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Natural gas-based refrigeration and air-conditioning technology has entered the market in developed countries in the middle of the last century. In 1960, the United States natural gas refrigeration accounted for 40% of the commercial refrigeration market share. Refrigeration and air conditioning units powered by natural gas can improve the primary energy utilization rate and save a lot of energy; refrigeration and air conditioning units driven by combustion heat using natural gas as fuel do not use Freon refrigerants, and there is no leakage caused The destruction of the ozone layer. Natural gas combustion almost does not produce S02, ash and suspended particulates. The emission of C02 is only 42% of coal combustion, which can greatly alleviate the q * greenhouse effect. At the same time, SO2 and nitrogen oxide emissions are also significantly reduced, which can reduce the formation of acid rain.
1. Power driven compression refrigeration and air conditioning system using natural gas as energy
At present, most compression refrigeration and air conditioning systems are driven by electricity, which makes the power supply face a severe test. With the increasing awareness of energy saving and environmental protection and the rapid development of the natural gas industry, the compression refrigeration and air conditioning systems driven by internal combustion engines or gas turbines that use natural gas as an energy source account for an increasing proportion in the refrigeration and air conditioning industry. This kind of system not only has the advantages of saving energy and reducing power investment, but also has the advantages of prolonging the service life of the compressor and improving the energy utilization rate.
2. Absorption refrigeration and air conditioning system driven by thermal energy using natural gas as energy
Absorption refrigeration is a refrigeration cycle characterized by a "thermochemical compressor". The gas absorption refrigeration system is generally an ammonia-water system and a water-lithium bromide system. It is characterized by no mechanical moving parts and mechanical wear in the system, which is beneficial to prolong the service life of the unit and reduce noise pollution. The higher combustion quality of natural gas is conducive to improving the refrigeration cycle power factor, reducing energy consumption, and reducing the structure of the cold and hot water unit. Generally, the COP value of the direct-fired Li-Br double-effect absorption refrigeration unit can be divided into 1.1-1.2, while the COP value of the three-effect unit can reach about 1.65.
3. Regenerative dehumidification air conditioning system using natural gas as energy
Regenerative dehumidification air-conditioning system is an air-conditioning equipment that provides cooling by supplying heat energy to the regeneration air heater liquid regenerator. The air-conditioning system treats heat and humidity loads separately, which is not only beneficial to improve the working efficiency of the refrigerator, but also can reduce the capacity of the refrigeration device, reduce the size of the conduit, and save the initial investment; it can also effectively eliminate the condensation water on the surface of the cooler coil , Keep the cooler and cold flow duct dry to prevent the growth of bacteria caused by condensate, to improve indoor air quality, to suppress the corrosion of the device and the decay of building materials.
At present, in places requiring low dew point and areas with large latent heat load, regenerative dehumidification air conditioning system is getting more and more applications. With the adjustment of the energy structure, natural gas, one of the three major energy pillars, has become more and more widely used in production and life. The natural gas-based refrigeration and air-conditioning system has the advantages of high primary energy utilization rate, environmental friendliness, gas supply peaking and power peak shaving and valley filling. The development and utilization of various refrigeration and air-conditioning equipment using natural gas as energy is of great significance for the rational use of energy and environmental protection, and will have a significant impact on the sustainable development of the refrigeration and air-conditioning industry.
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