CPD Programme CPD Programme
The CIBSE Journal CPD Programme Members of the Chartered Institution of Building Services Engineers (CIBSE) and other professional bodies are required to maintain their professional competence throughout their careers. Continuing professional development (CPD) means the systematic maintenance, improvement and broadening of your knowledge and skills, and is therefore a long-term commitment to enhancing your competence. CPD is a requirement of both CIBSE and the Register of the Engineering Council (UK). CIBSE Journal is pleased to offer this module in its CPD programme. The
programme is free and can be used by any reader. This CPD will help you to meet CIBSE’s requirement for CPD. It will equally assist members of other institutions, who should record CPD activities in accordance with their institution’s guidance. Simply study the module and complete the
questionnaire on the final page, following the instructions for its submission. Modules will remain available online at
www.cibsejournal. com/cpd while the information they contain remains current. You can also complete the questionnaire
online, and receive your results by return email.
Lighting control technologies and strategies to cut energy consumption
Lighting is reponsible for the largest slice of energy consumption in offices. This CPD module looks at how lighting controls and other strategies can help reduce this electricity use and enhance user comfort. A case study on an office building in New York is also considered
H
aving just come to the end of the first registration period of the Carbon Reduction Commitment Energy Efficiency Scheme (CRC),
many large energy users are focusing on opportunities to reduce their consumption to not only reduce costs but also to boost their corporate environmental credentials. In a four-year, $15m study on energy
efficiency in buildings, the World Business Council for Sustainable Develop- ment[1] reconfirmed that, worldwide, buildings account for 40% of global energy consumption (and, of course, the associated carbon footprint) – significantly more than all transportation combined. The study clearly established what many facilities engineers have recognised, and acted upon: that buildings are a place where improvement can be readily made, at lower costs and higher returns than in other sectors. This article will focus on one particular, and
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important, area – the methods and benefits of lighting control – and will provide a summary of a recent case study of an office building in Manhattan, New York.
Lighting optimisation – easy fruit? The operation of many offices presents a particular environmental challenge due to the demands of the various occupiers, as well as the expectations of the building owner, which sometimes differs to that of the occupier. However, they also offer great potential for improvement. The chart[2] in Figure 1 illustrates annual UK electricity use in office buildings. It clearly shows that lighting plays a significant part in total electrical consumption. Globally, lighting contributes around 20% to office energy use. Lights in offices are often left on when no one is in the room, or kept at maximum level, even when daylight streams through the windows. In all too many buildings, lighting
11% Other 15% Lighting Computing 33%
Heating 20% >
Cooling & Ventilation
21%
Figure 1: Average electricity consumption in UK office buildings
November 2010 CIBSE Journal 63
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