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Calculating your air conditioning requirements

Heat Load

The amount of heat generated is known as the heat gain or heat load. Heat is measured in either British Thermal Units (BTU) or Kilowatts (KW). 1KW is equivalent to 3412BTUs.

The heat load depends on a number of factors, by taking into account those that apply in your circumstances and adding them together a reasonably accurate measure of the total heat can be calculated.

Factors include:

  • The floor area of the room
  • The size and position of windows, and whether they have blinds or shades
  • The number of room occupants (if any)
  • The heat generated by equipment
  • The heat generated by lighting

Floor Area of Room

The amount of cooling required depends on the area of the room. To calculate the area in square metres:

Room Area BTU = Length (m) x Width (m) x 337

Window Size and Position

If, your room has no windows, you can ignore this part of the calculation. If, however there are windows you need to take the size and orientation into account.

South Window BTU = South Facing window Length (m) x Width (m) x 870

North Window BTU = North Facing windows Length (m) x Width (m) x 165

If there are no blinds on the windows multiply the result(s) by 1.5.

Add together all the BTUs for the windows.

Windows BTU = South Window(s) BTU + North Window(s) BTU

Occupants

You will have to take that into account people who normally working in the space. The heat output is around 400 BTU per person.

Total Occupant BTU = Number of occupants x 400

Equipment

Clearly most heat in a room is generated by the equipment. This is trickier to calculate that you might think. The wattage on equipment is the maximum power consumption rating, the actual power consumed may be less. However it is probably safer to overestimate the wattage than underestimate it.

Equipment BTU = Total wattage for all equipment x 3.5

Lighting

Take the total wattage of the lighting and multiply by 4.25.

Lighting BTU = Total wattage for all lighting x 4.25

Total Cooling Required

Add all the BTUs together.

Total Heat Load = Room Area BTU + Windows BTU + Total Occupant BTU + Equipment BTU + Lighting BTU

This is the amount of cooling required so you need one or more air conditioning units to handle that amount of heat.

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Converting volt amps into btu?

This is a two-step question. First, to convert volt-amps into watts, multiply by the power factor. For a heating element like a convector or kettle the power factor is 1, but for a motor it might be 0.7. In the absence of information a power factor of 0.8 can be assumed. Watts are a measure of power and the equivalent imperial measure is BTU per second or BTU per hour. Alternatively a BTU is a measure of energy and the metric equivalent is watt-seconds or watt-hours. A BTU is 1055 watt-seconds (also known as joules). A kilowatt-hour is equivalent to 3412 BTU.


What our the mechanics of changing btu to eletrical current?

To convert BTUs (British Thermal Units) to electrical current, you first need to convert BTUs to energy in joules, as 1 BTU is approximately 1,055 joules. Then, to find the equivalent electrical current, you use the formula ( P = IV ), where ( P ) is power in watts (joules per second), ( I ) is current in amperes, and ( V ) is voltage in volts. By rearranging the formula to ( I = \frac{P}{V} ), you can calculate the current based on the power derived from the BTU conversion and the voltage of your electrical system.


What is the answer if 48000Btu is convert to Horse power?

Btu is a unit of heat.Horse power is the measurement of power.Now,in order to correlate BTU and HP,We can say BTU*TIME(Hr)*3.931e-4=Horsepower. Hence 48000 BTU Hr is 18.8 Horsepower


How many watts in 5200 btu?

0.29308323563892147 watts per btu there for 5200 btu = 1524.0328253223915 watts 1 watt=3.412Btu/hr 1 Btu=the amount of energy needed to heat 1 Lb of water 1 degree. A gallon of water weighs aprox. 8 Lbs.


How many BTU does a 10 watt led bulb create?

About 90 percent of an incandescent bulb's energy is turned into heat; one watt is 3.41 btu/hr, so 10 watts would be about 3 btu per hour.

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