A closed system of mass 2 lb undergoes two processes in series:
Process 1Ă˘â‚¬â€ś2: v1Ă‚Â v2 4.434 ft3 /lb, p1Ă‚Â 100 lbf/in.2 , u1 1105.8 Btu/lb, Q12Ă‚Â 581.36 Btu
Process 2Ă˘â‚¬â€ś3: p2Ă‚Â p3Ă‚Â 60 lbf/in.2 , v3 7.82 ft3 /lb, u3 1121.4 Btu/lb
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Kinetic and potential energy effects can be neglected. Determine the work and heat transfer for process 2Ă˘â‚¬â€ś3, 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.