JPH0799293B2 - Double-effect air-cooled absorption type air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a double-effect air-cooled absorption type air conditioner, and more particularly, to a heat transfer between an indoor unit and an outdoor unit by means of a liquid refrigerant, and if a plurality of them are cooled, The present invention relates to a double-effect air-cooled absorption type air conditioner suitable for performing a separate multi-type cooling by an indoor unit.

[Prior art]

The water-cooled double-effect absorption chiller that has been widely used in the past has the problem that it costs a lot to install, maintain, and manage water for a cooling water system such as a cooling tower. The development of the machine has proceeded rapidly.

Therefore, as an air-cooled absorption type chiller using water as a refrigerant and lithium bromide as an absorbent, for example, JP-A-61-4997.
The technique described in Japanese Patent No. 0 has been developed, and a structure in which a fin and a fin are provided outside the vertical pipe is used so that the absorber and the condenser are cooled by an air flow by a fan.

Further, a conventional technique for performing cooling or the like by a separate multi system is, for example, in an air-cooled absorption type refrigerator using water as a refrigerant and lithium bromide as an absorbent, a pipe for carrying a refrigerant vaporized in an indoor unit to an air unit. From the constraints,
Further, in a refrigerator using a Freon-based refrigerant, both refrigeration cycles are considered to have a single effect due to the latent heat of the refrigerant.

However, no consideration was given to the adoption of an efficient double-effect refrigerant cycle and an air cooling system.

[Problems to be solved by the invention]

Since the above-mentioned conventional technique vaporizes the refrigerant in the indoor unit and cools it by its latent heat, if a double-effect cycle using water as the refrigerant and lithium bromide as the absorbent is adopted, the outdoor unit and the indoor unit are adopted. There was a problem that the refrigerant circulation system connecting with and became too large to be practical.

The present invention has been made to solve the above-mentioned problems of the prior art, and a refrigerant circulation system of an outdoor unit and an indoor unit with a double effect using water as a refrigerant and lithium bromide as an absorbent is practical. To provide a double-effect air-cooled absorption type air conditioner that adopts an air-cooled absorber and an air-cooled condenser to package the outdoor unit, improve the efficiency of the equipment, and simplify the compact cylinder. Is the purpose.

[Means for solving problems]

In order to achieve the above object, the structure of the double-effect air-cooled absorption type air conditioner according to the present invention includes an evaporator, an air-cooled absorber, an air-cooled condenser, a low-temperature regenerator, a high-temperature regenerator, a solution heat exchanger, and these. An air-cooling absorber, an outdoor unit having a fan for supplying cooling air to an air-cooling condenser, and the evaporator, which is a flash evaporation chamber for self-evaporating a liquid refrigerant, An indoor unit for exchanging heat between the liquid refrigerant flowing from the flash evaporation chamber and the indoor air, and a liquid refrigerant circulation system connecting the flash evaporation chamber of the outdoor unit and the heat exchanger part of the indoor unit. is there.

The concept of the above conventional technique will be additionally described.

When the liquid refrigerant in the flash evaporation chamber, which is the evaporator of the outdoor unit, is sent to the indoor unit, the sensible heat exchanger, which is the indoor unit, exchanges heat with the indoor air to raise the temperature and take away the sensible heat. Cool the air.

The liquid refrigerant whose temperature has risen returns to the flash evaporator of the outdoor unit, where it vaporizes (self-evaporates) and becomes a low temperature liquid refrigerant.

As a result, the outdoor unit and the indoor unit can be connected by a liquid refrigerant circulation system, and the size thereof is about the same as that of a normal cold water circulation system.

Also, during this refrigeration cycle, the outdoor unit is packaged by air-cooling the outdoor unit's absorber and condenser, and a plurality of indoor units are provided and connected by the liquid refrigerant circulation system to provide a direct expansion separate multi system. Air conditioning is established.

[Action]

In a double-effect air-cooled absorption type air conditioner using water as a refrigerant and lithium bromide as an absorbent, the liquid refrigerant in the flash evaporation chamber of the outdoor unit reaches about 4 ° C. and is sent to the indoor unit. In the indoor unit, heat exchange between the liquid refrigerant and the room air is performed, and a heat quantity equivalent to the refrigerant capacity is spilled out of the room due to the temperature rise of the liquid refrigerant. The liquid refrigerant whose temperature has risen is returned to the outdoor unit evaporator (flash evaporator) again, and since the internal pressure of the evaporator is lower than the saturated vapor pressure of the liquid refrigerant after the temperature rise, it is vaporized (self-evaporated) here. , Becomes saturated steam. Therefore, the heat transfer by the liquid refrigerant is established between the outdoor unit and the indoor unit, and this liquid refrigerant circulation system can be made to have the same size as the case where heat is transferred by circulating cold water. Will enable the direct expansion method and the separate multi method of the double-effect air-cooled absorption type air conditioner, which could not be put to practical use.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cycle system diagram of a dual-effect air-cooled absorption type separate multi-air conditioner according to an embodiment of the present invention.

In the figure, reference numeral 1 is a flash evaporation chamber related to an evaporator for vaporizing (self-evaporating) a liquid refrigerant. Reference numeral 2 is a refrigerant pump, and 3 is a liquid refrigerant circulation pipe forming a liquid refrigerant circulation system. In the pipe line, a portion indicated by a broken line is a shortened portion showing a distance between the outdoor unit and the indoor unit. Is.

Reference numeral 4 denotes an air-cooled absorber. In this air-cooled absorber 4, a fin 4b for cooling is formed outside the vertical pipe 4a, an upper header is formed by a vapor passage 5 above the vertical pipe 4a, and a lower portion is formed below the vertical pipe 4a. This is a configuration including a Hezda 4c.

6 is a solution pump, 7 is a solution heat exchanger, 10 is a high temperature regenerator,
11 is a low temperature regenerator.

Reference numeral 15 is an air-cooled condenser, and in this air-cooled condenser 15, a fin 15b for cooling is formed outside the vertical pipe 15a, the upper part of the vertical pipe 15a is an upper head by the steam passage 14, and the lower part is below the vertical pipe 15a. This is a configuration including a Hezda 15c.

The air-cooled absorber 4 and the air-cooled condenser 15 are air-cooled by the flow of outdoor air by the fan 20, and the thick arrow in the figure indicates the air flow direction.

The flash evaporation chamber 1, the air-cooled absorber 4, the solution pump 6, the solution heat exchanger 7, the high-temperature regenerator 10, the low-temperature regenerator 11, and the pipes and the fan 20 for connecting these devices are packaged compactly and outdoors. It constitutes a unit.

Reference numeral 21 denotes a plurality of (two in the figure) indoor units arranged in a plurality of separated chambers or a wide chamber, and each of the indoor units 21 is branched from the liquid refrigerant circulation pipe line 3. Heat transfer tube 21a with fins drawn into the unit
And a blower fan 21b for exchanging heat between the room air and the liquid refrigerant in the heat transfer tube 21a. In the figure, a thick arrow near the indoor unit 21 indicates the flow of cold air blown into the room.

As described above, the flash evaporation chamber 1, the refrigerant circulation pipe line 3, the indoor unit 21, and the like exchange heat with the indoor air by the fan 21b to raise the temperature of the refrigerant liquid and vaporize in the flash evaporation chamber 1, so-called direct expansion type. Constitutes the evaporation mechanism of.

Next, the operation of the basic cycle of the dual-effect air-cooling absorption type separate multi-air conditioner having such a configuration will be described.

The liquid refrigerant in the flash evaporation chamber of the outdoor unit is sent out to the liquid refrigerant circulation line 3 by the refrigerant pump 2 and exchanges heat with the indoor air in the sensible heat exchanger section of the indoor unit 21 to sensible heat from the indoor air. And the temperature of the liquid refrigerant rises.

The liquid refrigerant whose temperature has risen flows through the liquid refrigerant circulation conduit 3 to return to the flash evaporation chamber 1 and self-evaporates to become a low temperature liquid refrigerant. The low temperature liquid refrigerant is sent again to the indoor unit 21 by the refrigerant pump 2.

On the other hand, the self-evaporated vaporized refrigerant flows into the air-cooled absorber 4 through the vapor passage 5. The air-cooled absorber 4 is directly cooled by the outside air by the fan 20, and the vaporized refrigerant is absorbed by the concentrated lithium bromide solution which is sprayed from the upper header and flows down in the vertical pipe 4a to become a dilute solution.

This diluted solution is sent out by the solution pump 6, passes through the solution heat exchanger 7, and passes through the diluted solution pipes 8 and 9 to obtain a high temperature regenerator 10,
It is sent to the low temperature regenerator 11.

An external heat source 12 is supplied to the high temperature regenerator 10, and the dilute solution is concentrated by the heat generated when burning in the furnace 10a, and steam is generated at this time. This generated steam is transferred to the heat transfer pipe section of the refrigerant pipe line 13.
The dilute solution in the low temperature regenerator 11 is heated and concentrated via 13a, and the refrigerant itself is condensed and liquefied to become a liquid refrigerant, and the air-cooled condenser 15
Sent to the lower Hezda 15c.

The steam generated from the dilute solution concentrated in the low temperature regenerator 11 is
The liquid flows through the vapor passage 14 into the vertical portion 15a of the air-cooled condenser 15, where it is cooled by the outside air by the fan 20 and becomes a liquid refrigerant. The refrigerant in the flash evaporation chamber 1 flows from the lower header 15c to the refrigerant pipe 16. Return to the tank section.

The solutions concentrated respectively in the high-temperature regenerator 10 and the low-temperature regenerator 11 pass through the solution heat exchangers 7 by the concentrated solution pipes 17 and 18 and then are sent to the upper head of the air-cooled absorber 4 through the concentrated solution pipe 19 and spread. The absorption process is repeated again.

According to the present embodiment, in a dual-effect air-cooled separate multi-air conditioner using water as a refrigerant and lithium bromide as an absorbent, an outdoor unit and a plurality of (two in the figure) indoor units are practical liquid refrigerants. Since they can be connected by a circulation system, cooling air conditioning equipment can be packaged and separated.

In the above-mentioned embodiment according to the drawings, the indoor unit 21 has two
Although the indoor unit 21 is separated from the outdoor unit composed of the air-cooled absorber 4, the air-cooled condenser 15 and the like on the stand, a so-called separate multi system is shown, but the present invention is not limited to this, and the indoor unit is not limited thereto. It is possible that there are three or more, or only one.

In addition, the indoor unit and the outdoor unit may not be separated and may be integrally configured compactly.

〔The invention's effect〕

As described above, according to the present invention, the refrigerant circulation system of the outdoor unit and the indoor unit with a dual effect using water as the refrigerant and lithium bromide as the absorbent is made practical, and the air cooling absorption is performed. It is possible to provide a double-effect air-cooled absorption type air conditioner in which the outdoor unit is packaged by adopting the air conditioner and the air-cooled condenser, and the efficiency of the equipment can be improved and the size can be simplified.

[Brief description of drawings]

FIG. 1 is a cycle system diagram of a dual-effect air-cooled absorption type separate multi-air conditioner according to an embodiment of the present invention. 1 ... Flash evaporation chamber, 2 ... Refrigerant pump, 3 ... Liquid refrigerant circulation line, 4 ... Air-cooled absorber, 7 ... Solution heat exchanger, 10 ... High temperature regenerator, 11 ... Low temperature regenerator , 15 …… Air-cooled condenser, 20 …… Juan, 21 …… Indoor unit, 21a ……
Heat transfer tube, 21b ... Juan.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yoshikazu Nagaoka 5-22-4 Kamisoshiya, Setagaya-ku, Tokyo Kamisoshiya Heights No. 302 (72) Inventor Shinichi Kanno 4-9-4 Takawashi, Habikino-shi, Osaka Prefecture −303 (72) Inventor Sadaju Takemoto 11-8, Toyonen-cho, Chikusa-ku, Nagoya-shi, Aichi (72) Inventor Shigeo Sugimoto 603, Jinritsu-cho, Tsuchiura-shi, Ibaraki Hitate Works Co., Ltd. Tsuchiura Plant (72) Inventor Large Uchi Tomihisa 502, Jinrachicho, Tsuchiura-shi, Ibaraki Machinery Research Laboratory, Hiritsu Seisakusho Co., Ltd. (56) References JP-A-54-116762 (JP, A) SAI-KAI 57-148671 (JP, U)

Claims (5)

[Claims] 1. An evaporator, an air-cooled absorber, an air-cooled condenser, a low-temperature regenerator, a high-temperature regenerator, a solution heat exchanger, and a pipe system for operatively connecting these devices, and the air-cooled absorber and air-cooled condenser. An outdoor unit having a fan for supplying cooling air to the evaporator, the evaporator as a flash evaporation chamber for self-evaporating a liquid refrigerant, and an indoor unit for exchanging heat between the liquid refrigerant flowing from the flash evaporation chamber and room air, A double-effect air-cooled absorption type air conditioner comprising a liquid refrigerant circulation system connecting the flash evaporation chamber of the outdoor unit and the heat exchanger section of the indoor unit. 2. The indoor unit according to claim 1, wherein the indoor unit constitutes one unit having a heat transfer pipe branched from a pipe of a liquid refrigerant circulation system and a fan for one set of outdoor units. A double-effect air-cooled absorption type air conditioner. 3. The indoor unit according to claim 1, wherein a plurality of indoor units are provided with a plurality of heat transfer pipes and fans each branched from a liquid refrigerant circulation system line. A double-effect absorption air conditioner that forms a unit. 4. A double-effect absorption air conditioner according to any one of claims 1 and 2, wherein the indoor unit and the outdoor unit are integrally arranged. 5. The indoor unit according to claim 1 or 3, wherein the indoor unit is arranged in each of a plurality of chambers separated from the outdoor unit via a liquid refrigerant circulation system. Is a double-effect absorption air conditioner.