0 Energy Consumption -------------------------------------------------8-10

4.1 HEAT LOAD CALCULATION (NEW)

Total heat calculation ( Btu/hr ) :

1) Measure your room or space area ( width x length ).Use a metric unit for measurement ( meter ).Multiply with 700 to get in Btu/hr

• Room area = 4 meter x 3 meter = 12 m2

• Btu/hr = 12 x 700 = 8400 Btu/hr 2) Estimate occupant for this room. Multiply with 500 to get in Btu/hr

• 1 peoples x 500 = 500 Btu/hr 3) Estimate the heat from electrical equipment .Refer wattage for equipment and multiply with 3.5

• Hair dryer = 100 watt, Computer : 200 watt, lighting : 64 watt,ceiling fan:49.25watt ; Total : 413.25watt

• so 413.25 watt x 3.5 = 1446.375 Btu/hr 4) Total Btu/hr =8,400 Btu/hr + 500 Btu/hr + 1446.375 Btu/hr = 10346.375 Btu/hr 5) To get air-conditioner sizing, we must divide Total heat ( Btu/hr) with 9800 Btu/hr

• 10346.375 / 9800 = 1.056 hp 6) From this answer we can estimate to choose a 1 Hp of air-conditioner for this room.

My room has a 1.5HP air conditioner , but in my head load calculation of remaining older electrical equipment, the result of calculation shows that 1.0hp is enough for this room.

Total heat calculation ( Btu/hr ) :

1) Measure your room or space area ( width x length ).Use a metric unit for measurement ( meter ).Multiply with 700 to get in Btu/hr

• Room area = 4 meter x 3 meter = 12 m2

• Btu/hr = 12 x 700 = 8400 Btu/hr 2) Estimate occupant for this room. multiply with 500 to get in Btu/hr

• 1 peoples x 500 = 500 Btu/hr

3) Estimate the heat from electrical equipment. Refer wattage for equipment and multiply with 3.5

• Hair dryer = 100 watt, Computer : 200 watt, lighting : 67 watt, ceiling fan:22watt ; Total : 389 watt

• so 389 watt x 3.5 = 1361.5 Btu/hr 4) Total Btu/hr= 8,400 Btu/hr + 500 Btu/hr + 1361.5 Btu/hr = 10261.5 Btu/hr 5) To get air-conditioner sizing, we must divide Total heat ( Btu/hr) with 9800 Btu/hr

• 10261.5 / 9800 = 1.047 hp 6) From this answer we can estimate to choose a 1 Hp of air-conditioner for our room.

After adding the wattage of new lightings into the calculation, it shows that 1.0HP is enough for the room . Although adding more lightings in the room , the calculation shows that 1.047HP is lower than the old heat load calculation of 1.056HP .