System and method for monitoring compressor floodback

摘要

A system and method for monitoring a floodback condition includes a compressor connected to a condenser, a discharge sensor that outputs a discharge temperature signal corresponding to a discharge temperature, and a control module connected to the discharge sensor. The control module receives compressor power data or compressor current data, determines a saturated condensing temperature based on the compressor power data or compressor current data, calculates a discharge superheat temperature based on the saturated condensing temperature and the discharge temperature, monitors a floodback condition of the compressor by comparing the discharge superheat temperature with a threshold, and, when the discharge superheat temperature is less than or equal to the threshold, increases the speed of the compressor or decreases an opening of an expansion valve associated with the compressor.

主权项

1. A system comprising:
a compressor connected to a condenser; a discharge sensor that outputs a discharge temperature signal corresponding to a discharge temperature of refrigerant from the compressor; and a control module connected to the discharge sensor, said control module being configured to receive at least one of compressor power data and compressor current data, determine a saturated condensing temperature based on a speed of the compressor and at least one of the compressor power data and the compressor current data, calculate a discharge superheat temperature based on the saturated condensing temperature and the discharge temperature, monitor a floodback condition of the compressor by comparing the discharge superheat temperature with a threshold, and, when the discharge superheat temperature is less than or equal to the threshold, increase the speed of the compressor or decrease an opening of an expansion valve associated with the compressor.