AW: [TRNSYS-users] Vacuum tubes with concentrator

["Timo Sengewald" <timo.sengewald@bls-energieplan.de>]

Xavi,

I didn't have any experience with vacuum tubes and concentrators. But I have
modelled simple VTCs using type 71. If type 71 is applicable for your type
of collector I would suggest reading the very detailed message Michaël
Kummert posted on this topic some time ago:
http://sel.me.wisc.edu/trnsys/mailinglist/archive2003/msg00021.html

But probably you need to use type 74.

Very good test results for many collectors (including the incidence angle
modifiers you need) are available at
www.solarenergy.ch

Best regards

Timo



________________________________________________
Timo Sengewald

BLS Energieplan GmbH
Elsenstraße 106
D-12435 Berlin
Tel.: +49 30 53 32 81-0
Fax: +49 30 53 32 81-40


www.bls-energieplan.de



-----Ursprüngliche Nachricht-----
Von: trnsys-users-bounces@engr.wisc.edu
[mailto:trnsys-users-bounces@engr.wisc.edu] Im Auftrag von Xavier Arino
Gesendet: Donnerstag, 8. Dezember 2005 12:23
An: trnsys-users@engr.wisc.edu
Betreff: [TRNSYS-users] Vacuum tubes with concentrator


Dear TRNSYS group,
I am trying to model a solar hot water system using vacuum tubes with
concentrator (I am using Schott vacuum tubes). I only have the instant
efficiency test (quadratic equation) from the manufacturer. I am not sure if
I should use TYPE 74 (CPC collector) or TYPE 71 (Vacuum Tube), because I
don?t know if Type 71 ?or the instant efficiency equation- will take account
of the ?concentration effect? into the absorber. Does anyone have any
recommendations on what to do? Many thanks
 
Xavi Ariño