What proportion of the load is handled by the primary air and what by the secondary coil?
If you are starting out on a design and need a feel for the division of the load between the primary air and the secondary water, allow for the primary air to handle the transmission load calculated as a steady state load. This is a quick and simple calculation using the design outdoor air less room air temperature, the areas of masonry and glazing and the respective U factors. The primary air will also handle all of the room latent load. The secondary load is the sum of the people, lights, office equipment and solar load. The first three you will have based on normal design standards or the values in a brief, and the third by reference to solar load tables or your heat load calculation program. Do not include the outdoor air load, as the primary air handler will handle this.
