1. A control mass gives out 1000 Btu of energy in the form of

a. Electrical work from a battery

b. Mechanical work from a spring

c. Heat transfer at 700 F Find the change in exergy of the control mass for each of the three cases.

2. A fraction of some power to a motor

(1), 2 kW, is turned into heat transfer at 800 R

(2) and then it dissipates in the ambient at 540 R

(3). Give the rates of exergy along the process 1-2-3.