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Pulse width modulation control for heat pump fan to eliminate cold blow

A technology of pulse width modulation and heat pump, applied in the field of heat pump

Inactive Publication Date: 2010-08-18
CARRIER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pulse width modulation control has not been used to solve the "cold blow" problem mentioned above

Method used

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  • Pulse width modulation control for heat pump fan to eliminate cold blow
  • Pulse width modulation control for heat pump fan to eliminate cold blow
  • Pulse width modulation control for heat pump fan to eliminate cold blow

Examples

Experimental program
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Embodiment Construction

[0014] Figure 1 shows a refrigeration system 20 comprising a compressor 22 delivering refrigerant to a discharge line 23 and through a four-way valve 24 (there is no need for a four-way valve if the heat pump is dedicated to heating applications only) to the indoor heat exchanger. Heater 26. Downstream of the indoor heat exchanger 26 , the refrigerant passes through an expansion device 28 and then to an outdoor heat exchanger 30 . The outdoor heat exchanger 30 is provided with a fan 32 for moving air across the outer heat transfer surface of the outdoor heat exchanger 30 . Downstream of the outdoor heat exchanger 30 , the refrigerant again passes through the four-way valve 24 and enters the suction line 33 , which sends the refrigerant back into the compressor 22 . The refrigeration system 20 shown in FIG. 1 is in a heating operation mode. The refrigeration system can be turned on by switching the four-way valve 24 and sending the refrigerant from the discharge line 23 first...

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PUM

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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.

Description

technical field [0001] The present application relates to a heat pump in which a fan used to move air into a conditioned environment is pulse width modulated controlled to solve the problem of "cold blow". Background technique [0002] Heat pumps are known in the art and are used to provide cooling to a conditioned environment during periods of hot weather or creating excessive internal heat loads, or to supply heat to the same indoor environment when the weather is cold. Furthermore, more simplistic heat pump designs are known, which are able to work only in heating mode. Heat pumps have great potential in providing efficient conditioning to indoor environments, but there are obstacles to their use. [0003] A known problem with existing heat pump designs is so-called "cold blow". "Cold blow" occurs when the heat pump does not have enough heat removal capacity to adequately heat the air being driven into the environment to be conditioned. [0004] When this phenomenon oc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B13/00
CPCF25B2313/0293F25B13/00F25B2313/0314F25B2313/02741
Inventor A·利夫森M·F·塔拉斯
Owner CARRIER CORP