Refrigeration – With indicator or tester – Condition sensing
Patent
1978-09-28
1980-08-19
Wayner, William E.
Refrigeration
With indicator or tester
Condition sensing
236 94, 165 11R, G01K 1300, G05D 2300
Patent
active
042177618
ABSTRACT:
A device for measuring the relative efficiency of a heat pump whose design efficiency increases in proportion to the outdoor temperature. Temperature sensitive diodes connected to a differential amplifier are inserted in the return air stream and supply air stream of a heat pump in order to measure the air temperature increase across the indoor coil. A third temperature sensitive diode connected to a second differential amplifier is placed outdoors in order to measure the outdoor temperature. The outputs of the first two differential amplifiers are combined and then subtracted from a fixed value signal by a third amplifier in order to produce an output which is proportional to the relative efficiency of the heat pump at the outdoor temperature.
REFERENCES:
patent: 2305769 (1942-12-01), Germer
patent: 3499297 (1970-03-01), Raff et al.
patent: 3707851 (1973-01-01), McAshan, Jr.
patent: 3913344 (1975-10-01), Holloway et al.
Cornaire James L.
Crabbs Phillip R.
Tanner Harry
Wayner William E.
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