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Thread: CO2 compression systems
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11-11-2010, 11:38 PM #18
Re: CO2 compression systems
One end user, one contractor, one consultant. It looks like they work as a team.
I didn't see this report. However, to do it right they should compare apple and apple. It looks like CO2 recip. compressors were compared to NH3 screw compressors. Definitely, part load efficiency of recip. is better than part load of screw. However, if you put VFD for screw it will be close. Another issue is condensing pressure. NH3 system require hot gas defrost. Some people do defrost at 150 psig, others at 120 psig. I saw plant that was defrosted at 80 psig of condensing pressure. What pressure did they choose for this study? Probably, 180 psig for NH3 plant and 100 psig for CO2. In this case you will get 30% of energy savings. CO2 plant has electrical defrost. No limitation to the condensing pressure. However, they have to change elec. heaters very often.
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