1. These are three separate questions which are independent of each other. A) Sa

Question

1. These are three separate questions which are independent of each other. A) Saturated liquid Refrigerant 22 is at 100°F. What are the saturation pressure an B) A 3 kg block of copper, which can be treated as an incompressible substance with C) In words, give the names of the two independent laws of thermodynamics that can the enthalpy at this state? constant heat capacity c-0.385 kJ/kg-K, is cooled from 600 K to 450 K. What is the total entropy change of the copper block? be used to assess the feasibility or performance claims of processes.

Explanation / Answer

part A : from the properties chart of refrigerant 22,at 1000F the saturation pressure is 210.69 psia

The specific enthalpy is 39.538 Btu/lb.

part B:

Given data: mass m=3kg,c=0.385 kj/kg k ,Ti=600k,Tf=450k

A block of copper is a solid body. For the solid body the change in entropy is

= m. C. ln(Tf/Ti)=3x0.385xln(600/450)=0.3323 KJ=332.3 joule

part c: to assess the performance of processes, the two independent thermodynamics laws used are first law of thermodynamics and second law of thermodynamics.

First law of thermodynamics : it is also called joules law or law of conservation of energy or quantitative law. It states that energy can be neither created nor destroyed rather it converted from one form to other form. So it defines heat and work mainly and quantitative losses associated with them.

second law of thethermodynamics :it is a directional law or qualitative law or law of degration of energy. If defines concept of energy on quality basis and its feasibility direction through the concept of entropy.

So by analysing the process quantitatively and qualitatively ,we can assess the feasibility .

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