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In recent years, as the core components of the compressor refrigeration system, in addition to own performance improving, its research and development has been around two topics, environmental protection and energy saving technology development mainly has the following several aspects. A, adapt to the change of the refrigerant Damage to the ozone layer has a role of CFCs and HCFCs refrigerants, eliminated the material is specified by the Montreal protocol, in the late 1980 s began to gradually replaced by HFCs and natural working substance. Compressor in order to meet the alternative refrigerants and the considerable improvement in technology, developed everything, R404A, R410A and R407C HFCs refrigerant compressor, such as refrigerant compressor and R600a and R290 HCs class. CO2 across critical cycle with compressor has been successfully used in automobile air conditioning and heat pump water heater, the average CO2 compressor and NH3 cascade system is used in commercial refrigeration, enclosed NH3 compressor is used in air conditioners and refrigerators. Second, the frequency conversion technology and digital vortex. Compressor stepless regulating capacity in a row, to better match the refrigeration unit load changes, effectively improve the whole working efficiency and adaptability of the unit. Frequency conversion rolling piston and whirlpools compressor has been widely used in all kinds of air conditioning unit, the frequency conversion technology is expanding its application to the piston, screw and centrifugal compressor, refrigerator with frequency conversion piston compressor production also gradually expanding. In September 2008 in China promulgated the new air-conditioning energy efficiency standards will further stimulate the development of frequency conversion technology. Mechanical continuously variable volume of digital vortex compressor in the application of split air conditioning unit in gradually expanding. Three, economizer, tonifying qi and single stage compression Single stage compression refrigeration system normal work of condensation and evaporation temperature difference of 40-60 ℃, in low temperature and low temperature air source heat pump and other occasions, the temperature can reach 75 ℃. To make a single stage compressor can generate large temperature difference, economizer fill gas screw compressor and scroll compressor (EVI) have been batch production, fill gas piston compressor and the rolling piston compressor as well as research. Stand-alone secondary compression of multi-cylinder piston compressor applied in refrigerating equipment is becoming more common, single secondary compression of double cylinder rolling piston compressor have been successfully developed and start the application. Single level 3 compression of centrifugal compressor is a sign of high efficiency products. Fourth, expand the sphere and the application field capacity Longest, adapt to the strongest reciprocating piston compressor capacity is a wide range of gm models, in the refrigerator and commercial refrigeration field to continue, and in the field of air conditioning surface under the rolling piston type, the vortex type and the challenges of the screw compressor. With magnetic levitation bearing compact centrifugal compressor, it is highly mechanical and electrical integration products, began to applied to the water chiller, and began to overlap with screw compressor capacity. Large vortex compressor and fully enclosed screw compressor have been batch production, both have cohesion on capacity, used in frozen vortex compressor production continues to grow, three screw compressor also put on the market. On the rolling piston compressor capacity scope has been expanded to 14 HP, next to 1/8 HP. To solve the problem of leakage and wear after using R410A, active research on deformation and structure of the rolling piston compressor, the swinging rotor compressor for engineering application. Five, special and special use of the compressor Shaft seal is the key component of bus air conditioning compressor, the compressor is still the leading domestic brands. Air source heat pump water heater dedicated rolling piston compressor has batch production. 48 v dc 12 v, 24 v and various special power driven air conditioning, refrigerator compressor has been mass production, and with the rolling piston, piston, triangle rotor type mainly. Microelectronic device cooling and the human body the miniature compressor of air conditioning use also in development. Anyhow, compressor technology should conform to the changes of The Times, constantly improve their own performance, continue to expand application field, and constantly develop new compressor.

In recent years, our country has the evaporative condenser are applied to all kinds of refrigeration system, including cold storage, central air conditioning, industrial refrigeration units, ammonia refrigeration system, etc. And early in the 1970 s, developed countries began to use an evaporative condenser instead of water cooled condenser. Relative to the traditional way of condenser, the evaporative condenser has the following advantages: one, the energy conservation as air-cooled condenser cooling capacity is limited by environmental dry bulb temperature, wet bulb temperature and the evaporative condenser is limited by the environment, and the wet bulb temperature 8 ~ 14 ℃ lower than the general dry bulb temperature, combined with upper fan equipment negative pressure caused by the environment, so compared with air cooling condenser, evaporative condenser condensation temperature is low. And condensing temperature rise per 1 ℃, the refrigerating capacity of the unit power consumption will increase by 3% ~ 3%, so the total power consumption of evaporative condenser will be significantly reduced, energy saving effect is obvious. In the air conditioning refrigeration system relative to other condenser can be energy-saving 20% ~ 40%. Second, the water evaporative condenser make full use of the latent heat of vaporization of water, the general water cooled condenser cooling water every 1 kg can take 16.75 ~ 25.12 KJ heat, and 1 kg of water evaporation at room temperature can take away heat about 2428 KJ, and theory of evaporative condenser water consumption is only 1% of the water cooled condenser, considering the spatter loss, pollution in water and other factors, the actual water consumption is about 5% ~ 10% of water cooled. Evaporative condenser greatly reduce the loss of water, the serious shortage of water resources in China's northern region has important significance. Three, compact structure Because do not need to set the cooling tower, so the whole device has the advantages of compact structure, small volume, covers an area of less, evaporative condenser through the condenser coil and cooling tower into one saves valuable space, and there is no need to cooling tower/condenser system that need larger water pump and pipeline. Evaporative condenser requires only about 50% of the same specifications of the air-cooled condenser of windward area. Four, save investment cost the evaporative condenser cooling towers and condenser, circulating tank, circulating pumps and pipes integrated as a whole, this reduces the cooling tower, circulating pumps and pipes, such as equipment, also reduce the cooling towers/condenser processing and the cost of the installation of a single element in the system. Because of the evaporative condenser efficiently using evaporative cooling heat transfer method, so can effectively reduce the heat transfer area, the number of the fan and fan motor power consumption. Five, polluting the environment using a lot of chemical plant or spray condenser shell and tube type, in the summer because of the condensing pressure is too high, often using step-down "empty", but each time the release isn't non-condensable gas, which contains a large amount of ammonia, according to the relevant departments of the sampling analysis, sometimes as high as 90%, not only ammonia loss serious, also cause environmental pollution. But there is no this kind of phenomenon after using evaporative condenser.