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Thread: Setting of Hand expansion valve
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07-09-2008, 06:36 PM #1
Setting of Hand expansion valve
Blast freezer with 20 evaporator coils liquid overfeed and hand expansion valve to each coil.
I'm looking for best way to set the hand expansion valve?
I know coil/freezer mfr says a 3:1 or 4:1 overfeed. First evaporator coil sees much warmer product so more vaporization there than later coils after the latent zones so these valves are open more that at exit of freezer. Any good tried n true methods out there for setting the hand expansion valve? I read Industrial Refrigeration Handbook by Stoecker and the chart on Circulation ratio but it doesn't explain how to get the overfeed setting for each coil. With the multiple coils how do I know what ratio each coil is getting, 1:1, 2:1, 3:1. If hand expansion was fully opened they could be grossly overfed especially the last coils.
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