OTTV stands for ‘Overall Thermal Transfer Value’. It is a value that indicates the average rate of heat transfer from the outdoor environment into a building through the building envelope. The term building envelope refers to the outermost layer of a building. It includes the roof, the walls and windows of all sides.
Heat gain through exterior walls can be broken down into three components:

  • Heat conduction through opaque parts of the wall
  • Heat conduction through glass windows
  • Solar radiation through glass windows
We calculate OTTV to achieve optimum value and give the recommendation about design and selection materials on building façade with various design options