Abstract
In general, static tools and simplified assessment approaches are still dominating the Danish building energy retrofit market. These static tools are generally associated with a large number of assumptions and tend to neglect the overall building dynamics. This leads to major uncertainties and substantial gaps between the predicted performance, promised before retrofitting, and the real building performance after carrying out the retrofit project. To overcome these challenges, this work presents the design, development and demonstration of DanRETRO, a tool for Danish buildings energy retrofit design and evaluation. The tool uses a large database of dynamic performance simulations employing EnergyPlus, for different building types, ages and sizes, allowing a preliminary assessment of the technical, economic and environmental impacts of various retrofit measures. In this regard, the tool provides a large selection of retrofit techniques and measures along with retrofit packages. DanRETRO is intended to be a comprehensive building energy retrofit assessment tool, but at the same time being simple to use with minimal inputs. The demonstration of the tool in an office building, a single-family house and an apartment in Denmark is presented and assessed. DanRETRO evaluation results are aimed to serve as a basis to aid energy retrofit projects decision-making.
Highlights
Buildings in Denmark consume around 40% of the overall country energy consumption with a substantial share in the greenhouse gas emissions [1]
There is some difference in terms of the buildings base-case labelling as both the apartment and the office building are classified as level ‘D’, based on the Danish building regulation categorization, whereas the single-family house is labelled as ‘F’, with a baseline primary energy consumption exceeding 250 kWh/m2.year
For the single-family house case, it is shown from the results that the retrofit measures could improve the building performance drastically, none of these measures can raise the building label to ‘C’
Summary
Buildings in Denmark consume around 40% of the overall country energy consumption with a substantial share in the greenhouse gas emissions [1]. With the current status of energy retrofit projects in Denmark and the expected projects in the upcoming two decades, there is an urgent need for more comprehensive and systematic tools to aid the holistic building energy retrofit decision making, taking into consideration the technical, environmental and economic impacts. In this context, this study presents the design, development and demonstration of DanRETRO, an alternative tool for Danish buildings energy retrofit design and evaluation. DanRETRO design, development and implementation in an office building, a single-family house and an apartment in Denmark is presented and assessed
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