Abstract:

Two-stage vapor compression refrigeration cycle was accomplished with an intercooler.The state of the refrigerant vapor leaving the intercooler affects the system performance.The thermodynamic analysis of the trans-critical two-stage refrigeration cycle using CO₂ as the refrigerant was made with a condensing temperature of 35℃.When the intercooler operated at about the geometric mean of the evaporating and condensing pressures，compared with the single stage cycle，the coefficient of performance（COP）of the two-stage cycle was improved.As the degree of superheating of the CO₂ vapor leaving the intercooler increased，the COP of the two-stage system decreased.