Method of operating a transport refrigeration system

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

1992-02-10

1992-11-10

Tanner, Harry B.

Refrigeration

With indicator or tester

Operatively correlated with automatic control

62130, 62158, 340585, F25B 4900

Patent

active

051613840

ABSTRACT:
A method of monitoring a transport refrigeration system which is effective regardless of the temperature of a served space relative to a selected set point temperature. Different "windows" of acceptable and marginal performance are provided in the form of different minimum magnitudes of .DELTA.T, i.e., the algebraic difference between the return and discharge air temperatures, as a function of ambient and return air temperatures. The transport refrigeration system is thus monitored at all times, during both cooling and hot gas heating modes, and also including during initial temperature pull down of the cargo space, enabling an early warning to be generated for a marginal performance, and an early shut down to be initiated for unacceptable performance. In a preferred embodiment, a maximum value of .DELTA.T is also provided, which, if exceeded by the actual .DELTA.T, indicates a restricted air flow in the cargo space.

REFERENCES:
patent: 4211089 (1980-07-01), Mueller et al.
patent: 4232530 (1980-11-01), Mueller
patent: 4395886 (1983-08-01), Mayer
patent: 4407141 (1983-10-01), Paddock
patent: 4493191 (1985-01-01), Hanson
patent: 4790143 (1988-12-01), Hanson
patent: 4949550 (1990-08-01), Hanson

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