Question

QUESTION 1 a) Company A designed a heat pump to supply heat into a library in Canada during winter, so that the library can maintain to be at 20°C. The heat pump utilizes 12,000 L/min of Refrigerant-134a as the working fluid and absorb heat from an industrial water stream. The water stream enters the evaporator at 50°C and exits at 25°C. The refrigerant enters the evaporator at 10°C with 90% moisture content and leaves at 20°C. There is no pressure drop in the evaporator and according to Company A, the compressor consumed 2250 kW of power. (i) (ii) (iii) (iv) (v) Sketch a complete schematic diagram of the heat pump comprises all components and information for the operation Using Energy Balance in the evaporator, determine the mass flow rate of the water stream Calculate the rate of heating load and rate of heat supply, in kW Find the COP of the heat pump A competitor, Company B claimed that they can come up with a more economical design for the heat pump, consuming only 800 kW in the compressor with the same heating load as Company A's design. Is this claim valid? Support your answer with proper calculation.

Answer 1

X SH 3 turom Envicorrent tant + r 2 Condenser R-1349 Expansion Valve win - 2250kW Compressor Evaporator -1004 1 unt 4 c Cold 30% 256 enviorment wakę water out

DATE T egn 2 200 Win - 2250 kw -loc A din S we get By using energy balance in evaporation mahu+gin= mihi Qin M Chi-hy)-0 (massis sure Din = now so-25) cp Sin=25oco Density of R-1349 at -10°C 3=1310 kg/m3 ů = 12000 1941 min = 0.23s r8=1310X02 70 262 kg/s Sinom Chithy) at stale e Moisture cconstant-90%. Donnes fraction 2=0.1 at -10°c hf = 38.5kg/kg hichaa 244.55 kJ/kg huahff ahog 559.132 € Illeg Qinam Chichy) 25 cp now 2262 X (266.55-59.13) new = 1933.43 kq ls

DATE 113 Incompari Cha-hy) 225o =262 x Ch2-2bb053) h2=253.14 kJ/kg Sout =ń Cha-hal = 262 X (253.14-59.13) Sout s0830.04 kJ/kg Cop= 8our ein 22:59 cicomp Now for omgiven 800kw Wcomp=m Cha-hu 800=262 x Cha-266.55) h2=247 of kilkg Sour ans Chr-hoa = 262x ( 247.6-59.13) Sout 49379.14 kilky (your) The given claim is notvald, 7 lepowt) A
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