Discusses the application range, the technical characteris tics of small-sized air-source heat pump cooling(heating) unit,t he thermodynamic calculations of the unit cooling (heating) circle,the unit test installations,the test instruments,and the test results.

Energy-saving optimization operation under part load and performance analysis for air-cooled chillers;

Introduces the design of the air-cooled chiller in the transfer layer of the building or inside the building on the basic of the actual engineering.

Emphatically analyses the two issues in employing air-cooled chillers: the influence of electric current on refrigerating capacity and vibration and noise of chillers.

Application of air-cooled water chillers and some suggestions;

The project applies air-cooled water chillers with natural cooling function as cold source, and uses chilled water type air conditioning units dedicated for the device room.