Window Tool

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Description


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Description:

The Window tool provides an overview regarding life-cycle costs, hygiene and comfort for comparison of different windows. Easy to use by choosing windows and locations from a list. Manual input also possible for experts. The live cycle costs are adjusted by consumer price index and construction price index to a specific country and year.

Input:

Choose of a climate data set from a list or manual input of ambient climate as well as shading characteristics Temperatures the specific location. Indoor climate characteristics. Geometric and thermal properties of windows by choosing from a list or manual input. Investment costs of windows. Costs for heating energy, service life and interest rate.

Output:

U-values of the window, heat losses and gains, energy balance of the window. Evaluation of the window regarding comfort and hygiene. Life cycle costs of the window, figure that compares different variants.

Strength:

Provides an overview regarding life-cycle costs, hygiene and comfort for comparison of different windows. Easy to use by choosing windows and locations from a list. Manual input also possible for experts. The live cycle costs are adjusted by consumer price index and construction price index to a specific country and year.

Challenge:

Summer climate data are available for locations in the climate data list. Other summer climate data have to be provided by manual input. The life-cycle cost adjustments based on the consumer price index to convert prices from one country to another are giving only a rough estimation. The life-cycle cost adjustment for the construction price index is using the index for Germany. To have a precise adjustment for other countries overwriting of Germany’s data manually by the index from the recent country is possible.

Outcome:

The “Window Tool” provides an overview regarding life-cycle costs, hygiene and comfort for comparison of different windows. For locations in Germany it is proven, that high energy efficient windows (with higher investment costs) are leading regularly to lower life-cycle costs compared to standard windows (see figure below). By enabling people to test that with this tool themselves, they might be convinced to go for more efficient windows and by that reducing the impact of buildings on climate change.

Acknowledge:

The tool includes the equations of the Hygiene tool elaborated in AZEB. The tool contains the outcomes (thermal data and prices) of the COMPONENT AWARD 2019, Windows for the future, which was also part of the AZEB-Project.

Format:

Microsoft Excel and operates under Microsoft Windows