JPH0473555A - Absorption type heat pump - Google Patents

Abstract

PURPOSE:To provide an absorption type heat pump capable of performing an efficient utilization of heating calorie and having no pressure loss in a cold water system by a method wherein an evaporator is provided with a heat conducting part where more than two kinds of external fluids can flow, at least one kinds of external fluid passing through the heat conducting part is applied as cold water and the other fluid is applied as a low temperature heat source fluid. CONSTITUTION:A solution cycle is carried out such that solution outputted from an absorption device A is flowed through a heated side of a heat exchanger H, thereafter the solution is fed into a generator G, the solution condensed by a heating source 27 is passed through the heating side of the heat exchanger H from a pipe 3, and then the solution is fed from the pipe 4 into the absorption device A, fed from the pipe 4 into the absorption device A and circulated. In turn, a refrigerant cycle is carried out such that refrigerant vapor generated at the generator G is condensed by a condensor C and fed from a pipe 11 to an evaporator E. The evaporator E is provided with a heat conducting pipe 21 through which cold water 25 passes and a heat conducting pipe 22 through which a low temperature heating source fluid 26 passes. Sprays 23 and 24 are mounted above heat conducting pipes 21 and 22. Refrigerant within the evaporator E is sprayed by sprays 23 and 24 and circulated. A pipe 13 for use in spraying refrigerant to the heat conducting pipe 22 is provided with a valve 20 so as to adjust the amount of spray to enable control of reduction in cold water temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an absorption heat pump, and particularly to an absorption heat pump in which a condenser is provided with a plurality of heat transfer parts.

[Conventional technology]

Conventionally, absorption heat pumps use an evaporator to cool cold water using low temperature, and then raise the temperature of this heat to obtain hot water.
If the cold water load and hot water load match the production capacity of the human pump, the efficiency is high and the operation is desirable.

There are two ways to deal with cases where the heat pump's production capabilities do not match and the hot water load is large.

(a) Mixing refrigerant from the refrigerant system into the solution system, reducing chilled water efficiency. In this method, as shown in FIG. 3, the refrigerant condensed in the condenser is returned to the generator, but it is necessary to increase the heat source to the generator due to the large hot water load.

) Back up with another low heat source and increase the chilled water load. In this method, the chilled water efficiency hardly changes, and when the hot water load is large, the increase in the heat source to the generator is reduced by the amount of chilled water efficiency.

As the backup method (b), conventionally, as shown in FIG. 4, a method has been used in which the temperature of the cold water fed to the evaporator is increased. However, this method indirectly deals with the rise in refrigerant temperature, and there is a temperature loss. Moreover, the pressure loss in the cold water system also increases.

[Problem to be solved by the invention]

An object of the present invention is to provide an absorption heat pump which does not have the above-mentioned drawbacks, can effectively utilize the amount of heat, and has no pressure loss in the cold water system by employing the above-mentioned backup method.

[A means of saving to solve problems]

In order to achieve the above object, the present invention consists of a generator, a condenser, an absorber, an evaporator, a heat exchanger, and piping connecting them.The external fluid passing through the evaporator is used as a low-temperature heat source, and this heat is In a heat pump that raises the temperature and extracts hot water from an absorber and/or condenser, the evaporator is provided with a heat transfer section through which two or more types of external fluids can flow, and at least one type of external fluid passes through the heat transfer section. The absorption heat pump is characterized in that the external fluid is cold water and the other fluid is a low-temperature heat source fluid.

In the absorption heat pump, the low-temperature heat source fluid includes river water, sewage, etc., and when backup is performed using this fluid, if the backup is applied too much, the temperature of the cold water will rise too much. Therefore, in the present invention, when the hot water load is large,
Based on the hot water load (or hot water temperature), the amount of driving heat source (the amount of heat to the generator) is adjusted, and the amount of heat from the low temperature heat source is adjusted so as to control the chilled water output or chilled water temperature. As a method of adjusting the amount of heat, it is easy to adjust the amount of refrigerant sprayed to the low-temperature heat source.

That is, in the present invention, the evaporator has means for supplying refrigerant to the heat transfer section through which the low-temperature heat source fluid passes, and the supply means has means for adjusting the amount of supply, and the supply means has means for adjusting the amount of supply, and the evaporator has a means for adjusting the amount of supply, and the evaporator has means for supplying refrigerant to the heat transfer section through which the low-temperature heat source fluid passes. In particular, it is preferable that the refrigerant supply amount be adjusted.

The absorption heat pump of the present invention can be applied to all types of heat pumps, such as multi-effect absorption heat pumps such as dual-effect absorption heat pumps, dual-effect absorption heat pumps with two-stage temperature rise, and the like.

In addition, if the cold and hot water loads do not match, and the hot water load is small, this can be handled by discharging the excess hot water output from the condenser.

[For production]

In a heat pump that uses an evaporator to cool cold water for a purpose (using low temperature) and heats up the heat to produce hot water, the efficiency is high if the cold water load and hot water load match the heat pump's output. High and desirable driving.

QG2 generator calorific value, QE: Evaporator calorific value, Q^: Absorber calorific value, Qc: Condenser calorific value, Qw: Cooling water calorific value (QA + QC
) If ΔQ is the amount of change, then when the heat quantity is balanced, Q c + Q p = = Q A + Q c The cold water efficiency is COP H = Q E / Q c When the hot water load is large (the hot water load is In order to deal with the problem (ΔQ, large), the present invention increases the chilled water load. That is,
Backed up with another low heat source. In this case COP,
remains almost unchanged.

The heat balance is QG ten △qc+Qp, +△QE=QA+Qo+ΔQ.

COP x”Q r=/Q c= (Q E+Δ
Q, )/(QG+ΔQG) To increase ΔQ, it is sufficient to increase ΔQc−ΔQ,/(1+C0PE).

〔Example〕

Hereinafter, the present invention will be specifically explained using drawings, but the present invention is not limited thereto.

Example 1 FIG. 1 shows a system diagram of an absorption heat pump that is an example of the present invention.

In FIG. 1, G is a generator, C is a condenser, A is an absorber, E is an evaporator, and H is a heat exchanger, and each device is connected by piping.

In FIG. 1, the solution cycle is such that the solution leaving the absorber A is passed through a square tube 1 to the heated side of a heat exchanger H, and then introduced into a generator G through a tube 2. In the generator G, the solution concentrated in the heat source 27 passes through the heating side of the heat exchanger H through the tube 3 and is introduced into the absorber A through the tube 4 for circulation.

On the other hand, in the refrigerant cycle, refrigerant vapor generated in a generator G is condensed in a condenser C and introduced into an evaporator E through a pipe 11. The evaporator E is provided with a heat exchanger tube 21 through which cold water 25 passes and a heat exchanger tube 22 through which a low-temperature heat source fluid 26 passes, and sprays 23 and 24 are installed above the heat exchanger tubes 21 and 22. . Then, the refrigerant in the evaporator E is branched from the pipe 12 into the pipes 13 and 14, and the sprays 23 and 2
4 is sprayed and circulated.

In addition, the tube 1 sprayed onto the heat transfer tube 22 for low-temperature heat source fluid
3 is provided with a valve 20 so that the amount of spray can be adjusted. By doing so, when the hot water load is large, it is possible to control the decrease in the cold water temperature (chilled water output) by adjusting the amount of the drive heat source.

Embodiment 2 FIG. 2 shows a system diagram of an absorption heat pump which is another example of the present invention.

FIG. 2 shows an example in which the present invention is applied to a one- and two-stage temperature-raising, dual-effect absorption heat pump.

In Figure 2, GH is a high temperature generator, GL is a low temperature generator, CL is a low temperature condenser, AH is a high temperature absorber, AL is a low temperature absorber, EH is a high temperature evaporator, EL is a low temperature evaporator, and HH is a high temperature The solution heat exchanger, HM indicates a medium temperature solution heat exchanger, and HL indicates a low temperature solution heat exchanger. Each device is connected with piping.

In FIG. 2, the solution cycle is as follows.

(a) The solution exiting the low-temperature absorber AL is first passed through tube 1 to the heated side of the low-temperature solution heat exchanger HL, then guided to the heated side of the medium-temperature solution heat exchanger HM, and then partially passed through tube 2. The solution is branched to the low-temperature generator GL through tube 3, and the remainder is led to the high-temperature generator GH from tube 4 via the heated side of the high-temperature solution heat exchanger HH, and (b) exits the high-temperature generator GH. The solution is first passed through tube 6 to the heating side of the hot solution heat exchanger HH, and then the solution from the low temperature generator GL is combined in tubes 5 to 7 and led to the heating side of the medium temperature solution heat exchanger HM. Thereafter, the solution is guided from tube 8 to high temperature absorber AH, and (C) The solution leaving high temperature absorber AH passes through tube 9, passes through the heating side of low temperature solution heat exchanger HL, and is guided from tube 10 to low temperature absorber AL. , forming a cycle.

On the other hand, the refrigerant cycle is generated by the high temperature generator GH and is generated by the pipe 11.
refrigerant condensed through the heating side of the low temperature generator GL,
and the refrigerant condensed in the low temperature condenser CL through the pipe 12,
First, the refrigerant is led to the high temperature evaporator EH, and the refrigerant that has overflowed the high temperature evaporator EH is led from the pipe 14 to the low temperature evaporator EL. In the high temperature evaporator EH and the low temperature evaporator EL, the refrigerant is circulated through pipes 13 and 15. Further, the high temperature evaporator EH and the low temperature absorber AL are connected by a pipe 28 and a pipe 29, and exchange heat of evaporation and absorption heat.

In the low temperature evaporator EL, there are provided a heat transfer tube 21 through which cold water 25 passes and a heat transfer tube 22 through which a low temperature heat source fluid 26 passes.
and 24 are installed, and the refrigerant in the low temperature evaporator EL is branched from the pipe 15 into a pipe 16 and a pipe 17, and a spray 23 is installed.
and sprayed with 24.

In addition, the tube 1 sprayed onto the heat transfer tube 22 for low-temperature heat source fluid
7 is provided with a valve 20 so that the amount of spray can be adjusted.

〔Effect of the invention〕

According to the present invention, by having the above configuration,
Efficient operation is possible when there is a large hot water load, and the cold water temperature can be easily adjusted.

Furthermore, as a backup method, the low heat source temperature can be used up to almost the same temperature as the chilled water, and there is no increase in pressure loss in the chilled water system.

[Brief explanation of drawings]

Fig. 1 is a system diagram of an absorption heat pump showing an example of the present invention, Fig. 2 is a system diagram of a double heating, dual effect absorption heat pump which is another example of the invention, and Figs. FIG. 4 is a partial system diagram of an absorption heat pump showing a conventional system. G... Generator, C... Condenser, A... Absorber, E
...evaporator, H...heat exchanger, GH...high temperature generator, GL...low temperature generator, CL...low temperature condenser, A
H...High temperature absorber, AL...Low temperature absorber, EH-・
・High temperature evaporator, EL...Low temperature evaporator, HH...High temperature solution heat exchanger, HM...Medium temperature solution heat exchanger, HL...
- Low temperature solution heat exchanger, 1-10... Solution cycle piping, 11-17-... Refrigerant cycle piping, 20... Valve, 21... Cold water heat transfer tube, 22. Heat transfer tube for low temperature heat source fluid, 23.24...Spray 25.
...Cold water, 26.Low-temperature heat source fluid, 27.Driving heat source, 28.29.Connection piping patent applicant Keito Yoshimine, representative of Ebara Corporation.
Pine 1) Large Figure 1

Claims (1)

[Claims] 1. It is composed of a generator, a condenser, an absorber, an evaporator, a heat exchanger, and piping that connects them, and uses the external fluid passing through the evaporator as a low-temperature heat source and raises the temperature of this heat. In a heat pump that extracts hot water from an absorber and/or a condenser, the evaporator is provided with a heat transfer part through which two or more types of external fluids can flow, and at least one type of external fluid passing through the heat transfer part is An absorption heat pump characterized in that the cold water is cold water and the other fluid is a low temperature heat source fluid. 2. The evaporator has means for supplying refrigerant to the heat transfer section through which the low-temperature heat source fluid passes, and the supply means has means for adjusting the supply amount, and based on the chilled water load or the chilled water temperature, The absorption heat pump according to claim 1, characterized in that the absorption heat pump is configured to adjust the amount of refrigerant supplied.