Variable Speed Compressor Protection System And Method
First Claim
1. A system comprising:
- a compressor connected to a condenser;
a discharge line temperature sensor that outputs a discharge line temperature signal corresponding to a discharge line temperature of refrigerant leaving the compressor;
a control module connected to the discharge line temperature sensor, said control module determining a saturated condenser temperature, calculating a discharge superheat temperature based on the saturated condenser temperature and the discharge line temperature, monitoring a flood back condition of the compressor by comparing the discharge superheat temperature with a predetermined threshold, and, when the discharge superheat temperature is less than or equal to the predetermined threshold, increasing a speed of the compressor or decreasing an opening of an expansion valve associated with the compressor.
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Accused Products
Abstract
A system and method for a compressor includes a compressor connected to a condenser, a discharge line temperature sensor that outputs a discharge line temperature signal corresponding to a discharge line temperature of refrigerant leaving the compressor, and a control module connected to the discharge line temperature sensor. The control module determines a saturated condenser temperature, calculates a discharge superheat temperature based on the saturated condenser temperature and the discharge line temperature, and monitors a flood back condition of the compressor by comparing the discharge superheat temperature with a predetermined threshold. The control module increases a speed of the compressor or decreases an opening of an expansion valve associated with the compressor when the discharge superheat temperature is less than or equal to the predetermined threshold.
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Citations
20 Claims
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1. A system comprising:
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a compressor connected to a condenser; a discharge line temperature sensor that outputs a discharge line temperature signal corresponding to a discharge line temperature of refrigerant leaving the compressor; a control module connected to the discharge line temperature sensor, said control module determining a saturated condenser temperature, calculating a discharge superheat temperature based on the saturated condenser temperature and the discharge line temperature, monitoring a flood back condition of the compressor by comparing the discharge superheat temperature with a predetermined threshold, and, when the discharge superheat temperature is less than or equal to the predetermined threshold, increasing a speed of the compressor or decreasing an opening of an expansion valve associated with the compressor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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determining, with a control module, a saturated condenser temperature of a condenser connected to a compressor; receiving, with the control module, a discharge line temperature signal that corresponds to a discharge line temperature of refrigerant leaving the compressor; calculating, with the control module, a discharge superheat temperature based on the saturated condenser temperature and the discharge line temperature; monitoring, with the control module, a flood back condition of the compressor by comparing the discharge superheat temperature with a predetermined threshold; and increasing a speed of the compressor or decreasing an opening of an expansion valve, with the control module, when the discharge superheat temperature is less than or equal to the predetermined threshold. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification