JP4315391B2 - Absorption heat pump - Google Patents

Description

  The present invention relates to an absorption heat pump that uses unused energy such as the amount of heat held by the atmosphere as a low-temperature heat source.

As an example of a heat pump according to the prior art, a single effect heat increase type heat pump is shown in FIG.
In FIG. 12, a single effect heat increase type heat pump denoted by PA as a whole system, for example, takes in a regenerator 1 in which city gas is introduced as fuel from a fuel supply line Lf, and air heat Q _L from outside the system, for example. The evaporator 2 which evaporates a refrigerant | coolant, the absorber 3 in which the liquid phase absorber absorbs a gaseous-phase refrigerant | coolant (refrigerant vapor | steam), and the condenser 4 in which a refrigerant | coolant vapor | steam condenses are provided.

It arrange | positions so that the cooling water line Lw may pass along the absorber 3 and the condenser 4, and it is comprised so that the absorber 3 and the condenser 4 may be cooled with the cooling water which flows through the cooling water line Lw. The absorber 3 and the regenerator 1 are connected by absorption solution lines L1 and L2 in which a circulation pump 5 is interposed. A solution heat exchanger 6 is interposed in the lines L1 and L2, and the heat of the solution in the line L2 is administered to the solution in the line L1.
The regenerator 1 is equipped with a rectifier 11, and the rectifier 11 vaporizes the absorbent (for example, water) in the regenerator 1 and moves to the condenser 4 side together with the refrigerant vapor (for example, ammonia vapor). The gas-phase absorbent (for example, water vapor) is condensed and separated from the regenerated refrigerant vapor. At the same time, the rectifier 11 is configured to heat the absorbent solution flowing through the absorbent solution line L <b> 1 in a region closer to the absorber 3 than the solution heat exchanger 6, thereby raising the temperature.

Refrigerant vapor (for example, ammonia vapor) separated from the gas phase absorbent in the rectifier 11 flows through the line L3 to the condenser 4, where heat of vaporization is taken away in the condenser 4 to condense and liquid phase. It becomes a refrigerant (for example, 100% ammonia), and this liquid-phase refrigerant flows through the line L4 and flows into the evaporator 2.
Liquid refrigerant in the evaporator 2, depriving heat of vaporization from the air heat Q _L evaporated in the evaporator 2, returns to the absorber 3 via the line L5 (also exists if merely opening).
In the example of FIG. 12, in the evaporator 2, while evaporating the liquid phase refrigerant by the thermal energy (air heat) Q _L from the atmosphere, the thermal energy (air heat) from the atmosphere as well as Q _L only, rivers Even unutilized energy held by water and sewage is configured to be usable.

In the absorber 3, the refrigerant vapor is absorbed by the absorbing solution returned from the regenerator 1, and the absorbent concentration in the absorbing solution is reduced. The absorbent solution (dilute solution) having a reduced absorbent concentration exits the absorber 3 and is sent to the regenerator 1 by the circulation pump 5. Here, in the absorber 3, absorption heat (latent heat) is generated when the refrigerant vapor is absorbed by the absorption solution.
This absorbed heat is input to the cooling water flowing through the cooling water line Lw. And the cooling water which flows through the cooling water line Lw takes away the heat of absorption (latent heat) which generate | occur | produced in the absorber 3, cools the absorber 3, and takes the heat of vaporization from refrigerant | coolant vapor | steam (gas-phase refrigerant | coolant) in the condenser 4. To condense (use liquid phase refrigerant).
That is, the absorption heat generated in the absorber 3 and the heat of vaporization taken from the refrigerant vapor by the condenser 4 are input to the cooling water flowing through the cooling water line Lw and heated. As a result, the cooling water flowing through the cooling water line Lw is heated to an extent that can meet the demand for hot water supply and taken out as hot water (hot water supply).

Here, in the absorption heat pump of the prior art shown in FIG. 12, if the hot water supply temperature or the water supply temperature rises, the heat pump cycle performance deteriorates, and the merit of operation with high efficiency cannot be enjoyed. Therefore, it has been difficult to increase the hot water supply temperature.
Further, when the hot water supply temperature or the water supply temperature rises, the temperature level in the regenerator 1 also rises, causing problems such as corrosion.
Furthermore, the absorption heat pump that requires time for heating the absorption solution in the regenerator 1 has a long time (rise time) until a desired hot water supply temperature is obtained, and therefore, when the hot water supply operation needs to be repeated intermittently. Is inconvenient.

As another conventional technique, for example, when the atmospheric temperature is low and the circulating water for atmospheric heat exchange is not sufficiently heated, the circulating water for atmospheric heat exchange is heated by condensation heat, and the circulating water for atmospheric heat exchange is sufficiently high because the atmospheric temperature is high. An absorption heat pump system that cools the circulating water for atmospheric heat exchange using heat of vaporization when it is not cooled is proposed (Patent Document 1).
However, the related art is intended to surely execute the heating operation even when the temperature is low, and to surely execute the cooling operation even when the temperature is high, in the case where the hot water supply temperature or the water supply temperature rises. It does not solve the problem of the absorption heat pump.
JP-A-2005-77037

  The present invention has been proposed in view of the above-described problems of the prior art, can achieve a high hot water supply temperature, and appropriately cope with a case where the hot water supply operation needs to be repeated intermittently. It is an object of the present invention to provide an absorption heat pump and a control method thereof.

The absorption heat pump of the present invention includes a regenerator (1) that is supplied with fuel by a fuel supply line (Lf) and heated, and an evaporator (2) that takes in heat energy (Q _L ) from outside the system and evaporates the refrigerant. And an absorber (3) in which the liquid phase absorbent absorbs the refrigerant and a condenser (4) in which the refrigerant vapor condenses, and the cooling water line (Lw) is connected to the absorber (3) and the condenser ( 4), the absorber (3) and the regenerator (1) are connected by an absorbing solution line (L1, L2) interposed in a circulation pump (5), and the cooling water A three-way valve (V3) is interposed in the line (Lw) and the second line passes through the first line (Lw1) and the regenerator (1) that pass through the condenser (4) and the absorber (3). Branched to the line (Lw2), the refrigerant vapor generated in the regenerator (1) is condensed A first on-off valve (V1) is provided in the refrigerant vapor line (L3) flowing through (4), and a second on-off valve (V2) is provided in the absorbing solution line (L1, L2) through which the absorbing solution circulates to regenerate. The three-way valve (V3), the first on-off valve (V1) and the second on-off valve (V2) in response to a signal from the regenerator measuring means (STg) for measuring the temperature (Tg) or pressure of the vessel (1). ) And the circulation pump (5) are provided. The control unit (200) receives a signal from the regenerator measuring means (STg) and then the boiler operation mode is instructed by the operator. Then, the first on-off valve (V1) and the second on-off valve (V2) are closed, the three-way valve (V3) is made to communicate with the cooling water line (Lw) on the second line (Lw2) side, Stop circulation pump (5) and heat When the pump operation mode is instructed, the first on-off valve (V1) and the second on-off valve (V2) are opened, and the three-way valve (V3) is connected to the first line (Lw1) side with the cooling water line (Lw). Further, the circulation pump (5) is driven, and then it is determined whether or not the temperature (Tg) or pressure of the regenerator (1) is equal to or lower than a set value. If it is below, it has the function to perform heat pump operation.

The absorption heat pump of the present invention includes a regenerator (1) that is supplied with fuel through a fuel supply line (Lf) and heated, and an evaporator (2) that takes in heat energy (Q _L ) from outside the system and evaporates the refrigerant. ), An absorber (3) in which the liquid-phase absorbent absorbs the refrigerant, and a condenser (4) in which the refrigerant vapor is condensed, and the cooling water line (Lw) is the absorber (3) and the condenser In the absorption heat pump cooling (4), the absorber (3) and the regenerator (1) are connected by an absorption solution line (L1, L2) interposing a circulation pump (5), and the cooling A three-way valve (V3) is interposed in the water line (Lw), and the first line (Lw1) that passes through the condenser (4) and the absorber (3) and the second that passes through the regenerator (1). Branch line (Lw2) and the refrigerant vapor generated in the regenerator (1) A first open / close valve (V1) is provided in the refrigerant vapor line (L3) flowing through the compressor (4), and a second open / close valve (V2) is provided in the absorbent solution line (L1, L2) through which the absorbent solution circulates. The regenerator measuring means (STg) for measuring the temperature (Tg) or pressure of the regenerator (1) and the hot water supply temperature (T1) downstream of the first and second cooling water (Lw1, Lw2) confluence (GP) ), The second temperature measuring means (ST2) for measuring the cooling water temperature (T2), and the third temperature for measuring the unused energy temperature introduced from the outside. A control unit (200) that receives the signal from the measuring means (ST3) and controls the three-way valve (V3), the first on-off valve (V1), the second on-off valve (V2), and the circulation pump (5). ), And its control unit (200) plays The first opening / closing operation is performed when the boiler operation mode is instructed by the operator after receiving signals from the instrument measuring means (STg) and the first temperature measuring means (ST1) to the third temperature measuring means (ST3). The valve (V1) and the second on-off valve (V2) are closed, the three-way valve (V3) is connected to the cooling water line (Lw) on the second line (Lw2) side, and the circulation pump (5) is further connected. When the heat pump operation mode is instructed, the first on-off valve (V1) and the second on-off valve (V2) are opened, and the three-way valve (V3) is connected to the first line (Lw1) on the cooling water line ( Lw) communicate with each other, further drive the circulation pump (5), and signals from the regenerator measuring means (STg) and the first temperature measuring means (ST1) to the third temperature measuring means (ST3). By heat pump operation area and The control function (F) indicating the area of the boiler operation is calculated, and if the control function (F) is within the boiler operation area for a certain time, the boiler operation is performed, and if it is within the heat pump operation area, the heat pump operation is performed. It has a function.

  In the absorption heat pump of the present invention, the regenerator (1) is provided with a rectifier (11) for removing the vaporization heat of the gas phase absorbent and separating the gas phase absorbent from the refrigerant vapor, and the cooling water line (Lw). ) Passes through the rectifier (11) and the absorption solution line (L1) from the circulation pump (5) preferably passes through the rectifier (11).

  In the absorption heat pump of the present invention, the regenerator (1) is provided with a rectifier (11) for removing the vaporization heat of the vapor-phase absorbent and separating the vapor-phase absorbent from the refrigerant vapor, and the regenerator (1). An exhaust gas line (Lg) for the exhaust gas combusted in 1) is provided, a latent heat recovery heat exchanger (7) for exchanging heat with the exhaust gas line (Lg) is provided in the cooling water line (Lw), and the cooling water line (Lw) is It is preferable to pass through a reservoir (11).

The absorption heat pump of the present invention includes a regenerator (1) that is supplied with fuel through a fuel supply line (Lf) and heated, and an evaporator (2) that takes in heat energy (Q _L ) from outside the system and evaporates the refrigerant. ), An absorber (3) in which the liquid-phase absorbent absorbs the refrigerant, and a condenser (4) in which the refrigerant vapor is condensed, and the cooling water line (Lw) is the absorber (3) and the condenser In the absorption heat pump that cools (4), the regenerator (1) is provided with a rectifier (11) that takes the heat of vaporization of the vapor-phase absorbent and separates the vapor-phase absorbent from the refrigerant vapor, The cooling water line (Lw) passes through the condenser (4) and the absorber (3), and the absorption solution line (L1) connected to the absorber (3) via a circulation pump (5) is connected to the rectifier. Via the regenerator (11) via the regenerator (11) to another absorbent solution line ( 2) is connected to the absorber (3), and another line (L20) through which the refrigerant vapor generated in the regenerator (1) flows into the absorber (3) is provided, and the other line (L20) is provided. An on-off valve (V1) is provided, and a regenerator measuring means (STg) for measuring the temperature (Tg) or pressure of the regenerator (1) is provided, and the on-off valve (V1) is received by a signal from the regenerator measuring means (STg). ), And the control unit (200) first measures the temperature (Tg) or pressure of the regenerator (1) by the regenerator measuring means (STg) and then the boiler from the operator. When the operation mode is instructed, the on-off valve (V1) is opened, and when the heat pump operation mode is instructed, the on-off valve (V1) is closed, and the temperature (Tg) or pressure of the regenerator (1) is below the set value. Whether or not If it is below, the heat pump operation is performed, and if it exceeds, the boiler operation is performed.

The absorption heat pump of the present invention includes a regenerator (1) that is supplied with fuel through a fuel supply line (Lf) and heated, and an evaporator (2) that takes in heat energy (Q _L ) from outside the system and evaporates the refrigerant. ), An absorber (3) in which the liquid-phase absorbent absorbs the refrigerant, and a condenser (4) in which the refrigerant vapor is condensed, and the cooling water line (Lw) is the absorber (3) and the condenser In the absorption heat pump that cools (4), the regenerator (1) is provided with a rectifier (11) that takes the heat of vaporization of the vapor-phase absorbent and separates the vapor-phase absorbent from the refrigerant vapor, The cooling water line (Lw) passes through the condenser (4) and the absorber (3), and the absorption solution line (L1) connected to the absorber (3) via a circulation pump (5) is connected to the rectifier. Via the regenerator (11) via the regenerator (11) to another absorbent solution line ( 2) is connected to the absorber (3), and another line (L20) through which the refrigerant vapor generated in the regenerator (1) flows into the absorber (3) is provided, and the other line (L20) is provided. A regenerator measuring means (STg) for measuring the temperature (Tg) or pressure of the regenerator (1) and a first temperature measuring means for measuring the outlet temperature of the cooling water line (Lw), provided with an on-off valve (V1). ST1), a second temperature measuring means (ST2) for measuring the inlet temperature thereof, and a third temperature measuring means (ST3) for measuring the unused energy temperature introduced from the outside are provided, and these regenerator measuring means (STg) and a control unit (200) for controlling the on-off valve (V1) by signals from the temperature measuring means (ST1 to ST3), and the control unit (200) is connected to the regenerator measuring means (STg) and the first Thermometer When the boiler operation mode is instructed by the operator after receiving signals from the measurement means (ST1) to the third temperature measurement means (ST3), the on-off valve (V1) is opened and the heat pump operation mode is instructed. The on-off valve (V1) is closed, and the region of the heat pump operation and the boiler operation are determined by signals from the regenerator measuring means (STg) and the first temperature measuring means (ST1) to the third temperature measuring means (ST3). A control function (F) indicating a region is calculated, and if the control function (F) is within the boiler operation region for a certain time, the boiler operation is performed, and if within the heat pump operation region, the heat pump operation is performed. .

Here, for example, water can be selected as the absorbent and ammonia can be selected as the refrigerant.
However, it is not limited to this, For example, it is also possible to select an organic medium (fluorinated alcohol). It is desirable to use a combination of a refrigerant and an absorbent so that there is no risk of precipitation when the temperature level of the absorber rises.
In addition, when heating the regenerator, fuel such as city gas may be input, or high-pressure steam or the like may be supplied to the regenerator. The mode of heating is not particularly limited.

  According to the present invention having the above-described configuration, the first line (Lw1) flowing through the absorber (3) after the cooling water line (Lw) passes through the condenser (4), and the regenerator (1). Branching to a second line (Lw2) passing through (Claim 1, Claim 5). And when high efficiency is acquired as an absorption heat pump, a cooling water line (Lw) is switched to the said 1st line (Lw1) side, and an absorption heat pump is made to perform normal heat pump operation | movement.

  On the other hand, when high efficiency cannot be obtained as an absorption heat pump, the branching means (three-way valve V3) is switched to the second line (Lw2) side, and the regeneration cycle of the refrigerant vapor regenerated by the regenerator (1) is performed. Shut off (close the on-off valve V2) and shut off the circulation of the absorbing solution (close the on-off valve V1) (boiler operation). As a result, when the cooling water flows through the second cooling water line (Lw2) and passes through the regenerator (1), the heat of combustion of the fuel is input in the regenerator (1) to heat and raise the temperature. Therefore, the regenerator (1) is used like a fuel-fired boiler.

As a result of using the regenerator (1) like a fuel-fired boiler, even if the hot water supply temperature or the water supply temperature rises, it can be heated without lowering the efficiency.
And since absorption solution is not circulated as an absorption heat pump, problems, such as corrosion, do not arise.
Furthermore, unlike the absorption heat pump, the cooling water in the second cooling water line (Lw2) is heated and heated without requiring time until the absorption solution is heated. It becomes possible to cope with it.

  Further, in the present invention, a line (L20) is provided that connects the regenerator (1) and the absorber (3) and through which the refrigerant vapor generated in the regenerator (1) flows, and opens and closes the line (L20). If means (open / close valve V1) is provided (claims 2-4, claim 6), when normal absorption heat pump operation is to be performed, that is, when high efficiency can be maintained, the line (L20) is interposed. The mounted opening / closing means (open / close valve V1) may be closed.

When high efficiency cannot be maintained by normal absorption heat pump operation, the open / close means (open / close valve V1) interposed in the line (L20) is opened, and the refrigerant vapor generated in the regenerator (1) is converted into a condenser. (4) Directly flow into the absorber (3) via the line (L20) without going through the evaporator (2).
In that state, the refrigerant vapor carries the heat of the regenerator (1) as latent heat to the absorber (3), and the absorbing solution carries the heat of the regenerator (1) as sensible heat to the absorber (3). The temperature level of the absorber (3) rises to near the temperature level of the regenerator (1).
As a result, the cooling water line (Lw) passing through the absorber (3) does not pass through the regenerator (1), but is as hot as being exposed to the combustion heat of the fuel in the regenerator (1). It will be placed in the environment and the same result as fuel-fired boiler operation can be obtained. In this specification, this case is also referred to as “boiler operation”.

  That is, when the efficiency of the absorption heat pump is reduced (for example, when the feed water temperature and the hot water temperature are high), the open / close means (open / close valve V1) interposed in the line (L20) is opened to perform boiler operation. Just do it.

  According to the present invention capable of performing boiler operation, it is possible to realize a hot water supply temperature that has been difficult with a conventional absorption heat pump and to meet intermittent hot water supply demand (intermittently). Driving is possible).

Embodiments of the present invention will be described below with reference to the accompanying drawings.
First, with reference to FIGS. 1-3, the absorption heat pump which concerns on 1st Embodiment of this invention is demonstrated.
In FIG. 1, an absorption heat pump denoted as a whole by 101 is, for example, a regenerator 1 in which city gas is introduced as fuel by a fuel gas supply line Lf, and evaporates refrigerant by taking, for example, air heat Q _L from outside the system. An evaporator in which the evaporator 2 and a liquid phase absorbent (water) (more specifically, a liquid mixture of a liquid phase absorbent and a refrigerant having a high concentration of the absorbent) absorb the refrigerant (ammonia). 3 and a condenser 4 for condensing the refrigerant vapor.

  The absorber 3 and the condenser 4 are configured to be cooled by the cooling water flowing through the cooling water line Lw. The cooling water line Lw communicates with a water supply (not shown), and the water flowing in the cooling water line Lw (cooling water; tap water) flows through the line Lw1 as will be described later, in order of the condenser 4 and the absorber 3. It flows through and is heated and heated during this time.

The absorber 3 and the regenerator 1 are connected by absorption solution lines L1 and L2 interposed with a circulation pump 5, and a solution heat exchanger 6 is interposed in the lines L1 and L2. The solution heat exchanger 6 is configured to administer the heat of the solution in the line L2 to the solution in the line L1.
The regenerator 1 is equipped with a rectifier 11 and separates water vapor (gas phase absorbent) from refrigerant (ammonia) vapor by removing the heat of vaporization of water vapor (gas phase absorbent).

  In the embodiment of FIG. 1, the cooling water line Lw first passes through the rectifier 11. Cooling water having a low temperature before flowing through the condenser 4 and the absorber 3 is supplied to the rectifier 11, thereby improving the separation performance of the refrigerant vapor and the gas phase absorbent in the rectifier 11. It is to do.

The refrigerant vapor (ammonia vapor) generated in the regenerator 1 flows into the condenser 4 through the line L3 and is condensed in the condenser 4 to become a liquid phase refrigerant (100% ammonia liquid). This liquid-phase refrigerant flows into the evaporator 2 via the line L4.
In the evaporator 2, the liquid phase refrigerant is evaporated from outside the system by the air heat Q _L to become a gas phase refrigerant (refrigerant vapor). The evaporated refrigerant vapor flows into the absorber 3 through the line L5. For convenience of explanation, the line L5 is expressed in a pipe shape in the figure, but in an actual machine, it may be configured as a simple opening.

  In the absorber 3, the refrigerant vapor is absorbed by the absorbing solution returned from the regenerator 1 (absorbing solution having a high concentration of absorbent) to generate absorption heat. And the absorption solution which absorbed the refrigerant | coolant leaves the absorber 3 in the state where the density | concentration of the absorber became thin. Then, it is sent to the regenerator 1 by the circulation pump 5.

The evaporator 2 of the absorption heat pump 101 of the first embodiment is also configured to pump up thermal energy (air heat) Q _L from the atmosphere or unused energy (not shown) such as rivers and sewage. .
As shown in the figure, when the air heat Q _L is used, the evaporator 2 is provided with a fan F2 and a heat exchanger (not shown), and the fan F2 is driven to apply air to the heat exchanger (not shown). the liquid phase refrigerant in the heat exchanger is to introduce air heat Q _L.

As described above, the amount of heat Q _M obtained by hot water supply is given by Q _M = Q _H + Q _L.
Since the cooling water flowing through the line Lw is supplied with heat from both the evaporator 2 and the absorber 3, the efficiency (the amount of heat of hot water supply / the amount of heat forcibly loaded with city gas, etc.) exceeds 1.

In FIG. 1, clean water (or return water) that is cooling water is configured to first cool the condenser 4 and then cool the absorber 3 after passing through the condenser 4.
The condenser 4 having a low temperature is cooled with clean water before being heated by the heat pump (the temperature before being raised is low), and the hot water is heated by the condenser 4 and the temperature of the absorber is high. 3 is cooled (compared to the case where the absorber 3 having a high temperature is cooled with clean water having a low temperature before the temperature is raised, and the condenser 4 having a low temperature is cooled with clean water having the temperature raised). This is to reduce energy loss and improve cooling efficiency.

In the embodiment of FIG. 1, the cooling water line Lw has a three-way valve V <b> 3 interposed in a region downstream of the rectifier 11. The cooling water line Lw is branched into a line Lw1 that passes through the condenser 4 and the absorber 3, and a line Lw2 that passes through the regenerator 1.
Here, the regenerator 1 is provided with a heat exchanger (not shown) for heating the cooling water flowing through the cooling water line Lw, and is supplied via the fuel gas line Lf during boiler operation. By burning the fuel, the cooling water in the cooling water line Lw is heated and heated.
The line Lw1 that passes through the condenser 4 and the absorber 3 and the line Lw2 that passes through the regenerator 1 join at the junction GP to be provided for hot water supply demand (not shown).

An open / close valve V1 is interposed in the line L3 through which the refrigerant vapor generated in the regenerator 1 flows to the condenser 4.
In the absorbing solution line L2 from the regenerator 1 to the absorber 3, an open / close valve V2 is interposed in a region between the regenerator 1 and the solution heat exchanger 6.

Then, a temperature sensor STg that measures the temperature Tg inside the regenerator 1, a temperature sensor ST <b> 1 that is arranged downstream of the confluence point GP of the cooling water line Lw and measures the hot water supply temperature T <b> 1, and the absorption heat pump 101 are heated. There are provided a temperature sensor ST2 for measuring the previous cooling water (clean water) temperature T2, and a temperature sensor T3 for measuring the outside air temperature T3 in the vicinity of the evaporator 2.
In the regenerator 1, a pressure sensor (not shown) may be provided instead of the temperature sensor STg.

The absorption heat pump 101 has a control unit 200 that is a control device, and the control unit 200 has a three-way valve V3 and an on-off valve based on temperature data detected by the sensors STg and ST1 to ST3, as will be described in detail later. V1 opening / closing control and fan F2 and pump 5 operation control are performed.
The control unit 200 is connected to the sensors STg, ST1 to ST3 and the input signal line Li, and is connected to the three-way valve V3, the on-off valve V1, the fan F2 and the pump 5 by the control signal line Lo.

  When the absorption heat pump 101 is operated as a heat pump, the three-way valve V3 is controlled to switch to the line Lw1 side toward the condenser 4, the on-off valves V1 and V2 are opened, and the fan F2 is driven. As a result, as described above, the cooling water flowing in the cooling water line Lw1 is heated and heated when passing through the condenser 4 and the absorber 3, and reaches a necessary hot water supply temperature.

On the other hand, when operating the absorption heat pump 101 as a boiler, the three-way valve V3 is controlled to switch to the line Lw2 side through the regenerator 1, the on-off valves V1 and V2 are closed, and the fan F2 and the pump 5 are stopped. .
Since the regenerator 1 is provided with a heat exchanger (not shown) for heating the cooling water flowing through the cooling water line Lw, the fuel supplied through the fuel gas line Lf is burned. The cooling water in the cooling water line Lw is heated and heated. That is, the regenerator 1 is used as a boiler.
At this time, since the on-off valve V1 is closed, the refrigerant vapor is not separated from the absorbing solution and does not flow into the condenser 4. Since the on-off valve V2 is closed and the pump 5 is stopped, the absorbing solution does not circulate between the regenerator 1 and the absorber 3. Furthermore, since the fan F2 is stopped, in the evaporator 2, it is also no air heat Q _L is charged into the refrigerant. Accordingly, the refrigerant regeneration cycle is stopped.

Next, the control of the first embodiment will be described with reference to FIGS. 2 and 3.
Here, FIG. 2 shows control using only the temperature Tg or pressure Pg in the regenerator 1 as parameters, and FIG. 3 shows the hot water supply temperature T1, the cooling water (clean water) temperature T2 before being heated, and the outside air temperature T3. Is mainly used as a control parameter.

In FIG. 2, first, the temperature Tg or pressure of the regenerator 1 is measured by the temperature sensor STg (step S1).
In step S2, an instruction is given as to whether the operation mode is “boiler operation mode” or “heat pump operation mode”. When the “boiler operation mode” is set, the process proceeds to step S3. When the “heat pump operation mode” is set, the process proceeds to step S5.
Here, the instruction in step S2 is an instruction by an operator (an operator not shown). In other words, the determination in step S2 is not based on the automatic control of the control unit 200.
In the case of performing intermittent operation in which hot water supply is intermittently performed, control is performed assuming that an instruction “do boiler operation” is included.

In step S3 to which "boiler operation mode instruction" is given, the on-off valve V1 of the line L3 and the on-off valve V2 of the line L2 are closed, and the three-way valve V3 interposed in the cooling water line Lw is regenerated on the line Lw2 side, that is Communicate to the side via the vessel 1. In step 3, furthermore, the fan F2 equipped in the evaporator 2 is stopped to stop the evaporation of the refrigerant in the evaporator 2, and the circulation pump 5 interposed in the absorption solution line L1 is stopped to stop the absorption solution circulation. . And it progresses to the boiler driving | operation of step S4.
In this boiler operation (step S4), the on-off valves V1 and V2 are kept closed, the three-way valve V3 is kept in communication with the line Lw2 side, that is, the regenerator 1 side, and further, the fan F2 and the circulation are maintained. The pump 5 is kept stopped.
Then, the process proceeds to step S8.

On the other hand, in step S5 to which "heat pump operation mode instruction" is given, the on-off valve V1 and on-off valve V2 are opened, and the three-way valve V3 interposed in the cooling water line Lw is connected to the line Lw1 side, that is, the condenser 4 And communicate with the side via the absorber 3. In step S5, the fan F2 equipped in the evaporator 2 is further operated to evaporate the refrigerant in the evaporator 2, and the circulating pump 5 interposed in the absorbing solution line L1 is driven to circulate the absorbing solution. Then, the process proceeds to step S6.

In step S6, the control unit 200 determines whether or not the temperature Tg (or pressure Pg) of the regenerator 1 is equal to or less than a set value. If the temperature Tg (or pressure Pg) of the regenerator 1 is equal to or lower than the set value (YES in step S6), it is determined that high efficiency is obtained in the heat pump operation and no problems such as corrosion occur, and the heat pump operation is maintained. Then, the process proceeds to step S7.
On the other hand, if the temperature Tg (or pressure Pg) of the regenerator 1 exceeds the set value (NO in step S6), high efficiency can not be obtained as a heat pump, and the problem of corrosion should be considered. (Proceed to step S4).

  In the heat pump operation of step S7, the on-off valve V1 and the on-off valve V2 are maintained open, the three-way valve V3 is maintained on the line Lw1 side, that is, in a state communicating with the condenser 4, and the fan F2 and the circulation pump. 5 is maintained in the driving state.

  In the next step S8, the control unit 200 determines whether or not to end the control. If step S8 is YES, the control ends. If the control is to be continued (NO in step S8), the process returns to step S1, and step S1 and subsequent steps are executed again.

  The control shown in FIG. 2 is a control method in which the system is operated as the temperature Tg or pressure Pg control parameter in the regenerator 1. Therefore, in that case, the temperature sensors ST1 to ST3 in the configuration of FIG. 1 are unnecessary.

The control of FIG. 3 shows the control in the case where the hot water supply temperature T1, the cooling water (clean water) temperature T2 before heating, and the outside air temperature T3 are mainly used as control parameters.
Based on the flowchart of FIG. 3, another control mode of the first embodiment will be described.

In FIG. 3, first, the temperatures T1 to T3 and Tg of the working fluid at various places are measured by the temperature sensors ST1 to ST3 and STg (step S11).
In step S12, it is instructed whether the operation mode is “boiler operation mode” or “heat pump operation mode”, and when the operation mode is “boiler operation mode”, the process proceeds to step S13 and is set to “heat pump operation mode”. If so, the process proceeds to step S15.
Similar to step S2 in FIG. 2, the instruction in step S12 in FIG. 3 is an instruction by an operator (an operator not shown). That is, the determination in step S12 is not based on the automatic control of the control unit 200.
Then, during intermittent operation in which hot water supply is intermittently performed, control is performed on the assumption that an instruction “do boiler operation” is input.

At step S13 "boiler operation mode indication" is given, the on-off valve V1, closes the open closing V2, the three-way valve V3, line Lw2 side, to communicate with the side through the regenerator 1. In step S13, the fan F2 and the circulation pump 5 are further stopped. And it progresses to the boiler driving | operation of step S14.
In this boiler operation (step S14), the on-off valve V1 and the on-off valve V2 are kept closed, the three-way valve V3 is kept in communication with the line Lw2 side, that is, the side through the regenerator 1, and the fan F2 is stopped, evaporation of the refrigerant in the evaporator 2 is stopped, the circulation pump 5 is stopped, and the circulation of the absorbing solution is stopped.
Then, the process proceeds to step S19.

In step S15 to which "heat pump operation mode instruction" is given, the on-off valve V1 and on-off valve V2 are opened, and the three-way valve V3 interposed in the cooling water line Lw is connected to the line Lw1 side, that is, the condenser 4 and the absorption. Communicate to the side via the vessel 3. In step S15, the fan F2 is further operated to evaporate the refrigerant in the evaporator 2, and the circulating pump 5 is driven to circulate the absorbing solution. Then, the process proceeds to step S16.

  In step S16, the control unit 200 calculates the control function F (T1 to T3, Tg) from the data measured in step S11 using the measured temperatures T1 to T3 and Tg (the pressure Pg may be used). To do.

In the next step S17, the control unit 200 determines whether the control function F is a value indicating the heat pump operation region or a value indicating the boiler operation region.
That is, in step S17, calculation processing is performed at temperatures T1, T2, and T3 to determine whether there is a merit of heat pump operation, in other words, whether heat pump operation can be performed with high efficiency. This determination is mainly made based on the temperatures T1, T2, and T3.

However, if the temperature Tg (or pressure Pg) in the regenerator 1 rises too much, a problem of corrosion occurs, so that the heat pump operation is not desirable. Therefore, in making the determination in step S17, it is necessary to consider the temperature Tg (or pressure Pg) in the regenerator 1.
Therefore, even if it is determined from the temperatures T1, T2, and T3 that there is a merit of the heat pump operation, if the temperature Tg or the pressure Pg in the regenerator 1 exceeds the threshold value, the heat pump operation is canceled and the boiler operation (step S14). Switch to the side).

  In step S17, if the control function F is a value indicating a region of heat pump operation (step S17 is “region value of heat pump operation”), the process proceeds to step S18, and the on-off valve V1 and on-off valve V2 are maintained open. The three-way valve V3 is maintained on the line Lw1 side, that is, in a state where it communicates with the condenser 4 and the absorber 3, and further, the state where the fan F2 and the circulation pump 5 are driven is maintained.

  In step S19, the control unit 200 determines whether or not to end the control. If step S19 is YES, the control is terminated. If the control is to be continued (NO in step S19), the process returns to step S11, and step S11 and subsequent steps are executed again.

As described above, according to the absorption heat pump of the first embodiment, when the temperature level is relatively low, the operation as an absorption heat pump can be performed, and the advantage as the absorption heat pump can be obtained that a highly efficient hot water supply operation can be performed.
On the other hand, as an absorption heat pump, when the efficiency of hot water supply temperature or water supply temperature rises (in heat pump operation) decreases, corrosion of the regenerator may occur, or when hot water supply operation is performed intermittently When the conditions become undesirable for operation, the regenerator is used as a boiler to cope with the decrease in efficiency due to the increase in hot water supply temperature and water supply temperature, and hot water supply that is difficult to achieve with conventional hot water supply heat pumps. The regenerator can be prevented from being corroded and intermittent hot water supply demand can be dealt with.

Next, a modification of the first embodiment will be described with reference to FIGS. 4 and 5.
Here, in FIG.4 and FIG.5, illustration of the fan F2 (refer FIG. 1) in the evaporator 2 is abbreviate | omitted.
4 shows a first modification of the first embodiment, and FIG. 5 shows a second modification of the first embodiment.

In the first modification of the first embodiment shown in FIG. 4, the region between the pump 5 and the solution heat exchanger 6 in the absorbing solution line L1 passes through the rectifier 11, and the rectifier in the line L1. 11 is provided with a heat exchanger HX10.
The absorption solution flowing in the line L1 is heated or preheated at a stage before flowing into the regenerator 1 because the heat inside the rectifier 11 is input through the heat exchanger HX10. Fuel consumption can be saved.
Other configurations and operational effects in the modification of FIG. 4 are the same as those of the first embodiment shown in FIGS.

The second modification of the first embodiment shown in FIG. 5 is provided with a latent heat recovery heat exchanger 7 (latent heat recovery unit). The latent heat recovery heat exchanger 7 communicates with a cooling water line Lw and a fuel exhaust gas line Lg through which exhaust gas of fuel combusted in the regenerator 1 flows.
In order to prevent corrosion in the regenerator 1, it is necessary to prevent the exhaust gas of the fuel burned in the regenerator 1 from condensing, and the exhaust gas of the fuel flows through the line Lg in a high temperature state. By providing the latent heat recovery heat exchanger 7, the amount of heat held by the high-temperature exhaust gas flowing through the line Lg is input to the cooling water to heat the cooling water. That is, the thermal energy of the high-temperature fuel exhaust gas is effectively used, which contributes to improving the efficiency of the absorption heat pump.
Other configurations and operational effects in the modified example of FIG. 5 are the same as those of the first embodiment shown in FIGS.

6 to 9 show a second embodiment of the present invention.
1 to 5 and the modification thereof, a cooling water line Lw is branched and a line Lw2 passing through the inside of the regenerator 1 is provided, and the cooling water flowing through the line Lw2 is heated by using the regenerator 1 as a boiler. The temperature was rising. On the other hand, in the second embodiment, it is possible to operate the absorption heat pump as a boiler without branching the cooling water line Lw or via the regenerator 1.

  In the absorption heat pump generally indicated by reference numeral 102 in FIG. 6, the refrigerant vapor generated in the regenerator 1 flows into the absorber 3 in addition to the line L3 where the refrigerant vapor generated in the regenerator 1 flows into the condenser 4. A line L20 is provided, and an open / close valve V1 is interposed in the line L20. The on-off valve V1 is configured to be controlled by the control unit 200.

  The control unit 200 is connected to the sensors STg, ST1 to ST3 and the input signal line Li, and is connected to the on-off valve V1, the fan F2 and the control signal line Lo.

  In FIG. 6, the cooling water line Lw does not pass through the rectifier 11, but for example, as shown in FIG. 1, the amount of heat in the rectifier 11 is input through the rectifier 11. It is also possible to configure.

In FIG. 6, when the absorption heat pump 102 is operated as a heat pump, the on-off valve V1 is closed. In that case, as described with reference to FIG. 1, the cooling water flowing through the cooling water line Lw is heated by the condenser 4 and the absorber 3 to be heated.
On the other hand, when the absorption heat pump 102 is operated as a boiler, the on-off valve V1 may be opened.

By opening the on-off valve V1, the refrigerant vapor generated in the regenerator 1 flows through the line L20 without flowing through the line L3, and directly flows into the absorber 3. This is because, in the absorber 3, the refrigerant vapor is absorbed by the absorbing solution having a high content of the absorbent, so that the pressure is lower than that of the condenser 4 and the regenerator 1.
And in the absorber 1, refrigerant | coolant vapor | steam is absorbed by absorption solution (the content rate of an absorber is high), and generate | occur | produces absorption heat. In addition, since the amount of heat held by the absorbing solution itself heated in the regenerator 1 is added, the temperature level in the absorber 3 rises to the vicinity of the temperature level of the regenerator 1. As a result, the cooling water line Lw that passes through the absorber 3 is heated to the same level as that through the regenerator 1, and the hot water supply temperature that is the same level as when fuel is burned in the boiler is obtained. It is done.

That is, the combustion heat of the fuel in the regenerator 1 is input to the absorber 3 through the line L2 as sensible heat of the absorbing solution, and the absorbent (the absorbing solution having a high content) absorbs the refrigerant vapor. As the absorbed heat (latent heat) generated in the cooling water, the cooling water (clean water) in the cooling water line Lw is heated.
Here, the amount of heat per unit mass of latent heat is larger than the sensible heat, but the mass of the absorbing solution that acts as a heat medium that carries sensible heat is larger than the mass of the circulating refrigerant vapor. Much bigger. Therefore, the amount of heating by sensible heat cannot be ignored.

The contents described above will be described with reference to the pressure-temperature diagram of FIG.
The absorption heat pump cycle when the on-off valve V1 is closed is shown by a solid line in FIG.
7, the point Abi is the state of the inlet of the absorber 3, the point Abo is the state of the outlet of the absorber 3, the point Gi is the state of the inlet of the regenerator 1, and the point Go is the outlet of the regenerator 1. , Point C indicates the state of the condenser 4, and point E indicates the state of the evaporator 4. An arrow VG indicated by a dotted line means that the refrigerant vapor regenerated by the regenerator 1 moves to the condenser 4, and an arrow VA indicated by a dotted line moves the refrigerant vapor evaporated by the evaporator to the absorber 3. It means that.

When the on-off valve V1 is opened and the refrigerant vapor generated in the regenerator 1 moves directly to the absorber 3, the refrigerant vapor does not move from the regenerator 1 to the condenser 4 as indicated by "X" mark NVG. The refrigerant vapor does not move from the evaporator 2 to the absorber 3 as indicated by “×” mark NVA.
In FIG. 7, the fact that the temperature level of the absorber 3 rises to the temperature level of the regenerator 1 indicates that the region sandwiched between the points Abi and Abo is indicated by the points Gi and This is expressed by moving to a region (indicated by a dotted line in FIG. 7) between the temperature level near the point Go, the point AboA, and the point AbiA.

That is, by opening the on-off valve V1, the operation cycle of the absorption heat pump 102 becomes a cycle specified by the point AbiA, the point AboA, the point Gi, and the point Go. The cycle (the cycle specified by the point AbiA, the point AboA, the point Gi, and the point Go) indicates that the temperature in the absorber 3 is almost the same as the temperature in the regenerator 1 that is burning fuel. I mean.
Accordingly, the cooling water passing through the absorber 3 is heated and heated to the same level as when the fuel is burned and heated via the regenerator 1.

Even if a part of the refrigerant vapor regenerated by the regenerator 1 flows into the condenser 4 via the line L3, the heat of vaporization of the refrigerant vapor is input to the cooling water in the condenser 4, so that during the boiler operation It is not a factor that reduces efficiency.
In the boiler operation, if the refrigerant evaporates in the condenser 4, the amount of heat is taken away from the cooling water, resulting in a loss.

In the second embodiment shown in FIG. 6, as described above, since the absorbing solution carries sensible heat from the regenerator 1 to the absorber 3 during the boiler operation, the circulation pump 5 is also driven during the boiler operation, Circulate the absorbent solution. As in the first embodiment, the fan F2 of the evaporator 2 is stopped during boiler operation.
Other configurations of the second embodiment shown in FIG. 6 are the same as those of the first embodiment.

Next, the control of the second embodiment will be described with reference to the flowcharts of FIGS.
8 shows control using only the temperature Tg or pressure Pg in the regenerator 1 as a parameter, and FIG. 9 shows the hot water supply temperature T1, the cooling water (water) temperature T2 before heating, and the outside air temperature T3. Is mainly used as a control parameter.

In FIG. 8, first, the temperature Tg (or pressure Pg) of the regenerator 1 is measured by the temperature sensor STg (step S21).
In step S22, it is instructed whether the operation mode is “boiler operation mode” or “heat pump operation mode”, and in the case of “boiler operation mode”, the process proceeds to step S23 to enter “heat pump operation mode”. If so, the process proceeds to step S25.
As in step S2 in FIG. 2 and step S12 in FIG. 3, the instruction in step S22 in FIG. 8 is an instruction by an operator (an operator not shown) and not by automatic control of the control unit 200. Note that, during intermittent operation in which hot water supply is intermittently performed, control is performed assuming that an instruction “do boiler operation” is input.

In step S23 to which “boiler operation mode instruction” is given, the on-off valve V1 of the line L20 is opened and the fan F2 is stopped. And it progresses to the boiler operation of step S24. In the boiler operation (step S24), the state where the on-off valve V1 is opened and the state where the fan F2 is stopped are maintained. Thereby, the operation cycle as described above with reference to FIG. 7 is executed.
Then, the process proceeds to step S28.

  In step S25 to which "heat pump operation mode instruction" is given, the on-off valve V1 is closed and the fan F2 is driven. Then, the process proceeds to step S26.

  In step S26, the control unit 200 determines whether or not the temperature Tg (or pressure Pg) of the regenerator 1 is equal to or less than a set value. If the temperature Tg (or pressure Pg) of the regenerator 1 is equal to or lower than the set value (YES in step S26), the process proceeds to step S27, and if the temperature Tg (or pressure Pg) of the regenerator 1 exceeds the set value ( (NO in step S26), switching to boiler operation (step S24).

  In the heat pump operation in step S27, the on-off valve V1 is kept closed and the fan F2 is kept driven. Then, the process proceeds to step S28.

  In the next step S28, the control unit 200 determines whether or not to end the control. If step S28 is YES, the control is terminated. If the control is to be continued (NO in step S28), the process returns to step S21, and step S21 and subsequent steps are executed again.

  Next, based on FIG. 9, the control method when the hot water supply temperature T1, the cooling water (up water) temperature T2 before heating, and the outside air temperature T3 are used as control parameters will be mainly described.

First, in step S31, the temperature T1 to T2 of the working fluid in each place and the temperature Tg (or pressure Pg) of the regenerator 1 are measured by the temperature sensors ST1 to ST3 and STg.
In step S32, it is instructed whether the operation mode is “boiler operation mode” or “heat pump operation mode”. If the operation mode is “boiler operation mode”, the process proceeds to step S33, where “heat pump operation mode” is selected. If so, the process proceeds to step S35.
Step S32 in FIG. 9 is an instruction by an operator (an operator not shown) as in step S22 in FIG. 8, and is not by automatic control of the control unit 200. Note that, during intermittent operation in which hot water supply is intermittently performed, control is performed assuming that an instruction “do boiler operation” is input.

In step S33 to which "boiler operation mode instruction" is given, the on-off valve V1 is opened and the fan F2 is stopped. And it progresses to the boiler operation of step S34.
In this boiler operation (step S34), the on-off valve V1 is kept open, and the fan F2 is kept stopped.
Then, the process proceeds to step S39.

  In step S35 to which "heat pump operation mode instruction" is given, the on-off valve V1 is closed and the fan F2 is driven. Then, the process proceeds to step S36.

  In step S36, the control unit 200 calculates a control function F (T1 to T3, Tg) (Pg may be substituted for Tg) from the data measured in step S31.

In the next step S37, the control unit 200 determines whether the control function F is a heat pump operation region value or a boiler operation region value.
That is, similarly to step S17 of FIG. 3, in step S37, calculation processing is performed at temperatures T1, T2, and T3 to determine whether there is a merit of heat pump operation, in other words, heat pump operation can be performed with high efficiency. Judge whether or not. This determination is mainly made based on the temperatures T1, T2, and T3.

However, if the temperature Tg (or pressure Pg) in the regenerator 1 rises too much, a problem of corrosion occurs, so that the heat pump operation is not desirable. Therefore, in making the determination in step S17, it is necessary to consider the temperature Tg (or pressure Pg) in the regenerator 1.
Therefore, even if it is determined from the temperatures T1, T2, and T3 that there is a merit of the heat pump operation, if the temperature Tg or the pressure Pg in the regenerator 1 exceeds the threshold value, the heat pump operation is canceled and the boiler operation (step S14). Switch to the side).

If it is the region value of the heat pump operation in step S37, the process proceeds to step S38, and the state where the on-off valve V1 is closed and the state where the fan F2 is driven is maintained.
Then, the process proceeds to step S39.

  In step S39, it is determined whether or not to end the control. If the control is to be ended (YES in step S39), the control is ended as it is. If the control is to be continued (NO in step S39), the process returns to step S31, and step S31 and subsequent steps are continued again.

Also in the second embodiment, high temperature hot water supply that is difficult to achieve with a conventional absorption heat pump is possible, and it is possible to cope with intermittent hot water supply demand.
Furthermore, even in a temperature condition where it is difficult to operate with high efficiency with the conventional absorption heat pump, it is possible to cope with it appropriately by switching to boiler operation.

Next, a modification of the second embodiment will be described with reference to FIGS. 10 and 11.
10 and 11, illustration of the fan F2 (see FIG. 6) in the evaporator 2 is omitted.
FIG. 10 shows a first modification of the second embodiment, and FIG. 11 shows a second modification of the second embodiment.

In FIG. 10, an opening / closing valve V <b> 2 is interposed in a line L <b> 3 where the refrigerant vapor regenerated by the regenerator 1 flows into the condenser 4. The other points are the same as in FIG.
When the valve V1 is opened and the boiler operation is performed, if the on-off valve V2 is closed, the refrigerant vapor regenerated by the regenerator 1 is reliably prevented from flowing into the condenser 4.
In the control, in FIGS. 8 and 9, the on-off valve V2 is closed when the on-off valve V1 is opened, and the on-off valve V2 is opened when the on-off valve V1 is closed.
Other configurations and operational effects in the first modification of FIG. 10 are the same as those shown in FIGS.

In the second modification of the second embodiment shown in FIG. 11, a line L30 through which liquid phase refrigerant flows communicates the evaporator 2 and the regenerator 1, and an open / close valve V2 is interposed in the line L30. .
Although not clearly shown, the evaporator 2 is arranged vertically above the regenerator 1, and when the on-off valve V2 is opened, the liquid-phase refrigerant in the evaporator 2 falls due to gravity and the regenerator. 1 is configured to flow into 1.

  In the second embodiment of FIG. 6, when the refrigerant vapor regenerated by the regenerator 1 flows through the line L <b> 3 and flows into the condenser 4 to be condensed, the liquid-phase refrigerant is stored in the evaporator 2. We are concerned about the problem. However, according to the second modification of FIG. 11, if the on-off valve V2 of the line L30 is opened during the boiler operation, even if the refrigerant is condensed in the condenser 4 during the boiler operation, the liquid-phase refrigerant is discharged from the evaporator 2 to the line. It flows into the regenerator 1 via L30. Therefore, the liquid phase refrigerant is not stored in the evaporator 2.

In the control, in FIGS. 8 and 9, the on-off valve V2 is also opened when the on-off valve V1 is opened, and the on-off valve V2 is also closed when the on-off valve V1 is closed.
Other configurations and operational effects in the second modified example of FIG. 11 are the same as those shown in FIGS.

It should be noted that the illustrated embodiment is merely an example, and is not a description to limit the technical scope of the present invention.
For example, the first embodiment and the second embodiment can be arbitrarily combined.
In the illustrated embodiment, the case where water is used as the absorbent and ammonia is used as the refrigerant is described. However, if the absorbent and the refrigerant do not cause crystallization, the combination of water and ammonia is used. It is not limited. If water and ammonia are not used as the absorbent and the refrigerant, the rectifier 11 can be omitted.

The block diagram which showed the whole structure of 1st Embodiment of this invention. The flowchart which shows an example of the control in 1st Embodiment. The flowchart which shows the other example of control in 1st Embodiment. The block diagram which shows the 1st modification of 1st Embodiment. The block diagram which shows the 2nd modification of 1st Embodiment. The block diagram which showed the whole structure of 2nd Embodiment of this invention. The pressure-temperature diagram which shows the cycle of 2nd Embodiment. The flowchart which shows an example of the control in 2nd Embodiment. The flowchart which shows the other example of control in 2nd Embodiment. The block diagram which shows the 1st modification of 2nd Embodiment. The block diagram which shows the 2nd modification of 2nd Embodiment. The block diagram which showed the whole structure of the absorption heat pump of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Regenerator 2 ... Evaporator 3 ... Absorber 4 ... Condenser 5 ... Circulation pump 6 ... Solution heat exchanger 11 ... Rectifier L1, L2 ... Absorption solution line Lf ... Fuel gas supply lines Lw, Lw1, Lw2 ... Cooling water lines V1, V2 ... Open / close valve V3 ... Three-way valve F2 ... Fan

Claims (6)

A regenerator (1) that is supplied with fuel by a fuel supply line (Lf) and heated, an evaporator (2) that takes in heat energy (Q _L ) from outside the system and evaporates the refrigerant, and a liquid phase absorbent Comprises an absorber (3) that absorbs the refrigerant and a condenser (4) that condenses the refrigerant vapor, and a cooling water line (Lw) cools the absorber (3) and the condenser (4). In the absorption heat pump, the absorber (3) and the regenerator (1) are connected by the absorption solution line (L1, L2) interposed in the circulation pump (5), and the cooling water line (Lw) is connected to the three-way Branched into a first line (Lw1) via a condenser (4) and an absorber (3) and a second line (Lw2) via a regenerator (1) with a valve (V3) interposed The refrigerant vapor generated in the regenerator (1) flows into the condenser (4). The first on-off valve (V1) is provided at (L3), the second on-off valve (V2) is provided at the absorbent solution line (L1, L2) through which the absorbent solution circulates, and the temperature (Tg) of the regenerator (1) ) Or a signal from the regenerator measuring means (STg) for measuring pressure, the three-way valve (V3), the first on-off valve (V1), the second on-off valve (V2), and the circulation pump (5) The control unit (200) is configured to control the first on-off valve (200) when the boiler operation mode is instructed by the operator after receiving the signal from the regenerator measuring means (STg). V1) and the second on-off valve (V2) are closed, the three-way valve (V3) is communicated with the cooling water line (Lw) on the second line (Lw2) side, and the circulation pump (5) is further stopped. When the heat pump operation mode is instructed The first on-off valve (V1) and the second on-off valve (V2) are opened so that the three-way valve (V3) communicates with the cooling water line (Lw) on the first line (Lw1) side, and the circulation pump (5) is driven, and then it is determined whether or not the temperature (Tg) or pressure of the regenerator (1) is equal to or lower than a set value. If it exceeds, a boiler operation is performed, and if it is less, a heat pump operation is performed. Absorption heat pump characterized by having a function. A regenerator (1) that is supplied with fuel by a fuel supply line (Lf) and heated, an evaporator (2) that takes in heat energy (Q _L ) from outside the system and evaporates the refrigerant, and a liquid phase absorbent Comprises an absorber (3) that absorbs the refrigerant and a condenser (4) that condenses the refrigerant vapor, and a cooling water line (Lw) cools the absorber (3) and the condenser (4). In the absorption heat pump, the absorber (3) and the regenerator (1) are connected by the absorption solution line (L1, L2) interposed in the circulation pump (5), and the cooling water line (Lw) is connected to the three-way Branched into a first line (Lw1) via a condenser (4) and an absorber (3) and a second line (Lw2) via a regenerator (1) with a valve (V3) interposed The refrigerant vapor generated in the regenerator (1) flows into the condenser (4). The first on-off valve (V1) is provided at (L3), the second on-off valve (V2) is provided at the absorbent solution line (L1, L2) through which the absorbent solution circulates, and the temperature (Tg) of the regenerator (1) ) Or regenerator measuring means (STg) for measuring pressure and first temperature measuring means for measuring hot water supply temperature (T1) downstream of the first and second cooling water (Lw1, Lw2) junction (GP). Signals from (ST1), the second temperature measuring means (ST2) for measuring the cooling water temperature (T2), and the third temperature measuring means (ST3) for measuring the unused energy temperature introduced from the outside. A control unit (200) for controlling the three-way valve (V3), the first on-off valve (V1), the second on-off valve (V2) and the circulation pump (5) is provided, and the control unit (200) Is the regenerator measuring means (STg) and the first temperature. After receiving signals from the measuring means (ST1) to the third temperature measuring means (ST3), when the operator instructs the boiler operation mode, the first on-off valve (V1) and the second on-off valve ( When V2) is closed, the three-way valve (V3) is connected to the cooling water line (Lw) on the second line (Lw2) side, the circulation pump (5) is stopped, and the heat pump operation mode is instructed. The first on-off valve (V1) and the second on-off valve (V2) are opened, the three-way valve (V3) is communicated with the cooling water line (Lw) on the first line (Lw1) side, and the circulation pump (5) is driven, and the region of the heat pump operation and the region of the boiler operation are determined by signals from the regenerator measuring means (STg) and the first temperature measuring means (ST1) to the third temperature measuring means (ST3). Control function ( The absorption heat pump has a function of performing boiler operation if the control function (F) is within the boiler operation region for a certain period of time, and performing heat pump operation if the control function (F) is within the heat pump operation region. . The regenerator (1) is provided with a rectifier (11) for removing the vaporization heat of the vapor-phase absorbent and separating the vapor-phase absorbent from the refrigerant vapor, and the cooling water line (Lw) is connected to the rectifier (11). ) And an absorption solution line (L1) from the circulation pump (5) through the rectifier (11). The regenerator (1) is provided with a rectifier (11) that removes the vaporization heat of the gas phase absorbent from the refrigerant vapor and separates the gas phase absorbent from the refrigerant vapor, and an exhaust gas line of exhaust gas burned in the regenerator (1) ( Lg), a latent heat recovery heat exchanger (7) for exchanging heat with the exhaust gas line (Lg) is provided in the cooling water line (Lw), and the cooling water line (Lw) passes through the rectifier (11). The absorption heat pump according to claim 1 or 2. A regenerator (1) that is supplied with fuel by a fuel supply line (Lf) and heated, an evaporator (2) that takes in heat energy (Q _L ) from outside the system and evaporates the refrigerant, and a liquid phase absorbent Comprises an absorber (3) that absorbs the refrigerant and a condenser (4) that condenses the refrigerant vapor, and a cooling water line (Lw) cools the absorber (3) and the condenser (4). In the absorption heat pump, the regenerator (1) is provided with a rectifier (11) for removing the vaporization heat of the vapor-phase absorbent and separating the vapor-phase absorbent from the refrigerant vapor, and the cooling water line (Lw) An absorption solution line (L1) that passes through the condenser (4) and the absorber (3) and is connected to the absorber (3) via a circulation pump (5) passes through the rectifier (11). Connected to the absorber (3) by another absorbent solution line (L2) via the regenerator (1) The refrigerant vapor generated in the regenerator (1) is provided with another line (L20) through which the refrigerant vapor flows into the absorber (3), and the open / close valve (V1) is provided in the other line (L20). 1) A regenerator measuring means (STg) for measuring the temperature (Tg) or pressure is provided, and a control unit (200) for controlling the on-off valve (V1) by a signal from the regenerator measuring means (STg) is provided. The control unit (200) first measures the temperature (Tg) or pressure of the regenerator (1) by the regenerator measuring means (STg), and when the boiler operation mode is instructed by the operator, the on-off valve (V1 When the heat pump operation mode is instructed, the on-off valve (V1) is closed, and it is determined whether the temperature (Tg) or pressure of the regenerator (1) is below the set value. Heat pong Absorption heat pump characterized by having a function of performing boiler operation if the operation is exceeded. A regenerator (1) that is supplied with fuel by a fuel supply line (Lf) and heated, an evaporator (2) that takes in heat energy (Q _L ) from outside the system and evaporates the refrigerant, and a liquid phase absorbent Comprises an absorber (3) that absorbs the refrigerant and a condenser (4) that condenses the refrigerant vapor, and a cooling water line (Lw) cools the absorber (3) and the condenser (4). In the absorption heat pump, the regenerator (1) is provided with a rectifier (11) for removing the vaporization heat of the vapor-phase absorbent and separating the vapor-phase absorbent from the refrigerant vapor, and the cooling water line (Lw) An absorption solution line (L1) that passes through the condenser (4) and the absorber (3) and is connected to the absorber (3) via a circulation pump (5) passes through the rectifier (11). Connected to the absorber (3) by another absorbent solution line (L2) via the regenerator (1) The refrigerant vapor generated in the regenerator (1) is provided with another line (L20) through which the refrigerant vapor flows into the absorber (3), and the open / close valve (V1) is provided in the other line (L20). 1) Regenerator measuring means (STg) for measuring temperature (Tg) or pressure, first temperature measuring means (ST1) for measuring the outlet temperature of the cooling water line (Lw), and second for measuring the inlet temperature thereof. Temperature measuring means (ST2) and third temperature measuring means (ST3) for measuring the temperature of unused energy introduced from the outside are provided, and the regenerator measuring means (STg) and temperature measuring means (ST1 to ST3). ) Is provided with a control unit (200) for controlling the on-off valve (V1) by a signal from the control unit (200). The control unit (200) includes a regenerator measuring means (STg) and first temperature measuring means (ST1) to third Temperature measurement After receiving the signal from the means (ST3), when the boiler operation mode is instructed by the operator, the on-off valve (V1) is opened, and when the heat pump operation mode is instructed, the on-off valve (V1) is closed, and A control function (F) indicating the heat pump operation area and the boiler operation area is calculated by signals from the regenerator measurement means (STg) and the first temperature measurement means (ST1) to the third temperature measurement means (ST3). An absorption heat pump characterized by having a function of performing a boiler operation if the control function (F) is within a boiler operation region for a certain period of time and performing a heat pump operation if the control function (F) is within a heat pump operation region.

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