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8 Energy Management and Audit.pdf - SEE 3103 Energy...

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1SEE 3103Energy Efficiency for Buildings8. Energy Management and Energy AuditProf. Michael K.H. LeungSchool of Energy and EnvironmentCity University of Hong Kong
ISO/FDIS 50001:2011(E)Energy management systemsRequirements with guidance for use2
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2007 Version7
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10Energy auditAn energy audit includes a sequence of activities to review the energyconsumption of a building or a plant, assess its energy performance andidentify energy conservation opportunities (ECOs). The key objectives ofenergy audit are to improve the energy efficiency, save energy and savecost. An energy audit may also lead to an increase in environmentalperformance of the building as energy conservation can reduce theemission of carbon dioxide from the power plant.ECO is also called energy management opportunity (EMO) and energyconservation measure (ECM)
11Levels of energy audit1.Walk-through audit2.Utility cost analysis3.Standard energy audit4.Detailed energy audit
121. Walk-through auditUnderstand the concerns and needs of facility owner.Collect information on building (e.g. occupancy,equipment, operating hours, construction materials,etc.)Check the current operation and maintenance (O&M)energy saving opportunities (e.g. temperature setpoints, lighting on/off, closing windows, etc.).
132. Utility cost analysisCollect utility bills from previous years (electricity, fuelgas, oil, etc.)Identify energy consumption profile and peak demand.Evaluate the energy indicators, i.e. MJ/m2/year orMJ/occupant/year.Compare indicators with benchmarks as a preliminarystudy of energy performance.
14Energy indicatorsCompare with buildings of the same type to evaluate thepotential for savings.Monitor your building’s year-to-year energy indicator toevaluate progress in conserving energy; may require acorrection using some methods such as comparingdegree days or bin data.Predicting the energy use for a new building of the sametype.
15Comparison with benchmarkse.g. Annual energy use versus gross floor area0102030405060708090010203040506070Gross Floor Area (x 1,000 m2)Annual Energy Use (x 1,000 GJ)Hotels in Hong KongSlope gives thebenchmark(GJ per m2)Many energy savingopportunities expectedThis hotelperforms wellRef. Asia-Pacific Economic Cooperation (APEC) Energy Working Group
16Energy indicators of offices in Hong KongRef.:HKSAR/EMSD, Energy Consumption Indicators for Offices
17More energy consumption indicators and benchmarks for Hong Kongare at the following HKSAR/EMSD Website:OfficesCommercial OutletsHotels and Boarding HousesUniversities, Post-secondary Colleges and SchoolsHospitals and ClinicsPrivate CarsLight Good VehiclesMedium Goods VehiclesHeavy Goods VehiclesPrivate Light BusesNon-Franchised Buses
183. Standard energy audit

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Term
Summer
Professor
NoProfessor
Tags
Greenhouse gas, Kyoto Protocol,

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