| Author: | Niu, Jiajia |
| Title: | A PMV based controller for a direct expansion air conditioning system |
| Advisors: | Deng, Shiming (BSE) |
| Degree: | M.Eng. |
| Year: | 2017 |
| Subject: | Hong Kong Polytechnic University -- Dissertations Buildings -- Thermal properties Air conditioning Ventilation |
| Department: | Department of Building Services Engineering |
| Pages: | 2, iv, 79 pages : color illustrations |
| Language: | English |
| Abstract: | This project investigated the design of an efficient comfort control system, in which the predicted mean vote (PMV) was accepted as the control objective to adjust and improve indoor thermal comfort level by taking six thermal comfort related parameters into account, and among them three variables (air temperature, relative humidity, air velocity) were selected as the research objectives in this study. Accordingly, a comfort index regulator (CIR), which depends on the PMV and takes 0 (neutral) as the default reference input, was used to realize thermal comfort control as well as maintain the high operating efficiency when compared with conventional air temperature regulator (ATR) based controller. Under the precondition that PMV was kept in the range of (-0.5,+0.5) in which indoor air temperature and relative humidity were simultaneously maintained within a relatively comfortable scope, which could guarantee the thermal comfort of indoor occupants at a certain satisfaction degree. To make sure that this control method can ensure the highest thermal comfort level of actual thermal sensation of users, a fuzzy logic based thermal comfort regulator (FLTCR), which combining multivariable control and simultaneous control of air temperature and relative humidity, was utilized in this project. In addition, the electrical energy conservation effect which would brought by the improvement of air velocity was also examined in this project. Good prospects of this application were not only could realize the improvement of indoor thermal comfort but also fulfill the reduction of energy consumption. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 991021980634603411.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 1.12 MB | Adobe PDF | View/Open |
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