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30 January, 12:30

Air undergoes a constant pressure process from 300K to 500K in a piston cylinder. Determine the heat transfer for this process in [kJ/kg). You may assume that air behaves as an ideal gas with constant specific heats.

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  1. 30 January, 14:32
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    200.1kJ/Kg

    Explanation:

    To solve this problem we must apply the first law of thermodynamics, which indicates that the energy that enters a system is the same that must come out, resulting in the following equation

    q=cp (T2-T1)

    where

    q = heat per unit mass

    cp=specific heat for air=1.005KJ / (kgK)

    Specific heat is a property of air that indicates how much the air temperature rises per unit of thermal energy

    T2=temperature in state 2=500k

    T1=temperature in state 1=300k

    q=1.005 (500-300K) = 200.1kJ/Kg
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