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Ceiling heat is electric resistance zonal heat. Usually, ceiling heat is installed under the thin-wall plaster or between layers of sheetrock on the ceiling. The majority of ceiling heat consists of a single wire spaced six to ten inches apart in a non-overlapping pattern and controlled by an individual line voltage thermostat.
Heating Values of Natural Gas. The heating value of a substance is the energy released upon combustion of a substance at standard conditions. The heating value can be measured as energy released per unit mass, unit volume or unit mole of a substance. For mixtures, the heating value can be estimated as a weighted sum. The following table gives heating values of various hydrocarbons and some other gases in Btu/Scf (energy released per unit volume). BTU : British Thermal Unit for energy. SCF : Standard Cubic Feet of gas. (Standard conditions correspond to 1.013 bara and 200C{adinserter 2}.