Consider the design of a small office building with the following specifications:

Site Phoenix, AR (Lat = 33.42)

Ti constant 24 h/day at 72F (22.2C) in summer

Size 60 ft 40 ft 10 ft (18.18 m 12.12 m 3.03 m), orientation due south

Open floor plan to allow treating it as one zone

Equal windows on all facades, with window/wall ratio=0.25

1.0 air change per hour from 8:00 a.m. to 6:00 p.m., 0.2 air change per hour the rest of the time

Double-pane, low-e glass

Two standards wood doors in N/S: 0.350 Btu/( h-ft2-F)

Lights and office equipment 3.0 W/ft2 (32.28 W/m2) from 8:00 a.m. to 6:00 p.m., 0.5 W/ft2 (5.38

W/m2) the rest of the time

Occupants 0.01 per square foot (0.108 per square meter) from 8:00 a.m. to 6:00 p.m.

Roof type 3 in the HCB tables, color dark, without suspended ceiling

Wall group D in the HCB tables with 2-in insulation

Foundation:

Slab-on-grade with 8-inches foundation walls and vertical board insulation on outside foundation

wall. R value of insulation 5.4 ( h-ft2-F)/Btu

6-Specify the HVAC unit in terms of; supply air (in CFM), fresh air requirements, SHF for the

room, and type of condensing cooling unit. Draw a schematic of this AHU and sketch the

processes in a psychrometric chart. You may assume the flow leaves the condensing unit at

least at 45F.