Liquid Refrigerant Pumping
Has anyone actually used magnetically-coupled liquid pumps on the liquid line (after the receiver king valve) to increase the liquid line pressure ? This is supposed to ensure 100% liquid at the TXV inlet. There is also a liquid injection line (after this pump) to the compressor discharge line to desuperheat the discharge gas.
The intention is to increase refrigeration capacity ( for an inefficient system) and reduce compressor runtime ( energy saving)
Anyone with any experience in this?
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Liquid Refrigerant Pumping
Thanks for all the replys.
How do you change from a fixed head to a floating head system? This is supposed to be a benefit of the Liquid Refrigerant Pumping (LRP). This may be a basic question to most practical guys ( I do understand the theoretical benefits from the P-E diagram)
Furthermore , has anyone any practical experience with desuperheating the dischrge gas using a tap-off from an LRP - does this actually give you additional condensor capacity ( as per the P-E chart ) How does the P-E chart's compression line look like ? Ideally its isentropic and practically its something else, I think. But with desuperheating, does it still maintain the same compression line but a temperature drop horizontally at constant pressure ?
Again, I agree with those who proposed liquid subcooling - it's cheaper. I have designed and installed a system Bitzer 2-stage compound semi hermetic with a SWEP phe liquid subcooler and get about 5 deg C sub cooled liquid on a -31 deg C SST and 45 deg C SCT system.
Thanks guys
Re: Liquid Refrigerant Pumping
Quote:
Originally posted by bersaga
Thanks for all the replys.
How do you change from a fixed head to a floating head system? This is supposed to be a benefit of the Liquid Refrigerant Pumping (LRP). This may be a basic question to most practical guys ( I do understand the theoretical benefits from the P-E diagram)
Furthermore , has anyone any practical experience with desuperheating the dischrge gas using a tap-off from an LRP - does this actually give you additional condensor capacity ( as per the P-E chart ) How does the P-E chart's compression line look like ? Ideally its isentropic and practically its something else, I think. But with desuperheating, does it still maintain the same compression line but a temperature drop horizontally at constant pressure ?
Again, I agree with those who proposed liquid subcooling - it's cheaper. I have designed and installed a system Bitzer 2-stage compound semi hermetic with a SWEP phe liquid subcooler and get about 5 deg C sub cooled liquid on a -31 deg C SST and 45 deg C SCT system.
Thanks guys
Check out the Ph chart and observe THR. The % shown between(desuperheat) (latent) enthalpy ratio could provide the answer-provided, liquid introduction at. sat conditions and increased mass flow, prove lower head operation.
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