Title:

Thermal Response Testing of Geothermal Wells for Downhole Heat Exchanger Applications

Authors:

Andrew CHIASSON

Key Words:

dowhhole heat exchanger, inverse modeling

Conference:

Stanford Geothermal Workshop

Year:

2012

Session:

Direct Use

Language:

English

Paper Number:

Chiasson

File Size:

1144 K

View File:

Abstract:

Accurate prediction of transient subsurface heat transfer is important in sizing downhole heat exchangers (DHEs) and making predictions of their thermal output, but quantification of these processes has been difficult and elusive in practice. As such, current DHE design methods rely on empirical data and rules of thumb. The work described in this paper makes use of so-called in-situ thermal response testing, in conjunction with a newly-adapted analytical solution that describes the coupled conductive and advective heat transport relevant to DHEs. The complex heat transfers within the well bore are described by a lumped thermal resistance parameter. A parameter estimation technique is applied to thermal response test data at a site in southern Oregon to quantify the average rock thermal conductivity, apparent average linear groundwater velocity, and wellbore thermal resistance. An example is given on use of the method to make DHE temperature output predictions over time of operation for an actual heating application.


ec2-3-236-252-14.compute-1.amazonaws.com, you have accessed 0 records today.

Press the Back button in your browser, or search again.

Copyright 2012, Stanford Geothermal Program: Readers who download papers from this site should honor the copyright of the original authors and may not copy or distribute the work further without the permission of the original publisher.


Attend the nwxt Stanford Geothermal Workshop, click here for details.

Accessed by: ec2-3-236-252-14.compute-1.amazonaws.com (3.236.252.14)
Accessed: Friday 29th of March 2024 05:51:41 AM