Using simulation for studying the thermal performance of windows, doors and shading devices

Abstract

A window, door and shading device system is known for its significant part of the building structure, ensuring protection from the sun, wind, rain and storms and protecting people living inside. In addition, the window, door and shading device system also affects the energy consumption of the building. These effects can be determined through thermal and optical properties of the whole system, include: thermal transmittance (U-value), solar heat gain coefficient (SHGC) and visible transmittance (VLT). The thermal and optic properties through each door product are extremly complex algorithmic formula of the temperature difference between the inside and outside the building and the solar radiation intensity on the product. Lawrence Berkeley National Laboratary (USA) has developed the calculation software as: OPTICS, WINDOW and THERM, to simplify and optimize the calculation process, avoiding errors of confusion, difficult to control and approach the formula from manual calculation. The results show that the value calculated by the two solfware compared with the value announced in the standards TCVN 11857, ISO 15099, ISO 10077; ANSI/NFRC 200-2020 is not more than 3% to meet the calculation standards.