Heat and mass transfer in buildings by Keith J. Moss

By Keith J. Moss

This identify offers pros and scholars with a pragmatic method of center wisdom of warmth move and fluid move because it applies to area heating, water prone and mechanical/natural air flow in and linked to buildings.

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Extra info for Heat and mass transfer in buildings

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The CIBSE Guide lists typical values of thermal conductivity for different materials employed in the building process. 1. Thermal conductivity is one of the properties of a substance. In liquids and gases it is affected by changes in temperature more than in solids. The thermal conductivity of porous solids is affected by the presence of moisture. 1 the outer leaf of a brick wall has a higher thermal conductivity than the inner leaf. Heat conduction can be considered as taking place radially outwards as in the case of an insulated pipe transporting a hot fluid; in two directions as in the case of a floor in contact with the ground and air; and in one direction as in the case of heat flow at right angles through the external building envelope.

6 K. 18 mbar. Mean radiant temperature can be approximately evaluated from the mean weighted enclosure temperature, mwet. mwet = (Aw · tw + Af · tf + Ar · tr + Ag · tg )/(Aw + Af + Ar + Ag ) thus mwet = (A · ts )/ A The suffixes refer to the surface temperature of the enclosing walls, floor, roof and glazing. You can see that it is the mean area weighted temperature of all the surfaces forming the enclosure. It is approximate because it is only most nearly a true mean radiant temperature if the point of measurement is in the centre of the space.

Furthermore, there is frequently more than one slab of material in the building structure being considered. A more appropriate generic formula is given below in which indoor temperature tr , tai , tei and tc are for convenience considered to be equal in value and denoted here as ti . Outdoor temperature tao and teo are considered equal and are denoted here as to . 1) from which the thermal transmittance coefficient or U value for the composite structure which includes surface film resistances is calculated.

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