Re ECF Project: 2011-40

Project Title: Study the energy saving opportunities and potentials of using wireless sensor network to monitor the indoor climate of large-scale rooms in Hong Kong

Applicant: Dr. Gongsheng HUANG of City University of Hong Kong

Total Approved Grant: $442,000.00

Duration: 1/10/2012 to 31/3/2014

Project Status/Remarks: Completed

This project aims to build a first Wireless Sensor Network (WSN) test bed in Hong Kong to improve the indoor climate monitoring performance for large scale rooms. It will also develop a systematic and analytic approach to explore the energy-saving opportunities and potentials offered by the WSN-based monitoring system.

Summary of the Findings/Outcomes:
A wireless sensor network has been established in a large space in City University of Hong Kong and data have collected for 6 months. The findings in Phase 1 and Phase 2 were summarized in the first report, and the findings in Phase 3 were summarized in the second report. Here, the main findings/ outcomes in Phase 4 and 5 are summarized. All the algorithms used to real-time monitor the indoor environment have been finalized, including data process and real-time visualization of temperature distribution. History data analysis has revealed the temperature distribution characteristics: the distribution is uneven and some areas have a high temperature and some areas have a low temperature. Overall is slightly over-cooled. A CFD model was constructed to analyse the energy saving potential. It has been found that if the room temperature can be raised to 25°C, supply air flow rate can be reduced by 20% and the energy saving can be up to 5-10%. Temperature homogeneity can be improved by re-allocating the supply air flow rate of the air terminals.