COMBINED HEAT AND POWER 1 CIBSE GUIDE
included. AM12 also provides a snapshot of the current position of other influencing instruments, such as the Quality Assurance for Combined Heat and Power (CHPQA) scheme, the Climate Change Levy exemptions and the Climate Change Agreements.
Assessment and appraisal One of the key areas in the guide – and its longest section – is on ‘Feasibility Studies’. Although much of the technology in commercial CHP systems is considered mature and well tested, the variability of heat demands and the electricity supply network can make comparative feasibility studies demanding and problematic. This updated section provides a route
The revised CIBSE guide includes the methodologies required to assess the viability of CHP, its procurement, installation, commissioning, operation and maintenance
The authors of the updated AM12 are confident that properly applied CHP is a technology that can reduce emissions as well as being cost-effective in many applications
Environmental and regulatory requirements The regulatory requirements have seen a significant overhaul since the previous edition. Although much of the technological guidance in AM12 is applicable worldwide, the regulatory commentary is specifically orientated towards the legislation that affects much of the UK (for example Part L of the Building Regulations and the London Plan). That is not to say that this legislative guidance is not being echoed across Europe and beyond, and so the mechanisms explored in this guide to assess compliance (or simply performance) should be usefully adaptable to other global applications. As a result, AM12 now has new, separate
sections entitled ‘Environmental Impact of CHP’ and ‘Legislation and Regulations that affect CHP’. Methods for the calculation of CO2 and NOx emissions, together with mitigation techniques, are included (as well as for other environmental impacts, such as noise and vibration). The authors were very aware of the
debates published in CIBSE Journal over the past year on the need for responsible calculation techniques, so they endeavour to illustrate robust methods showing that the potential variations in savings will depend on the assumptions of which power stations are displaced by the CHP operation. In addition to an overview of the related legislative and planning needs, the treatment of CHP by BREEAM and the Code for Sustainable Homes is also now
36 CIBSE Journal December 2011
through the methodical assessment of the technology to provide engineers with the information to produce a feasibility report that contains both technical specification and life-cycle justification. It also provides guidance on the structure of the resulting feasibility report. Topics covered include:
l Data gathering requirements (loads and temperatures);
l Initial technical evaluation; l CHP performance and heat recovery options;
l Optimum sizing of CHP (including software and models);
l Integration with other technologies; l Economic appraisal including sensitivity of results; and
l Financing options. AM12 recognises the need for
the designer to have a reasonable understanding of the installation, operation and maintenance needs of CHP systems. And so the later sections provide some detail of typical maintenance regimes that are clearly underpinned by systematic processes of monitoring and recording. The guide is undoubtedly unique in that
it bridges the technological and operational needs of applying successful CHP in commercial and residential applications. However, its key strength is that it provides an accessible and usable toolkit for the designer when attempting to establish the true benefit of CHP.
l Professor Tim Dwyer is a teaching fellow at Universith College London. The new AM12 has been written by Paul Woods of AECOM. Phil Jones of the CIBSE CHP and Energy Performance Groups chaired the AM12 steering group. The guide is expected to be published soon. To obtain a copy, visit
www.cibse.org/bookshop
www.cibsejournal.com
Baxi Senertec
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