What kind of concerns is associated with temperature pinch points in condensers?

What kind of concerns is associated with temperature pinch points in condensers?
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1 Answer

Answer :

Be extra careful when condensers are designed with a small pinch point. A pinch point is the smallest  temperature difference on a temperature vs heat content plot that shows both streams. If the actual  pressure is less than the process design operating pressure, there can be a significant loss of heat  transfer. This is especially true of fluids that have a relative flat vapor pressure plot like ammonia or  propane. For example: If an ammonia condenser is designed for 247 PSIA operating pressure and the  actual pressure is 5 PSI less and the pinch point is 8 0F, there can be a 16% drop in heat transfer. Source:  Gulley Computer Associates
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