CN201129808Y - An evaporative cooling and mechanical refrigeration composite air conditioning unit - Google Patents

Abstract

The utility model discloses an evaporative cooling and mechanical refrigeration composite air conditioner unit, which includes a unit fresh air section, a unit filter, a tubular indirect evaporative cooler, a unit return air section, a mechanical refrigeration surface cooler, and The direct evaporative cooler, the unit fan, and the mechanical refrigeration surface cooler are respectively connected to the outlets of the mechanical refrigeration evaporator and the evaporative condenser through pipes. The composite air conditioner unit of the utility model has a simple structure. The multi-stage evaporative cooling unit and the mechanical refrigeration chiller unit are combined into one body. In hot seasons, the evaporative cooling precooling and mechanical refrigeration can be combined to open to meet the air conditioning load requirements of buildings. In most transitional seasons, one stage of indirect plus direct evaporative cooling or two stages of indirect plus direct evaporative cooling are turned on respectively, and fresh air operation provides cooling air for buildings, greatly improving indoor air quality.

Description

An evaporative cooling and mechanical refrigeration composite air conditioning unit

technical field

The utility model belongs to the technical field of air-conditioning and refrigeration, and relates to an air-conditioning unit, in particular to an air-conditioning unit combined with evaporative cooling and mechanical refrigeration.

Background technique

As an effective means of adjusting the indoor environment and air quality of buildings, air conditioning plays an increasingly important role in people's lives. For a centralized air-conditioning system that operates throughout the year, the operating cost of mechanical refrigeration is high and the energy consumption is high. With the extension of the use time, the cost of electric energy consumption, equipment damage and renewal costs continue to rise, resulting in increasing use costs year by year. Not high enough. Furthermore, the refrigerants _CFCs and HCFCs used in mechanical refrigeration will destroy the ozone layer and cause the greenhouse effect. Evaporative cooling technology does not use CFCs but uses water as a refrigerant, which is a pure natural refrigerant. Using it to replace compression refrigeration systems will avoid the use of CFCs and reduce greenhouse gas emissions, and has no pollution to the atmospheric environment. In addition, evaporative cooling technology has low energy consumption, low initial investment, and uses fresh air to ensure good air quality, so it has become an important development direction in the field of modern air conditioning technology.

If the evaporative cooling technology is combined with the traditional mechanical refrigeration, the evaporative cooling technology can be used to pre-cool the fresh air in the high temperature and hot seasons, and then the fresh air will be cooled by mechanical refrigeration; while a large number of transitional seasons use evaporative cooling alone to achieve the purpose of air conditioning. The respective advantages of evaporative cooling and mechanical refrigeration can be fully utilized.

Contents of the invention

The purpose of this utility model is to provide an evaporative cooling and mechanical refrigeration composite air conditioner unit, which uses evaporative cooling technology to pre-cool the fresh air in high-temperature and hot seasons, and then cools it through mechanical refrigeration; the goal of.

The technical solution adopted by the utility model is that the evaporative cooling and mechanical refrigeration composite air conditioner unit includes the unit fresh air section, unit filter, tubular indirect evaporative cooler, unit return air section, and mechanical refrigeration meter arranged in sequence according to the air inlet direction. cooler, direct evaporative cooler and unit fan, and the mechanical refrigeration surface cooler is connected to the outlets of the mechanical refrigeration evaporator and the evaporative condenser through pipes.

The mechanical refrigeration surface cooler is provided with an adjustable bypass ventilation valve.

Compared with traditional evaporative cooling air-conditioning units and mechanical refrigeration chillers, the air-conditioning unit of the utility model has the following characteristics:

1) A three-stage air-conditioning unit is formed by combining a first-stage indirect evaporative surface cooler with a mechanical refrigeration surface cooler and a direct evaporative cooler, and the condenser of the mechanical refrigeration system is an evaporative condenser. "One machine with two uses", on the one hand, it is used as an evaporative condenser when the mechanical refrigeration is turned on in the hottest month of summer; it also has the effect of condensing and cooling the refrigerant. On the other hand, in the transition season when the mechanical refrigerator is not turned on, it is used as a cooling tower and combined with the surface cooler to form a cooling tower cooling type indirect evaporative cooler for "free cooling". In order to improve the heat exchange efficiency of the evaporative condenser, an evaporative cooling filler is installed at the air inlet, which not only pre-cools the air but also plays a role in filtering, and filters the dust and dirt in the air at the inlet, ensuring that the water in the bottom tank is ventilated. The water quality to the surface cooler is relatively clean.

2) The mechanical refrigeration surface cooler is "one device with two uses". In the hot summer season, the low-temperature cold water produced by mechanical refrigeration is passed through. In the transitional season, the mechanical refrigeration unit is not turned on, and the high-temperature cold water produced by the cooling tower is passed.

3) It can provide three-stage evaporative cooling air-conditioning air supply or one-stage indirect evaporative cooling combined with mechanical refrigeration air-conditioning air supply (temperature drop reaches 15-20°C), and can produce 15-20°C refrigerant water.

Description of drawings

The accompanying drawing is a structural schematic diagram of the combined evaporative cooling and mechanical refrigeration air conditioning unit of the present invention.

In the figure, 1. Unit fresh air section, 2. Unit filter, 3. Tube type indirect evaporative cooler, 4. Unit return air section, 5. Mechanical refrigeration surface cooler, 6. Direct evaporative cooler, 7. Unit fan , 8. Mechanical refrigeration evaporator, 9. Evaporative condenser, 10. Adjustable bypass ventilation valve.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The composite air conditioning unit of the utility model takes the first-stage indirect evaporative cooler and the mechanical refrigeration surface cooler as the core, organically combines the tubular indirect evaporative cooler and the small mechanical refrigeration system, and pre-heats the tubular indirect evaporative surface cooler. A three-stage air-conditioning unit composed of a combination of cold and mechanical refrigeration surface coolers and direct evaporative coolers. Among them, the condenser of the mechanical refrigeration system is an evaporative condenser. As shown in the figure, according to the air inlet direction, it includes the unit fresh air section 1, unit filter 2, tubular indirect evaporative cooler 3, unit return air section 4, mechanical refrigeration surface cooler 5, and direct evaporative cooler 6. And unit blower 7.

The mechanical refrigeration surface cooler 5 is connected to the inlet and outlet of the mechanical refrigeration evaporator 8 and the evaporative condenser 9 through pipelines A, B, D, and E respectively through the conversion of the three-way valves P1 and P2; when the mechanical refrigeration surface cooler 5 When the pipes A and B are connected to the mechanical refrigeration evaporator 8, adjust the three-way valves P3 and P4 to close the pipe sections D and E, so that the spray circulating water of the evaporative condenser passes through the pipe section C for self-circulation spraying.

The first-stage tube-type indirect evaporative cooler in the composite air-conditioning unit of evaporative cooling and mechanical refrigeration of the utility model adopts circulating water spraying, and the low-temperature and high-temperature cold water used in the mechanical refrigeration surface cooler 5 come from the mechanical refrigeration chiller and cooling tower respectively. Among them, in order to meet the requirements of different room air supply status points, an adjustable bypass ventilation valve 10 is provided at the surface cooler 5. Under the design working condition, the adjustable bypass ventilation valve 10 is completely closed, and the new return air is completely processed after being mixed. Then sent to the room. When the indoor residual heat and residual humidity change, the electric air valve automatically adjusts the opening, and adjusts the mixing ratio of the bypass ventilation and the processing air, so that the mixed air supply meets the requirements of the indoor state parameters. Combined evaporative cooling and mechanical refrigeration air conditioning units provide cooled air to buildings.

The working process of the evaporative cooling and mechanical refrigeration combined air conditioning unit: in the hot summer season, the outdoor air passes through the fresh air section 1 of the unit in sequence, after being filtered by the unit filter 2, it is cooled by the tubular indirect evaporative cooler 3, and then passed through the return air section 4 of the unit. The mechanical refrigeration surface cooler 5 is further cooled; in the transition season, the outdoor air passes through the fresh air section 1 of the unit successively, and after being filtered by the unit filter 2, it is cooled by the tubular indirect evaporative cooler 3, and then continues to cool down by the surface cooler 5, (at this time, the surface The high-temperature cold water prepared by the cooler through the cooling tower) is enthalpy humidified by the third-stage direct evaporative cooler 6, which can reduce the outdoor air temperature by about 15-20°C, and the cooled air is sent into the building through the unit fan 7.

The utility model is characterized in that the multi-stage evaporative cooling unit and the mechanical refrigeration unit are combined into one, and the energy-saving effect of "free cooling" of evaporative cooling is fully utilized. According to the change of outdoor climate and indoor load, it can be processed separately or in combination with mechanical refrigeration. Buildings provide cooled air. The equipment is "one machine with two uses". On the one hand, it is used as an evaporative condenser when the mechanical refrigeration is turned on in the hottest month of summer; it also has the effect of condensing and cooling the refrigerant. On the other hand, in the transition season when the mechanical refrigerator is not turned on, it plays the role of a cooling tower, and is combined with the surface cooler to form a cooling tower cooling type indirect evaporative cooler for "free cooling". It not only reduces the energy consumption of the mechanical refrigeration system widely used in the current project, improves the refrigeration capacity of the compressor, but also reduces the emission of pollutants.

Claims (2)

1. An evaporative cooling and mechanical refrigeration composite air conditioner unit is characterized in that, according to the direction of the air intake, it includes a unit fresh air section (1), a unit filter (2), a tubular indirect evaporative cooler (3), and a unit Air return section (4), mechanical refrigeration surface cooler (5), direct evaporative cooler (6) and unit fan (7), described mechanical refrigeration surface cooler (5) is connected with mechanical refrigeration evaporator ( 8) Connect with the outlet of evaporative condenser (9). 2. The composite air conditioner unit according to claim 1, characterized in that, the mechanical refrigeration surface cooler (5) is provided with an adjustable bypass ventilation valve (10).