Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor | Department of Building Services Engineering | en_US |
dc.contributor.advisor | Deng, Shiming (BSE) | - |
dc.creator | Li, Xuejing | - |
dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/10380 | - |
dc.language | English | en_US |
dc.publisher | Hong Kong Polytechnic University | - |
dc.rights | All rights reserved | en_US |
dc.title | Development of an adaptive fuzzy controller for simultaneous indoor air temperature and humidity control using a direct expansion (DX) air conditioning (A/C) system | en_US |
dcterms.abstract | In buildings, to control indoor air humidity at a suitable level is as important as to control indoor air temperature since indoor humidity directly affect people's thermal comfort. Most of previous studies only focused on temperature and thought less about humidity. For example, in hot and humid area like Hong Kong, the time of using A/C system is near seven months every year from March to October. Not only the requirement of removing heat load is high, but also the requirement of removing moisture load is high. Recently, direct expansion air conditioning systems are widely used all over the world since its well control performance, the characteristic of energy-efficient and cost-efficient and the simpler structure. While the performance of controlling humidity was not as well as desired, and then variable-speed direct expansion air conditioning systems were developed which aimed to achieve simultaneous control of indoor air temperature and humidity. It varies the speed of compressor and supply fan which were installed in the air conditioner, and generally, compressor was used to control indoor humidity and supply fan was applied to control the temperature. Furthermore, adaptive fuzzy controller was added to this kind of A/C system which only needed previous studies' and people's experience, while did not need an accurate and complicated mathematical model. The fuzzy control method made simultaneous control of indoor air temperature and humidity became easier. Firstly, this project introduced the basic information of DX A/C system, VS DX A/C system and the requirement of controlling indoor humidity. Secondly, this project did an review of previous controllers of controlling indoor air temperature or both indoor air temperature and humidity. Next, this project introduced fuzzy control and added adaptive fuzzy control to A/C system, and controllability test was carried out to test the controller's performance. | en_US |
dcterms.extent | xv, 87 pages : color illustrations | en_US |
dcterms.isPartOf | PolyU Electronic Theses | en_US |
dcterms.issued | 2019 | en_US |
dcterms.educationalLevel | M.Eng. | en_US |
dcterms.educationalLevel | All Master | en_US |
dcterms.LCSH | Hong Kong Polytechnic University -- Dissertations | en_US |
dcterms.LCSH | Air conditioning -- Control | en_US |
dcterms.LCSH | Humidity -- Control | en_US |
dcterms.accessRights | restricted access | en_US |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
991022370852503411.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 3.8 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/200/10380