The energy consumption of the system was evaluated with the concept"HEER".

According to the working principal of the system in summer, the "HEER" is introduced to judge the energy cost performance of the DVM sy.

The concept "HEER" is introduced to judge the energy cost performance of the digital system.

Using condensation water of split air-conditioning to raise energy efficiency ratio;

Obtains the changing range of sewage temperature,the actual energy efficiency ratio of heat pump system and the inlet and outlet temperatures of evaporator and condenser in winter by monitoring a sewage source heat pump system in Tianjin.

The experimental analysis shows that when the compound condensation technology is used,the condensation heat is fully used to heat domestic hot water,the energy waste and thermal pollution are reduced,and the condensation efficiency and energy efficiency ratio are improved while the operation of units for.

Study on the development trend of EER of air-conditioning;

Usually many kind of test bench were used to test the performance of water chiller such as the capacity,power consumption,EER,water flow etc.

Basing on application and experimental research, this article discusses the way of choosing part and improving EER in R410A system.

On the base of study on the effects of varibale factor son the cooling machine,the prototype was been manufactured and investigated,the experimental results showed that the increase of colling capacity by 9% and COP by 13% was realized.

The results indicate that, due to effective utilization of different gradeheat energy and reduction of irreversible loss, a COP improvement of 19% and 58%, respectively over conventional compression system with R22 as working fluid an.

And in order to obtain the key point of the energy efficiency performance-COP,a test system was set up in a house located in the urban area of Chongqing.