Method of operating a transport refrigeration system having a six cylinder compressor
This patent describes a method of operating a transport refrigeration system having a six cylinder compressor, an evaporator, a condenser, and a prime mover operable in a selected one of high and low speeds, to control the temperature of a served space via cooling and hot gas heating modes above and below a predetermined set point, respectively, with the refrigeration system further including control means which changes its operating state at first and second predetermined temperatures, above and below the set point, respectively, to define a first temperature range above the first predetermined temperature, a second temperature range between the first predetermined temperature and the set point, a third temperature range from the set point to the second predetermined temperature, and a fourth temperature range below the second predetermined temperature. It comprises the steps of: operating the system in a two cylinder low speed heating mode when the temperature of the served space is in the third temperature range, switching from the two cylinder low speed heating mode to a two cylinder low speed cooling mode when the temperature of the served space changes from the third temperature range to the second temperature range, activating a predetermined timing period when the temperature of the served space changes from the third temperature range to the second temperature range, loading two additional cylinders of the compressor to operate in a four cylinder low speed cooling mode in response to either of the following two trigger conditions occurring before the temperature of the served space again enters the third temperature range; and switching from the four cylinder low speed cooling mode to a six cylinder high speed cooling mode in response to the remaining trigger condition occurring before the temperature of the served space again enters the third temperature range.
- Assignee:
- Thermo King Corp., Minneapolis, MN
- Patent Number(s):
- US 4735055
- OSTI ID:
- 5007498
- Resource Relation:
- Patent File Date: Filed date 15 Jun 1987
- Country of Publication:
- United States
- Language:
- English
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