| 摘要 |
<p>A method of monitoring a transport refrigeration system (20) which is effective regardless of the temperature of a served space (90) relative to a selected set point temperature (109). Different "windows" of acceptable and marginal performance are provided in the form of different minimum magnitudes of DELTA T (184,196,208,242,244,250), ie., 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 (202,260) to be generated for a marginal performance, and an early shut down (216,232,276,286) to be initiated for unacceptable performance. In one embodiment, a maximum value of DELTA T is also provided (306), which, if exceeded by the actual DELTA T, indicates a restricted air flow (318) in the cargo space. <IMAGE></p> |
