Condition

• 1) Evaporating temperature : -15℃

• 2) Condensing temperature : 30℃

• 3) Temperature at inlet of compressor: -15℃(Dry gas)

• 4) Temperature at inlet of expansion valve: -25℃(sub-cooling temp. 5℃)

 Formula

• 1) Refrigeration ability (Qe) = ha ― he

• 2) Compressor work (W) = hb ― ha

• 3) Condensing load (Qc) = hb ― he = Qe + W

• 4) Coefficient of performance (COP) = Qe/W

• 5) Compression Ratio (Pr) = P2/P1

 Comparing each Coefficient of performance as each refrigerant