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Thermal modelling of borehole heat exchangers and borehole thermal energy stores; Zur thermischen Modellierung von Erdwaermesonden und Erdsonden-Waermespeichern

Abstract

The thermal use of the underground for heating and cooling applications can be done with borehole heat exchangers. This work deals with the further development of the modelling of thermal transport processes inside and outside the borehole as well as with the application of the further developed models. The combination of high accuracy and short computation time is achieved by the development of three-dimensional thermal resistance and capacity models for borehole heat exchangers. Short transient transport processes can be calculated by the developed model with a considerable higher dynamic and accuracy than with known models from literature. The model is used to evaluate measurement data of a thermal response test by parameter estimation technique with a transient three-dimensional model for the first time. Clear advantages like shortening of the test duration are shown. The developed borehole heat exchanger model is combined with a three-dimensional description of the underground in the Finite-Element-Program FEFLOW. The influence of moving groundwater on borehole heat exchangers and borehole thermal energy stores is then quantified.
Authors:
Publication Date:
Jul 15, 2011
Product Type:
Thesis/Dissertation
Report Number:
ETDE-DE-2798
Resource Relation:
Other Information: TH: Diss. (Dr.-Ing.)
Subject:
15 GEOTHERMAL ENERGY; 42 ENGINEERING; MATHEMATICAL MODELS; HEAT EXCHANGERS; FINITE ELEMENT METHOD; BOREHOLES; HEAT TRANSFER; COMPUTERIZED SIMULATION; HEATING LOAD; COOLING LOAD; GEOTHERMAL ENERGY; GEOTHERMAL SYSTEMS
OSTI ID:
22031221
Research Organizations:
Stuttgart Univ. (Germany). Fakultaet Energie-, Verfahrens- und Biotechnik
Country of Origin:
Germany
Language:
German
Other Identifying Numbers:
TRN: DE13G1021
Availability:
Commercial reproduction prohibited. Available from ETDE as OSTI ID: 22031221;
Submitting Site:
DE
Size:
136 page(s)
Announcement Date:
Jan 31, 2013

Citation Formats

Bauer, Dan. Thermal modelling of borehole heat exchangers and borehole thermal energy stores; Zur thermischen Modellierung von Erdwaermesonden und Erdsonden-Waermespeichern. Germany: N. p., 2011. Web.
Bauer, Dan. Thermal modelling of borehole heat exchangers and borehole thermal energy stores; Zur thermischen Modellierung von Erdwaermesonden und Erdsonden-Waermespeichern. Germany.
Bauer, Dan. 2011. "Thermal modelling of borehole heat exchangers and borehole thermal energy stores; Zur thermischen Modellierung von Erdwaermesonden und Erdsonden-Waermespeichern." Germany.
@misc{etde_22031221,
title = {Thermal modelling of borehole heat exchangers and borehole thermal energy stores; Zur thermischen Modellierung von Erdwaermesonden und Erdsonden-Waermespeichern}
author = {Bauer, Dan}
abstractNote = {The thermal use of the underground for heating and cooling applications can be done with borehole heat exchangers. This work deals with the further development of the modelling of thermal transport processes inside and outside the borehole as well as with the application of the further developed models. The combination of high accuracy and short computation time is achieved by the development of three-dimensional thermal resistance and capacity models for borehole heat exchangers. Short transient transport processes can be calculated by the developed model with a considerable higher dynamic and accuracy than with known models from literature. The model is used to evaluate measurement data of a thermal response test by parameter estimation technique with a transient three-dimensional model for the first time. Clear advantages like shortening of the test duration are shown. The developed borehole heat exchanger model is combined with a three-dimensional description of the underground in the Finite-Element-Program FEFLOW. The influence of moving groundwater on borehole heat exchangers and borehole thermal energy stores is then quantified.}
place = {Germany}
year = {2011}
month = {Jul}
}