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Practice set on AVABILITY AND IRREVERSIBILITY

Score:  08
1. 

 A steel billet of 2000 kg mass is to be cooled from 1250 K to 450 K. The heat released during this process is to be used as a source of energy. The ambient temperature is 303 K and specific heat of steel is 0.5 kJ/kg K. The available energy of this billet is:

2. 

 Availability of a system at any given state is:


3. 

 Neglecting changes in kinetic energy and potential energy, for unit mass the 

availability in a non-flow process becomes a = ɸ - ɸo, where ɸ is the 

availability function of the



4. 

Gibb’s function is expressed as 



5. 

 Availability function is expressed as 



6. 

Helmholtz function is expressed as 



7. 

A heat reservoir at 900 K is brought into contact with the ambient at 300 K for 

a short time. During this period 9000 kJ of heat is lost by the heat reservoir. 

The total loss in availability due to this process is:



8. 

What will be the loss of available energy associated with the transfer of 1000 

kJ of heat from constant temperature system at 600 K to another at 400 K 

when the environment temperature is 300 K?


Lecture Notes