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T1 = 127 st C = 400 K
T2 - ciepło chłodnicy
T2 = 27 st C = 300 K
Korzystamy ze wzory
η = (T1 - T2) / T1 * 100%
η= (400 - 300) / 400 * 100 % = 25%
Tchłodnicy=27C=300
sprawność= T-Tchłodnicy/T
sprawność= 100/400=0,25= 25%