[Bldg-sim] Reliable dataset of diffuse irradiance measured on horizontal and vertical surfaces

[Chuck Khuen]

Yeonsook,

Since we use the Perez algorithm to split Global Horizontal into Direct and Diffuse in our global weather data platform as part of the input stream to support building and energy modeling, we would love to see your results when they are available.  
Part of the data we used to calibrate the Global and Direct came from the University of Oregon’s network of radiation sensors in the Northwest.  I do not know what they have in Diffuse but we found their multiple, co-located sensors to be very useful in our studies of Global and Direct radiation.

- Chuck

_________________
Chuck Khuen
Principal
Weather Analytics Inc.
781-856-5383

From: Yeonsook Heo 
Sent: Friday, August 19, 2011 12:57 PM
To: bldg-sim at lists.onebuilding.org 
Subject: [Bldg-sim] Reliable dataset of diffuse irradiance measured on horizontal and vertical surfaces

Hi all,


We are working on quantifying uncertainty in diffuse irradiance calculated by the Perez model. 
We quantify uncertainty by comparing Perez model outcomes against measured diffuse irradiance on tilted surfaces through a mathematical formulation that can identify where the Perez model falls short for its predictability. 

For this analysis, we need the two measured data from the same period on the same location: 
(1) measured diffuse irradiance on tilted surfaces 
(2) measured diffuse irradiance on horizontal surfaces (used as input for the Perez model)

We have hard time obtaining enough data for analysis. 

Can anyone know where we can access reliable dataset including the two measured data?



Thanks,
Yeonsook


-- 

Ph.D student
High Performance Buildings
College of Architecture
Georgia Institute of Technology




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