Question

During the compression stroke of reciprocating compressor the workdone to the air in this cylinder is 95 kj\kg and 43kj\kg of heat is rejected to the surroundings . Determine the change in internal energy

Answer 1

The change in internal energy will be 138 KJ/Kg.

Step-by-step explanation:

$\textrm {As per 1st law of thermodynamics internal energy can be given as }\\\Delta U = Q - W$

Also we know that when any system do work on its surrounding, it is considered as positive. While when work is done on system its taken as negative.

So from above equation

$\Delta U= 43 - (-95)$

$= 138 KJ/Kg$