Answered: wall/window is exterior. Assume the…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A school classroom is 6 m long, 6 m wide and 3 m high. There is a 2.5 m x 4 m window in the east wall. Only the east wall/window is exterior. Assume the thermal conditions in adjacent spaces (west, south, north, above and below) are the same as those of the classroom. Determine the cooling load at 9:00 am, 12:00 noon on July 21. Other known conditions include: Latitude = 40o N Ground reflectance = 0.2 Clear sky with a clearness number = 1.0 Overall window heat transmission coefficient = 7.0 W/m2.K Room dry-bulb temperature = 25.5°C Permissible temperature exceeded = 2.5% Schedule of occupancy: 20 people enter at 8:00 am and stay for 8 hours Lighting schedule: 300 W on at 8:00 AM for 8 hours Exterior wall structure: • Outside surface, A0 • Face brick (100 mm), A2 • Insulation (50 mm), B3 • Concrete block (100 mm), C3 • Inside surface, E0 Exterior window: • Single glazing, 3 mm • No exterior shading, SC = 1.0

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