[esp-r] Re: simulating VDI 6020

[Achim Geissler]

Dear Adhi

 

1)      Yes, the startup days – 1 day is too short for most models. Use at least 7 days, heavy constructions can easily require 21 days

2)      Example 1 seems to be a steady state case. You will need to create your own meteo file with a constant temperature of 22 °C, no solar. The change in temperature then results from the “Machines” with 1000 W that run from 6 to 18:00. However “no long wave radiation” is difficult. Probably you would need to set external surface emissivity to 0. Or maybe sky and ground fractions to 0.

 

Achim

 

 

 

From: AdhiSüß [mailto:adhi_vanjava at yahoo.ca] 
Sent: Donnerstag, 10. Dezember 2009 19:08
To: Achim Geissler
Subject: Re: [esp-r] simulating VDI 6020

 

Dear Achim,
1. Do you mean the "start-up days" ? If yes, it's 1 day
2. I don't know it is a jump response or not but I am attaching page 51 & 52 of VDI 6020 test for your opini.  It could be, the test is using contanst temperature (22C), or is this the initial temperature?
Thanks for your help

Adhi

 

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From: Achim Geissler <achim.geissler at intergga.ch>
To: AdhiSüß <adhi_vanjava at yahoo.ca>; ESP-r <esp-r at lists.strath.ac.uk>
Sent: Thu, December 10, 2009 4:44:12 PM
Subject: RE: [esp-r] simulating VDI 6020

Dear Adhi

 

allthough I do not know what the Example 1 in VDI 6020 covers, the results you sent give rise to following questions for me:

1)      How long was your “warm up” for ESP-r?

2)      Is Example 1 not a “jump response” type of test? The 6020 plot seems to imply this

 

In any case, an old “Bine” information (III/99) covers VDI 6020 in its development stage and also compares ESP-r results (among others). Here, “Example 1” shows good agreement.

 

Achim

 

 

From: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-bounces at lists.strath.ac.uk] On Behalf Of AdhiSüß
Sent: Donnerstag, 10. Dezember 2009 16:03
To: ESP-r
Subject: [esp-r] simulating VDI 6020

 

Hello,
I did simulation VDI 6020 (Example 1) with ESP-r. It is not clear what weather data is used in that test. My friend said, it is TRY for Wuerzburg (weather region 5). I built the model and used this weather data, but the results are different. Same trend but not close (see VDI6020.jpg). My question is: is that the correct weather data for VDI 6020 test? if yes, why is so much different between VDI's results and ESP-r's results? I have checked construction and schedule of my model are according to VDI 6020 (Example 1). Thank you for your help.

regards
Adhi

 

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