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A New Approach To Existing Building Energy Efficiency - ebook

A New Approach To Existing Building Energy Efficiency - ebook
SKU ee/usd/issu/ebook/000
Author US Department of Energy
Binding PDF - 70 pages
Our price: £0.00
Qty 1 (this product is an ebook)

Foreword from the document

the challenge

Estimates say that in 2035, 65% of commercial building stock will have been built prior to 2010. of that existing building stock 45% will undergo renovation. to set aggressive goals for carbon reduction and deal with growing demand it is clear that we must have sophisticated strategies to drive down energy cost for these existing buildings. this has been recognized by some government entities, these early adopters are evaluating and regulating energy use of existing buildings – similar to the way new construction and renovations are regulated. new York city and San Francisco, among others, have adopted ordinances that require existing buildings to be benchmarked, to publicly disclose energy use, or even engage in energy efficiency audits and improvements. california and washington, as well as several municipalities, have laws that require owners to disclose energy use information when the building is financed, sold or leased. this is all in the context of model energy codes that are rapidly increasing efficiency requirements: the latest version of the model energy efficiency code (Iecc 2012) raises efficiency by approximately 30% over the 2006 version.

There are also private efforts underway to share data about buildings - including energy use and carbon impact. one example is the website honest Buildings (www.honestbuildings.com) which is meant to be an online portal and database for existing buildings. the image on the following page shows a map of downtown San Francisco from the honest Buildings site. Green circles indicate buildings that comply with the requirements of the San Francisco existing commercial Buildings ordinance, red circles indicate non-compliance. with such publicly available information, energy efficiency can become a marketing advantage - or a liability in the case of energy inefficiency. Institutional owners, and some developers, have also started to recognize energy efficiency as a hedge against energy price volatility and future carbon regulation. these developments may start to change the traditional value proposition of energy efficiency improvements. currently, cost savings is the primary driver of energy efficiency improvements in commercial buildings. Lower operating costs result in direct savings and can also increase the building’s value. common energy efficiency improvements include: replacing light bulbs and lighting controls, replacing or upgrading windows and improvements to mechanical systems or controls. these measures can be affordable and result in significant savings. however, for many existing 14 Source: http://www.honestbuildings.com/sf-ecb buildings some or all of these steps have already been taken.

So what are the options when the building still falls short of new regulatory requirements or the marketplace? one of the primary goals of the Dumbach hall project was to provide a new framework to conceptualize energy improvements for existing buildings. the inspiration was cuneo hall, a new high performance academic building achieving a 50% energy performance improvement beyond aShrae 90.1-2004, an energy efficiency code. the two buildings are similar in layout, size and use so they were ideal for this investigation. Using the concepts and strategies from cuneo and the historic Dumbach hall the team conducted a comparative study of the various energy efficiency strategies. this study included extensive energy modeling and cost estimating to compare the relative merits of suites of improvements. the team also analyzed Dumbach to find unique opportunities for energy savings. while most projects cannot afford such an extensive analysis, this study builds a more sophisticated toolbox to push the energy efficiency of existing buildings forward. It also illustrates the value of a well designed efficiency analysis and plan for a building that accounts for future building changes and also synergies between the various energy efficiency measures

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