Question

QUESTION 1 A rooftop unit exhausts return air from the space to outdoors exhaust? Assume the COP for the unit is 3.0 and that electricity costs are $0.10/kWh. Properties of air: density o and replaces it with 7,364 CFM of fresh air. THe exhausted air is at 77F and the fresh 89F. If ths unit is cooling for 2,579 hours each year, what annual savings, in dollars, is possible by cooling the fresh 0743 ib/t3, cp 0.24 Btu/1bm-F

Answer 1

min (89-п) f 27709 . 009 Watt - 27. 709 KhW 89 F cop 셔 2 Cof-, - Q hWi 77F

W= 21.709 KW 3 89 +77 2T 83 F nV W' s47 .ly s 2 xo.24X(83-77) m crAT a' 3 wi = = - 3 3

ђ W、 = 262.630 Btu/min 4.618 KW -. 613 KW x 25 79 hu 4-322 KW h 0.10 x 11404. 8 22Kuhi, RW 丰1 140.972 1140. 932 CNa bad dael .'. Ahrua