Difference between revisions of "Heating consumption of buildings"
(New page: ==Scope== To define heating consumption of buildings. ==Definition== Heating consumption (Q) of buildings can be defined with knowledge of surface area of building, inside and outside t...) |
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| − | A<sub>f</sub> = A<sub>r</sub> | + | A<sub>f</sub> = A<sub>r</sub> |
| − | A<sub>w</sub> = 8A<sub>f</sub> | + | A<sub>w</sub> = 8A<sub>f</sub> |
| − | U<sub>f</sub> = (A<sub>f</sub>/A<sub>f</sub>*U<sub>f</sub> + A<sub>w</sub>/A<sub>f</sub>*U<sub>w</sub> + A<sub>r</sub>/A<sub>f</sub>*U<sub>r</sub>)/(A<sub>tot</sub>/A<sub>f</sub>) | + | Floor weighted heating permeability factor is calculated as: |
| + | U<sub>f</sub> = (A<sub>f</sub>/A<sub>f</sub>*U<sub>f</sub> + A<sub>w</sub>/A<sub>f</sub>*U<sub>w</sub> + A<sub>r</sub>/A<sub>f</sub>*U<sub>r</sub>)/(A<sub>tot</sub>/A<sub>f</sub>) | ||
| + | =(U<sub>f</sub> + 8U<sub>w</sub> + U<sub>r</sub>)/10 | ||
| − | + | where A<sub>f</sub> is area of floor, A<sub>r</sub> is area of roof, A<sub>w</sub> is area of walls, U<sub>f</sub> is heating permeability factor of floor, U<sub>w</sub> heating permeability of walls, and U<sub>r</sub> is heating permeability factor of roof, A<sub>tot</sub> is total area of building surfaces. Unit of areas are m<sup>3</sup>, unit of heating permeability factors are kW/m<sup>2</sup> K. | |
| − | + | Heating consumptions of building is calculated as: | |
| + | Q = U<sub>f</sub> * A<sub>tot</sub> * (T<sub>in</sub>-T<sub>out</sub>)dt | ||
| − | + | where U<sub>f</sub> is floor weighted heating permeability factor of building, A<sub>tot</sub> is total surface area of building, and T<sub>in</sub> is inside temperature and T<sub>out</sub> outside temperature in time dt.Unit of areas are m<sup>3</sup>, unit of heating permeability factors are kW/m<sup>2</sup> K. | |
| − | + | ==Unit== | |
| + | kW/year | ||
| + | |||
| + | ==Result== | ||
Revision as of 08:52, 7 April 2009
Contents
Scope
To define heating consumption of buildings.
Definition
Heating consumption (Q) of buildings can be defined with knowledge of surface area of building, inside and outside temperature in certain time period, and heat permeability factors. Easiest way to use heating consumption is to define it as floor area weighted calculation.
Assumptions:
Af = Ar Aw = 8Af
Floor weighted heating permeability factor is calculated as:
Uf = (Af/Af*Uf + Aw/Af*Uw + Ar/Af*Ur)/(Atot/Af) =(Uf + 8Uw + Ur)/10
where Af is area of floor, Ar is area of roof, Aw is area of walls, Uf is heating permeability factor of floor, Uw heating permeability of walls, and Ur is heating permeability factor of roof, Atot is total area of building surfaces. Unit of areas are m3, unit of heating permeability factors are kW/m2 K.
Heating consumptions of building is calculated as:
Q = Uf * Atot * (Tin-Tout)dt
where Uf is floor weighted heating permeability factor of building, Atot is total surface area of building, and Tin is inside temperature and Tout outside temperature in time dt.Unit of areas are m3, unit of heating permeability factors are kW/m2 K.
Unit
kW/year
