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Rainfall in EnergyPlus #4714

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lklawrie opened this issue Feb 4, 2015 · 2 comments · Fixed by #9177
Closed

Rainfall in EnergyPlus #4714

lklawrie opened this issue Feb 4, 2015 · 2 comments · Fixed by #9177
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NewFeatureRequest This "issue" is a new feature request, not a defect report

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@lklawrie
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lklawrie commented Feb 4, 2015

There are three methods dealing with rainfall/liquid precipitation in EnergyPlus:

  1. liquid precipitation amounts on the epw files (for older files, uses present weather and a set of 3mm - as I remember)
  2. Site:Precipitation object
  3. RoofIrrigation (for Ecoroof). - Irrigation is not exactly rainfall but perhaps should be integrated.

Site:Precipitation is used in the WaterUse:RainCollector object (that is the precipitation feeds that object).
Site:Precipitation is also used in Material:RoofVegetation (but Material:RoofVegetation does not use precip from the epw file if these is not Site:Precipitation object) MJW 17 Feb 2022

Liq Precip on the weather file currently only sets the "israining" flag which, in turn, changes the convection coefficient (outside) if the surface is wet. is not used for anything. (see below.)

Suggestion is that these should be integrated.

Possibly, the Site:Precipitation object will be more detailed than amounts from the hourly weather file. Ergo, perhaps the Site:Precipitation values should override any values from the weather file. On the other hand, if there is no Site:Precipitation object, then values from the weather file should feed the WaterUse:RainCollector object. Not sure where the RoofIrrigation object fits into the scheme of things.

@mjwitte
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mjwitte commented Nov 15, 2016

Related to #4153. Also, Site:Preciptation feed the ecoroof, rainfall in the epw file does not. Ref. helpdesk ticket 11702.

@mjwitte
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mjwitte commented Jul 31, 2018

As of this commit in April 2012, the liquid precipitation amounts in the epw file are not use for anything. Code was researched in response to Unmethours 33199.

@jasondegraw jasondegraw added NewFeatureRequest This "issue" is a new feature request, not a defect report and removed suggestion labels Oct 11, 2018
@xuanluo113 xuanluo113 linked a pull request Nov 8, 2021 that will close this issue
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Labels
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4 participants