CN200952790Y

CN200952790Y - Air-cooled absorption air conditioning machine set

Info

Publication number: CN200952790Y
Application number: CNU2006200357946U
Authority: CN
Inventors: 钟明; 杨涛; 王明全
Original assignee: Sichuan Changhong Electric Co Ltd
Current assignee: Sichuan Changhong Air Conditioner Co Ltd
Priority date: 2006-09-30
Filing date: 2006-09-30
Publication date: 2007-09-26
Anticipated expiration: 2016-09-30

Abstract

The utility model discloses an air-cooled absorbing air conditioning unit that can reduce secondary heat-exchanging temperature difference, which comprises an air-cooling condenser, an air-cooling cooler and an absorber. The air-cooling condenser is placed at the upper part of the air-cooling cooler and the absorber, and are communicated each other to form a circuit. On the air-cooling condenser, a vacuum membrane valve that is communicated with the air-cooling condenser and for vacuuming is provided. Based on the principle for gravity heat pipe, the circulation media are injected into a closed circulation circuit consisting of an air cooler and the absorber, but the injected volume has changed from former full-liquid state into non-full-liquid state. Based on the former sensible-heat exchanging, phase-transformation latent-heat exchanging is realized, the overall heat exchanging capability is improved, hence secondary heat-exchanging temperature difference can be reduced, the heat-exchanging area of the absorber and the air cooler are reduced, which guarantees that the system can still meet the refrigerant when the outdoor temperature is high, so that the system has a high energy efficiency ratio, and can be used on prior air-cooled absorbing air conditioning units.

Description

Air-cooled absorption type air-conditioner unit

Technical field

The utility model relates to a kind of air-conditioning unit, especially a kind of air-cooled absorption type air-conditioner unit.

Background technology

At present, existing air-cooled absorption type air-conditioner unit mainly comprises as shown in Figure 1: parts such as high pressure generator, low pressure generator, absorber, evaporimeter, air-cooled condenser, air-cooled cooler, combustor, solution pump, air-conditioning water pump, cryogenic fluid pump, water circulating pump, axial flow blower.Since the coefficient of heat transfer of air-cooled absorption type air-conditioner unit well below with water-cooled absorption type air-conditioner unit, and heat exchange area can not unrestrictedly be increased by volume restrictions, cause absorber temperatures to increase thus, thereby cause the high pressure, high temperature, high concentration of refrigeration system, easy problem such as crystallization.These problems have become the bottleneck that air-cooled absorption type air-conditioner is realized the marketization, scale.

In order to address these problems, present method is to get rid of absorber solution heat by the heat transfer medium cycle heat exchange between air-cooled cooler and absorber, water as refrigerant steam is absorbed outside absorber tube, this has not only increased the contact area of water as refrigerant steam and absorbent solution, and the water vapor pressure loss is little, mass transfer effect is able to efficient hardening, also helps simultaneously to dwindle the absorber mass transfer area.But because circulatory mediator and air and absorber solution are the sensible heat exchanges, therefore excessive for fear of absorber and air-cooled cooler heat exchange area, between air and heat transfer medium and heat transfer medium and absorber solution, need certain heat transfer temperature difference, because the secondary heat exchange that this three exists, often cause easily that the absorber outlet temperature increases, this has formed suitable restriction for solving air-cooled circulation to high temperature, high concentration, the skew of high pressure direction.

The utility model content

In order to overcome the secondary heat exchange temperature difference that existing air-cooled absorption type air-conditioner unit utilizes the cooling medium circulation to conduct heat and exist between air-cooled cooler and absorber, be difficult to solve the defective of circulation to high temperature, high concentration, the skew of high pressure direction, the utility model provides a kind of air-cooled absorption type air-conditioner unit that can reduce the secondary heat exchange temperature difference.

The technical scheme that its technical problem that solves the utility model adopts is: air-cooled absorption type air-conditioner unit, comprise air-cooled condenser, air-cooled cooler and absorber, air-cooled condenser is arranged on the top of air-cooled cooler and absorber and is interconnected forms the loop, and air-cooled condenser is provided with the vacuum diaphragm valve that is communicated with it.According to the gravity assisted heat pipe principle, only need on the condenser cooler of existing air-cooled absorption type air-conditioner unit, to increase a vacuum diaphragm valve that is used to vacuumize usefulness, circulatory mediator is injected the closed cycle loop of air-cooled cooler and absorber composition, but charging amount becomes non-full liquid status by original full liquid status, its topping up height determines according to the absorber height, concrete charging amount is higher than the absorber extreme higher position and gets final product, to guarantee that cooling medium carries out sufficient sensible heat exchange in absorber, the space of reservation is as the evaporation and the condensation of cooled circulated medium.Residual air with in vavuum pump connection vacuum diaphragm valve extraction air-cooled condenser, air-cooled cooler and the absorber composition loop makes the certain vacuum of maintenance in the loop, and the size of vacuum is corresponding with the saturation temperature of medium in the absorber.According to the gravity assisted heat pipe principle, cooled circulated medium except the sensible heat with absorber solution exchanges, also carries out the exchange of evaporative phase-change latent heat simultaneously in the higher absorber of temperature; And cooled circulated medium also carries out the exchange of steam condensation latent heat of phase change simultaneously except the sensible heat with air exchanges in the lower air-cooled cooler of temperature.Like this, make indirect cooling medium circulation process keep certain vacuum, can realize that cooled circulated medium and absorber solution and cooler air are in evaporating state and condensing state respectively in heat transfer process, on original sensible heat exchange basis, realize the latent heat of phase change heat exchange.

The beneficial effects of the utility model are: owing to realized the heat exchange of cooling medium latent heat of phase change by the gravity assisted heat pipe principle, strengthened whole exchange capability of heat, thereby can reduce the secondary heat exchange temperature difference, can dwindle the heat exchange area of absorber and air-cooled cooler, the assurance system still can satisfy the refrigerating capacity requirement when outdoor temperature is higher, make system have higher Energy Efficiency Ratio, can on existing air-cooled absorption type air-conditioner unit, use.

Description of drawings

Fig. 1 is the schematic diagram of existing air-cooled absorption type air-conditioner.

Fig. 2 is the schematic diagram after the utility model improves original air-cooled absorption type air-conditioner.

Fig. 3 is the schematic diagram that improves the heat transfer process of back circulatory mediator in absorber, and the dark part in the pipeline is a liquid cooling medium, is expressed as the sensible heat endothermic process; Light-colored part in the pipeline is the mixed cooling medium of vapour-liquid, is expressed as sensible heat and latent heat endothermic process simultaneously.

Fig. 4 is the schematic diagram that improves the heat transfer process of back circulatory mediator in air-cooled cooler, and the dark part in the pipeline is a liquid cooling medium, is expressed as the sensible heat exothermic process; Light-colored part in the pipeline is the mixed cooling medium of vapour-liquid, is expressed as sensible heat and latent heat exothermic process simultaneously.

Be labeled as among the figure: high pressure generator 1, low pressure generator 2, absorber 3, evaporimeter 4, air-cooled condenser 5, air-cooled cooler 6, combustor 7, solution pump 8, air-conditioning water pump 9, cryogenic fluid pump 10, circulating pump 11, axial flow blower 12, vacuum diaphragm valve 13.

Wherein, arrow is depicted as the flow direction of various fluids.

The specific embodiment

Below in conjunction with drawings and Examples the utility model is further specified.

As Fig. 2, Fig. 3, shown in Figure 4, existing air-cooled absorption type air-conditioner unit comprises parts such as high pressure generator 1, low pressure generator 2, absorber 3, evaporimeter 4, air-cooled condenser 5, air-cooled cooler 6, combustor 7, solution pump 8, air-conditioning water pump 9, cryogenic fluid pump 10, circulating pump 11, axial flow blower 12, vacuum diaphragm valve 13, and air-cooled condenser 5 is arranged on the top of air-cooled cooler 6 and absorber 3 and is interconnected forms gravity assisted heat pipe formula loop.Air-cooled absorption type air-conditioner unit of the present utility model, be on the basis of existing air-cooled absorption type air-conditioner unit, air-cooled condenser 5 is provided with the vacuum diaphragm valve 13 that is communicated with it, other parts need not done any change, originally the cooled circulated medium that injected air-cooled cooler 6 and absorber 3 is filled state by full liquid become non-full liquid and fill state, the space of reserving in the loop is taken out residual air and is made the certain vacuum of maintenance in the loop by being connected vavuum pump on the vacuum diaphragm valve 13.

The heat transfer process of circulatory mediator in absorber 3 as shown in Figure 3, cooled circulated medium is pumped into by circulating pump 11 and carries out heat exchange in the absorber 3, because absorber 3 solution temperatures are higher than circulatory mediator, so circulatory mediator is an endothermic process in this process, bigger in absorber 3 lower tube internal pressures, there is no vacuum section, mainly carry out the sensible heat exchange by means of the temperature difference, and reduce in absorber 3 upper pressure, existing partial vacuum makes the vaporization of part cooled circulated medium and carries out the latent heat exchange in the pipe, then as shown in Figure 4, the liquid-vapor mixture of cooled circulated medium is divided into many parallel pipelines by knockout earlier and flows in the air-cooled cooler 6, steam state and liquid cooled circulated medium and air carry out the exchange of latent heat and sensible heat respectively simultaneously in air-cooled cooler 6, heat is discharged in the outdoor air, and cooled circulated medium is in circulating pump 11 inflow absorbers 3 then.By constantly repeating said process, effectively strengthened heat exchange, reduced the secondary heat exchange temperature difference, thereby well avoided air-cooled circulation to high temperature, high concentration, the skew of high pressure direction, make the performance of air-cooled absorption type air-conditioner be able to obvious raising.

Claims

1, air-cooled absorption type air-conditioner unit, comprise air-cooled condenser (5), air-cooled cooler (6) and absorber (3), air-cooled condenser (5) is arranged on the top of air-cooled cooler (6) and absorber (3) and is interconnected forms the loop, and it is characterized in that: air-cooled condenser (5) is provided with the vacuum diaphragm valve (13) that is communicated with it.