The refrigeration system is of multi-input and multi-output

in which many operating parameters are related . With the change of environment and indoor heat load

the refrigeration and air-conditioning system almost operate at varying condition. In order to study the actual performance of the system

a frequency adjustment vapor compressor refrigeration and air-conditioning experiment system with integrative multi-loop control is developed

where the air loops between evaporator and condenser are able to simulate the actual work condition

such as variation of environmental temperature

humidity and indoor heat load at any time by adjusting valves in loop. The paper presents design principle

technical parameters

regulating method and data acquisition system. Not only the dynamic relation characteristics among multi- parameters of refrigeration system can be obtained in the experimental system

but also the performance test of single equipment and the comparison among different control methodologies can be carried out. The results provide the experimental basis for dynamic simulation

match among every equipment in the refrigeration cycle and optimize operation control methods.