Refrigeration – With indicator or tester – Condition sensing
Patent
1991-03-05
1992-08-11
Bennet, Henry A.
Refrigeration
With indicator or tester
Condition sensing
62174, 623244, 62503, 62260, G01K 1300
Patent
active
051368552
ABSTRACT:
A ground source heat pump comprising an indoor coil circuit and an outdoor coil circuit utilizes a scroll compressor to pressurize the refrigerant. The outdoor coil may comprise ground coils formed from copper tubing into a spiral configuration. A charge control device controls the volume of refrigerant in the system in heating and cooling modes. A restrictor in parallel with a thermal expansion valve permits a base flow of refrigerant into the outdoor coil in heating mode. An accumulator is provided with a level switch controlling a solenoide value connected in parallel to a thermal expansion value feedig the indoor coil. The scroll compressor includes a discharge port operating in conjunction with a solenoid valve to trap high pressure refrigerant in the condenser circuit during compressor off cycles. Means for closing off one of the ground coils to reduce the effective length of the outdoor coil is provided.
REFERENCES:
patent: 1880653 (1932-10-01), Boars
patent: 2112039 (1938-03-01), McLenegan
patent: 3600904 (1971-08-01), Tilney
patent: 4730465 (1988-03-01), Inoue
patent: 4774816 (1988-10-01), Uchikawa et al.
Bennet Henry A.
Ontario Hydro
Sollectto John
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