HSLU develops tool to avoid heat islands in the neighborhood

Lucerne University of Applied Sciences and Arts (HSLU) has developed an interactive neighborhood climate model that aims to deliver results in a matter of seconds. It was tested in the Suurstoffi district in Rotkreuz.

The neighborhood climate in Suurstoffi, calculated by the new HLSU model (Image: HSLU)

In view of climate change, it is becoming increasingly important to avoid heat islands when planning larger districts. The positioning of buildings, the choice of materials for façades and outdoor areas, green spaces and clever shading are decisive factors here - factors that should actually be taken into account at an early planning stage. In practice, however, such models are not used, as the calculations sometimes take several days and are expensive.

The Lucerne University of Applied Sciences and Arts (HSLU) has now presented a new interactive neighborhood climate modeling (QKM). According to the HSLU, it is limited to phase-specific information and delivers results in a matter of seconds. In contrast to existing methods, the HSLU model focuses on the aspect of the neighborhood climate and works with fast-calculating algorithms. It takes seconds or at most a few minutes to calculate the effects of a change. The tool can be used from the first step in the planning process by the planners themselves. For example, it can be used to compare two variants of façade design or the planting of trees in an inner courtyard with little effort.

According to HSLU, the interactive neighborhood climate modeling obtains the information on the planned buildings, their position, the materials used or the type and position of green spaces and trees from the Revit planning tool, which is already used in architecture and landscape planning offices. From this, the physical model calculates the effect of radiation, shade, heat storage properties of the materials, air flow, vegetation and time of day on the neighborhood climate. Images with color scales show the results in an intuitively understandable way. The calculations of the model were checked with measurements in the Suurstoffi district in Rotkreuz; the results were compared with the calculations of the software previously used. The agreement with both the on-site measurements and the results of other software was high. This means that the tool is much faster with the same accuracy. (ah)
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