1.In the cylinder of an air motor, the compressed air at the beginning of an expansion cycle has an internal energy of 500 kJ/kg and after expansion an internal energy of 150 kJ/kg. Calculate the heat flow from or to the system, when the work done by the air during expansion is 200 kJ/kg 2. The heat loss in a certain non-flow process is 785 kJ. The internal energy increases by 522 kJ. How much work is being done?
1.In the cylinder of an air motor, the compressed air at the beginning of an expansion cycle
has an internal energy of 500 kJ/kg and after expansion an internal energy of 150 kJ/kg. Calculate
the heat flow from or to the system, when the work done by the air during expansion is 200 kJ/kg
2. The heat loss in a certain non-flow process is 785 kJ. The internal energy increases by 522
kJ. How much work is being done?
3. In the compression stroke of an internal combustion engine the heat rejected to the cooling
water is 45 kJ/kg and the work input is 90 kJ/kg. Calculate the change in specific internal energy
of the working fluid stating whether it is a gain or a loss.
4.
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