaporation (in FIG. 1, this state is indicated by a thick line with an arrow). Then, a coolant circulation path L3 for the coolant (cooling water c1) is formed across the absorber 2, the condenser 4 and the heat-utilizing heat exchanger 10, and the absorber 2 and the condenser 4 are used for cooling. Then, the coolant (cooling water c1) whose temperature has risen is sent to the heat-utilizing heat exchanger 10, and the heat can be taken out and used by releasing the heat to the outside. Therefore, in this operating state, the heat pumped up from the ground is output via the coolant.
As shown in FIG. 1, this operating state is mainly an operating state that is executed in winter.

2 Second Operation State This operation state is the operation state shown in FIG. 2 and is basically an operation state in which cold heat generated by the evaporator 1 is stored in the ground via the buried heat exchanger 12. This operation state corresponds to the cold ground heat storage operation referred to in the present application.
Even in this operating state, the heat generated by the engine 6 is recovered by the heat medium circulation path L1 including the first exhaust heat exchanger 8a, and the space between the evaporator 1, the absorber 2, the regenerator 3, and the condenser 4 is recovered. The refrigerant b circulates, and the absorbing liquid a is circulated between the absorber 2 and the regenerator 3 (in FIG. 2, the thin line arrows indicate this state, and cold heat is discharged into the ground and stored. ) Accordingly, the absorption system 100 performs an absorption operation.

On the other hand, the circulation path including the embedded heat exchanger 12 is in the second connection state, and is used for heating the refrigerant b in the evaporator 1, and the cooled heat medium is guided to the embedded heat exchanger 12. As a result, the heat generated in the evaporator 1 is stored in the ground by exchanging heat with the ground (in FIG. 2, this state is indicated by a thick line with an arrow).
As shown in FIG. 2, this operating state is mainly an operating state that is executed in the spring.

3 Third operation state This operation state is the operation state shown in FIG. 3, and basically, an operation state in which cold heat is pumped from the ground through the embedded heat exchanger 12 and the cold generated in the evaporator 1 is used. It is. This operating state corresponds to the operation using underground heat as referred to in the present application.
Even in this operating state, the heat generated in the engine 6 is recovered, and the refrigerant b circulates between the evaporator 1, the absorber 2, the regenerator 3, and the condenser 4, and the absorbing liquid a is absorbed in the absorber 2, the regenerator. 3 in order of description (in FIG. 3, this state is indicated by a thin line arrow). Accordingly, the absorption system 100 performs an absorption operation.

  On the other hand, the circulation path including the embedded heat exchanger 12 is in the third connection state, and the cooling liquid (cooling water c1) is cooled by the cold heat pumped from the ground, and the absorber 2 and the condenser 4 (In FIG. 3, this state is indicated by a thick broken line with an arrow in FIG. 3). Then, by performing the absorption operation, the cold heat generated in the evaporator 1 is taken out and used by the cold heat utilization heat exchanger 11 (in FIG. 3, this state is indicated by a thick line with an arrow). Therefore, in this operation state, the cold generated from the ground is also used to output the cold generated in the evaporator 1. As shown in FIG. 3, this operating state is mainly an operating state that is executed in the summer.

4 Fourth Operation State This operation state is the operation state shown in FIG. 4, and basically the heat recovered by the exhaust heat exchanger 8 (8a, 8b) is underground through the embedded heat exchanger 12. It is the operation state which stores heat. This operation state corresponds to the thermal underground heat storage operation as referred to in the present application.
Since this operation state is intended to store the exhaust heat in the ground, the refrigerant b does not circulate between the evaporator 1, the absorber 2, the regenerator 3 and the condenser 4, and the absorbent a Does not circulate between the absorber 2 and the regenerator 4 (in FIG. 4, this state is indicated by the absence of an arrow on the thin line). That is, the absorption system 100 does not perform an absorption operation.

On the other hand, as the circulation path including the embedded heat exchanger 12, the heat medium heated in the first exhaust heat exchanger 8a and the second exhaust heat exchanger 8b is in the fourth connected state, and the embedded heat exchange is performed. The heat generated by the engine 6 is stored in the ground by being guided to the vessel 12 and exchanging heat with the ground (in FIG. 4, this state is indicated by a thick line with an arrow). .
As shown in FIG. 4, this operating state is mainly an operating state that is executed in the fall.

  Although the above is description of the structure of the absorption system 100 in this application, below, the operation | movement form of the absorption system 100 throughout a year is demonstrated. The driving mode in this example is divided into an autumn / winter driving mode over autumn and winter and a spring / summer driving mode over spring and summer.

1. Fall / Winter Operation At this time, as shown in FIG. 4, in the fall, the heat generated from the engine 6 is stored in the ground via the buried heat exchanger 12 without performing an absorption operation. As shown in FIG. 1, the heat storage step is executed, and in the winter, the heat stored in the ground in the hot underground heat storage step is pumped through the embedded heat exchanger 12, and the coolant (cooling water c1) is supplied. Take out the heat and execute the underground heat utilization step to use.
In this way, heat can be stored underground in the autumn, and the stored heat can be pumped and used in the winter.

2 Spring / Summer Operation At this time, as shown in FIG. 2, in the spring, the heat generated from the engine 6 is used to perform the absorption operation, and the cold generated from the evaporator 1 is buried in the embedded heat exchanger. As shown in FIG. 3, in the summer, the cold heat stored in the ground in the cold ground heat storage step is passed through the buried heat exchanger 12 as shown in FIG. Then, a step of using the underground cold is used, which is pumped into the cooling liquid (cooling water c1) and used for generating cold heat by the evaporator 1.
In this way, it is possible to store the cold generated by the evaporator in the ground by using the exhaust heat in the spring, and pump and use the stored cold in the summer.

  Here, it is preferable that the coolant temperature at the time of execution of the underground cold utilization step in summer is higher than the coolant temperature at the time of execution of the cold underground heat storage step in spring. By making the coolant temperature in the cold underground heat storage step lower than the coolant temperature in the underground heat utilization step, a temperature difference is secured in the absorption system 100 according to the timing of executing each step. , Can ensure a good operating state of the system. Furthermore, the operation at high COP becomes possible by setting the coolant temperature in summer to be relatively high and using the underground heat. On the other hand, by keeping the coolant temperature in the spring relatively low, the amount of heat that can be generated in the spring can be secured and the amount can be increased.

  So far, the case where the absorption liquid is an aqueous solution of lithium bromide and the refrigerant b is water has been described, but in the absorption system 100 shown in FIGS. 1 to 4, by appropriately maintaining the pressure in the system, The refrigerant b can be ammonia, and the absorbing liquid a can be an aqueous ammonia solution.

[Another embodiment]
(1) In the above embodiment, an independent heat medium flow path L2 is provided in the evaporator 1, and the heat medium that flows in the flow path L2 is used as the cold heat utilization heat exchanger 11 and the embedded heat exchange. The absorption system 100 can be operated by sending it to the evaporator 12, the second exhaust heat exchanger 8b, etc., but it returns to the evaporator 1 without providing an independent heat medium flow path L2 in the evaporator 1. You may employ | adopt the structure which the heat medium which comes and the refrigerant | coolant in the evaporator 1 mix. In this case, the refrigerant and the heat medium are the same. 5 to 8 show the operation state of the absorption system 100 in this case corresponding to FIGS. 1 to 4. FIG. 5 shows a driving state in winter, FIG. 6 shows a driving state in spring, FIG. 7 shows a driving state in summer, and FIG. 8 shows a driving state in autumn. This embodiment can be implemented in an ammonia-water system in which the refrigerant is ammonia and the absorbent is an aqueous ammonia solution.
(2) In the above-described embodiment, a cold underground heat storage step for performing cold underground heat storage operation in the spring is performed, and a underground cold utilization step for performing underground cold utilization operation in the summer is performed. The example which performs the thermal underground thermal storage step which performs a thermal underground thermal storage operation, and performs the underground thermal utilization step which performs underground thermal utilization operation in winter was shown.
This example is an example of paying attention to the ground temperature of the four seasons and switching the operation appropriately while paying attention to the heat storage capacity, but when focusing on the heat storage capacity in the ground, for example, in units of one day, It is also possible to switch the predetermined operation state.
As an example, with a day in late spring as a unit, a cold underground heat storage step that performs cold underground heat storage operation at night is executed, and an underground cold utilization step that performs underground cold use operation during the day is executed. May be. In addition, by using the late autumn day as a unit, a thermal underground thermal storage step for performing thermal underground thermal storage operation during the day may be executed, and an underground thermal usage step for performing underground thermal usage operation at night may be executed. .
(3) In the above embodiment, the installation site of the embedded heat exchanger was not particularly described. However, the embedded site of the embedded heat exchanger is a site that can store heat or cold in the ground. It is assumed that. That is, in the heat storage operation in spring and autumn shown in FIG. 2 and FIG. 4, an underground part capable of storing heat may be employed so that the ground temperature rises or falls, for example, by about 1 degree. In the case of this configuration, the buried part of the buried heat exchanger of the present application is a shallow part on the shallow side with respect to the buried part of the buried heat exchanger in the prior art (a deep part or a part where groundwater flows nearby). Or it becomes a site where groundwater does not flow nearby.

Furthermore, in order to construct an absorption system that can also perform the operation of the technology that has been conventionally employed, a high heat storage side heat exchanging part provided in an underground part having a high heat storage capacity (ground water is located at or near the shallow part on the shallow side). And a constant temperature side heat exchange section that has a lower heat storage capacity than the high heat storage side heat exchange section and is kept at a constant temperature state (located at a deep depth section or a section where groundwater flows nearby) And the high heat storage side heat exchange part and the constant temperature side heat exchange part can be selectively configured to be used as an embedded heat exchanger. By adopting this configuration, it is possible to use the high heat storage side heat exchange part in the operation state of heat storage or utilization accompanying the generation of heat or cold, and to judge that the heat storage has been consumed (for example, around the high heat storage side heat exchange part Efficient underground use is realized by using the constant temperature side heat exchange section where the underground temperature is close to the underground temperature around the constant temperature side heat exchanger) it can.
(4) In the above embodiment, an example is shown in which the heat-use heat exchanger and the cold-use heat exchanger are configured as separate heat exchangers. For example, heat and cold for indoor air conditioning If the utilization object is the same, a single heat exchanger may be provided, and by switching the circulation path, the heat exchanger may work as a heat-use heat exchanger or a cold-use heat exchanger. .
(5) In the above-described embodiment, in the fourth operating state, the example in which the heat stored in the exhaust gas is stored in the ground has been shown. Naturally, the cooling heat recovered to cool the engine May be stored. Corresponding to FIG. 4 described above, FIG. 9 shows an example in which not only the heat held by the exhaust gas but also the cooling heat of the engine is stored in the ground in the fourth operating state. In this example, as shown in the figure, the on-off valve v1 is closed, the on-off valve v4 is opened, and the three-way valve v6 is set to open and close to allow inflow from the engine 6 to the embedded heat exchanger 12. The heat generated from the engine (cooling heat and exhaust heat retained by the exhaust gas) can be stored in the ground.

  In addition to the winter and summer seasons, in addition to the spring and autumn seasons, which are intermediate periods, we have obtained an operation method for an absorption system that can effectively use the heat generated from the heat source, and have obtained such an absorption system.

The figure which shows the driving | running state of the absorption system of this invention in winter The figure which shows the driving | running state of the absorption system of this invention in the spring The figure which shows the operating state of the absorption system of this invention in summer The figure which shows the driving | running state of the absorption system of this invention in autumn The figure which shows the driving | running state of the absorption system of another embodiment of this invention in winter. The figure which shows the driving | running state of the absorption system of another embodiment of this invention in the spring season The figure which shows the driving | running state of the absorption system of another embodiment of this invention in the summer The figure which shows the driving | running state of the absorption system of another embodiment of this invention in autumn The figure which shows the driving | running state of another embodiment of the absorption system of this invention in autumn

Explanation of symbols

1: Evaporator 2: Absorber 3: Regenerator 4: Condenser 5: Generator 6: Engine (heat source machine)
10: Heat utilization heat exchanger 11: Cold heat utilization heat exchanger 12: Buried heat exchanger 100: Absorption system a: Absorption liquid b: Refrigerant c1: Cooling water (cooling liquid)
c2: Cooling water d: Exhaust gas

Claims (8)

An evaporator, an absorber, a regenerator, and a condenser, driven by heat generated from a heat source unit, and an embedded heat exchanger that exchanges heat between the refrigerant in the evaporator and the ground,
The operation method of the absorption system configured to pump up the underground heat through the buried heat exchanger and output the heat through the coolant flowing through the absorber and the condenser,
Performing a thermal underground heat storage step of storing the heat generated from the heat source device in the ground via the buried heat exchanger;
Operation of an absorption system that performs the underground heat utilization step of pumping up the heat stored in the ground in the heat underground heat storage step through the embedded heat exchanger, taking out the heat through the cooling liquid, and using the heat Method.   The operation method of the absorption system according to claim 1, wherein the thermal underground heat storage step is executed in autumn and the underground thermal utilization step is executed in winter. An evaporator, an absorber, a regenerator, and a condenser, driven by heat generated from a heat source unit, and an embedded heat exchanger that exchanges heat between the refrigerant in the evaporator and the ground,
Thermal underground heat storage operation for storing the heat generated from the heat source unit in the ground via the buried heat exchanger,
An absorption system configured to perform an underground heat utilization operation in which underground heat is pumped through the buried heat exchanger and the heat is output via a coolant flowing through the absorber and the condenser. An embedded heat exchanger that includes an evaporator, an absorber, a regenerator, and a condenser, is driven by heat generated from a heat source device, and exchanges heat between the coolant flowing through the absorber and the condenser and the ground. Equipped with
An operation method of the absorption system configured to pump up the cold in the ground through the buried heat exchanger and output the cold by the evaporator,
Using the heat generated from the heat source unit, performing a cold underground heat storage step of storing cold heat generated from the evaporator in the ground through the buried heat exchanger,
Absorption in which the cold heat stored in the ground in the cold ground heat storage step is pumped into the coolant via the buried heat exchanger and used to generate cold heat by the evaporator How to operate the system.   The operation method of the absorption system according to claim 4, wherein the cold underground heat storage step is executed in spring and the underground cold utilization step is executed in summer.   The operation method of the absorption system according to claim 5, wherein a coolant temperature at the time of executing the underground cold utilization step in summer is higher than a coolant temperature at the time of executing the cold underground heat storage step in spring. An embedded heat exchanger that includes an evaporator, an absorber, a regenerator, and a condenser, is driven by heat generated from a heat source device, and exchanges heat between the coolant flowing through the absorber and the condenser and the ground. Equipped with
Using the heat generated from the heat source machine, cold storage heat storage operation to store the cold generated from the evaporator in the ground through the buried heat exchanger,
Via the embedded heat exchanger, it is configured to be able to execute underground cold utilization operation capable of pumping the cold in the ground to the coolant flowing through the absorber and the condenser and outputting the cold by the evaporator. Absorption system. A high heat storage side heat exchange part provided in the underground part having a high heat storage capacity, and a constant temperature side heat exchange part that has a lower heat storage capacity than the high heat storage side heat exchange part and is kept in a constant temperature state,
The absorption system according to claim 3 or 7, wherein the high heat storage side heat exchanging part and the constant temperature side heat exchanging part can be selectively used as the buried heat exchanger.

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