Heating value

S.Gunabalan Associate Professor Mechanical Engineering Department Bharathiyar College of Engineering & Technology Karaikal - 609 609. e-Mail : gunabalans@yahoo.com

Heating value

The heating value (or energy value or calorific value) of a substance, is the amount of heat released during the combustion of a specified amount of fuel. It is measured in units of energy per unit of the substance, kJ/kg, Heating value is commonly determined by use of a bomb calorimeter.

heat of combustion

The heat of combustion is the energy released as heat when a compound undergoes complete combustion with oxygen under standard conditions.

Heating values

• The higher heating value (HHV), (also known as the gross calorific value or gross energy) of a fuel is defined as the amount of heat released by a specified quantity (initially at 25 °C) of fuel, it is combusted and the products have returned to a temperature of 25 °C.

• The higher heating value takes into account the latent heat of vaporization of water in the combustion products,

• Or Lower calorific value (LCV)) is determined by subtracting the heat of vaporization of the water vapor from the higher heating value.

Reference • Moran, M. J. 2011. Fundamentals of engineering thermodynamics. Wiley,

[Hoboken, N.J.?]. • Rajput, R. K. 2010. Engineering thermodynamics. Jones and Bartlett

Publishers, Sudbury, Mass. • Nag, P. K. 2002. Basic and applied thermodynamics. Tata McGraw-Hill, New

Delhi.