Heat pump apparatus having refrigerant level indication and asso

Details Heat pump apparatus having refrigerant level indication and asso Heat pump apparatus having refrigerant level indication and asso

1997-10-27

2000-05-09

Tanner, Harry B.

Refrigeration

With indicator or tester

Condition sensing

62260, 62503, F25B 4902

Patent

active

060587199

ABSTRACT:
A heat pump apparatus maintains a desired constant amount of subcooling at an outlet of a condenser and a desired constant amount of superheat at an outlet of an evaporator, thereby requiring a charge defining level of refrigerant within a refrigerant storage container. A refrigerant level indicator is provided for indicating a level of liquid refrigerant to reside stored within the refrigerant container during operation of the heat pump. The superheat at an outlet of the evaporator is preferably controlled to be near zero degrees Fahrenheit so that the evaporator is fully flooded. Subcooling at an outlet of the condenser may also desirably be maintained at about zero degrees Fahrenheit. The refrigerant level indicator may be provided by a view port connected to the refrigerant container for permitting viewing of a level of liquid refrigerant. A liquid level sensor and associated display may also be used to indicate the level of refrigerant within the refrigerant container. Method aspects of the invention are also disclosed.

REFERENCES:
patent: 2215717 (1940-09-01), Rea
patent: 2873714 (1959-02-01), Bauerlein
patent: 3044574 (1962-07-01), Feguson
patent: 3153913 (1964-10-01), Brody
patent: 3191397 (1965-06-01), Kennedy
patent: 3987294 (1976-10-01), Carlson
patent: 4831843 (1989-05-01), Cochran
patent: 5136855 (1992-08-01), Lenarduzzi
patent: 5214918 (1993-06-01), Oguni et al.

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