Room Cooling Loads and Airflow Requirements

A plan or diagram showing thermal zones, thermostat locations, diffuser locations, VAV Box locations and duct routing, with ducts sized.

As per the given dimensions for ceiling, beam and duct work, Floor to floor height is 12 ft 4in, and beams take up 2 ft. floor to ceiling height is 8ft 6in. We are left with 1ft 10 inches height for ductwork. Since the ducts are 1 inch insulated we are left with 1ft 8in as the maximum height for the duct.

We have two kinds of ducts low pressure ducts that are with velocity 750 ft per minute, and medium with velocity 1250 ft per minute.

Diffusers of 2by2 ft are used that are used to diffuse 200 cfm

Assuming Friction Allowance needed to calculate duct sizing, as 1.

We calculate duct sizes for each room using the formula;

Area (SF) = (Volume of Air (CFM) / Velocity(FPM) ) X (Friction Allowance)

I chose to have medium pressure ducts with rooms of either high occupancy or cooling load and low pressure with rooms of lower cooling load. The ducts are assumed as rectangular

Room No. Space Tag Air flow Req. (CFM) Cooling Load (BTU/Hr)

126 Integrated AM+PM 1065 20700128 OT/PT 577 11200131 OT/PT 577 11200125 SLP Office 222 4300124 Integrated AM+PM 1060 20600132 Integrated AM+PM 1060 20600135 Conference 623 12100

C104 Corridor 443 8600119 ITIN Office 391 7600

C105 Corridor 998 19400136-137 General Office 623 12100

137 Medical Suite 448 8700103 Director Office 335 6500104 Staff Lunch 335 6500105 Conference 535 10400106 ETS Office 165 3200107 Sub-Separate ILP-Individual 695 13500109 Sub-Separate ILP-Interactive 695 13500108 SLP Office 245 4752

C102 Corridor 669 13000111 Sub-Separate ILP-Full-Day 1065 20700112 SLP Office 222 4300113 Integrated AM/Sub-Separate ILP-Lite PM 1060 20600114 Motor Room 875 17000117 Psych 253 4900118 Breakout 170 3300

115+102 Parent Waiting + Lobby 1667 32400

Following images show the 200 CFM diffusers, VAV boxes and the duct lines, from VAV to diffusers are low pressure and from the supply line to VAV are Medium pressure lines. The first image shows the thermal zones for the building, and the 2nd and 3rd image is duct and supply position and duct tracks

Room No. Space Tag No. of diffusers+VAV DUCT size(ft2)

126 Integrated AM+PM 5+1 0.852128 OT/PT 4 0.769131 OT/PT 4 0.769125 SLP Office 2 0.296124 Integrated AM+PM 5+1 0.848132 Integrated AM+PM 5+1 0.848135 Conference 3 0.831

C104 Corridor 2 0.591119 ITIN Office 2 0.521

C105 Corridor 5 0.7984136-137 General Office 4+1 0.831

137 Medical Suite 1 0.598103 Director Office 2 0.447104 Staff Lunch 2 0.447105 Conference 3 0.714106 ETS Office 1 0.22107 Sub-Separate ILP-Individual 4+1 0.927109 Sub-Separate ILP-Interactive 4+1 0.927108 SLP Office 2 0.327

C102 Corridor 4+1 0.892111 Sub-Separate ILP-Full-Day 5+1 0.852112 SLP Office 2 0.296113 Integrated AM/Sub-Separate ILP-Lite PM 5+1 0.848114 Motor Room 4 0.7117 Psych 2 0.338118 Breakout 1 0.227

115+102 Parent Waiting + Lobby 8+2 1.336