JPH0355740B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an absorption heat pump.

In conventional absorption heat pumps that use single-effect absorption refrigerators, the heat input Q1 = 1.0
When, heat source water heat input Q2 = 0.58, heat radiation loss Q3 = 0.14, hot water heat output Q4 = about 1.44, and the coefficient of performance was about 1.4 to 1.6. On the other hand, in the case of a dual-effect absorption chiller, when the heat input Q1 = 1.0, the heat source water heat input Q2 =
1.04, Heat radiation loss Q3 = 0.14, Heat input/output Q4 = 1.9
The coefficient of performance is approximately 1.9 to 2.1.
Therefore, the coefficient of performance of the dual-effect absorption heat pump is better. However, while single-effect absorption heat pumps can extract hot water of around 90℃, current dual-effect absorption heat pumps can
Due to pressure limitations within the high temperature regenerator, e.g. 40-45
Only hot water around ℃ can be extracted. In reality, 40~
Hot water at a temperature higher than 45°C is often required.
Current dual-effect absorption heat pumps are often unable to meet these demands.

Furthermore, in conventional dual-effect absorption heat pumps, when the temperature of the fluid to be heated, such as water supplied to the condenser 6, rises, the pressure and temperature of the high-temperature regenerator rise, causing the high-temperature regenerator to malfunction. The big problem is that it's starting to stop working.

The object of the present invention is to be able to take out relatively high-temperature fluid, and to keep the pressure and temperature of the high-temperature regenerator stable even if the temperature of the fluid such as water to be heated rises. An object of the present invention is to provide an absorption heat pump that can obtain fluid at a temperature of

In the present invention, a first coil 12 is provided in the condenser 6 of a double-effect absorption refrigerator, and a second coil 12 is provided in the absorber 3.
A coil 13 is provided, one end of the first coil 12 is connected to a supply pipe 15 to a source 16 of the fluid to be heated.
The other end of the first coil 12 and one end of the second coil 13 are connected via a connecting pipe 17, and the other end of the second coil 13 has a lead-out pipe 1.
8 is connected to the evaporator 2, and a third coil 19 connected to a relatively high-temperature heat source is provided in the evaporator 2. A heat exchanger 24 is provided, and this heat exchanger 24 is installed in the middle of a bypass pipe 25 that bypasses the first coil 12 and connects the supply pipe 15 and the connecting pipe 17, and the bypass pipe 25 has a fluid flow rate. This is an absorption heat pump characterized by being equipped with a bypass valve 26 for regulation.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram of an embodiment of the present invention.
The absorption heat pump according to the invention comprises a dual-effect absorption refrigerator 1. The dual-effect absorption refrigerator 1 includes an evaporator 2, an absorber 3, a high-temperature regenerator 4, a low-temperature regenerator 5, a condenser 6, a high-temperature heat exchanger 7, a low-temperature heat exchanger 8, and the like. Fuel, such as city gas, is supplied to the high temperature regenerator 4 via a pipe 10 equipped with a flow rate regulating valve 9, and its combustion heat is used as a drive heat source for the dual-effect absorption refrigerator 1. In addition,
Instead of burning fuel, high-temperature steam or the like may be supplied. In the evaporator 2, heat is pumped up from a relatively high-temperature heat source 11, and is radiated to a fluid to be heated, such as water, in a condenser 6 and an absorber 3, thereby achieving heat pump operation.

According to the invention, the first coil 1 is disposed in the condenser 6.
2 is provided, and a second coil 13 is provided within the absorber 3. One end of the first coil 12 is connected to the pump 1
4 is connected to a source 16 of the fluid to be heated, for example water. The other end of the first coil 12 is connected to one end of the second coil 13 via a connecting tube 17. A lead-out pipe 18 is connected to the other end of the second coil 13.
The heated hot water is extracted from. Also evaporator 2
A third coil 19 is provided inside, and a heat source 11 is connected to one end of the third coil 19 via a heat supply pipe 21 provided with a pump 20. Third
A discharge pipe 22 is connected to the other end of the coil 19 .

In the above configuration, when there is a large amount of water flowing from the bypass valve 26, the refrigerant vapor (steam) from the pipe line 23 is condensed and enters the condenser 6 as a refrigerant liquid;
When the flow of water from the bypass valve 26 is zero or small, the steam generated in the high temperature regenerator 4 is guided from the pipe line 23, and the intermediate steam that is guided from the high temperature regenerator 4 to the low temperature regenerator 5 via the heat exchanger 7. Heat exchange with concentrated solution,
The water vapor evaporated from the intermediate concentration solution is cooled in the condenser 6 to become a refrigerant liquid, and the concentrated solution that has released water vapor is led to the absorber 3 via the heat exchanger 8, which absorbs the evaporated refrigerant vapor in the evaporator 2. do.

A hot water heat exchanger 24 is provided in the middle of a pipe line 23 that guides refrigerant vapor from the high temperature regenerator 4 to the low temperature regenerator 5. The hot water exchanger 24 is arranged in the middle of a bypass pipe 25 that bypasses the first coil 12 and connects the supply pipe 15 and the connecting pipe 17 in the middle.
A bypass valve 26 is provided in the bypass pipe 25 on the upstream side of the hot water heat exchanger 24 . After passing through the high-temperature regenerator 4, the pipe 23 passes through the low-temperature regenerator 5, and the high-pressure steam condenses in the coil within the low-temperature regenerator 5.
The condensed refrigerant is led to the condenser 6.

In the absorption heat pump configured in this way, the heat source 11 generates a relatively high temperature, e.g.
When hot water at 0.degree. C. is supplied to the third coil 19, the refrigerant in the evaporator 2 evaporates. The evaporated refrigerant is absorbed by an absorbent in the absorber 3, and at this time releases high-temperature absorbed heat. That is, the water supplied from the water supply source 16 is given condensation heat of the refrigerant in the first coil 12, and further heated to a higher temperature in the second coil 13 by the absorbed heat. Therefore, it is possible to take out hot water from the outlet pipe 18 at a higher temperature than before, for example, 50 to 60°C.

An example of the cycle of such an absorption heat pump is shown in a Duehring diagram as shown in FIG. 2 when the refrigerant is lithium bromide and the absorbent is water. In FIG. 2, t1 is the refrigerant evaporation temperature, t2 is the outlet temperature of the third coil 19, t3 is the inlet temperature of the first coil 12, and t
4 is the condensation temperature of the refrigerant, and t5 is the second coil 1
3, and t6 is the absorption temperature.

Here, when the temperature of the water supplied from the water supply source 16 to the first coil 12 rises, the high temperature regenerator 4
The pressure and temperature of the device will increase and it will no longer function properly. Therefore, when the temperature of the water supplied to the first coil 12 exceeds a predetermined temperature, the bypass valve 26 is opened, and all or part of the water is guided to the hot water heat exchanger 24 to vaporize the refrigerant. After exchanging heat with the water, it is introduced into the absorber 3. This prevents the pressure and temperature inside the high temperature regenerator 4 from rising abnormally. Moreover, this cycle is a single-effect cycle, and can fully function as a heat pump. Therefore, by controlling the bypass valve 26 according to load fluctuations, it is possible to always supply hot water at a stable temperature as a heat pump. To describe the use of this single-effect cycle, when the bypass valve 26 is opened, the supply source 1
6 exchanges heat with high pressure steam led from the high temperature regenerator 4 in the hot water heat exchanger 24, and the high pressure steam releases heat to water and condenses. The condensed water is led to the condenser 6 via the pipe 23. That is, in this case, the hot water heat exchanger 24 functions as a condenser, and the low temperature regenerator 5 ceases to function. Therefore, it becomes a single-effect heat pump cycle.

Note that as the detection unit for controlling the bypass valve 26, (1) the inlet temperature of the first coil 12, (2) the solution temperature of the high temperature regenerator 4, and (3) the condenser temperature may be selected. Further, the bypass valve 26 may be controlled on and off, or may be controlled proportionally.

In yet another embodiment of the invention, fluids other than water may be heated and removed.

As described above, according to the present invention, the fluid to be heated is heated in the first coil in the condenser and then further heated in the second coil in the absorber, resulting in excellent performance as a dual-effect heat pump. It becomes possible to obtain a relatively high temperature fluid while maintaining the coefficient.

In particular, according to the present invention, a heat exchanger 24 is provided in the middle of the pipe line 23 that leads refrigerant vapor from the high temperature regenerator 4 to the low temperature regenerator 5, and this heat exchanger 24 bypasses the first coil 12. From supply pipe 15 to connecting pipe 17
The bypass pipe 25 is inserted in the middle of a bypass pipe 25 that guides a fluid such as water to be heated through the
is equipped with a bypass valve 26 for flow rate adjustment, so when the temperature of the fluid such as water to be heated rises, the opening degree of the bypass valve 26 is increased, and thereby the high temperature regenerator 4 It is possible to prevent the internal pressure and temperature from rising abnormally. In this way, regardless of the temperature of the fluid to be heated, fluid at a stable temperature can always be obtained, and the operation of the heat pump is stabilized.

[Brief explanation of drawings]

FIG. 1 is a system diagram of an embodiment of the present invention, and FIG. 2 is a Dueling diagram showing a heat pump cycle. 1...Double effect absorption refrigerator, 2...Evaporator,
3... Absorber, 4... High temperature regenerator, 5... Low temperature regenerator, 6... Condenser, 11... Heat source, 12... First coil, 13... Second coil, 15... Supply pipe , 16... supply source, 17... connecting pipe, 18...
Lead-out pipe, 19...Third coil, 23...Pipeline, 2
4...Hot water heat exchanger, 25...Bypass pipe, 26
...Bypass valve.

Claims (1)

[Claims] 1 A first coil 12 is provided in the condenser 6 of the double-effect absorption refrigerator, and a second coil 1 is provided in the absorber 3.
3, one end of the first coil 12 is connected to a supply source 16 of the fluid to be heated via a supply pipe 15, and the other end of the first coil 12 and one end of the second coil 13 are connected. A lead-out pipe 18 is connected to the other end of the second coil 13, and a third coil 19 connected to a relatively high-temperature heat source is provided in the evaporator 2. A heat exchanger 24 is provided in the middle of a pipe line 23 that leads refrigerant vapor from the regenerator 4 to the low-temperature regenerator 5, and this heat exchanger 24 bypasses the first coil 12 and connects the supply pipe 15 and the connecting pipe 17. Bypass pipe 25 connecting
An absorption heat pump characterized in that the bypass pipe 25 is provided with a bypass valve 26 that is installed in the middle of the bypass pipe 25 to adjust the fluid flow rate.