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5 December, 00:20

An engineer devises a scheme for extracting some power from waste process steam. The engineer claims that the steam enters the device at 340 F and quality 75%, and exits at 220 F and 65% quality.

Does this device violate the first law of thermodynamics?

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  1. 5 December, 00:40
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    This device does not violate the first law of thermodynamics

    Explanation:

    First law of thermodynamics states that any change in the internal energy (∆E) of a system is given by the sum of the heat (q) that flows across its boundaries and the work (w) done on the system by the surroundings:

    i. e (∆E) = q + w

    The operation of the device is coherent with the first law of thermodynamics because the work extracted from the steam causes a drop in the internal energy and quality of the steam. This is reflected by the drop in temperature which is from 340 F to 220 F.

    This drop in temperature and quality shows that work is extracted from the total energy of the system, proving that the device obeys the first law of thermodynamics.
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