Method of operating a transport refrigeration system

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

1992-03-27

1992-12-22

Tapolcai, William E.

Refrigeration

Processes

Circulating external gas

62160, 62229, 236 91F, F25D 1906

Patent

active

051725606

ABSTRACT:
A method of operating a transport refrigeration system having a compressor driven by a prime mover at a selected one of high and low speeds, an evaporator, and an evaporator blower driven by the prime mover. Refrigeration control provides an error value which controls the temperature of a load space to a predetermined set point via heating and cooling modes. The method includes the steps of driving the compressor at high speed during pull down, and injecting hot gas into the evaporator when the error is reduced to a predetermined value. The prime mover is maintained at high speed, to keep evaporator air flow at a high rate, continuing a relatively rapid temperature pull-down across the entire load space. The speed of the prime mover is reduced to low speed when the error is further reduced to a second value, which also initiates suction line modulation while maintaining hot gas injection.

REFERENCES:
patent: 3665725 (1972-05-01), Barless et al.
patent: 4742689 (1988-05-01), Lowes
patent: 4789025 (1988-12-01), Brandemuehl et al.
patent: 4899549 (1990-02-01), Berge et al.
patent: 4918932 (1990-04-01), Gustafson et al.

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