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Second-order Multipole Formulas for Thermal Resistance of Single U-tube Borehole Heat Exchangers

Saqib Javed (Institutionen för bygg- och miljöteknik, Installationsteknik ) ; Johan Claesson (Institutionen för bygg- och miljöteknik, Byggnadsteknologi)
Proceedings of the IGSHPA Technical/Research Conference and Expo 2017, March 14-16, Denver (2017)
[Konferensbidrag, refereegranskat]

The borehole thermal resistance is both an important design parameter and a key performance characteristic of a borehole heat exchanger. Another quantity that is particularly important for deep borehole heat exchangers is the internal thermal resistance between the upward-flowing and downward-flowing fluid channels in the borehole. The multipole method is a well-known and robust method to compute both these thermal resistances. However, it has a fairly intricate mathematical algorithm and is thus not trivial to implement. Consequently, there is considerable interest in developing explicit multipole formulas. So far zeroth-order and first-order multipole formulas have been derived for cases where the two legs of the borehole are placed symmetrically in a borehole. This paper presents new explicit second-order multipole formulas, which provide significant accuracy improvements over the previous formulas.

Nyckelord: Borehole thermal resistance, Multipole method, Ground heat exchanger, Internal thermal resistance, Second-order multipole formulas



Denna post skapades 2017-03-10. Senast ändrad 2017-03-16.
CPL Pubid: 248516

 

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Institutioner (Chalmers)

Institutionen för bygg- och miljöteknik, Installationsteknik (2015-2017)
Institutionen för bygg- och miljöteknik, Byggnadsteknologi (2005-2017)

Ämnesområden

Geoteknik
Termisk energiteknik
Energisystem

Chalmers infrastruktur