R134A suction line heat exchanger in different configurations of automotive air-conditioning systems

摘要

A suction line heat exchanger (SLHX) transfers heat from the condenser outlet to the suction gas. In a TXV (thermostatic expansion valve) system, the performance improvement with a 60 to 80% effective SLHX is expected to be on the order of 8 to 10% for capacity, and 5 to 7% for COP for high outdoor air temperatures of 43°C. In a FOT (fixed orifice tube) system, the performance improvement was calculated to be about 10 to 15%. The calculated improvements have been verified experimentally within a few percent.