[TRNSYS-users] Questions on the Vertical U-Tube Ground Heat Exchanger

[Lei Wang]

Hi, François

Thanks for your response.

Could you tell me the meaning of the PAR(11), which is negative of U-tubes/bore.

Thank you very much

Lei Wang


From: Francois Badinier [mailto:francois.badinier at icax.co.uk]
Sent: Tuesday, April 21, 2009 10:02 AM
To: Lei Wang
Cc: trnsys-users at cae.wisc.edu
Subject: RE: [TRNSYS-users] Questions on the Vertical U-Tube Ground Heat Exchanger


Hi Lei



This is a good question. But I think these parameters refer the radius as explained in the proforma, because if you see in the code, they are called R0=PAR(5), Rpo=PAR(12), Rpi=PAR(13) which stand logically for Radius... So I just think that there is an error in the DSTWizard.



Otherwise, it is not possible to model a double U tube heat exchanger with this Type557. I can refer you to a component coded by TRANSSOLAR which can do that, it is called Type451. You can find the documentation and order it on http://www.transsolar.com/__software/docs/komponenten/komponenten_ts_en.htm



Regards,


François Badinier
Development Engineer
ICAX Ltd
1 Hatfield House
Baltic Street West
London EC1Y OST
francois.badinier at icax.co.uk<mailto:alan.kiff at icax.co.uk>
www.icax.co.uk<http://www.icax.co.uk>







-----Original Message-----
From: Lei Wang [mailto:leiwang at tees.tamus.edu]
Sent: 17 April 2009 19:47
To: trnsys-users at cae.wisc.edu
Subject: [TRNSYS-users] Questions on the Vertical U-Tube Ground Heat Exchanger



Hi, all



I have questions on the vertical U-tube ground heat exchanger.



In the parameter table, Parameters of 5(Borehole radius), 12(Outer radius of u-tube pipe), 13 (inner radius of u-tube pipe). I think these parameters should be the radius of the Borehole and tube pipe. But in the Plugin program DSTWizard  the diagram show these value are the diameter. Anyone call tell me these values are radius or diameter.



Another question is if this model can simulate the two U-tubes in same borehole. If it can, how to input the parameters for the parameter 17 (Reference borehole flow). This flow is the total flow of the two U-tubes in same borehole or just is the flow of one U-tube



Thanks



Lei Wang



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