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It is not intended to be exhaustive or definitive and it will be necessary for users of the guidance given to exercise their own professional judgement when deciding whether to abide by or depart from it. INDEX Index Terms Links A AC (alternating current) motors 16–17 Air handling units 8 14–17 capital costs 3 11 15 pressure drops 8 15–16 19 schematic 1 service life 4 Air leakage 9 19 ASHRAE Handbook: Fundamentals 9 24 Aspect ratios 18 12 Assessment methodology 6–7 Availability 5–6 Axial fans — see Fans B Bends 8–9 24–25 Building Regulations Approved Document L2 2 4 7 Building Regulations, Part L 2 4 8 Building services component life manual 3 Building Standards (Scotland) Regulations 7 19 15–16 19 1 2–3 24–25 air handling units 3 11 15 ductwork 3 15 24–25 Carbon emissions 2 4 5 13 19 7 8 Bypassing coils 19 C Capital costs see also Energy costs Cavity ventilation 13 Ceiling voids 12 Centrifugal fans — see Fans CIBSE Commissioning Code A: Air distribution systems CIBSE Guide A: Environmental design 4 14 CIBSE Guide B2: Ventilation and air conditioning 1 CIBSE Guide B3: Ductwork 9 This page has been reformatted by Knovel to provide easier navigation.

Foreword This publication reports the results of a Partners in Innovation project that explored ways of improving the life cycle performance of mechanical ventilation systems. The work was based on a range of desk analyses, case studies and laboratory measurements. The results suggest that there are significant opportunities to reduce whole life cost through revised design criteria and alternative equipment selections. Performance standards for air conditioning and mechanical ventilation systems have been introduced with the 2002 edition of the Approved Documents of Part L of the Building Regulations.

G. g. a damper) in each section of the duct run. However, because robust cost and pressure loss data for such fittings and components are not available, the effect of such fittings has been ignored. 8 can be replaced with the term (N × ξ), where ξ is the loss coefficient for each bend in the duct section. 10) This equation may be solved numerically to give Dopt. Foreword This publication reports the results of a Partners in Innovation project that explored ways of improving the life cycle performance of mechanical ventilation systems.

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