Abstract: In VRF air conditioning system, efficient heat dissipation directly determines the overall performance and compactness of the machine. Compared with traditional finned heat exchangers, refrigerant radiators are increasingly becoming the preferred choice for electronic control modules, especially IPM cooling solutions, due to their excellent heat dissipation efficiency, stable heat dissipation performance, and low sensitivity to environmental temperature changes. To accurately quantify its performance, conducted an in-depth analysis of a refrigerant radiator applied to practical products through a combination of theoretical modeling and experimental testing, measured the overall thermal resistance of the refrigerant during cooling, revealed the distribution of its internal thermal resistance through measurement. Based on this data, propose three optimization schemes, which provide reference technical paths for the design of next-generation high-power density and high reliability multi split products.

Key words: VRF, Refrigerant radiator, Optimization