Home › MCQs › Architecture Engineering › Question #2366
Back to Questions
Architecture Engineering QUESTION #2366
Question 1
In the context of Green Building design, the Overall Thermal Transfer Value (OTTV) is a metric used to evaluate:
  • The amount of heat generated by building occupants and equipment per unit floor area
  • The total heat gain through the building envelope (walls, roofs, and fenestration) per unit area of the building facade, used to set energy performance benchmarks✔️
  • The coefficient of performance (COP) of the HVAC system
  • The total solar radiation incident on the building roof per year
Correct Answer Explanation
OTTV (Overall Thermal Transfer Value, in W/m²) is an energy code metric used in tropical and subtropical regions (including ECBC in Pakistan/India) that quantifies the total heat gain through the building envelope per unit external wall area. It accounts for conduction through opaque walls, solar radiation through windows (WWR, SHGC), and conductive heat through glazing. A lower OTTV indicates a more thermally efficient building envelope.