초록 ▼

An electronic expansion valve (EXV) used in a refrigeration cycle for a heat pump or chiller is controlled to maintain minimum pinch for ensuring proper flooded cooler exchange performance by monitoring the delta temperature between the cooler fluid and the saturated suction temperature. The dischar

An electronic expansion valve (EXV) used in a refrigeration cycle for a heat pump or chiller is controlled to maintain minimum pinch for ensuring proper flooded cooler exchange performance by monitoring the delta temperature between the cooler fluid and the saturated suction temperature. The discharge superheat is monitored to protect the compressor from liquid slugging. If the discharge superheat is lower than the expected value, the EXV opening is adjusted. A controller monitors certain system variables which are used to determine the optimal position of the EXV to optimize the system performance, the proper discharge superheat value, and the appropriate refrigerant charge.

대표청구항 ▼

[ We claim:] [1.]1. A method for controlling an electronic expansion valve in a refrigerant cycle system, comprising the steps of:ensuring proper flooded cooler exchange performance by monitoring a change in temperature between a fluid in said cooler and a saturated suction temperature of said syste

[ We claim:] [1.]1. A method for controlling an electronic expansion valve in a refrigerant cycle system, comprising the steps of:ensuring proper flooded cooler exchange performance by monitoring a change in temperature between a fluid in said cooler and a saturated suction temperature of said system;protecting a compressor of said system by monitoring a discharge superheat of said system; andcorrecting a size of an opening of said electronic expansion valve when said discharge superheat is lower than a predetermined value.