Microchannel gas cooler is an important component of transcritical carbon dioxid e refrigerating equipment

and of great significance to system performance. Howe ver

few investigations have been made on this new type of heat exchanger.A stea dy-state distributed-parameter model is established

in which distributed proper ties of both carbon dioxide and air are considered.Through comparing simulation re sults with experimental results from literatures of American Air Conditioning an d Refrigerating Center

the model is accepted with an error within 13%.Then this model is used for sensitivity analysis of gas cooler performance to its configu ration parameters

such as microchannel diameter

number of microchannels

numbe r of tubes

number of processes.According the simulation results

it is suggeste d that the microchannel diameter should be within 0.7 to 1mm

and there should be 2 to 4 processes.