Air conditioning calculator

Cooling load and air conditioner selection to ASHRAE method

Room

Room type

Area, m²

Height, m

Storey

Glazing

Window area, m²

Orientation

Glazing type

Blinds or curtains fitted

Occupants and lighting

Number of people

Activity

Lighting load500 W

Equipment

Computer (300 W)

Monitor (50 W)

Printer (100 W)

Server (500 W)

Refrigerator (150 W)

Coffee machine (1500 W)

Climate

Outdoor t32°C

Required t24°C

Required duty

3.7

kBTU/h

kW (selected)

Simplified calculation by area:6.0 kW

Heat load distribution

Occupants500 W (16%)

Sun1800 W (56%)

Lighting450 W (14%)

Equipment0 W (0%)

Envelope elements240 W (8%)

Infiltration201 W (6%)

Total heat gains:3191 W

Energy use

1.15 kW

Power input

1147

kWh/year

EER = 3.2 (class A), 1,000 running hours a year

Recommendations

Split system

Wall-mounted air conditioner 5 kW (17060 BTU)

Help

BTU (British Thermal Unit) — 1 kW ≈ 3,412 BTU/h.

EER (Energy Efficiency Ratio) — the higher the figure, the cheaper the machine is to run.

Calculated to ASHRAE method, counting every source of heat gain.