Getting Started A Beginner’s Household Energy Audit

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Getting Started A Beginners Household Energy Audit. Jim Lambert. The background idea. Set priorities to minimise our household energy use (greenhouse emissions) Would need multiple actions Needs some kind of analysis to decide where to start. Household Setup. 1950s family home - PowerPoint PPT Presentation

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  • Getting Started

    A Beginners Household Energy AuditJim Lambert

  • The background ideaSet priorities to minimise our household energy use (greenhouse emissions)Would need multiple actionsNeeds some kind of analysis to decide where to start

  • Household Setup1950s family homeRenovated 25 years agoGood northerly aspect & some reasonable passive solar design2 people (newly retired)Electric off peak hot waterGas space heatingNo air conditioning1 car (old and thirsty)

  • Equipment (for collecting data)Normal electricity and gas metersPast records of gas and electric bills

  • Greenhouse gas estimates (past bills)

  • Greenhouse Gas estimates

  • Electrical Energy Usage (kWhrs) (from past bills)

    Chart2

    1190710

    1250660

    1420700

    1210770

    1140710

    1280670

    1290730

    1480820

    1540890

    1340680

    1210750

    1540780

    2050800

    1390690

    1470690

    1390760

    1192707

    1148543

    normal

    off peak

    long term test

    base for graph12:00:00 AM73679093

    daytimemain meter kwhroff pk meter kwhrelapsed timeelapsed daysmain meter usedof peak meter used

    10/17/068:40:00 PM7367909312/31/990.0000

    10/17/069:40:00 PM7368909312/31/990.0010

    10/17/0610:40:00 PM7370909312/31/990.0030

    10/18/064:10:00 AM737290991/1/001.0056

    10/18/068:10:00 AM737391001/1/001.0067

    10/18/069:10:00 AM737391001/1/001.0067

    10/18/0610:10:00 AM737491001/1/001.0077

    10/18/062:10:00 PM737591001/1/001.0087

    10/18/066:20:00 PM737891001/1/001.00117

    10/18/069:00:00 PM738191001/1/001.00147

    10/18/0610:10:00 PM738191001/1/001.00147

    10/18/0611:35:00 PM738291001/1/001.00157

    10/19/061:00:00 AM738391011/2/002.00168

    10/19/065:00:00 AM738591061/2/002.001813

    10/19/068:00:00 AM738691071/2/002.001914

    10/19/063:45:00 PM739291071/2/002.002514

    10/19/065:45:00 PM739491071/2/002.002714

    10/19/066:55:00 PM739591071/2/002.002814

    10/19/0611:35:00 PM740291071/2/002.003514

    10/20/068:45:00 AM740691171/3/003.003924

    10/20/0612:30:00 PM740891171/3/003.004124

    10/22/0610:10:00 AM742891331/5/005.006140

    10/22/0610:35:00 PM743791331/5/005.007040

    10/23/067:30:00 AM743991421/6/006.007249special minimum load test

    10/23/068:30:00 AM743991431/6/006.007250

    10/24/0610:45:00 PM745991481/7/007.009255

    10/25/066:50:00 AM746291541/8/008.009561

    10/25/0612:15:00 PM746391561/8/008.009663special time everybody away from early morning

    11/12/068:00:00 PM769492891/26/0026.00327196

    average consumption

    main meter12.6kWhr/day4591kWhr/year0.524kW

    off peak7.5kWhr/day2752kWhr/year0.314kW

    long term test

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    Main meter

    off peak

    elapsed time

    power kwhr

    power usage

    short term test

    daily variation test

    base for graph12:00:00 AM73679093

    daytimemain meter kwhroff pk meter kwhrelapsed timemain meter usedof peak meter used

    10/17/068:40:00 PM736790938:40:00 PM00

    10/17/069:40:00 PM736890939:40:00 PM10

    10/17/0610:40:00 PM7370909310:40:00 PM30

    10/18/064:10:00 AM737290994:10:00 AM56normal minimum load

    10/18/068:10:00 AM737391008:10:00 AM67

    10/18/069:10:00 AM737391009:10:00 AM67

    10/18/0610:10:00 AM7374910010:10:00 AM77

    10/18/062:10:00 PM737591002:10:00 PM87

    10/18/066:20:00 PM737891006:20:00 PM117

    10/18/069:00:00 PM738191009:00:00 PM147

    10/18/0610:10:00 PM7381910010:10:00 PM147

    10/18/0611:35:00 PM7382910011:35:00 PM157

    10/19/061:00:00 AM738391011:00:00 AM168normal minimum load

    10/19/065:00:00 AM738591065:00:00 AM1813

    10/19/068:00:00 AM738691078:00:00 AM1914

    10/19/063:45:00 PM739291073:45:00 PM2514

    10/19/065:45:00 PM739491075:45:00 PM2714

    10/19/066:55:00 PM739591076:55:00 PM2814

    10/19/0611:35:00 PM7402910711:35:00 PM3514

    10/20/068:45:00 AM740691178:45:00 AM3924normal minimum load

    10/20/0612:30:00 PM7408911712:30:00 PM4124

    10/22/0610:10:00 AM7428913310:10:00 AM6140

    10/22/0610:35:00 PM7437913310:35:00 PM7040

    10/23/067:30:00 AM743991427:30:00 AM7249special minimum load test

    10/23/068:30:00 AM743991438:30:00 AM7250

    10/24/0610:45:00 PM7459914810:45:00 PM9255

    10/25/066:50:00 AM746291546:50:00 AM9561

    10/25/0612:15:00 PM7463915612:15:00 PM9663special time everybody away from early morning

    special min load test at night

    elapsed time7.92hr

    kWhr2

    rate0.253kW

    refrigerator, freezer, clocks, alarm only

    normal night load tests

    elapsed time11.507hr

    kWhr33

    rate0.2610.429kW

    normal appliances on standby

    short term test

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    Main meter

    off peak

    elapsed time

    power kwhr

    overall power usage pattern

    from bills

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    Main meter

    elapsed time

    power kwhr

    special minimum load test at night

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    Main meter

    off peak

    elapsed time

    power kwhr

    power usage

    periodseasonnormaloff peak

    26 aug 02 21 nov 02spring1190710

    21 nov 02 25 feb 03summer1250660

    25 feb 03 29 may 03autumn1420700

    29 may 03 27 aug 03winter1210770

    27 aug 03 21 nov 03spring1140710

    21 nov 03 24 feb 04summer1280670

    24 feb 04 28 may 04autumn1290730

    28 may 04 25 aug 04winter1480820mat minding house

    25 aug 04 26 nov 04spring1540890mat minding house

    26 nov 04 24 feb 05summer1340680

    24 feb 05 27 may 05autumn1210750

    27 may 05 26 aug 05winter1540780

    26 aug 05 23 nov 05spring2050800andrews visit

    23 nov 05 27 feb 06summer1390690

    27 feb 06 29 may 06autumn1470690

    29 may 06 24 aug 06winter1390760

    24 aug 06 24 nov 06spring1192707

    25 nov 06 26 feb 07summer1148543

    average*average*

    per yearper year

    52682862

    per weekper week

    10155

    per dayper day

    14.57.9

    kW0.6030.328

    *excludes periods when matt staying & andrew visiting

    greenhouse kg/year

    greenhouse multiplier1.2364793520

    normal

    off peak

  • Electricity usage(Converting kWhr to its Greenhouse equivalent)Average (excluding abnormal periods) 5268 kWhr/year (603W continuous)greenhouse gas 6,479 kg/year (factor of 1.23 kg/kWhr from Univ of Sydney stinkOmeter on web)

  • Gas usage (MJ) (from past bills)

    Chart1

    5726

    1989

    2938

    8708

    12825

    7517

    2727

    2675

    2525

    7818

    11982

    8666

    2336

    1937

    1949

    12775

    11917

    6983.64

    2215.15

    855.26

    usage MJ

    season

    MJ

    Sheet1

    gas consumption history

    periodseasonperiod daysusage MJ

    10 Oct 03 9 Dec 03spring605726

    9 Dec 03 12 Feb 04summer651989

    12 Feb 04 14 Apr 04late summer632938

    15 Apr 04 11 June 04autumn578708

    11 June 04 12 Aug 04winter6212825

    12 Aug 04 8 Oct 04late winter577517

    8 Oct 04 9 Dec 04spring622727

    9 Dec 04 11 Feb 05summer642675

    11 Feb 05 14 Apr 05late summer622525

    14 Apr 05 15 June 05autumn627818

    15 June 05 15 Aug 05winter6111982

    15 Aug 05 12 Oct 05late winter588666

    12 Oct 05 9 Dec 05spring582336

    9 Dec 05 14 Feb 06summer671937

    14 Feb 06 13 Apr 06late summer581949

    13 Apr 06 16 June 06autumn6712775

    19 June 06 15 Aug 06winter5711917

    15 Aug 06 20 Oct 06late winter676983.64

    20 Oct 06 13 Dec 06spring542215.15

    14 Dec 06 15 Feb 07summer64855.26

    average/yr37998MJ

    peak/day207MJJune-Aug

    Sheet1

    usage MJ

    season

    MJ

    Sheet2

    Sheet3

  • Average 38,000 MJ/yeargives greenhouse gas 2,660 kg/year (factor 0.07 kg/MJ from stinkOmeter))Peak (for heating design) 207MJ/day in winter June-AugustGas usage(Converting MJ to its Greenhouse equivalent)

  • Car greenhouse emissions(Fuel consumed & Distance over 8 weeks)Average distance 286 km/week Average consumption 15.0 litre/100km2.3kg greenhouse per litre of petrol (source Australian Greenhouse Office Fuel Consumption Guide 2002-3)Fuel usage 15.0*286/100 = 42.9 litre/weekthis would give greenhouse gas 2.3 * 42.9 * 52 kg/year = 5,131 kg/yr

  • Ideas from first passSpare refrigerator gone from garageSolar hot water - easy and cost effectiveOther electric has no quick fixReduction in load is probably more attractive than 100% solar electricReplace car (60% less petrol consumption)Shade sails and skylight modifications for summer coolingExplore space heating and cooling (ground source heat pumps??)

  • Limitations of (electric) audit methodPoor resolution of electric meters (1 kWhr minimum step)Difficult to separate multiple loadsVery indirect methodnot easy to focus on any particular device (e.g. refrigerator efficiency)Needs rather obsessive behaviour (difficult for loved ones)Separate portable meter availability??

  • Example of poor resolution Background (overnight) electrical consumptionStandby appliances unpluggedStandby appliances connected

  • Powermate meter from ATADavid Hornsby (phone 9631 5413 direct)kWhr resolution 0.1 or 0.01Piggy-back plugAvailable for loan - 1 week $60Purchase price ~$300 for ATA members

  • Initial cost-benefit ranking

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