Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Department of Electrical and Electronic Engineering | en_US |
| dc.contributor.advisor | Cheng, Eric (EEE) | en_US |
| dc.creator | Leung, Yiu Kuen | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/13628 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | en_US |
| dc.rights | All rights reserved | en_US |
| dc.title | Unveiling the benefits of condensed water reclaimed for evaporative cooling tower in water conservation and energy saving | en_US |
| dcterms.abstract | Although the water bodies have emphasized on using greywater to alleviate water consumption, the progress of condensed water implementation for high-rise building is still sluggish. The categorization of condensed water as greywater, which is highly contaminated, requires extensive treatment in water treatment plant prior to any applications and then poses a challenge to its widespread reclamation. The novelty of this study is to demonstrate the direct use of condensed water in an existing cooling water system, without the need of waste water treatment. In addition, considering there is barley any practical case study to unveil the water-energy nexus in reclaiming condensed water for evaporative cooling tower systems, this research aims to extricate the intricate relationships and fill the gap of reclaiming condensed water that not only conserves water resources but also enhances energy savings and is cost-effective. Given that the condensed water possesses an intrinsic mineral-free property, the water saving potential is amplified to the most tolerable total dissolved solids (TDS) of system water. Furthermore, it is beneficial to water quality control ameliorated the operating working conditions, the system performances were improved and then less power was consumed. By eliminating the need for wastewater treatment, consolidating the practicality of direct-use application, and showcasing its sustainability for water and energy saving, this research may revive the attention of green building initiatives and accelerate its implementation. The condensed water, a by-product of air-conditioning, was reclaimed as supplementary make-up cooling water without extra power consumption that is ideal for concentration dilution, and beneficial to descaling. An evaporative cooling system consumes tons of water and the water losses are necessarily compensated by fresh water, this process occurs gradually over time and progressively escalates the TDS with time which evocates water scale formations. Although the bleed-off that discharges the mineral-laden system water effectively lowers the TDS, it is not a water conservative measure and the chemical effluent poses environmental hazards. Increasing the cycles of concentration (CoC) of the system water can reduce the frequency of bleed-off and sustain the full efficacy of anti-scaling chemicals. Whenever water scales, a kind of heat barrier, deposit on the heat exchanger surfaces, the heat transfer is diminished, and energy efficiency drops. The water and energy saving enhancement method was accomplished by reclaiming the condensed water and setting higher CoC. | en_US |
| dcterms.extent | xxxi, 333 pages : color illustrations | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 2024 | en_US |
| dcterms.educationalLevel | Eng.D. | en_US |
| dcterms.educationalLevel | All Doctorate | en_US |
| dcterms.accessRights | restricted access | en_US |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 8114.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 65.2 MB | Adobe PDF | View/Open |
Copyright Undertaking
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item:
https://theses.lib.polyu.edu.hk/handle/200/13628