Design Days are here!
Maybe you already know about Design Days, but did you know that Energy Modeling was basically invented to determine the design day, and the design hour?
What is a Cooling Design Day and why is it important?
The Cooling Design Day is effectively the "worst case" day for your air conditioning loads. The "worst case" hour of this day determines equipment capacity, fan sizes, and subsequently duct sizes. This largely impacts first cost. The Design Hour also impacts peak KW demand which often has a huge impact on the utility bill.
When is the Design hour?
A common rule of thumb is that the design hour occurs during July at 15:00...