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What is U Value

Chapter 10
Retrofitting for Optimal Energy Performance
A measure of the heat transfer is the heat transfer coefficient or U-value, its unit is given in W / (m 2 K). This value takes into account the heat transfer effects of convection and radiation. A small heat transfer coefficient leads to less heat loss in the heating time - the heat remains in the building. In summer, the small U-value also has a positive effect - the heat stays outside the building.
Published in Chapter:
Green Retrofit Energy Efficiency Potential on Existing Building Envelope for Residential and Non-Residential Building
Robert Staiger (E3xpert, Germany)
Copyright: © 2019 |Pages: 31
DOI: 10.4018/978-1-5225-9104-7.ch010
Abstract
The chapter deals with the green energetic consideration of today's building envelopes for residential and non-residential buildings. It investigates the energetic effects the envelopes have on energy efficiency, energy consumption, material use, sustainable use of resources, lifetime considerations, economic and ecological impact. Today's it is estimated that approximately 30% of the annual primary energy demand for residential and non-residential buildings is needed. Energy resources for heat, electricity, air conditioning and cooling purposes, fossil fuels in form of gas and liquid are predominantly used.
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