With worldwide energy has become tighter, fossil fuels and significantly reduce growth in energy demand, prompting people to explore new ways to improve energy efficiency and the effective utilization of energy. Depending on the level of energy utilization countries, 43% to 70% of the energy mainly in the form of heat is lost, it will result in the city's "heat island effect." Therefore, American and European countries attach great importance to research and practice air conditioning heat recovery technology to achieve secondary use of energy, thereby reducing energy consumption and emissions directly, in order to achieve energy saving and environmental protection purposes. In China, in recent years, China's air-conditioning heat recovery technology has been rapid development in the practical application of energy-saving effect is obvious units, widely used in hotels, hospitals, schools, factories, large stadiums and other places. Air conditioning unit air conditioning unit cooling system mainly refers to the main, that such an integrated water-cooled chiller units, air chillers and so on. The entire system is sometimes called the new air unit manufacturers, such as central air conditioning system for the air conditioning unit, if it is small (home), it is generally refers to the overall. Cooling system main components are the compressor, condenser, evaporator, expansion valve (or capillary, subcooling control valve), a four-way valve, double valves, check valves, solenoid valves, pressure switches, fusible plugs, the output pressure regulating valve , pressure controller, storage tank, heat exchangers, collectors, filters, dryers, automatic opening and closing, closing valves, liquid injection plugs and other components. Electrical system main components are motors (compressors, fans, etc. use), operating switches, magnetic contactors, chain relay, over current relay, Thermal overcurrent relay, temperature regulator, humidity regulator, temperature switch (defrost, to prevent frozen and other use). Compressor crankcase heater, water relays, computer boards and other components. Control system consists of a plurality of control devices, which are the: Refrigerant Controller: expansion valves, capillary. Refrigerant loop controllers: four-way valve, check valve, double valve, solenoid valve. Refrigerant pressure controller: Pressure opening and closing, the output of the pressure regulator valve, pressure controller. Motor protection: overcurrent relays, thermal dynamic overcurrent relay, temperature relay. Temperature regulator: The temperature position adjustment, temperature proportional regulator. Humidifiers: Humidity bit regulator. Defrost control: defrost temperature switches, defrost relay, various temperature switch. Cooling water control: without water relays, water regulating valves, pumps and the like. Alarm Control: over-temperature alarm, over wet alarm, undervoltage alarm and fire alarm, smoke alarm. Other control: Indoor fan speed controller, the outdoor fan speed controller. Air conditioning unit manufacturers | unit | refrigeration system, provided by wucheng Dingrui Air Conditioning Equipment Co., Ltd .. Wucheng Dingrui Air Conditioning Equipment Co., Ltd. (www.wcdrkt.com) (www.wcdrkt.com) strong, credible, Shandong Texas fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Dingrui into the brilliant air conditioning and you work for a better future!