A closed system of mass 2 lb undergoes two processes in series:

Process 1–2: v1  v2 4.434 ft3 /lb, p1  100 lbf/in.2 , u1 1105.8 Btu/lb, Q12  581.36 Btu

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Process 2–3: p2  p3  60 lbf/in.2 , v3 7.82 ft3 /lb, u3 1121.4 Btu/lb

Kinetic and potential energy effects can be neglected. Determine the work and heat transfer for process 2–3, each in Btu.

An electric generator coupled to a windmill produces an average electric power output of 15 kW. The power is used to charge a storage battery. Heat transfer from the battery to the surroundings occurs at a constant rate of 1.8 kW. Determine, for 8 h of operation

(a) the total amount of energy stored in the battery, in kJ.

(b) the value of the stored energy, in $, if electricity is valued at $0.08 per kW # h.


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