MECH 237 Chapter Notes - Chapter 6: Kelvin, Cylinder Head, Carnot Heat Engine
28 Apr 2017
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W net, out = wout win (kj) For a closed system undergoing a cycle, the change in internal energy u is zero: the net work output of the system is also equal to the net heat transfer to the system. W net, out = qin qout (kj) In the above equation qout represents the magnitude of the energy wasted in order to complete the cycle. Qout is never zero, thus the net work output of a heat engine is always less than the amount of heat input. Th = which can also be expressed as: 6. 4: refrigerators and heat pumps: heat transfers in the direction of decreasing temperature, i. e. , from high-temperature mediums to low temperature ones. And this heat transfer does not require any devices. The reverse however, cannot occur on its own: refrigerators: like heat engines, are cyclic devices. The objective of a refrigerator is to remove heat (ql) from the refrigerated space.
