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.

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