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Thread: Causes of Negative Subcooling
03-31-2010, 12:32 PM #21
For more context:
I'm a student in a refrigeration/ac/water technology program. Last week, we were working on a unit for a walk-in freezer (uses 402a). The pressure at the discharge line was 205 psig, which corresponds to approx 85 deg F, if I'm not mistaken. Then we took our temp at the liq line just before the metering device (txv maybe?): we read 86 deg F, or -1 deg subcooling. I noticed the condenser fan was rejecting ambient-ish temp air, which I thought was odd.
Curiously, our evaporator pressure was 16 psig (-23 deg F), which seems very low, and our suction line temp was 57 deg. So that put our s/h at 57 - (-23), or 80 deg. I just shook my head at that point...