Great artesian basin (GAB) water cooling systems for municipal supplies

Guse, Hayden Alexander (2014) Great artesian basin (GAB) water cooling systems for municipal supplies. [USQ Project]

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Abstract

Legislative specifications require water supply authorities in Queensland to deliver water at temperatures not exceeding 45 °C. Bores extracting water from the Great Artesian Basin can have water temperatures up to 100 °C. Hence municipal water suppliers that make use of hot artesian water are required to cool this water. To achieve this, a variety of cooling methods have been implemented throughout Queensland. The majority of the current cooling methods have proven to be quite wasteful of this valuable resource, while the systems themselves have proven to be quite costly.
The aim of this research was to investigate the existing cooling systems, determine whether Ground Heat Sink Pipe Loops (GHSPL) are a viable alternate cooling method and make recommendations for future cooling system designs. Ground Heat Sink Pipe Loops are pipes buried at shallow depths that utilise the naturally cool soil as a heat sink to dissipate the excess heat from the artesian water.
To determine the effectiveness of this alternate cooling method, a number of simple one-dimensional heat transfer models were written in MATLAB. Research found that an important design parameter for underground heat dissipation is soil thermal conductivity. With this in mind a number of experiments were conducted on an artesian water bore between Goondiwindi and St George, with the aim being to collect data so that the models could be iteratively used to determine the soil thermal conductivity. The models, along with an increased understanding of soil temperature relationships gained from experimentation were then used to produce a concept design.
This GHSPL design was completed for the township of Thargomindah, and found that with 200 mm nominal diameter polyethylene pipe and an integrated storage reservoir, there would be approximately 6.83 km of pipe buried at 450 mm depth to achieve the required cooling. This outcome is considered feasible based on system cost, and an improvement on current cooling methods, based on decreased water wastage. Further research into GHSPL cooling is required to better understand the complexities of system design prior to this technology being implemented.


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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Engineering (Civil) project.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Supervisors: Foley, Joseph
Date Deposited: 09 Sep 2015 04:51
Last Modified: 03 Mar 2016 04:54
Uncontrolled Keywords: Great Artesian Basin, municipal water supply, water cooling, GAB, engineering, ground heat sink pipe loops, GHSPL, artesian water, Goondiwindi, St George, Queensland, Thargomindah
Fields of Research : 05 Environmental Sciences > 0599 Other Environmental Sciences > 059999 Environmental Sciences not elsewhere classified
09 Engineering > 0907 Environmental Engineering > 090701 Environmental Engineering Design
09 Engineering > 0905 Civil Engineering > 090509 Water Resources Engineering
URI: http://eprints.usq.edu.au/id/eprint/27283

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