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07-02-2015, 08:56 PM #1
Refrigerant velocity limitation in evaporator ?
Hello, I have found that,in suction line refrigerant velocity must be higher than 8-10 m/s for proper oil return.
I wonder about is there any highest velocity limitation value for the evaporator inlet ? for refrigerant R744
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26-02-2015, 06:14 PM #2
Re: Refrigerant velocity limitation in evaporator ?
Oil return in a (dry?) riser very dependent on viscosity and temperature....and in the case of 744, the means and flows associated with defrosting, where applicable.
As to inlet side: effective distribution says there is a lowest velocity for a flashing refrigerant feeding multiple cap tubes; with velocity increasing, material erosion is the next effect of consequence; and neglecting very low temperature and pressure effects, the next portion of the envelope is established at high velocities associated with near-sonic 2-phase flows. Doubt you will be working near that last limitation.
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09-03-2015, 06:27 AM #3
Re: Refrigerant velocity limitation in evaporator ?
Thank you sterl