Method of operating a transport refrigeration system having a si

Details Method of operating a transport refrigeration system having a si Method of operating a transport refrigeration system having a si

1987-06-15

1988-04-05

Tanner, Harry B.

Refrigeration

Processes

Compressing, condensing and evaporating

62175, 621962, 622284, 622285, 236 1EA, F25B 4900

Patent

active

047350555

ABSTRACT:
A method of operating a transport refrigeration system having a six cylinder compressor and a prime mover operable at a selected one of low and high speeds, to control the temperature of a served space by cooling and hot gas heating modes. Below a set point temperature 100, system heating capacity is controlled at the low compressor speed by the step 127 of unloading compressor cylinders and the step 129 of reloading compressor cylinders. A temperature rise of the served space above a set point temperature 106 controls cooling capacity by a combination of alternative steps 135, 137, 139, 141, and 143 which may or may not change the number of loaded compressor cylinders, and may or may not change compressor speed, based upon two predetermined trigger events which relate to what the temperature of the served space does relative to time 136 and 142, a set point temperature 106, and a temperature 108 above set point which is normally associated with a change in compressor speed.

REFERENCES:
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patent: 4353221 (1982-10-01), Taylor
patent: 4356961 (1982-11-01), Smith
patent: 4384462 (1983-05-01), Overman et al.
patent: 4485634 (1984-12-01), Yasuda et al.

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