HVAC Strategies for Well-insulated Airtight Buildings, ISBN-13: 978-1903287187
[PDF eBook eTextbook]
- Series: CIBSE TM (Book 29)
- 48 pages
- Publisher: Chartered Institution of Building Services Engineers (June 30, 2002)
- Language: English
- ISBN-10: 1903287189
- ISBN-13: 978-1903287187
This publication explores the potential for high performance building envelopes to simplify the design and operation of HVAC systems. The keys to such high performance envelopes are windows with low U-values and good solar protection, coupled with good structural airtightness. These features are readily attainable at marginal cost through careful design and construction. Indeed, industry will be driven in this direction by changes in the 2002 edition of Part L of the Building Regulations. The practical achievement of high performance envelopes can deliver the following commercial benefits:
— Eliminate the need for perimeter heating, plus enable significant reductions in the installed capacity of heating and cooling plant. This will reduce the capital costs for HVAC plant.
— Free up valuable perimeter space in addition to saving some distribution and plant room space by eliminating perimeter heating. This will add significant commercial value to the scheme.
— Allow simplification of the controls installation and strategy, again reducing costs but also improving manageability and maintainability.
— Enable HVAC systems to operate at very high efficiencies, thereby resulting in low operating energy consumption.
— Improve the investment profile: the envelope has a longer service life than the HVAC plant, so the investment shifted from savings in plant to additional cost in the envelope can be amortised over a longer period, generating further indirect financial benefit.
— Provide good comfort: climate chamber tests coupled with detailed computer modelling work suggest that even with significant areas of glazing, good year-round comfort can be maintained.
This publication outlines the evidence for this approach based on the results from a comprehensive series of climate chamber tests and a range of detailed computer modelling studies.
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