Try to estimate HVAC for a 100,000 sq. ft data center that will be designed with 100 watts per square foot of power density.
I need to find a good model to determine of much of the electrical energy will be concerted to heat that the AC system must account for.
Your heat load is equivalent to 100,000 100 Watt light bulbs or 10,000 1,000 Watt electric heaters. When all equipment is operating, your maximum heat load will be 10,000 kilowatts for the heat sources you mention (are there any other loads?).
Air conditioners are often rated in Btu/hr, therefore you must convert Watts to Btu/Hr.
Watts x 3.415 = Btu/Hr (See source)
100,000 sq. ft. x 100 Watts/Sq. ft. =
10,000,000 Watts
10,000,000 x 3.415 = 34,150,000 Btu/Hr
Large air conditioners may also be rated in tons (cooling effect required to produce a ton of ice in 24 hours) See second source.
A ton (of air conditioning) is equal to 12,000 Btu/Hr.
34,150,000Btu/Hr / 12,000Btu/Hr/ton =
2,845.8 ton capacity.
Calculations are for sensible heat unless water vapor is to be condensed which depends on the desired humidity.
You should have a licensed professional engineer (PE) make final calculations and look for other important considerations before funding an air conditioning plant.
Addition: How much heat results from power consumption in a closed room will depend on what the power is used for. For example if an electric heater is used to melt a block of ice no heat will be available to heat the air. In like manner, if heat is used to warm something that is then removed from the room, some of the heat (supplied to the object) will become unavailable. But heat of friction or heat used to warm anything that remains in the room will be available to heat the air in the room. Open doors or ventilation can exhaust heat. Large motors with power factors may be a special case because of phase angles. However, most equipment such as small motors, heaters, TV sets, computers and light bulbs should convert almost all electrical energy into heat. Therefore the Watts of electricity listed on the equipment label should all be converted to the equivalent amount of heat.