Exploring the effect of longwave radiation exchange on the energy balance of building facades in subtropical regions

摘要

The energy balance of the building facade affects the accuracy of building energy prediction. Although algo-rithms for energy balance have been applied in building energy simulation software, the longwave radiation exchange of building facades is often considered in a simple (implicit) way. This study proposes the concept of ambient equivalent temperature for quantifying the longwave radiation emitted by other buildings and trees in the surrounding environment. A more detailed radiation transfer model was developed to assess the energy balance of the longwave radiation of building facades. The input parameters of the model were simplified and the applicability of the model was improved by fitting the ambient equivalent temperature and meteorological parameters. Through quantitative and qualitative analysis, the effect of view factor parameters on the model output was assessed, and a universal value for the sky view factor (SVF) was determined to calculate the longwave radiation exchange of the building facade. The calculation accuracy of the longwave radiation was 71.4% higher in the simplified SVF model than in the original model. These findings provide a more accurate method for calculating the longwave radiation energy balance of building facades and have implications for building energy prediction and building energy efficiency design.

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