Question

2. (L18-20, L24-26) Consider the refrigerator analyzed in class with an air-cooled condenser (see code posted with HW 3 on Canvas). You are asked to determine the optimal condenser size .The initial condenser cost is $10/(W K (i.e., cost $10 UAcond). . The cooling air flow rate is 1 kg s-1 per 1000 W K-1 Cita-(1 kg s-1) × The condenser will last for N-12 years, and can be salvaged for 10% of the initial cost. 1000 W K-1 The refrigerator must deliver 40,000 kWh of cooling each year with Teva,--10°C and Tamb 25°C. .Electricity costs $0.10 /kWh, and is the only annual operating cost for the system. The required annual rate of return is ROR-0.1 Given these specifications, what is the optimal size of the condenser (UAcond) that minimizes the net present cost? How would the optimal condenser size change if the price of electricity increased from 0.10 S/kWh to 0.15 S/kWh)? a. b. ceolingairflou 2 sat3 3 min 25℃ comp メ1 Q cool

Answer 1

Gfuen clato evap -10C Con dler se main 2S rom oum -10で 273 263 263 Vapoed& = 40,000 kugh

29召 293000 298 K Ma.pora -Ana 3600. 3 6 1-T. T.2583

즉,倭) 븝 Now t 5% O.12 2.3)3.816

29S-3-28 , 2S 298 kW 0 UA omp 22.8 ici 332. 640 tncveaue to 0.ls kuk ее 3, 0 1 X 3600 X 0.15

Net derence 3.sy 13 32.610 665-64 . et d#ference :