Question

Which value is determined by subtracting the heat of vaporization of the water from the higher heating value?

(a) Gross calorific value

(b) Net calorific value

(c) Ignition temperature

(d) Fire point temperature

I got this question in a national level competition.

My query is from Calorific Value of Fuels topic in division Steam Power Plant of Energy Engineering

Answer 1

The correct choice is (b) Net calorific value

Explanation: Net calorific value determined. In most of the combustion processes, the products of combustion cannot be cooled to its initial temperature. Thus water vapors don’t condense and hence the latent heat of water vapor is lost to the atmosphere. The resultant heat liberated by the fuel which excludes the latent heat of evaporation of water vapors is known as lower calorific value of fuel.