RE: [EnergyPlus_Support] sky clearness and solar model indicator

I believe that Meteonorm can generate an synthetic weather file with always clear sky.

Ned Lyon, P.E. (MA, WV)
Staff Consultant

SIMPSON GUMPERTZ & HEGER
781.907.9000 main
781.907.9350 direct
617.285.2162 mobile
781.907.9009 fax
www.sgh.com

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Friday, April 24, 2015 7:57 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] sky clearness and solar model indicator

Thanks Joe for replying so fast.

Let me see if I can unsderstand that.

You are suggesting to use the ASHRAE Clear Sky Model, but I would have the same problem: that I can only use it on design days, and not for the whole year weather file.

Than you suggest to get the radiation values for each 21st of each month and repeat for all the other days of that month. All this configuring the Design Days? 365 design days ?

As I said I`m trying to evaluate the incident solar radiation with no clouds during the whole year. I would like to have the radiation just changing with the solar geometry for my latitude, and not influenced by clouds.

Thanks again for your time.

---In EnergyPlus_Support@xxxxxxxxxxxxxxx, <YJHuang@...> wrote :

It sounds like you want to modify the solar radiation on the weather file to be always clear, i.e., with Cloud Cover of 0. Algorithmically this is quite straight-forward, just run the ASHRAE Clear Sky Model for all days. Unfortunately, although the ACSM is quite simple, you will need to give it the solar altitude every hour. What you might do is to save the solar radiation values from the design runs as you have described for the 21st of each month, and repeat those for all days of that month. The errors would be minimal.

Sent from my iPhone

Joe Huang

White Box Technologies

346 Rheem Blvd Suite 108D

Moraga CA 94556

(o) 1(925)388-0265

yjhuang@...

On Apr 22, 2015, at 6:08 PM, "Matheus Tonelli Santos mtonellis@... [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

Hello.

I`m trying to simulate the radiation for the whole year with the clean sky.

I`m currently doing this with the design day at the solar model indicator setting the sky clearness to 1. But it`s just for a design day. Is there any way I could set the sky clearness to 1 for the whole year?

I`m trying to evaluate the incident solar radiation with no clouds during the whole year. Can somebody help me with that ?

Thanks for your time.

arquiteto matheus tonelli santos

arquiteto matheus tonelli santos

base 3 arquitetos

matheus@...

www.base3arquitetos.com.br

55 11 98248 0286

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Posted by: "Edward G. Lyon" <EGLyon@xxxxxxx>

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