Complete the table below for R-134a. Draw the appropriate P-v and/or T-v diagram

Question

Complete the table below for R-134a. Draw the appropriate P-v and/or T-v diagrams. Show the state on the diagram using a solid dot. Show all details. Phase v (mVkg kJ/kg) (Quality If A pplicable) ,006732 25.49 20 132.8 Saturated liquid (x=0.0) Saturated vapor 400 05120 255 35 887:73 0015 208 . ly 20119 33911163 20 190 700 0.0347 28. 00 7723 superheteol vafer xzt·182150123 - MEEN 241 FUNDAMENTALS OF THERMODYNAMICS/P. AKANGAH PROBLEM2: A heat engine that powers a power plant burns 1000 kg of co power. Calculate the thermal efficiency if each hg of engine showing the direction of energy flows. Find also the rate of heat rejected al each hour and produces 500 kW of coal produces 6 MJ of energy. Sketch the heat

Explanation / Answer

Problem 2)

Given,

Mass of coal burning each hour = 1000 kg/ hr

So, coal burnt in 1 sec = 1000/3600 = 0.2777 kg

power = 0.27777 x 6 = 1.6667 MJ

electric energy = 500 KW = 0.5 MJ

work output = energy given - energy rejected

rate of heat rejection = 1.66667 - 0.5 = 1.1666 MJ

efficiency = work/heat supplied

efficiency = 0.5/1.66667 = 0.3

2) work output = energy given - energy rejected

= 700 - 250 = 450 KJ

efficiency = work/heat supplied = 450/700 = 0.642

According to Chegg guidelines I can answer one question at a time, so please post other questions separately. Please rate my answer if you find it helpful, good luck...

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