Free Engineering Simulation Tutorial - Opensource Software & Simulation Guides

Here's the problem with most online "AC calculators": they multiply your floor area by a single number and call it a day. But a 15×12 bedroom with two shaded north windows and a well-insulated wall needs a completely different air conditioner than the same size room with big west-facing glass under an uninsulated roof — sometimes twice the capacity. Floor area alone can't see that difference. The calculator below can, because it uses the real component heat-gain method from ASHRAE and ACCA Manual J — the same physics HVAC engineers use. Enter your room's actual construction and get a genuinely accurate cooling load, ready for a real purchase decision. Figure 1. A real cooling load is the sum of heat entering through every surface — walls, windows, roof — plus solar radiation through glass, air leakage, and heat from people and equipment. Accurate AC sizing means adding all of these, not guessing from floor area. Table of Contents The R...