Vapor compression system startup method

Details Vapor compression system startup method Vapor compression system startup method

2006-08-14

2009-02-17

Jiang, Chen-Wen (Department: 3744)

Refrigeration

Automatic control

Of external fluid or means

C062S238600, C236S02000A

Reexamination Certificate

active

07490481

ABSTRACT:
A method of controlling a startup operation in a heat pump water heater system prevents inadvertent shutdowns and/or low operating efficiencies via closed loop control of the system. The method includes choosing an expansion valve opening at startup near an expected steady state value to ensure high system capacity as early as possible, setting a water pump signal to a high level to maximize cycle efficiency during warm-up, and applying closed loop control over the expansion valve and the water pump to increase the pressure in the system in a controlled manner until the system reaches a steady operating state. The method provides stable startup control even if a transcritical vapor compression system is used as the heat pump.

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