Heat released from water to bring it at 0∘C, Q1‌=mcW∆T=15×4200×30 ‌=1.89×106J Heat released to convert water at 0∘C to ice at 0∘C, Q2‌=mLf=15×3.34×105 ‌=5.01×106J Total heat released Q‌=Q1+Q2 ‌=1.89×106+5.01×106 ‌=6.9×106J ∴ Power of refrigerator, P=‌
