Journal
ENERGY
Volume 221, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2021.119840
Keywords
Attics; Residential buildings; Techno-economics; Switchable insulation systems; Dynamic insulation materials; Retrofit
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This study evaluates the cost-benefit of retrofitting attics with switchable insulation systems (SISs) in existing US residential buildings. The analysis shows significant energy savings and cost effectiveness of deploying attic-integrated SIS insulation compared to static insulation in various US locations with different climates.
This study evaluates the cost-benefit of retrofitting attic using switchable insulation systems (SISs) for existing US residential buildings. For the retrofit analysis, the SIS insulation, is operated using 2-step temperature based controls and its energy performance is compared to that achieved by static code-required insulation installed in attics of detached homes located in 44 US locations. The analysis results show significant correlations between source heating/cooling energy savings and degree-days as well as sol-air temperatures used as climate indicators for the US locations. In addition, it is found that the potential energy savings achieved by attic-integrated SIS insulation retrofit vary widely by climate ranging from 14 kWh/m(2) to 51 kWh/m(2). For all US locations, the analysis indicates that deploying the attic-integrated SIS can provide higher cost savings compared to static high R-value insulation. Based on a breakeven cost analysis, the annual energy cost savings when replacing the existing insulation with attic-integrated SIS range from $0.05/m(2) to $1.57/m(2) depending on the climate. The additional cost for the deployment of SIS insulation can be on average 55% more than the current static insulation US prices to ensure its cost-effectiveness as a retrofit measure for attics of US residential buildings. (c) 2021 Elsevier Ltd. All rights reserved.
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