A heat pump can operate at steady state between a dwelling at 70°F and the outdoor air at 32°F, a pond at 40°F, and the ground at 55°F. The heat transfer through the walls and roof of a dwelling is 6.5 x 10 5 Btu/day. [1 hp = 2545 Btu/hr] %3D Assume [3]: ŋMax [TH,Tc] = BMax [TH,Tc] =. YMax [TH,Tc] =

Elements Of Electromagnetics
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A heat pump can operate at steady state between a dwelling at 70°F and the
outdoor air at 32°F, a pond at 40°F, and the ground at 55°F. The heat transfer
through the walls and roof of a dwelling is 6.5 x 10 5 Btu/day. [1 hp = 2545 Btu/hr]
Assume [3]: ŋMax [TH,Tc] =
ВМах [Тн, Тc]
YMax [TH,Tc] =
%3D
1. The maximum coefficient of performance yCarnot for the cycle is approximately
а. 13.95
b. 17.67
с. 35.33
d. none of the above.
2. The heat transfer from the dwelling to the outside air is equal to
а. Qс
b. Он
с. QNet
d. none of the above.
3. The minimum theoretical power_[hp] required to drive a heat pump for heat transfer to
the dwelling from the outside air is equal to
а. 0.76
b. 0.60
с. 0.30
d. none of the above.
4. The minimum theoretical power_[hp] required to drive a heat pump for heat transfer to
the dwelling from the pond is equal to
а. 0.30
b. 0.76
с. 0.60
d. none of the above.
5. The minimum theoretical power_[hp] required to drive a heat pump for heat transfer to
the dwelling from the ground is equal to
а. 0.60
b. 0.30
с. 0.76
d. none of the above.
Transcribed Image Text:A heat pump can operate at steady state between a dwelling at 70°F and the outdoor air at 32°F, a pond at 40°F, and the ground at 55°F. The heat transfer through the walls and roof of a dwelling is 6.5 x 10 5 Btu/day. [1 hp = 2545 Btu/hr] Assume [3]: ŋMax [TH,Tc] = ВМах [Тн, Тc] YMax [TH,Tc] = %3D 1. The maximum coefficient of performance yCarnot for the cycle is approximately а. 13.95 b. 17.67 с. 35.33 d. none of the above. 2. The heat transfer from the dwelling to the outside air is equal to а. Qс b. Он с. QNet d. none of the above. 3. The minimum theoretical power_[hp] required to drive a heat pump for heat transfer to the dwelling from the outside air is equal to а. 0.76 b. 0.60 с. 0.30 d. none of the above. 4. The minimum theoretical power_[hp] required to drive a heat pump for heat transfer to the dwelling from the pond is equal to а. 0.30 b. 0.76 с. 0.60 d. none of the above. 5. The minimum theoretical power_[hp] required to drive a heat pump for heat transfer to the dwelling from the ground is equal to а. 0.60 b. 0.30 с. 0.76 d. none of the above.
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