Control of refrigeration system to optimize coefficient of performance
AssigneeCarrier Corporation
InventorsYu Chen, Lili Zhang
Life of this patent
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Abstract
A refrigeration system includes a compressor, a gas cooler, an expansion device, and an evaporator. Refrigerant is circulated though the closed circuit system. Preferably, carbon dioxide is used as the refrigerant. As carbon dioxide has a low critical point, systems utilizing carbon dioxide as a refrigerant usually require the refrigeration system to run transcritical. When the system is operating inefficiently, the system is modified so the system operates efficiently. First, a parameter of the system is monitored by a sensor and the then compared to a stored value to determine if the system is operating inefficiently. If the system is operating inefficiently, the system is modified to an efficient system.
Claims19
A method of optimizing a coefficient of performance of a refrigeration system comprising the steps of:
- compressing a refrigerant to a high pressure in a compressor device;
- cooling said refrigerant in a heat rejecting heat exchanger;
- expanding said refrigerant to a low pressure in an expansion device;
- evaporating said refrigerant in a heat accepting heat exchanger;
- sensing a parameter of said refrigeration system;
- comparing said parameter to an efficiency parameter representative of an efficient refrigeration system;
- determining a state of efficiency of the refrigeration system based on the step of comparing;
- and
- adjusting said refrigeration system if the step of determining said state of efficiency determines that the refrigeration system is operating at an inefficient state to optimize the coefficient of performance.
A method of optimizing a coefficient of performance of a refrigeration system comprising the steps of:
- compressing a refrigerant to a high pressure in compressor device;
- cooling said refrigerant in a heat injecting heat exchanger;
- expanding said refrigerant to a low pressure in an expansion device;
- evaporating said refrigerant in a heat accepting heat exchanger;
- sensing a parameter of said refrigeration system, wherein said parameter is a temperature difference between refrigerant temperature of said refrigerant exiting said heat rejecting heat exchanger and a fluid temperature of a fluid entering said heat rejecting heat exchanger that exchanges heat with said refrigerant in said heat rejecting heat exchanger;
- comparing said parameter to an efficiency parameter representative of an efficient refrigeration system;
- determining a state of efficiency of the refrigeration system;
- and
- adjusting said refrigeration system if the step of determining said state of efficiency determines that the refrigeration system is operating at an inefficient state.
A transcritical refrigeration system comprising:
- a compression device to compress a refrigerant to a high pressure;
- a heat rejecting heat exchanger for cooling said refrigerant;
- an expansion device for reducing said refrigerant to a low pressure;
- a heat accepting heat exchanger for evaporating said refrigerant;
- a sensor to sense a parameter of the refrigerant system;
- and
- a control that stores an efficiency value of said parameter representative of an efficient state of the refrigeration system, compares said efficiency value to said parameter to determine a state of efficiency the refrigeration system, and adjusts the refrigeration system if the refrigeration system is determined to be operating in an inefficient state to optimize a coefficient of performance of the system.
Dependencies are inferred from the claim text.