When air enters the insulated duct depicted in the following figure, it is at 65 °F and 1.2 atm of pressure; when it leaves, it is at 147 °F and just under 1.2 atm of pressure. The resistor receives 0.2 kW of electricity at a time. One can disregard the impacts of kinetic and potential energy. When operating in the steady state condition, a. Calculate the kW-based exergetic destruction rate. b. Design and assess an energy efficiency rating for the heater.
When air enters the insulated duct depicted in the following figure, it is at 65 °F and 1.2 atm of pressure; when it leaves, it is at 147 °F and just under 1.2 atm of pressure. The resistor receives 0.2 kW of electricity at a time. One can disregard the impacts of kinetic and potential energy. When operating in the steady state condition, a. Calculate the kW-based exergetic destruction rate. b. Design and assess an energy efficiency rating for the heater.
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Transcribed Image Text:1. When air enters the insulated duct depicted in the following figure, it is at 65 °F and 1.2 atm of pressure;
when it leaves, it is at 147 °F and just under 1.2 atm of pressure. The resistor receives 0.2 kW of
electricity at a time. One can disregard the impacts of kinetic and potential energy. When operating in
the steady state condition,
a. Calculate the kW-based exergetic destruction rate.
b. Design and assess an energy efficiency rating for the heater.
Air
1.2 atm
65 °F
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Wev = -0.2 kW
Insulation
147 °F
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