A 15kg iron ball whose specific heat is 045 kJkgC is at a un

A 15-kg iron ball whose specific heat is 0.45 kJ/kg.°C is at a uniform temperature of -10°C. For an environment temperature of 25°C, the exergy content of this ball is 1. Less than zero 2. 0 kJ 3. 1.0 kJ 4. 15 kJ 5. 236 kJ

MASS OF IRON BALL,M = 15KG

SPECIFIC HEAT OF BALL,Cp = .45KJ/KG.°C

TEMPERATURE OF BALL,Tb = -10°C

SURROUNDING TEMPERATURE,To = 25°C

EXERGY CONTENT OF BALL,X = M.Cp[(Tb-To)-[To.ln(To/Tb) ]] = 15*.45*(25 -(-10)) KJ -15*.45*298*ln(298/263) KJ =( 236 - 251) KJ =15 KJ

SO X = 15 KJ

SO OPTION (4) IS CORRECT

A 15-kg iron ball whose specific heat is 0.45 kJ/kg.°C is at a uniform temperature of -10°C. For an environment temperature of 25°C, the exergy content of this

A 15kg iron ball whose specific heat is 045 kJkgC is at a un

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