VENTILATION AND AIR CONDITIONING BOOK REVIEW
Pre 1975 1991 – 2002
1975 – 1990
21%
59%
20%
50,000 100,000 150,000 200,000 250,000 300,000
0 AHU 3.2 m/s
Distribution of non-residential buildings (excluding industrial) based on the year of completion (Source: Tabula)
AHU 2.6 m/s AHU 2.3 m/s
Capital costs Power costs
Cost of space reorganisation
conjunction with discussion on appropriate speed control of properly selected fans and pumps. (See fi gure 1) The inclusion of a dedicated chapter on
motors and speed control is to be applauded in what otherwise may be thought of a ‘mechanical services’ publication – the brevity of the material is still capable of providing some important ‘keynote’ facts that may otherwise be marginalised. These core technical chapters provide
AHU 1.9 m/s AHU 1.5 m/s
LCC analysis of fi ve different sizes of AHUs with different face velocities. Operating time: 24 hours per day, seven days per week (Source: AL-KO)
IN REVIEW Technical Chapters Indoor environmental quality Air handling units Energy effi cient fans Air fi lters Air-to-air heat recovery systems
Demand controlled ventilation (DCV) Design and balancing of ductwork Chillers and heat pumps Pumps and hydronics
Electric motors and variable speed drives Solar shading equipment
i0522-45 JS Air Curtains CIBSE AD AW_CIBSE Magazine 190x66 17/08/2012 14:50 Page 1
impact on the economic performance of the building. The layout of the subsequent chapters start with ‘Recommendations in a nutshell’, relating to the subject of each of the specifi c sections. The form of these naturally imply ‘rules of thumb’ that are bound to be keenly sought by students and developing practitioners alike and can, when properly informed, give a useful steer to the uninformed or forgetful. The strength of these particular recommendations is that the reader can, and should, within a few hundred words, read the rationale and justifi cation behind them. The descriptions of the application of equipment associated with air handling units (AHUs), and particularly fi lters, fans, heat recovery units and pumps, is orientated towards minimising life cycle costs (LCC). There are some interesting examples comparing the effect that face velocity (the velocity that the air passes through an AHU) has on the LCC of AHUs, indicating the benefi ts of larger section AHUs and in
a good grounding in the sensitivities of selection in centralised air conditioning and ventilation. The most extensive chapter covers on demand controlled ventilation (DCV), which contains some useful background on the benefi ts of using such systems, together with the practicalities of their impact on airfl ows into rooms and control. Oddly, the book ends with a chapter
on passive solar shading – no doubt an important infl uence on building performance – but the space may well have been used to cover areas conspicuous by their absence, including general room air distribution and decentralised systems, such as fan coils, chilled beams and hybrid embedded systems. Some of these are covered in other dedicated books in the series but, then again, so is solar shading. This guidebook provides a quick, well presented read of specifi c aspects of energy effi cient centralised ventilation and air conditioning system technologies applied in commercial buildings. To cover such a potentially broad area, while including detailed discussions in such a condensed format, is challenging.
• Design of energy effi cient ventilation and air-conditioning systems is available at
www.rehva.eu for €50.
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The Art of Air Curtains 52 CIBSE Journal September 2012 JS Air Curtains
www.cibsejournal.com
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