JPH08178455A - Absorption type cold / hot water simultaneous supply type heat pump - Google Patents

Abstract

(57) [Summary] [Purpose] To achieve high-concentration operation of the absorbent and to downsize the device. [Structure] A heat source fluid for heating, for example, hot water that has flowed through a cooling water pipe 17 to radiate heat by work to a heating load and has returned to a temperature of, for example, 40 ° C., is condensed in a condenser 4 and an absorber 7.
In order to cool the inside of the vessel, cool the inside of the vessel, raise the temperature of the hot water itself, and connect it to the pipe so that it does not use the conventional simple LiBr aqueous solution as the absorbing solution, but raise the crystallization limit temperature. Neutral salts capable of producing, for example LiI, LiC
l and LiNO ₃ are added to LiBr100 at 7
An aqueous solution added at a ratio (molar ratio) of 5, 41, 25 is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption heat pump, and more particularly, it is possible to supply a cold heat source fluid (for example, cold water) and a hot heat source fluid (for example, hot water) simultaneously for air conditioning and hot water supply. The present invention relates to an absorption type cold / hot water simultaneous supply type heat pump.

[0002]

2. Description of the Related Art As an apparatus of this type, a double-effect absorption heat pump having a lithium bromide aqueous solution as shown in FIG. In the figure, 1 is equipped with a combustion device 2 for gas, kerosene, etc., and a high-temperature regenerator for generating a refrigerant (water in this case) vapor by heating a dilute liquid and concentrating it into an intermediate liquid, 3 are from this regenerator. Low-temperature regenerator 4 that heats the intermediate liquid with refrigerant vapor to make it a concentrated liquid
A condenser for cooling and condensing the refrigerant vapor from 3 and 5 an evaporator for evaporating the refrigerant liquid from the refrigerant distributor 6 by spraying, dropping, etc. 7 a low temperature regenerator for the refrigerant vapor from this evaporator Absorbers for absorbing the concentrated liquid from 3 to maintain a low pressure inside the container, 8 and 9 are low temperature and high temperature heat exchangers, which have an intermediate liquid pipe 10, a concentrated liquid pipe 11 and an absorbent liquid pump 12. The liquid pipe 13, the refrigerant pipe 14, and the refrigerant liquid pipe 15 are connected to form a circulation cycle of the refrigerant and the absorbing liquid.

[0003] Then, cold water for cooling is provided through a cold water pipe 16 which is provided through the inside of the evaporator 6, and heating is provided through a cooling water pipe 17 which is provided through the inside of the absorber 7 and the condenser 4. Hot water for hot water and hot water can be supplied at the same time.

[0004]

However, in the conventional absorption heat pump using the aqueous solution of lithium bromide having the above-mentioned constitution, the hot water for heating or hot water supply is produced at the same time as the production of cold water for air conditioning (about 7 ° C.). When manufacturing (about 45 ° C), it is difficult to raise the concentration extremely because of the problem of crystallization of the absorbing liquid, and therefore it is necessary to select a large heat transfer area for the equipment, resulting in high cost. There was a problem that was said to be, and the solution to this point was a problem.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, in which an absorber, an evaporator, a condenser, a regenerator, a heat exchanger, an absorption liquid pump, and the like are piped. A water-lithium bromide solution containing a plurality of neutral salts that raises the crystallization limit temperature is used as an absorption liquid, and a cold heat source fluid is supplied from an evaporator. And the absorption-type cold / hot-water simultaneous supply heat pump of the first configuration capable of simultaneously supplying the heat source fluid from the absorber / condenser,

In the absorption-type cold / hot water simultaneous supply type heat pump of the first structure, the absorption-type cold / hot water of the second structure is provided so that the heat source fluid is heat-exchanged and supplied in the order of the condenser and the absorber. Simultaneous supply heat pump,

In the absorption-type cold / hot water simultaneous supply heat pump of the first construction, about half of the heat source fluid exchanges heat with the absorber to bypass the condenser, and about half of the remaining heat exchanges with the condenser. The absorption type cold / hot water simultaneous supply heat pump of the third configuration provided so as to be supplied by bypassing the absorber.

[0008]

In the absorption-type cold / hot-water simultaneous supply type heat pump of the first structure, since a plurality of neutral salts are added and the crystallization limit temperature is higher than that of the lithium bromide aqueous solution, a high concentration is obtained under atmospheric pressure. It can be operated, and therefore the heat transfer area can be reduced and the device can be downsized.

In the absorption-type cold / hot water simultaneous supply heat pump of the first structure, the absorption-type cold / hot water of the second structure is provided so that the heat source fluid flows in the order of the condenser and the absorber to exchange heat. In the simultaneous supply heat pump, the temperature and pressure in the condenser do not rise as much as the conventional absorption heat pump that flows by exchanging heat with the heat source fluid in the order of the absorber and the condenser, so the regeneration pressure can be lowered and the concentration can be increased. . For this reason, it is possible to sufficiently increase the concentration of the absorbing liquid under atmospheric pressure, and in this respect, the device can be downsized.

Further, in the absorption-type cold / hot water simultaneous supply heat pump of the first structure, about half of the heat source fluid exchanges heat with the absorber to bypass the condenser, and about half of the remaining heat with the condenser. Even in the absorption-type cold / hot-water simultaneous supply heat pump of the third configuration provided so as to replace the absorber and bypass the absorber, the refrigerant vapor in the condenser is generally larger than the calorific value generated when the refrigerant absorbs the absorbing liquid in the absorber. Since the amount of heat required to condense the heat is smaller, the temperature and pressure in the condenser must rise as much as the conventional absorption heat pump that flows by exchanging the entire amount of the heat source fluid in the order of the absorber and the condenser. Therefore, in this case as well, the regeneration pressure can be lowered and the concentration can be increased, so that the apparatus can be downsized with the same operational effect as the absorption type cold / hot water simultaneous supply heat pump of the second configuration.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to FIGS. In these figures, the parts denoted by the same reference numerals as those in FIG. 4 have the same functions as those described with reference to FIG. 4, and description thereof has been omitted within the range that does not hinder the understanding of the present invention.

(Embodiment 1) A first embodiment of the present invention based on FIG.
This embodiment of the absorption-type cold / hot water simultaneous supply heat pump has almost the same structure as the conventional double-effect absorption heat pump shown in FIG. The heat source fluid for heating, for example, warm water, which has circulated through the work and radiates heat by work (not shown) such as a heating load and a hot water supply load (hereinafter, referred to as a heating load) and has recirculated after being cooled to 40 ° C., for example, warm water. -In order to cool the inside of the absorber 7 in order, cool the inside of the absorber, increase the temperature of the hot water itself, and connect it to the pipe so that the absorbing liquid does not use a conventional simple LiBr aqueous solution, but the crystallization limit. Neutral salts capable of increasing temperature, eg LiI, LiC
l and LiNO ₃ are added to LiBr100 at 7
The aqueous solution added at a ratio (molar ratio) of 5, 41, 25 is used.

For this reason, the first line indicated by the solid line in FIG.
The crystallization limit line a in the double-effect absorption-type cold / hot water simultaneous supply type heat pump according to the embodiment of FIG. While cooling to 40 ° C. and supplying it to the cooling load (not shown) from the cold water pipe 16, the temperature drops to 40 ° C. and the condenser 4
When comparing the operation when the hot water refluxed to the absorber 7 is heated to 45 ° C. and supplied from the cooling water pipe 17 to a heating load (not shown) or the like, the conventional method using the LiBr aqueous solution as the absorbent shown by the broken line in FIG. As shown in FIG. 2, the crystallization limit line b of the double-effect absorption heat pump is relaxed by about 10 ° C., and the difference between the concentrated solution concentration and the crystallization limit line a (crystallization limit concentration) is Expanding, it can be seen that the present invention is more difficult to crystallize than the prior art.

From the cycle diagram shown in FIG. 2,
The double-effect absorption cold / hot water simultaneous supply type heat pump of the present invention indicated by the solid line with the symbol A has a lower regeneration pressure than the conventional double-effect absorption heat pump indicated by the dashed line with the symbol B. It can be seen that the concentration is increased. Therefore, in the absorption-type cold / hot-water simultaneous supply heat pump of the present invention, the heat transfer area can be reduced, or the absorption liquid concentration can be sufficiently increased under atmospheric pressure. Can be miniaturized.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIG.
The absorption type cold / hot water simultaneous supply heat pump of the second embodiment uses the same solution as that of the first embodiment as the absorption liquid, and flows through the cooling water pipe 17 to cause a heating load (not shown). For example, about half of the warm heat source fluid for heating, which has recirculated after being cooled to 40 ° C., for example, warm water flows to the absorber 7 to bypass the condenser 4 and the remaining half is absorbed. It is a double-effect absorption cold / hot water simultaneous supply heat pump configured to bypass the vessel 7 and flow to the condenser 4.

Normally, the cold heat consumed for condensing the refrigerant vapor in the condenser 4 is less than half the amount of heat generated when the refrigerant is absorbed in the absorbing liquid in the absorber 7, and therefore, as described above. In the case of the conventional double-effect absorption heat pump in which the entire amount of warm water is made to flow into the absorber 7 and the condenser 4 in this order by flowing approximately half of the warm water that has cooled to 40 ° C and has recirculated to the condenser 4. As a result, the temperature and pressure inside the condenser 4 decrease.

Therefore, also in the absorption type cold / hot water simultaneous supply type heat pump of the second embodiment, the reduction of regeneration pressure and the increase in concentration are similar to those of the absorption type cold / hot water simultaneous supply type heat pump of the first embodiment. Therefore, it is possible to reduce the heat transfer area and sufficiently increase the concentration of the absorbing solution under atmospheric pressure. Therefore, also in this case, the device can be made smaller than the conventional absorption heat pump.

Since the present invention is not limited to the above embodiments, various modifications can be made without departing from the spirit of the claims.

For example, as the cold heat source fluid that is cooled in the evaporator 5 and supplied to the cooling load, a low boiling point heat medium (CFC) or the like can be used in addition to water, and the condenser 4 and the absorber 7 heat it. In addition to water, a low boiling point heat medium (CFC) can also be used as the heat source fluid that is supplied to the heating load.

Control means for adjusting the heating power of the combustion device 2 so that the temperature of the cold heat source fluid cooled by the evaporator 5 and supplied to the cooling load becomes a predetermined temperature (for example, 7 ° C.),
Pipes for adjusting the temperature of the hot heat source fluid, which is heated by the condenser 4 / absorber 7 and supplied to the heating load, to a predetermined temperature (for example, 45 ° C.), independently of the temperature of the cold heat source fluid, For the control means and the like, conventionally known techniques are used as they are.

[0021]

As described above, in the absorption heat pump for forming the circulation cycle of the refrigerant and the absorption liquid by connecting the absorber, the evaporator, the condenser, the regenerator, the heat exchanger, the absorption liquid pump, etc. by piping,

A water-lithium bromide solution containing a plurality of neutral salts for increasing the crystallization limit temperature is used as an absorption liquid, and a cold heat source fluid is supplied from an evaporator and a heat heat source fluid is supplied from an absorber / condenser. In the absorption-type cold / hot-water simultaneous supply heat pump of the first configuration that is capable of simultaneously supplying water, the crystallization limit temperature is higher than that of the conventional absorption heat pump using the lithium bromide aqueous solution as the absorption liquid. It can be operated, which reduces the heat transfer area and allows the device to be downsized.

Further, in the absorption type cold / hot water simultaneous supply type heat pump of the second structure provided so that the heat source fluid is heat-exchanged and supplied in the order of the condenser / absorber, the temperature and pressure in the condenser Does not rise as much as the conventional absorption heat pump configured to flow the heat source fluid by exchanging heat with the absorber and the condenser in this order, so that the regeneration pressure can be reduced and the concentration can be increased. Therefore, it is possible to sufficiently increase the concentration of the absorbing liquid under atmospheric pressure, and in this respect, the device can be downsized.

In addition, about half of the heat source fluid is heat-exchanged by the absorber to bypass the condenser, and the other half is heat-exchanged by the condenser to bypass the absorber.
Even in the absorption-type cold / hot water simultaneous supply type heat pump having the configuration described above, the amount of heat required for condensing the refrigerant vapor in the condenser is generally larger than the amount of heat generated when the refrigerant absorbs the absorbing liquid in the absorber. Because it is small, the temperature and pressure inside the condenser do not rise as much as the conventional absorption heat pump that flows by exchanging heat with the heat source fluid in the order of the absorber and the condenser. Therefore, the regeneration pressure can be lowered and the concentration can be increased. Therefore, also in this case, the device can be downsized for the same reason as the absorption-type cold / hot water simultaneous supply heat pump of the second configuration.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a first embodiment.

FIG. 2 is an explanatory diagram of a crystallization limit line and the like.

FIG. 3 is an explanatory diagram of a second embodiment.

FIG. 4 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 1 High Temperature Regenerator 2 Combustion Device 3 Low Temperature Regenerator 4 Condenser 5 Evaporator 7 Absorber 8 Low Temperature Heat Exchanger 9 High Temperature Heat Exchanger 10 Intermediate Liquid Pipe 11 Concentrated Liquid Pipe 12 Absorption Liquid Pump 13 Rare Liquid Pipe 14 Refrigerant Conduit 15 Refrigerant liquid pipe 16 Cold water pipe 17 Cooling water pipe 18 Refrigerant pump a (Invention) crystallization limit line b (Prior art) crystallization limit line A (Invention) cycle diagram B (Prior art) cycle diagram

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshihiro Yamada 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (3)

[Claims] 1. A neutral salt for increasing a crystallization limit temperature by forming a circulation cycle of a refrigerant and an absorption liquid by connecting an absorber, an evaporator, a condenser, a regenerator, a heat exchanger, an absorption liquid pump, etc. with a pipe. Is a water-lithium bromide solution containing a plurality of kinds of as the absorption liquid, it is possible to simultaneously supply the cold heat source fluid from the evaporator and the hot heat source fluid from the absorber / condenser Absorption type cold / hot water simultaneous supply type heat pump. 2. The absorption-type cold / hot water simultaneous supply heat pump according to claim 1, wherein the heat-source fluid is heat-exchanged and supplied in the order of the condenser and the absorber. 3. About half of the heat source fluid exchanges heat with an absorber to bypass the condenser, and about half of the remaining heat exchanges with a condenser to bypass the absorber. The absorption-type cold / hot water simultaneous supply type heat pump according to claim 1.