Online Building Energy Simulation and Optimization BESOO v201 Solar Gain in Winter

Online Building Energy Simulation and Optimization (BESOO) is a system of online internet programs that calculates temperatures, energy, and other parameters for various cases and conditions based on input values.The current version (201) includes solar radiation on the outside walls of the building and allows selection of the building orientation every 22.5 degrees.The program calculates temperatures of the outside wall layers and the air temperature in the room at a constant ambient air temperature. In addition, the program calculates TTC based on the input data.This work includes examples of the application of BESOO to determine room air temperature without space heating or air conditioning at various ambient air temperatures and thermal insulation thicknesses.The simulation shows that the maximum temperature drop for an uninsulated apartment is from 20°C to 14.2°C in 10 days in winter, while for well-insulated walls is up to 16.9°C.The program may be useful for selecting optimum building design, especially the location and thickness of insulation and thermal mass such as a concrete layer.The online internet program according to this work is available on nowagreen.com/BESO/201 (free, no login required).