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20-06-2010, 10:32 PM #12
Re: ecube refrigeration efficiency device
How does VSD at full load reduce stress on bearings? Screw comopressor VSD use 3-3.5% of additional energy. At 100% load compressor with VSD is less efficient than compressor without VSD.
Different energy suppliers charge for energy differently. When we shift the load for cold storage, we increase demand charges and refrigeration load will increase as well. However, we will save on cheap energy. As far as I remember, one research was done in Industrial Refrigeration Consortium. They determine that on peak energy should be at least 2.2 times more expensive to justify full load shifting.
COP 18 tell me nothing, because COP depends of the cycle. Can you get COP 18 for cold storage?
Compressor definitely the major energy consumer, but we pay for energy use of whole plant not only compressor. So condensing pressure, suction pressure, defrost should be optimized to minimize energy use of whole refrigeration plant.