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We have been asked to provide design and cost estimates for 270TR of -40F ammonia refrigeration for a series of large blast freezer cells. Requirement: Do so with lowest ammonia charge possible (less than 500 pounds in any case, to fall below CalARP inclusion threshold minimum). Four (4) 70TR...

Compositepro, Yes, about 5 hp per 100 tons.

Frick rates their screw compressors down to -80F. Not the best eff there, but interesting to know.

The VFD 2900 RPM motor idea is a good one if your operating conditions allow you to back down while maintaining sufficient cooling performance,

COPs for the industrial systems run from about 0.2 @ -40 to 0.7 @ 40F. I should have noticed the topic was small enriched AAR.

Compositepro's observation about not going into a vacuum is a good one. This would limit the design temperature to -28F. However, ammonia will operate with reasonably good efficiency down to -40F. A good purger takes care of the air. Ammonia vapor volume increases drastically as the...

Ammonia vapor driven off in the generator or reboiler of the ammonia absorption refrigeration system contains more water vapor than one would anticipate. It is not yet refrigerant grade. Further rectification is required up the column through reflux injection or other suitable cooling means...

This is meant for "virk" who asked about a low temperature DX ammonia application on October 7th. A new DX control system accurately predicts evaporator liquid feed requirements based on refrigerant vapor quality measured within the evaporator. The technology is called Predictive Direct...