A 20 ft x 40 ft surface and 12 ft height one story office building is located in a city in South Florida (wet location with mean daily temperature range of 16 ⁰F). The office is facing north. The adjoining offices on the east and west sides are conditioned. On the south side of the office there is a non-conditioned and non-covered parking lot.

Roof Construction: Flat masonry with built-up roofing, and a suspended ceiling under naturally vented attic (light). U = 0.112 BTU/h-ft2-F.
North and South Wall Construction: Masonry cavity walls. U = 0.128 BTU/h-ft2-F.
Floor Construction: 4 in. concrete on ground.
Windows: One facing north and one facing south 4 ft x 6 ft windows of regular single glass with venetian blinds.
Doors: Two 4 ft x 7 ft wood doors, one facing north and one facing south.
U = 0.2 BTU/h-ft2-F.
Outdoor Design Conditions: T(wb) = 82 ⁰ F ; RH = 60 %.
Indoor Design Conditions: T(db) = 75 ⁰F; T(wb) = 62.5 ⁰F.
Occupancy: 10 office workers.
Lights: 5 kW; fluorescent.
Equipment: 1 frost-free refrigerator and 4 computers (assume 4000 BTU/computer-day).

Calculate:
a) T(db) outside.
b) Cooling load due to heat gain from lights, people and equipment.
c) Cooling load due to roof doors and walls.
d) Cooling load due to windows.
e) Cooling load due to ventilation or infiltration.
f) Sensible heat gain.
g) Latent heat gain
h) Required Tons.
i) If the duct equivalent length is 120 ft., the maximum velocity is not to exceed 1300 fpm, and no more than 1000 cfm of air is to be delivered through the duct, find the total friction loss in the duct.
j) If the duct high can not be more than 15 in., find the dimensions of the rectangular duct connected to the fan output.