| Author: | Ng, Kin Wah |
| Title: | Feasibility evaluation of using reverse cycle room air-conditioner for combined space and water heating in residential buildings in Hong Kong |
| Advisors: | Lee, Wai Ling (BSE) |
| Degree: | M.Eng. |
| Year: | 2017 |
| Subject: | Hong Kong Polytechnic University -- Dissertations Air conditioning -- China -- Hong Kong Heat recovery Dwellings -- Heating and ventilation -- China -- Hong Kong |
| Department: | Department of Building Services Engineering |
| Pages: | viii, 50 pages : color illustrations |
| Language: | English |
| Abstract: | In Hong Kong, air-conditioning and domestic water heating are all along two dominant energy end-uses in residential buildings. Heat recovery room air-conditioner is one of the most popular energy saving approach for air-conditioning and domestic water heating. A series of studies in Hong Kong has been carried out to confirm the effectiveness of utilizing the rejected condenser heat from a storage enhanced heat recovery room air-conditioner (SEHRAC) to provide hot water in residential buildings. However, the advantages of SEHRAC can only be taken in summertime when space cooling is required. Therefore, an idea of replacing the ordinary room air-conditioner of SEHRAC by a reverse cycle room air-conditioner (RRAC) has been proposed to achieve year-round operation of SEHRAC and energy reduction in domestic air-conditioning and water heating. As space heating and water heating are two competing tasks. It is possible for RRAC to lose its ability for achieving the space heating objective after it is required to provide an additional function of water heating. However, the difference between peak cooling load and peak heating load in subtropical region like Hong Kong may enable RRAC to satisfy both space and water heating demand. In this study, an hour-by-hour simulations of a typical public housing estate in Hong Kong by using HTB2 and BECRES software package was carried out based on actual building characteristics and energy end-use characteristics identified in pervious studied. Based on the simulation results, detailed energy supply and demand analysis of three representative residential units was carried out under two different designs of RRAC: without a water storage tank and with a water storage tank. It was found that the RRACs can satisfy both the water heating demand as well as the space heating load of the representative residential units only if it is equipped with a water storage tank. This has confirmed the feasibility of using RRAC for combined space and water heating in residential building in Hong Kong. By considering a wider application of using RRAC for combined space and water heating in all residential buildings in Hong Kong, the potential energy saving is about 8.4% of the total energy consumption of the whole residential sector in Hong Kong. This implies that the approach of using RRAC for combined space and water heating is promising and worthy of putting effort in further studies. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 991021959948903411.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 1.36 MB | Adobe PDF | View/Open |
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