Heat pump having impulse-width modulation controller

A technology of pulse width modulation and heat pump, which is applied in the direction of reversible cycle compressors, refrigerators, refrigeration components, etc., and can solve the problems that have not yet been introduced into heat pumps

Inactive Publication Date: 2009-01-07
CARRIER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While such pulse width modulated controllers provide sufficient performance variability for air conditioning systems, they have not been introduced to heat pumps so far

Method used

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  • Heat pump having impulse-width modulation controller
  • Heat pump having impulse-width modulation controller
  • Heat pump having impulse-width modulation controller

Examples

Experimental program
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Embodiment Construction

[0019] Figure 1A Shown is a heat pump refrigeration system 20 comprising a compressor 22 having a discharge line 23 supplying compressed refrigerant to a four-way reversing valve 26 . The four-way reversing valve 26 selectively connects the refrigerant from the discharge line 23 to the outdoor heat exchanger 24 when the system operates in the cooling mode, or connects the refrigerant from the discharge line 23 to the outdoor heat exchanger 24 when the system operates in the heating mode. Indoor heat exchanger 30. In either case, the refrigerant passes to the main expansion device 28 from the heat exchanger it first encounters after leaving the compressor. Refrigerant travels from the primary expansion device 28 up to the second heat exchanger and back to the four-way reversing valve 26 . The four-way reversing valve 26 sends the refrigerant along the pipeline to the suction pipeline 31 , and the suction pipeline returns to the compressor 22 . Here is a very simplified schem...

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Abstract

A heat pump is provided with a component that has a pulse width modulation control to adjust system capacity. Thus, by utilizing a pulse width modulation technique to control this component, the present invention is able to closely tailor the delivered capacity of the heat pump to that which is demanded, without cycling the unit. In one embodiment, the component has a suction pulse width modulation valve. In another embodiment, the component which is modulated is the compressor pump unit, and, in particular, a pair of scroll members that are allowed to move into and out of contact with each other. The pulse width modulation control device can also be utilized in combination with a heat pump having an economizer function and / or an unloader function.

Description

technical field [0001] The present invention relates to a heat pump operable in a cooling mode and a heating mode and wherein at least one component is controlled by a pulse width modulation technique to vary the capacity of the heat pump. Background technique [0002] Refrigeration systems are used to control the temperature and humidity of the air in various indoor environments to be conditioned. In a typical refrigeration system operating in cooling mode, the refrigerant is compressed in the compressor and sent to the condenser (or in this case the outdoor heat exchanger). In the condenser, heat is exchanged between the outside ambient air and the refrigerant. From the condenser the refrigerant is passed to an expansion device where it is expanded to a lower pressure and temperature before being passed to the evaporator (or indoor heat exchanger). In the evaporator, heat is exchanged between the refrigerant and the room air, thereby conditioning the room air. When the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B1/00F25B13/00F25B41/00F25B49/00
CPCF25B2400/23F25B2400/13F25B13/00F25B2313/02742F25B1/04F25B2600/2521F25B2600/0261F25B41/043F25B2313/02741F25B41/22
Inventor M·F·塔拉斯A·利夫森
Owner CARRIER CORP
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