Iran Nezam Mechanical Design Exam

Practice session

An exterior perimeter wall of an office building in Tabriz has a net surface area of 40 m² and an overall heat transfer coefficient (U-value) of 0.45 W/(m²·K). If the indoor winter design temperature is 21°C and the outdoor winter 99% design dry-bulb temperature per INBR Topic 14 is -5°C, what is the design steady-state transmission heat loss through this wall?

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