heat value
91R-value — [är′val΄yo͞o] n. a measurement indicating the resistance of a given thickness of material, esp. insulating material, to the flow of heat: the higher the R value, the greater the insulation …
92R-value — noun Etymology: probably from thermal resistance Date: 1948 a measure of resistance to the flow of heat through a given thickness of a material (as insulation) with higher numbers indicating better insulating properties compare U value …
93U-value — noun Etymology: unit Date: 1949 a measure of the heat transmission through a building part (as a wall or window) or a given thickness of a material (as insulation) with lower numbers indicating better insulating properties compare R value …
94Lower (Net) Heating Value — The lower or net heat of combustion for a fuel that assumes that all products of combustion are in a gaseous state. (See Net Heating Value below.) …
95Net (Lower) Heating Value — (NHV) The potential energy available in a fuel as received, taking into account the energy loss in evaporating and superheating the water in the fuel. Equal to the higher heating value minus 1050W where W is the weight of the water formed from… …
96calorific value — n the heat of combustion of a unit quantity of a substance. DISCUSSION It is expressed inASTM test methods in British thermal units per pound (Btu/lb). Calorific value can also be expressed in calories per gram (cal/g) or in the International… …
97U-value — UK [ˈjuːˌvæljuː] / US [ˈjuˌvælju] or U factor UK / US noun [countable] a measure of how well a part of a building, for example a window or a roof, prevents heat from escaping …
98calorific value — /ˌkælərɪfɪk ˈvælju/ (say .kaluhrifik valyooh) noun 1. the amount of heat produced by the complete combustion of a given quantity of a substance, especially a fuel. 2. Also, calorific content. the number of calories (def. 2) in a type of food:… …
99heating value — Amount of heat which may be obtained by burning a fuel. The heating value is usually expressed in Btu per lb., Btu per gal., or kJ/kg …
100r-value — ˈ ̷ ̷ ¦ ̷ ̷ (ˌ) ̷ ̷ noun Usage: usually capitalized R Etymology: probably from thermal resistance : a measure of resistance to the flow of heat through a given thickness of a material (as insulation) with higher numbers indicating better… …
