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  2. Tog (unit) - Wikipedia

    en.wikipedia.org/wiki/Tog_(unit)

    The results given in this paper are expressed in terms of watts, °C and metres. So that practical clothing may be described conveniently by a range of small integers, the unit of thermal resistance, to be called the “tog”, is the resistance that will maintain a temperature difference of 0.1°C. with a flux of 1 watt per square metre, or in ...

  3. Floor and ceiling functions - Wikipedia

    en.wikipedia.org/wiki/Floor_and_ceiling_functions

    In mathematics, the floor function is the function that takes as input a real number x, and gives as output the greatest integer less than or equal to x, denoted ⌊x⌋ or floor(x). Similarly, the ceiling function maps x to the least integer greater than or equal to x, denoted ⌈x⌉ or ceil(x). [1]

  4. R-value (insulation) - Wikipedia

    en.wikipedia.org/wiki/R-value_(insulation)

    Installed faced fiberglass batt insulation with its R-value visible (R-21) [1]. The R-value is a measure of how well a two-dimensional barrier, such as a layer of insulation, a window or a complete wall or ceiling, resists the conductive [2] flow of heat, in the context of construction. [3]

  5. Building insulation - Wikipedia

    en.wikipedia.org/wiki/Building_insulation

    Minimum roof insulation level by climate – cool temperate; Alpine reducing heat loss is the main priority Example locations Minimum insulation level (total R-value (m 2 ⋅K/W)) Roof/ceiling* [26] Wall [26] Melbourne, Vic 4.1 2.8 Canberra, ACT 4.1 2.8 Hobart, Tas 4.1 2.8 Mt Gambier, SA 4.1 2.8 Ballarat, Vic 4.1 2.8 Thredbo, NSW 6.3 3.8

  6. Air changes per hour - Wikipedia

    en.wikipedia.org/wiki/Air_changes_per_hour

    If an air volume equal to the inside volume of the building flows across the envelope in one hour, then ACH = 1. [11] Airtightness improves buildings' energy performance since low airtightness levels imply high infiltration rates, draughts, risk of condensation, and moisture accumulation, and other effects. [ 12 ]

  7. List of thermal conductivities - Wikipedia

    en.wikipedia.org/wiki/List_of_thermal_conductivities

    The Lasance approximation formula is K e /K 0 = 1/(1+C/PP). Some readers might find the notation confusing since the original mK might be interpreted as milliKelvins when it is really meter-Kelvins. He (Lasance?) puts a one (1) at the end of his equation so that it appears like this: K e /K 0 = 1/(1+C/PP)(1).

  8. Stefan–Boltzmann law - Wikipedia

    en.wikipedia.org/wiki/Stefan–Boltzmann_law

    The radiant exitance (previously called radiant emittance), , has dimensions of energy flux (energy per unit time per unit area), and the SI units of measure are joules per second per square metre (J⋅s −1 ⋅m −2), or equivalently, watts per square metre (W⋅m −2). [2]

  9. Unit of measurement - Wikipedia

    en.wikipedia.org/wiki/Unit_of_measurement

    The former Weights and Measures office in Seven Sisters, London Units of measurement, Palazzo della Ragione, Padua. A unit of measurement, or unit of measure, is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity. [1]

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