Kelvin-Planck statement - Basic Mechanical Engineering

Q.  According to Kelvin-Planck statement, it is impossible to construct a device operating on a cycle which transfers heat from ____
- Published on 02 Sep 15

a. low pressure heat reservoir to high pressure reservoir
b. low temperature heat reservoir to high temperature reservoir
c. high pressure heat reservoir to low pressure reservoir
d. high temperature heat reservoir to low temperature reservoir

ANSWER: low temperature heat reservoir to high temperature reservoir

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    Discussion

  • Chirag Patel   -Posted on 29 Jan 21
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  • Sravanthi    -Posted on 12 Nov 15
    - According to Clausius statement, it is impossible to construct a device operating on a cycle which transfers heat from
    low temperature heat reservoir to high temperature reservoir.

    - According to Kelvin-Planck statement, it is impossible to construct heat engine which operates on a cycle and its sole effect is to transfer heat from single heat reservoir and convert it into equal amount of work.

    - Efficiency of the engine is always less than unity.

    - η = Q2 / Q1

    here, Q2 = rejected heat to low temperature heat reservoir
    Q1 = heat received from high temperature heat reservoir

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