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Re: [EnergyPlus_Support] small (5kW) wind turbines in E+ v5



Have you adjusted your turbine height, and wind speed at site?

I would not trust manufactures claims, as most turbines under-perform in reality..

I have modeled VAWT's as well as installed them, and noticed that E+ is about as accurate as it gets... 

You could put up an anemometer to get more accurate wind speed at site data, and attached is a working file I created some time ago..




Jeremiah D. Crossett
CleanTech Analytics
503-688-8951
www.cleantechanalytics.com


This document may contain valuable information proprietary to CleanTech Analytics which is private and confidential. It may not be shared, copied, stored or transmitted in any form without the prior written consent of CleanTech Analytics




On Tue, Apr 17, 2012 at 2:45 PM, chris_malc_yates <chris_malc_yates@xxxxxxxxxxx> wrote:
 

Hi

I've attempted to model an Evance r9000 turbine (5kWp, similar to a Bergey) in E+ by taking the "GeneratorWithWindTurbine.idf" example file and editing/ deleting to model the Evance more closely.

The problem is that I'm coming in with much lower yield figures than Evance quote. Evance quote yeild on the basis of Average Annual Wind Velocity.

I'm aware that there appears to be some statistical differences between the Average Annual figure and typical hourly weather data. E+ appears to deal with this by using a Average Annual as a reference wind speed. I guess this kind of "normalises" the weather data somehow (you've probably guessed by now I'm no statistician!).

Given that I've already input a reference figure for average annual, and had various things confirmed by Evance (tip speed ratio, reference wind velocity, cut in speed, diameter, furl mechanism) and am struggling to recreate their yield, are there any tips or tricks that anybody could recommend for me. For example, should I play with the power constants (C1 - C6)? If so, what power constants would be appropriate for a turbine of this size?

Many thanks in advance.

Chris Yates




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Attachment not found:
d:\eudora\attach\Windspire_PCC_MONTHLY_ETO.idf