China has officially implemented in 2005, "energy efficiency chillers limited value and energy efficiency rating" (GB19577-2004) national standards, let us concern about the standards of the background, key data indicators and standards after the implementation of some feedback. 
     China's rapid economic development, refrigeration and cryogenic technology in all areas of society in an increasingly wide range of applications, large refrigeration unit with its large cooling capacity, efficiency and concern, has developed rapidly. Chiller evaporator production by 6 ℃ of chilled water for the main purpose of most of the condenser cooling water, a small number of the air-cooled or evaporative cooling. Units in cold water, the screw centrifugal chiller plants and cooling capacity due to large, high efficiency, wide range of compact structure, small gas by oil pollution, as well as the smooth functioning of the normal conditions, the pulse of compressed air and many other advantages of small and large-scale Refrigeration is widely used sites and become an important industry of refrigeration products. Figure 1 gives the output of China's changes in chillers. (Note: in 2003 air-cooled units hot and cold water in a screw merge, piston-style hot and cold water units and residential central air-conditioning units hot and cold water in three.)

     Advanced or backward?

     Through the nearly three years of discussion and preparation, China's "energy efficiency chillers limit value and energy efficiency rating" (GB19577-2004) has been promulgated and implemented, including the main technical indicators shown in Table 1. 5 which is the limit value of energy efficiency, that is, the minimum value; 1 and 2 is the energy efficiency of the energy value of the relevant documents have been provided for government procurement of products necessary to achieve energy-saving value.

     Table 2 gives the energy efficiency rating the United States, the table data is the minimum requirement, there is no foreign products on the classification of chillers. From Table 1, Table 2, we can see that the United States level of energy efficiency is more stringent than the Chinese. China and the world still a wide gap between the advanced level.

     Standards after the enactment of the feedback

     In view of chillers in China is still relatively low level of overall manufacturing, uneven technical level of all manufacturers, the new energy efficiency standards in line with the purposes and standards of China's basic national conditions. According to the manufacturing plant to publish or test data, after the enactment of new standards for energy efficiency chillers in China's overall good performance, a joint venture production plant in the basic one and two levels, the domestic large assembly plant products 3 or 4 levels, part of Group products factory installed to achieve the level of 5. As a result of steel, copper prices, enterprises are facing greater cost pressures, in highly efficient at the same time minimizing the consumption of raw materials, the technology necessary to achieve higher efficiency.

     In foreign countries, companies have done a better self-discipline, mutual supervision between enterprises and found that the phenomenon of false competitors, can be reported. Trade associations in regulatory and self-regulation also play an important role. In China, however, the enterprise as a result of self-reported levels of energy efficiency regulation is still not perfect (not necessarily abroad for China's national conditions), but also a "virtual gap" phenomenon. Individual enterprises or logo in the product samples have deliberately exaggerated the product or level of energy efficiency indicators of the phenomenon, has attracted the attention of management.

     Technically speaking, the new energy efficiency standards are not perfect. Range of cooling capacity in the first paragraph as an example to cut-off point analysis 528kW. Q ≤ 528kW cooling capacity of the unit, such as a water-cooled chillers 520kW, the EER value of 4.6, by the new energy efficiency standards, we can see that this unit are three levels of energy efficiency, from a technical perspective, EER can only need to raise 0.1 to achieve two levels of energy efficiency; Q ≥ 528kW cooling capacity of the unit, such as water-cooled chillers 530kW to the same technology to produce standard, 530kW and 520kW unit EER of nearly the same as the assumptions in this 530kW water-cooled chillers EER value of 4.6, by the new energy efficiency standards, we can see that this unit standard are four, from a technical perspective, the EER to be achieved in three energy efficiency standards need to be at least 0.1, to achieve energy efficiency standards at level 2 at least 0.5. In this way, the capacity between 400kW ~ 528kW (1) and capacity of 1000kW ~ 1163kW (3 above) between the chillers and the capacity of 528kW ~ 630kW (2) and the capacity of 1163kW ~ 1300kW (4 above) between the phase of chillers compared more easily improve the energy efficiency rating. This will enable manufacturers to be more willing to produce between 1,3-capacity chillers paragraph rather than paragraph production capacity of between 2,4 chillers is not conducive to the diversification of products and can not better meet the needs of various customers requirements, is not conducive to the promotion of chiller technology industry as a whole (see Figure 2). Therefore, the new energy efficiency standards where there is unreasonable, it is necessary to conduct an in-depth analysis of this study to a more reasonable under the energy efficiency standard-setting technical preparations to do.

     Development Trend of chillers

     Energy-saving and environmental protection standards in the situation, driven by the development of chillers emerging trends are as follows: First, to the very large capacity, such as Trane production capacity of 5000kW; with the highest efficiency tends to have EER of the unit 7. The second is the development of small-scale, such as the 500kW cooling capacity, high-speed, magnetic bearing, the future may replace the screw machine. Third, semi-closed unit with the open-unit competing against each other, have achieved a higher performance. Finally, in regard to energy efficiency, use R123 refrigerant efficiency will enable the unit 5% ~ 7%; motor direct drive, running fewer parts, high reliability, reduce energy loss of 2% ~ 4%; unit voltage may be in the high-pressure between the options, the use of low-pressure refrigerant unit, greatly reducing the possibility of refrigerant leakage; equipped with an advanced controller, it will be convenient and effective system to achieve energy-saving programs.

     China's "energy efficiency chillers limit value and energy efficiency rating" (GB19577-2004) standards promulgated by the promotion of energy-efficient chillers products and technological progress has played an important role in promoting. With the implementation of standards, new technology applications, industries will gradually phase into the norm.