| Author: | Kang, Houmin |
| Title: | Energy analysis of innovative dedicated outdoor air system with liquid desiccant |
| Degree: | M.Eng. |
| Year: | 2010 |
| Subject: | Hong Kong Polytechnic University -- Dissertations Air conditioning -- Design and construction. Air conditioning -- Energy consumption |
| Department: | Department of Building Services Engineering |
| Pages: | vii, 64 leaves : ill. ; 31 cm. |
| Language: | English |
| Abstract: | The dedicated outdoor air system (DOAS) can handle the sensible load and latent load of supply air independently. Therefore, the problem of over-cooling in conventional air conditioning system can be prevented and the COP of chiller can be improved. In a typical dedicated outdoor air system (typical DOAS) with desiccant wheel, the latent cooling potential of exhaust air is converted to sensible load by direct evaporative cooler and recovered by sensible heat exchanger. However, it would be beneficial to recover the latent cooling potential of exhaust air directly because it is more energy consuming to generate the same amount of latent cooling potential than sensible cooling potential. In this dissertation, the newly proposed system (new DOAS) is developed based on a typical DOAS. The evaporative cooler is replaced by the desiccant wheel to recover total enthalpy of the exhaust air. The desiccant is regenerated by the heat pump which recovers the condenser heat rather than by the heat generated by the boiler. To evaluate the system power consumption and energy savings potential, a typical DOAS and the new system are considered for a building in Hong Kong. Through hour by hour simulations, the energy consumptions of the two systems are calculated and analyzed. The results show that the power consumption of heat device in the new system is half that of the heat device in typical DOAS. The results also indicate that the new system could save up to 38% of primary energy consumption. which sum of energy consumption on chiller and heat device for regeneration desiccant, in comparison with the typical DOAS. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b23563746.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 3.59 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/200/5810