Air conditioning unit air conditioning unit cooling system mainly refers to the main, that such water-cooled chiller, air chiller and so on. And sometimes also known as whole systems, such as central air conditioning system for the air conditioning unit, if it is small (home), it is generally refers to the overall. Single-stage vapor compression refrigeration system is determined by the refrigeration compressor, condenser, evaporator and the throttle valve four basic components. Which in turn is connected between the pipe to form a closed system, the refrigerant in the system constantly circulates floorstanding units, a change of state, heat exchange with the outside world. After the liquid refrigerant absorbs heat of the object to be cooled in the evaporator, a low-temperature low-pressure vaporized steam, is sucked into the compressor, compressed into a high temperature high pressure steam into the condenser, the condenser of the cooling medium (water or air ) heat, condenses to a high pressure liquid, low temperature low pressure throttled by the throttle valve refrigerant enters the evaporator again absorbs heat of vaporization, to achieve the purpose of the refrigeration cycle. Thus, the refrigerant in the system through evaporation, compression, condensation, throttling four basic process is complete a refrigeration cycle. In the refrigeration system, evaporator, condenser, compressor and the throttle refrigeration systems essential four pieces, which were the evaporator is cold transport equipment. Wherein the refrigerant absorbing the heat of the object to be cooled to achieve cooling. New air compressor is the heart of modular units, plays inhalation, compression, transport refrigerant vapor effect. Condensers are devices emit heat, the heat absorbed by the evaporator heat compressor work together with the transformed passed to the cooling medium away. Throttle refrigerant from throttling effect, while the number of control and regulation of the refrigerant flow into the evaporator liquid, and the system high side and low side into two parts. The actual cooling systems, in addition to the four pieces outside, often have some auxiliary equipment, such as solenoid valves, distributor, dryer, collector, fusible plug, pressure controllers and other components, which are to improve the operation of economy, reliability, and security and settings. New air conditioning units each functional segment return air mixing section 1, the new return air position as designed at the ends, respectively, at the top or the left and right side of the set, such as when the sample is inconsistent with this, to provide specific open position. In the new return air control valve can be assembled, the actuator has a manual, electric and pneumatic three types, optionally by the user. 2, the filter section there early, in effect filter two, with a diamond-shaped bag, four peaks bag, can also be equipped with an automatic winding type, filter wheel with high-quality polyester non-woven, and the use of filter Quick-release institutions, capping display and alarm devices. New exhaust segment (also known as flat-topped sub-air mixing section) of this paragraph cabinets has been a return valve, the valve before and after the top of the box, each with an exhaust port and a new outlet, and with a control valve, which is: if There are back to fans for the air conditioner return air discharge portion, so that the new wind and a return air mixing ratio as required; when the DC system transition season, a return valve should be closed, fully open the exhaust valves and new valve. Energy recovery segment for dual fan system for the cross-points and exhaust air mixing with energy recovery. The segment has a return valve cabinets, top energy collector, it is a use of the exhaust of cold (hot) to the indirect cooling (heating) fresh air, fresh air through the plate energy recovery, recycled exhaust sensible heat around 60% of energy. Middle section (maintenance section) connection and crew from the transition section of this paragraph internal overhaul lighting. Before the filter section, cooling section, the front and rear heating section, muffler section shall be located in the middle section. Secondary air segment connecting secondary air tubes of the middle segment unit, the top can be set regulating valves, equipped with manual, electric or pneumatic adjusting mechanism, optionally by the user, this section may be all and in blower section. Table cold section cooler with four, six, eight calandria structure brass string foil, aluminum foil double flanging ripple edge form heat recovery units, a large elbow heat exchanger 60% reduction in welding elbow, improved heat exchange power, the fixed and rotary heat exchangers points two, users may need to choose one, use steam or hot water heating medium. _ _ Runner unit air conditioning units, for switching Ltd provided by wucheng Dingrui air conditioning equipment. Wucheng Dingrui Air Conditioning Equipment Co., Ltd. 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