PULSE WIDTH MODULATION CONTROL FOR HEAT PUMP FAN TO ELIMINATE COLD BLOW
First Claim
1. A heat pump comprising:
- a compressor for compressing refrigerant and delivering the refrigerant to a downstream indoor heat exchanger, said indoor heat exchanger being provided with an air-moving device for moving air over said indoor heat exchanger and into an environment to be conditioned, refrigerant passing from said indoor heat exchanger through an expansion device and then through an outdoor heat exchanger, refrigerant from the outdoor heat exchanger returning to the compressor; and
a control for said air-moving device for said indoor heat exchanger, said control providing a pulse width modulation signal to adjust the time-average volume of air moved by said air-moving device over said indoor heat exchanger when it has been determined that there is insufficient heat rejected by said indoor heat exchanger to heat a nominal volume of air to a desired temperature.
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Accused Products
Abstract
A heat pump refrigerant system is provided with a pulse width modulation control for a fan moving air over the indoor heat exchanger. When it is determined that there is insufficient heat rejected by the indoor heat exchanger to heat the volume of air being delivered by the fan into the conditioned environment, the volume of air supplied to the conditioned environment is reduced by utilizing one of pulse width modulation techniques to cycle the indoor fan motor to reduce the average volume of supplied air. Therefore, a precise control over the temperature of air delivered to the conditioned space is achieved, temperature of the delivered air is increased to the target value, and so-called “cold blow” conditions are avoided.
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Citations
30 Claims
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1. A heat pump comprising:
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a compressor for compressing refrigerant and delivering the refrigerant to a downstream indoor heat exchanger, said indoor heat exchanger being provided with an air-moving device for moving air over said indoor heat exchanger and into an environment to be conditioned, refrigerant passing from said indoor heat exchanger through an expansion device and then through an outdoor heat exchanger, refrigerant from the outdoor heat exchanger returning to the compressor; and a control for said air-moving device for said indoor heat exchanger, said control providing a pulse width modulation signal to adjust the time-average volume of air moved by said air-moving device over said indoor heat exchanger when it has been determined that there is insufficient heat rejected by said indoor heat exchanger to heat a nominal volume of air to a desired temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of operating a heat pump comprising the steps of:
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(1) compressing refrigerant and delivering the refrigerant to a downstream indoor heat exchanger, indoor heat exchanger being provided with an air-moving device moving air over said indoor heat exchanger and into an environment to be conditioned, refrigerant passing from said indoor heat exchanger through an expansion device and then through an outdoor heat exchanger, refrigerant from the outdoor heat exchanger returning to the compressor; and (2) controlling said air-moving device for said indoor heat exchanger, by providing a pulse width modulation signal to adjust the time-average volume of air moved by said air-moving device over said indoor heat exchanger when it has been determined that there is insufficient heat rejected by said indoor heat exchanger to heat a nominal volume of air to a desired temperature. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification