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NREL / OpenStudio-HPXML

Modeling of residential buildings in EnergyPlus using OpenStudio/HPXML.
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Allow instantaneous water heaters w/ larger tank volumes #1858

Open shorowit opened 22 hours ago

shorowit commented 22 hours ago

For example, this product is called an instantaneous water heater but it has a 34 gal tank:

Presumably it's considered instantaneous because of the large burner rate.

We previously assumed that instantaneous water heaters have tank volumes <= 2 gal and thus insignificant standby losses. To handle products like this, we should allow tank volume as an input and, if it's greater than 2 gal, model it as a conventional storage water heater.

shorowit commented 22 hours ago

We should also allow HeatingCapacity for instantaneous water heaters.

shorowit commented 22 hours ago

And we should probably replace "tankless" with "instantaneous" in our code.