Normally, the load shown in the estimated cooling peak loads component has higher values than those presented in the peak sensible loads. In my case, the loads shown in the HVAC sizing are higher than the sum of the estimated ones. Where can the breakdown of the calculated loads be found?
Time of Peak Load: 1/15 07:00:00 Outside Dry Bulb Temperature [C]: 32.00 Outside Wet Bulb Temperature [C]: 23.83 Outside Humidity Ratio at Peak [kgWater/kgDryAir]: 0.01523
Zone Dry Bulb Temperature [C]: 23.99 Zone Relative Humidity [%]: 67.65 Zone Humidity Ratio at Peak [kgWater/kgDryAir]: 0.01264
Supply Air Temperature [C]: 14.00 Mixed Air Temperature [C]: —
Main Fan Air Flow [m³/s]: 13.64 Outside Air Flow [m³/s]: 2.41
Peak Sensible Load with Sizing Factor [W]: 219137.12 Difference Due to Sizing Factor [W]: 28583.10 Peak Sensible Load [W]: 190554.02
Estimated Instant + Delayed Sensible Load [W]: 75226.13 Difference Between Peak and Estimated Sensible Load [W]: 115327.89
Yes, that is because of the sizing factor. Most engineers use a safety factor to slightly oversize the equipment a little above the exact value of the peak load to help account for unexpected things in the future. If you don’t want safety factors to be used at all, you can always use the HB Sizing Factor component to set the _heating_fac_ and _cooling_fac_ to 1 instead of the default (1.25 for heating and 1.15 for cooling).
The sizing factor is applied to obtain the difference Difference Due to Sizing Factor [W]: 28583.10, but when we compare it with Estimated Instant + Delayed Sensible Load [W]: 75226.13, the value Difference Between Peak and Estimated Sensible Load [W]: 115327.89 is much greater than 1.15.
You have pasted a lot of numbers here, @allans.cypriano , and I’m actually not sure which two you are comparing. Is there a number output from a Grasshopper component that you have not posted here yet?
If so, do you have a sample .gh file that you can compare against the HTML table you pasted above?
FYI, if I am just misunderstanding that you’re only comparing numbers in the E+ HTML table and you are not asking about numbers output from any Grasshopper component, it might be better to either check if there is any explanation in the EnergyPlus Input/Out Reference or post a question on Unmethours, which is the forum specifically for E+ questions:
