The particularity of large-sized test device for air-cooled heat pump unit, the difference from conventional test device in conception and emphasis are analysed, the key problems and solutions in the R & D process of large-sized test device for air-cooled heat pump unit are introduced, compositional components and their functions and realization methods of test device are described in detail.

Analyses measured results of air cooled heat pump units operating in Xi'an , gives some points for consideration in design, installation and adjustment.

The working principle of the air cooled heat pump unit is introduced and problems are brought forth when designing and choosing the unit,such as amending the cooling (heating) capacity of the unit in specific ambient temperature,choosing the cooling(heating) capacity of the unit and installing the unit.

The mathematical model of condenser of air-cooled heat pump was built.

Based on thermal economics the author analyses the air-cooled heat pump, and compared it with other cold (heat) sources.

Briefly gives an outline of the working theory of air-cooled heat pumps,and analyses the effect of ambient temperature in winter on heating capacity of these units .

Noise measurement and analysis of air cooled heat pump units and water chillers;

Comparison to the Primary Energy Efficiency Ratio (PER) under changed conditions between Direct Fired Absorption Chiller (DFAC) and electric driven Air Source Heat Pump Chiller (ASHP) is introduced.

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.