Energy Saving in Hospitals: Hong Kong Initiatives

1. Energy Saving in Hospitals:Hong Kong Initiatives P L Yuen 14 May 2011

2. Content (A) Background (B) Energy Saving Strategy (C) Energy Saving Achievements (D) Sustaining Energy Saving

3. (A) Background

4. Purposes of Energy Saving • Protect environment • Cut down energy use and save money • Minimize health threats with less harmful emission • Project positive corporate image

5. Energy use from Hospital Building operation • Use of energy for: • air conditioning and ventilation • lighting and electrical power • Steam and hot water • Energy source included: • Electricity • Town Gas and Liquified Petroleum Gas (LPG) • Diesel fuel

6. Hospital Energy Consumption Level * 2009/10 figures

7. Hospital Electricity Consumption Distribution

8. (B) Energy Saving Strategy

9. Energy Saving Strategy • Energy Demand Side Management • Actions taken to influence the quantity and pattern of use of energy in hospitals • Energy Supply Side Management • Selection of energy source and switch fuels

10. Energy Demand Side Management • Hospital Building Envelope • Hospital Engineering Systems

11. Energy Demand Side Management - Hospital Building Envelope • Overall Thermal Transfer Value (OTTV) Control - reduce overall building solar heat gain (e.g. Low shading coefficient glass, sunshades, recessed windows, etc.) • Planting & Roof Garden - reduce roof solar heat gain and create better patient healing environment

12. Energy Demand Side Management - Hospital Engineering Systems • Promote good house keeping practice  • Retrofit existing engineering system / equipment for energy efficiency • Establish energy efficiency design reference standard for new hospital projects 

13. Summary of Implemented Measures Energy Demand Side Management - Hospital Engineering Systems Lighting & Electrical Air-conditioning (A/C) Boiler & Hot Water Miscellaneous

14. Air-conditioning Summary of Implemented Measures Energy Demand Side Management - Hospital Engineering Systems • Improvement of A/C control system • Automatic tube cleansing system for chiller • Polarized refrigerant oil additive for chiller • Chiller plant interconnection • Variable speed drive for chiller • Replacement of high efficiency chiller • Use of water-cooled A/C system  • Window reflective film

15. Summary of Implemented Measures Energy Demand Side Management - Hospital Engineering System • LED exit sign • T5 lighting retrofit  • Sensor lighting control • Compact fluorescent lamp Lighting & Electrical

16. Summary of Implemented Measures Energy Demand Side Management - Hospital Engineering System • De-scaling device for boiler • Heat pump application  Boiler & Hot Water

17. Summary of Implemented Measures Energy Demand Side Management - Hospital Engineering System • Lift modernization • Housekeeping & operational measures • Energy management control & monitoring software  Miscellaneous

18. Energy Demand Side Management - Hospital Engineering System Proposed Further Measure Replace air-cooled chillers by water-cooled chillers • Identified suitable replacement of 22 air-cooled chillers in 8 venues within 5 years • Estimated $15M annual energy cost saving • Subject to business case and risk assessment

19. Energy Supply Side Management • Alternative Choice of Energy • Adopting renewable energy

20. Energy Supply Side Management - Alternative Choice of Energy • Key considerations included: • Safety & Reliability • Environmental • Tariff • Switching from Diesel fuel to Town gas - 9 hospitals already switched to towngas with offered rebate for dual fuel boilers

21. Energy Supply Side Management - Alternative Choice of Energy Proposed Further Measures Trigeneration Installation

22. Energy Supply Side Management - Alternative Choice of Energy Proposed Further Measures

23. Energy Supply Side Management - Alternative Choice of Energy Proposed Further Measures Trigeneration installation • High overall system efficiency in generating own electricity • Residual heat for providing steam, hot water and air conditioning • More viable with availability of use of landfill gas at lower tariff • Require consultancy study review on trigeneration business case

24. Energy Supply Side Management - Adopting renewable energy • Increase solar hot water system installation in hospitals • Ride on new Government directives to install more renewable energy system in new hospital projects

25. (C) Energy Saving Achievements

26. Energy Saving Achieved • Energy index in terms of mega joule per hospital floor area (MJ/m2) at downward trend • 3.1% reduction in 5 year intervals from 2004/05 up to 2009/10 (equivalent to $70M cumulative savings)

27. (D) Sustaining Energy Saving

28. Sustaining Energy Saving • Support ongoing Government initiation to reduce energy use and carbon emission • Key initiatives include: • Energy Demand Supply Management • To consider replacing air cooled chiller to water cooled chiller • Energy Supply Side Management • To work out business case of using Trigeneration System 28

29. Sustaining Energy Saving • Continue to ensure hospitals are built with various energy efficient features by the works agents/consultants • Participate in territory-wide carbon-less certification scheme as encouragement and continual driving momentum • Anticipated there would be further energy reduction 29

30. Thank You