Optical compression refrigeration. Optical compression refrigeration process first photovoltaic conversion device utilizing solar energy into electrical energy, yanhuqu cooled parallel units, refrigeration process is conventional compression refrigeration. Optical compression refrigeration technology advantage is can mature and highly efficient compression refrigeration technology can easily get cold. Optical compression refrigeration system and the lack of electricity in the sunshine good facilities in some countries and regions have been applied, such as the African countries for domestic and medicines refrigerated. But its cost than conventional refrigeration cycle about 3 to 4 times. With the decrease of photovoltaic conversion device efficiency and cost photovoltaic solar refrigeration products will have broad prospects for development. Shanxi Lung Preservation Technology Development Co., Ltd. was established in 2002, Shanxi Academy of Agricultural Sciences, Institute of Science and Technology under the storage and preservation of agricultural enterprises, but also the National Agricultural Science and Technology Park (Taiyuan) enterprises in the park. The company is the vice president of Shanxi Province, Refrigeration and Air Conditioning Industry Association unit, with refrigeration equipment installation and maintenance of B qualification, can undertake the total cost of five hundred million less refrigeration, air-conditioning equipment installation, maintenance. Reason for the low efficiency of the refrigeration unit causes and impact of the low efficiency of the refrigeration unit, there are many, including: lack of refrigeration compressor displacement, less than the rated value, water-cooled parallel unit price, there may be a gap cylinder piston wear or individual valves deformation defects as a result of high and low strings gas. Condenser cooling unit's non-compliance may also result in decreased operating efficiency refrigeration units, specific performance is the condenser heat transfer area is not enough, aging, for the wind is not enough, fouling. Evaporator cooling capacity of non-compliance are also important factors efficiency of the unit, due to the evaporator heat transfer area is not enough, install a parallel evaporator cooling unit aging, hang frost, ice, oil and many other factors affect the internal heat transfer efficiency. In the cold winter, water-cooled parallel maintenance crew, influenced by climate and geography, the refrigeration unit easier instability and low efficiency of the situation. Usually in winter, low operating efficiency of fluorine is insufficient refrigeration units mainly for the fluid pressure is low due to condensation caused. In addition, the oil shortage caused by frequent start, may also result in reduced efficiency of the refrigeration unit. Water-cooled parallel units pictures, Shanxi Lung preservation, water-cooled parallel units provided by a county in Shanxi Lung Preservation Technology Development Company Limited. Shanxi Lung Preservation Technology Development Co., Ltd. (www.sxltbx.com) is Taiyuan, heat, refrigeration and air conditioning equipment leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customers needs. Lung preservation of leadership in Shanxi with the staff warmly welcome all inquiries negotiations to create the Shanxi Lung Preservation better future.