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borehole-geophysics
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A simplified analytical model for predicting the heating performance of single U-tube underground heat exchangers
, Article Scientia Iranica ; Volume 28, Issue 2 B , 2021 , Pages 847-859 ; 10263098 (ISSN) ; Saidi, M. H ; Naja, M ; Aghanaja, C ; Sharif University of Technology
Sharif University of Technology
2021
Abstract
To ensure an optimized borehole in terms of heat capacity and cost-effectiveness, it is necessary to predict the heating performance of underground U-tube heat exchangers (boreholes) so that proper parameters such as length, diameter, material, etc. can be designed and selected. To this end, employing reliable equations is essential to predicting the heating performance of a borehole and also, to resolving the design issues. In this study, a single vertical U-tube borehole with a constant wall temperature is considered and analytical equations for temperature distribution in the surrounding ground around the borehole are evaluated based on one- and two-dimensional heat conduction,...
A techno-economic analysis of geothermal ejector cooling system
, Article Energy ; Volume 193 , 15 February , 2020 ; Aligolzadeh, F ; Hakkaki Fard, A ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
Ground-coupled ejector cooling (GCEC) systems have been introduced to solve the air-coupled ejector cooling (ACEC) systems problems. To date, no research study is dedicated to compare the GCEC and the ACEC systems and determine the relative payback period of the GCEC system vs. the ACEC system. Furthermore, almost all the previous studies simulated the GCEC systems by elementary models. Therefore, a comprehensive simulation is conducted to assess the techno-economic performance of a GCEC system. The model consists of the ejector and the borehole heat exchanger submodels. The first section of the results compares the ACEC system and the GCEC system during a cooling season. The seasonal...