Air-to-air heat pump defrost bypass loop

Details Air-to-air heat pump defrost bypass loop Air-to-air heat pump defrost bypass loop

2006-02-28

2006-02-28

Ciric, Ljiljana (Department: 3753)

Heat exchange

With timer, programmer, time delay, or condition responsive...

Temperature responsive or control

C165S267000, C165S291000, C062S151000, C062S155000, C062S324500

Reexamination Certificate

active

07004246

ABSTRACT:
An improvement in defrosting an air-to-air heat pump system when in the heating mode. A bypass loop transfers refrigerant at a higher temperature and pressure than is normally cycled through the outdoor unit to an outdoor coil to defrost ice on the outdoor coil, The bypass loop includes a valve movable between closed and open positions. A sensor monitors a preselected condition indicative of outdoor coil performance. A controller communicates with the valve and the sensor. Once the controller determines that a preselected set point of a preselected condition indicative of deteriorating performance has been reached, based on received sensor signals, the controller sends a signal to open the valve, allowing warm refrigerant to bypass expansion valves and flow to the outdoor unit to defrost the outdoor unit. Once defrosting is accomplished, the valve can be moved to a closed position to resume normal operation of the heat pump unit.

REFERENCES:
patent: 4158950 (1979-06-01), McCarty
patent: 4178767 (1979-12-01), Shaw
patent: 4338790 (1982-07-01), Saunders et al.
patent: 4353409 (1982-10-01), Saunders et al.
patent: 4389851 (1983-06-01), Chrostowski et al.
patent: 4406133 (1983-09-01), Saunders et al.
patent: 4407137 (1983-10-01), Hayes, Jr.
patent: 4441335 (1984-04-01), Bonne
patent: 4519214 (1985-05-01), Sano et al.
patent: 4553401 (1985-11-01), Fisher
patent: 4554968 (1985-11-01), Haas
patent: 4573326 (1986-03-01), Sulfstede et al.
patent: 4628706 (1986-12-01), Neudorfer
patent: 4760709 (1988-08-01), Aoki et al.
patent: 4770000 (1988-09-01), Kuroda et al.
patent: 4796437 (1989-01-01), James
patent: 4802339 (1989-02-01), Gregory
patent: 4835715 (1989-05-01), Bench et al.
patent: 4843838 (1989-07-01), Trask
patent: 4852360 (1989-08-01), Harshbarger et al.
patent: 4882908 (1989-11-01), White
patent: 4912937 (1990-04-01), Nakamura et al.
patent: 5025640 (1991-06-01), Drucker
patent: 5105629 (1992-04-01), Parris et al.
patent: 5186021 (1993-02-01), Keller
patent: 5257506 (1993-11-01), DeWolf et al.
patent: 5269151 (1993-12-01), Dinh
patent: 5275008 (1994-01-01), Song et al.
patent: 5309733 (1994-05-01), Hayashida et al.
patent: 5729985 (1998-03-01), Yoshihara et al.
patent: 5758507 (1998-06-01), Schuster et al.
patent: 5839292 (1998-11-01), Hwang
patent: 5983660 (1999-11-01), Kiessel et al.
patent: 6012294 (2000-01-01), Utsumi
patent: 6615602 (2003-09-01), Wilkinson

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