energy saving in hospitals: hong kong initiatives p l yuen 14 may 2011
TRANSCRIPT
Energy Saving in Energy Saving in Hospitals:Hospitals:
Hong Kong InitiativesHong Kong Initiatives
P L Yuen
14 May 2011
Content
(A) Background
(B) Energy Saving Strategy
(C) Energy Saving Achievements
(D) Sustaining Energy Saving
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(A) Background(A) Background
Purposes of Energy Saving
Protect environment
Cut down energy use and save money
Minimize health threats with less harmful emission
Project positive corporate image
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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
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Hospital Energy Consumption Level
Source UsageAnnual Energy Expenditure*
ElectricityAir Conditioning, Lighting & Power
$692M (83%)
Town Gas and Liquified Petroleum Gas
Hot Water & Steam $108M (13%)
Diesel FuelHot Water, Steam & Emergency Power
$37M (4%)
Total $837M (100%)
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* 2009/10 figures
Hospital Electricity Consumption Distribution
55%15%
15%
15%
Air-conditioning and Ventilation
Lighting
Equipment
Miscellaneous
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(B) Energy Saving Strategy(B) Energy Saving Strategy
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
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Energy Demand Side Management
Hospital Building Envelope
Hospital Engineering Systems
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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
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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
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Summary of Implemented Measures
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Air-conditioning (A/C)
Lighting & Electrical
MiscellaneousBoiler & Hot Water
Energy Demand Side Management - Hospital Engineering Systems
Summary of Implemented Measures
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Air-conditioning
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
Energy Demand Side Management - Hospital Engineering Systems
Summary of Implemented Measures
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Lighting & Electrical
LED exit sign
T5 lighting retrofit
Sensor lighting control
Compact fluorescent lamp
Energy Demand Side Management - Hospital Engineering System
Summary of Implemented Measures
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Boiler & Hot Water
De-scaling device for boiler
Heat pump application
Energy Demand Side Management - Hospital Engineering System
Summary of Implemented Measures
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Miscellaneous
Lift modernization
Housekeeping & operational measures
Energy management control & monitoring software
Energy Demand Side Management - Hospital Engineering System
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
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Proposed Further Measure
Energy Demand Side Management - Hospital Engineering System
Energy Supply Side Management
Alternative Choice of Energy
Adopting renewable energy
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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
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Proposed Further Measures
Energy Supply Side Management - Alternative Choice of Energy
Trigeneration Installation
Proposed Further Measures
Energy Supply Side Management - Alternative Choice of Energy
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
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Proposed Further Measures
Energy Supply Side Management - Alternative Choice of Energy
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
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(C) Energy Saving Achievements(C) Energy Saving Achievements
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)
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(D) Sustaining Energy Saving(D) Sustaining Energy Saving
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
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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
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Thank You