Heat pump with capillary tube-type expansion device

Details Heat pump with capillary tube-type expansion device Heat pump with capillary tube-type expansion device

1985-05-21

1986-01-14

King, Lloyd L.

Refrigeration

Automatic control

Selective heating or cooling

62222, 623241, 623246, 62504, F25B 1300

Patent

active

045638799

ABSTRACT:
A heat pump employing a capillary tube as an expansion device is disclosed. The main throttle portion of the heat pump comprises a main capillary tube and a by-pass through which a portion of the refrigerant flows and cools the refrigerant flowing through the main capillary tube. A solenoid valve for controlling the flow of refrigerant through the main capillary tube is connected to the intake of the main capillary tube, and an electrical expansion valve is connected to the intake of the by-pass for controlling the flow therethrough. An auxiliary capillary tube for cooling and an auxiliary capillary tube for heating are connected in parallel with the main throttle portion, both capillary tubes having a higher resistance to flow than the main capillary tube. The auxiliary capillary tubes increase the range over which control of the flow of refrigerant can be achieved, allowing both a smaller flow of refrigerant during under minimum cooling or heating load as well as a larger flow of refrigerant under maximum cooling or heating load.

REFERENCES:
patent: 3264837 (1966-08-01), Harnish
patent: 3421337 (1969-01-01), Johannsen
patent: 3677028 (1972-07-01), Raymond
patent: 3884663 (1975-05-01), Funaro
patent: 4373353 (1983-02-01), Anzalone

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