CONTROL SYSTEM FOR OPERATING CONDENSER FANS
First Claim
1. A refrigeration system comprising:
- a variable capacity compressor system configured to compress refrigerant;
a condenser configured to receive and to condense the compressed refrigerant;
an expansion device configured to expand the condensed refrigerant;
an evaporator configured to evaporate the expanded refrigerant prior to returning the refrigerant to the variable capacity compressor system;
one or more fans driven by a fan drive and configured to displace air over the condenser;
a means for determining a discharge pressure of the variable capacity compressor system; and
a controller operatively coupled to the fan drive and configured to regulate the fan drive based on an operational capacity of the variable capacity compressor system when the discharge pressure is within a predetermined range and to regulate the fan drive based on the discharge pressure when the discharge pressure is outside of the predetermined range.
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Accused Products
Abstract
Methods and systems for controlling the operation of condenser fans are provided. At most discharge pressures, the operation of the condenser fans may be controlled based on a capacity of the compressor system. To adjust operation of the condenser fans, the speed of the fans and/or the number or operational fans may be adjusted. The control of the condenser fans based on compressor system capacity may be overridden at compressor discharge pressures that rise above a high pressure level and fall below a low pressure level. At the high and low discharge pressures, the fan speed and/or number of operating fans may be adjusted based solely on the discharge pressure rather than on the compressor system capacity.
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Citations
20 Claims
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1. A refrigeration system comprising:
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a variable capacity compressor system configured to compress refrigerant; a condenser configured to receive and to condense the compressed refrigerant; an expansion device configured to expand the condensed refrigerant; an evaporator configured to evaporate the expanded refrigerant prior to returning the refrigerant to the variable capacity compressor system; one or more fans driven by a fan drive and configured to displace air over the condenser; a means for determining a discharge pressure of the variable capacity compressor system; and a controller operatively coupled to the fan drive and configured to regulate the fan drive based on an operational capacity of the variable capacity compressor system when the discharge pressure is within a predetermined range and to regulate the fan drive based on the discharge pressure when the discharge pressure is outside of the predetermined range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A refrigeration system comprising:
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a variable capacity compressor system of one or more variable speed compressors configured to compress refrigerant; a condenser configured to receive and to condense the compressed refrigerant; an expansion device configured to expand the condensed refrigerant; an evaporator configured to evaporate the expanded refrigerant prior to returning the refrigerant to the variable capacity compressor system; one or more fans driven by a fan drive and configured to displace air over the condenser; a means for determining a discharge pressure of the variable capacity compressor system; and a controller operatively coupled to fan drive and configured to regulate the fan drive based on a rotational speed of the one or more variable speed compressors when the discharge pressure is within a predetermined range and to regulate the fan drive based on the discharge pressure when the discharge pressure is outside of the predetermined range. - View Dependent Claims (11, 12, 13, 14)
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15. A method of operating a refrigeration system, the method comprising:
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determining an operational capacity of a compressor system; determining a discharge pressure of the compressor system; controlling operation of one or more condenser fans based on the operational capacity when the discharge pressure is within a predetermined range; and controlling operation of the one or more condenser fans based on the discharge pressure when the discharge pressure is outside of the predetermined range. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification