Faber & Kell's Heating & Air-Conditioning of Buildings by Doug Oughton, Steve Hodkinson BTech CEng MCIBSE MInstE

By Doug Oughton, Steve Hodkinson BTech CEng MCIBSE MInstE

''Faber and Kell'' has for over fifty years been authorized because the so much functional and accomplished publication on heating and air-con layout and is thought of as the traditional reference ebook for either scholars and practitioners. with a view to offer up to date info, this 9th variation has been revised to incorporate the most recent adjustments to approach layout and covers many points in better intensity, when nonetheless preserving the nature of earlier variants.

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By Doug Oughton, Steve Hodkinson BTech CEng MCIBSE MInstE

''Faber and Kell'' has for over fifty years been authorized because the so much functional and accomplished publication on heating and air-con layout and is thought of as the traditional reference ebook for either scholars and practitioners. with a view to offer up to date info, this 9th variation has been revised to incorporate the most recent adjustments to approach layout and covers many points in better intensity, when nonetheless preserving the nature of earlier variants.

Show description

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Extra resources for Faber & Kell's Heating & Air-Conditioning of Buildings

Example text

This can cause wetting of the insulation and a consequent degradation of performance. Over the long term, it can also result in structural damage. It can create problems of draughts in cold weather. It can upset the balance of mechanical ventilation systems, especially in windy or cold weather. Measurements of air leakage have shown that UK buildings are generally much leakier than their Scandinavian or North American counterparts. In order to stimulate improvement of this critical aspect of energy performance, a maximum air permeability limit of 10 m3 /hr Á m2 at an applied pressure difference of 50 Pa has been set.

An exception may arise in the case of the resistance offered by an air gap in a cavity construction (Ra ) where two sets of values are given, one for the situation where the facing surfaces within the air gap have high emissivity and the other to meet the case where a bright metallic surface, such as aluminium foil, is inserted to provide low emissivity. 1, and others are listed in the Guide Section A3. 035 W/m K and the thermal conductance (C) of a slab of this material, 25 mm thick, is thus 0:035/0:025 ˆ 1:4 W/m2 K.

One thermometer is fitted with a wick which is fed with water from a small reservoir in the frame and both the water, preferably distilled, and the wick must be clean. Readings are taken after the instrument has been whirled vigorously to simulate an air speed above about 3 m/s. An alternative instrument, the Assmann type, consists of a miniature air duct within which the two thermometers are mounted, air being drawn over them by a small fan, clockwork or electrically driven, at a known velocity.

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