The average thermal conductivity of the walls, roof and windows of a house is 0.480 W/mºC and the average thickness is 21 cm. The total surface area of the house is 492 m2. The house is kept warm by burning natural gas having a heat of combustion of 54 x 106 J/kg. How many kilograms of natural gas needs to be burned in one day if a temperature of 22 ºC is to be maintained inside a house if the outside temperature is 1 ºC?

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Calorimetry

Measuring the heat transferred during chemical reactions or other physical processes is known as calorimetry. It comes under the branch of thermochemistry.