With the development of human economy, central air conditioning is used more and more widely. Central air conditioning not only satisfies human life and production, but also brings huge energy consumption. In the early design of the central air conditioning system configuration is too large, the degree of intelligence is low, the design of the central air conditioning system only from the point of view of use, rarely from the perspective of energy conservation, this situation undoubtedly increased the energy consumption of the central air conditioning system. Under the circumstances of increasing tense of energy, "energy conservation and emission reduction" has become the common mission and responsibility of the world. According to statistics, in the industrial field that needs to use central air-conditioning system to meet the production needs, the energy consumption of central air-conditioning system accounts for 20-30% of the energy consumption of the factory, the energy consumption of central air-conditioning system in the building field accounts for 50-60% of the energy consumption of the entire building, and the energy consumption of the cold source station room accounts for 50-60% of the energy consumption of the entire central air-conditioning system. Therefore, the energy saving of central air conditioning cold and heat source station is of great significance.

Energy efficiency evaluation index of refrigeration room: EER of annual operation

Power consumption equipment includes water chillers, chilled water pump, cooling pump and cooling tower.

Refrigerating room EER (Annual average)= Annual Total cooling capacity (kWhc)/ Annual Total Electricity (kWhe)

High efficiency refrigeration room energy efficiency target:

Annual average refrigeration room system EER (Average annual comprehensive energy efficiency):

EER reach the 5.0 or better (means less than 0.7 kW/RT)