The performance of a refrigeration system is affected by many factors

and cooling fan is one of the important factors. The distributor directly influences the heat transfer performance of the cooling fan

such as the iso-dryness and equal-flow distribution of refrigerant. In this experiment

a new type of premixed nozzle shunt (A) is designed

and a test bench is built to test the shunt performance. Improving the efficiency of the refrigeration system and saving energy are certainly significant. An R22 refrigerant was used in the experiment

and the design condition was a cold storage temperature of ?18 ℃. Experiments were carried out at 0

?4

?8

?12

?16

?18

and ?20 ℃ (cold storage temperature). The test results were compared with another nozzle shunt (B)

gas–liquid separation shunt (C)

CAL shunt (D)

and Venturi shunt (E). The comprehensive performance of the shunts followed the order from good to bad

i.e.

A > B > C > D > E. The overheat

inhomogeneity

heat transfer coefficient

and cooling capacity of A were better than those of the others. Adopting the A shunt reduced the fan heat transfer temperature difference and irreversible loss and improved the system performance.