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NC-2009 EAc4:Enhanced Refrigerant Management

Refrigerant Calculator and Thermal Storage

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James Keohane
Sustainability and Commissioning Consultant
Sustainable Engineering Concepts, LLC
LEEDuser Basic Member
86 thumbs up

Which tonnage should be used when using refrigerant calculator while considering a chiller plant serving a static ice thermal storage system? When chillers are in Ice Making Mode producing 24F fluid; chiller capacity is substantially reduced as compared to Chiller Mode when chiller is producing 42F fluid. For example a 100 ton chiller at 42F discharge temp may produce 65 tons when producing 24F fluid. I am thinking a pro-rated calculation may be appropriate based on run hours per day or week. Your thoughts and comments please and thank you.

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David Hubka
Director of Operations
Transwestern Sustainability Services
LEEDuser Basic Member
355 thumbs up

Sat, 08/04/2012 - 16:46

Great question!! My guess is that the LEED reviewer will require the calculation be performed with the worst case condition (this ensures the mechanical system meet the credit requirement through all modes of operation) - similar to ventilation calculations. good luck!

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