MWRA Sustainable Energy in Water sports
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MWRA Sustainable Energy in Water sports Energy Efficiency & Renewables on the Water. Understand drivers for energy use on the water Options for Energy efficiency Options for Renewable energy . Objectives. Typical energy use of a standard 100w light bulb in a sitting room

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MWRA Sustainable Energy in Water sports

Energy Efficiency & Renewables on the Water


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Understand drivers for energy use on the water

Options for Energy efficiency

Options for Renewable energy

Objectives


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Typical energy use of a standard 100w light bulb in a sitting room

Turn off the light when we’re not in the room

Use a more efficient source say a 20w CFL. Still the same light delivered.

If the sitting room is too bright lets put in a 10w bulb

Then we install renewable energy

Principles Of Energy Efficiency

1000 hrs a year 100w or 100,000 watt hours or 100 kwh (€17)

700 hrs a year 100w or 70 kwh (€12)

Increasing Effort, Savings, investment

700 hrs 20w or 14 kwh (€2.40)

14kwh

7

700 hrs 10w or 7 kwh (€1.20)


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Simple stuff first sitting room

  • Turn it off when not in use.

  • Maintain systems

    • N.B De-ice freezers!

    • Properly tensioned alternator belt

    • Good electrical contacts & wiring

  • Add cold items to fridge if possible

  • Buy efficient: get certification/ data not salesmen.


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Luminous Efficacy (circuit) sitting room

Understanding how much energy we use


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Deep Cycle Lead acid batteries sitting room

  • Typically are 70% efficient & Lose ~1%/week

  • Can use up to 80% power (50% for starting batteries)

  • Repeated excess discharges reduces storage and efficiency.

  • Limited max charging rate - ~10A charge (110 AH)

  • Ideally suitable for smoothing out charge & use patterns.

  • 110 AH leisure battery =>110 x 12.5V = 1375 Watt hours

  • Deep Cycle 80% recoverable => 1100 Wh or 1.1kWh

  • Or 1 amp for 120 hours (x0.8) ~ 100 hours

  • 5 amps for 20 hours….10 amps for 10 hours… etc



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Renewables sitting room

  • Prior to installing renewables – bring down load first

  • Energy efficiency much cheaper than renewable energy

  • Estimate load and use of all appliances

  • Estimate occupancy & pattern of use:

    • Blue water cruising Vs Weekend use.

    • Coastal (diesel available) Vs Ocean

  • Size storage (batteries) Vs use & generator capacity


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Renewables sitting room

  • Solar Panels: Three types

  • Not all solar panels are the same:

  • Cost Vs Efficiency must be noted

  • Solar charge controller required.

  • Prices tumbling (20% - 30% per annum)

  • Great for trickle charging – keeping batteries healthy


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Renewables sitting room

  • Wind Generators:

  • Wind proportional to Cube of windspeed – high windspeeds necessary

  • Necessary to mount as high as possible off deck (wind speed proportional to height off ground).

  • Clear air if possible (rear mount generally)

  • Intermittent (Battery sizing important)

  • Use wind power curve to evaluate

  • Typical outputs for costal marine would be 25% of rated capacity (15-20% inland)


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Renewables sitting room

  • Tow Generator

    • Needs 4kts to have reasonable output

    • Good for long cruising passages

    • Reduces boat speed – useful when excess

      wind present

    • Pointless under power.

    • Issues with chaffing

  • Harness electricity off propeller (engine off)

    • Reduces boat speed

    • Need to gear up (pulley(s))

    • Need to balance forces on prop shaft

    • Only worthwhile for blue-water cruising


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Summary sitting room

  • Do an Energy Audit – Power rating and usage time

  • See what can be reduced in time (switch off!)

  • Any maintenance requirements – healthy battery etc.

  • See what energy efficiency upgrades can be done

    • Interior lights

    • Navigation lights

    • Re-fridgeration

  • Renewables

    • battery trickle charger (10 W solar)

    • Light loads for weekends etc 60W solar + backup engine

    • Heavy loads: consider wind + solar combination


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Motive Power sitting room

  • Biofuels

  • Solar powered boats


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  • Paul Kenny sitting roomB.E C.Eng MIEI

  • Senior Energy Consultant

  • T: 052 74 43090

  • F: 052 74 43012

  • E: [email protected]

  • W: www.tea.ie

  • Tipperary Energy Agency

  • Craft Granary

  • Church St

  • Cahir

  • Co. Tipperary

  • Ireland


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