Exploration of evaporation mitigation measurement techniques

Maskall, Jonathon (2015) Exploration of evaporation mitigation measurement techniques. [USQ Project]

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Abstract

This dissertation documents signification research conducted into exportation mitigation techniques. In doing so the dissertation firstly explores current mitigation techniques floating, shade and chemical covers. The dissertation highlights suitable methods for monitoring evaporation loss in small water facilities. Using the NCEA Evaporation Compound Facility field trials were conducted. Understanding the behaviour at the air/water, will hopefully lead to improvements in the performance of monolayers through the identification of optimum application periods.

The field research conducted compares the evaporative performance of an artificially imposed warm and cold surface film. Using black plastic covers to impose a warm surface film and a bilge pump to mix water and impose a cold surface film. A series of thermocouple probes are used to analysis the air/water interface and monitoring the presents of warm and cold surface film within two tanks. Through field trials an understanding of the natural resistance to evaporation loss imposed by a thermally stable warm surface film is explored. It is predicted that the resistance of a thermally stable warm surface film may exceed the resistance imposed by an artificial monolayer.

The dissertation finds that a warm surface film consistently recorded higher rate of evaporative loss. However significant turnover events are experienced within the tank where the artificial warm surface film is imposed. The turnover event causes the resistance imposed by the warm surface film, to be outweighed by a dominate cold surface film. The turnover which occurs daily around 5:00pm implies that the application of a monolayer overnight would significantly reduce rates of evaporation.


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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Civil Engineering with Honours project
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Supervisors: Pittaway, Pamela Foley, Joseph
Date Deposited: 07 Jun 2016 04:37
Last Modified: 07 Jun 2016 04:37
Uncontrolled Keywords: Storage evaporation, Monolayers, Surface film
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090599 Civil Engineering not elsewhere classified
URI: http://eprints.usq.edu.au/id/eprint/29287

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