How can the heat generated by electrical equipment be estimated?

The heat load for, say, an industrial production space is calculated by summing the heat loads of the electrical equipments installed. The environmental and HVAC engineering crew obtains the information directly from the equipment manufacturers. In the case of motors, pumps, ovens, dryers, etc., each manufacturer has the statistics available. They are usually not included with the equipment, but may be obtained from the folks who make the units when more precise and detailed workspaces are being considered or set up. It usually only takes a few phone calls or faxs to get the ball rolling.