May 2002

Heat Transfer/Reliability

Heat integration complicates heat pump troubleshooting

An engineering review discovered the root-cause of the problem, saving a considerable capital expenditure

Schneider, D. F., Stratus Engineering, Inc.

Anaphtha fractionator unit operated well for years but began to experience inexplicable warm weather trips of a heat pump compressor. During the summer, the compressor would shut down on high discharge temperature for no apparent reason. Feed rates were high but not beyond design. The initial thought was that the compressor driver was inadequate. The compressor driver was due for overhaul - it would be an opportune time to replace it with a higher-horsepower machine. Focusing on the compressor would be easy, and it might even be correct. Before an order for a new compressor driver was placed though, a detailed review of

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