2013-3-6 Actual Vapor-Compression Cycle m (a)The compressor power is m。=imh2-h) 底-0o8g28015-24135kW /s=3.1 kw (b)The refrigeration capacity is Cin=rin(h-hs) n-0084324135-9149Ln1om60s kg 211kJ/minmin 3.41 tons Actual Vapor-Compression Cycle a品岛 (c)The coefficient of performance is B (h-h4) (h2-h) 月=24135-91490e=3.36 (280.15-241.35)kJkg 82013-3-6 8 Actual Vapor-Compression Cycle (a) The compressor power is ( ) c 2 1 W = m& h − h & ⎟ − = ⎠ ⎞ ⎜ ⎝ ⎛ = 1kJ/s 1kW kg kJ (280.15 241.35) s kg Wc 0.08 & 3.1 kW (b) The refrigeration capacity is ( ) in 1 4 Q = m& h − h & ⎟ − = ⎠ ⎞ ⎜ ⎝ ⎛ = min 60s 211kJ/min 1 ton kg kJ (241.35 91.49) s kg 0.08 Qin & 3.41 tons State h (kJ/kg) 1 241.35 2s 272.39 2 280.15 3 91.49 4 91.49 Actual Vapor-Compression Cycle (c) The coefficient of performance is ( ) ( ) 2 1 1 4 h h h h − − β = = − − = (280.15 241.35)kJ/kg (241.35 91.49)kJ/kg β 3.86 State h (kJ/kg) 1 241.35 2s 272.39 2 280.15 3 91.49 4 91.49