[EnergyPlus_Support] Re: green roof modelling

["Ece Mumcu" <mumcuece@xxxxxxxxx>]

Dear List

As discussed, I checked the archive and I know I need to use both precipitation and irrigation object. Hopefully for San Francisco there is a default precipitation schedule  I've also found the average annual precipitation for site:precipitation object. But what I dont get  how to create a roof irrigation schedule.(the amount of water needed(irrigation+precipitation is related to the vegetation ?) I had a look at the ecoroof orlando sample file in energy plus, for the irrigation schedule(smart) there is this explanation below.  These 1" and 0.5 " are just random amounts or they are related to a plant type. To be honest, overall it is not clear for me 
 I hope you can help me
thanks 


 Schedule for irrigation (1"/irrday summer 0.5"/irrday winter: Mon and Fri at ~10am)
 Note: UCF documentation inconsistent 1 vs 2 " in summer per week??
 To avoid stability issues with 1hour timesteps we simply add 1/7th of weekly
 precipitation evenly divided into 2 hours each of ALLDAYS each season
 Note: 0.00181 in*2hrs*7days = 1 inch per week
 m/hour


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "regen555" <ap@...> wrote:
>
> Hello,
> this was discussed earlier (search in archives). One point was that you have to activate roof irrigation otherwise the consumption will be greater with the green roof than without it!
> Regards
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Ece Mumcu" <mumcuece@> wrote:
> >
> > Dear All,
> > 
> > I am modelling a green roof for my uni project at the moment. The aim of this project will be to find out how the green roofing affects the thermal performance of a building in a cooling season in San Francisco. 
> > I will simulate the same building once with a bare roof and with a green roof and monitor the indoor temperatures in both cases or cooling loads reduction.  I am still looking for a native plant for the location if I do not find will go for sedum. However, I have very little idea how energy plus interpret the precipitation and irrigation input and how I can schedule them.In the inputoutput reference, there is this option smart schedule which (I guess)lets user combine the two but not clear.
> > So, I would be grateful if someone familiar with green roof modelling in energy plus helps me 
> > 
> > Any information about green roofing is welcome.
> > 
> > thanks
> >
>




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