This may sound like a simple request but the load is very difficult to estimate. The manufacturer should be able to give you data based upon a known load. The units are never operated at that point. The load is a function of cavity area, product flow (cycle time) and mold cooling. I have designed and built room cooling systems for clean room injection molding. The room load is very dynamic due to the molds are being continuously changed as the need for the product changes. Be very careful with humidity control.
The AEC tables are for the mold cooling. I take the total electrical power over an hour, less mold cooling (actual) and add accessories such as dryer, conveyors and portable chillers. The leftover is heat rejection to room.
Me situation is a plant addition into which they are move the existing machines. The existing machines are the main load in the existing plant. They have four 25 ton roof top units which seems like a lot. I know the building electric demand so I thought I would work backwards.
I assumed that all electric that did not go to cooling went to heat in the space (which is very conservative)
This is my very rough calculation:
Demand (KVA) = cooling load/3.41 + cooling load/SHF/EER
cooling load is the unknown sensible cooling load (internal heat). It sort of ignores the building skin load which is basically the roof and I have know idea how much ventilation(as I said very rough). It works out to 50 tons in my case.
