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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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Presentation Transcript
slide1

MWRA Sustainable Energy in Water sports

Energy Efficiency & Renewables on the Water

slide2
Understand drivers for energy use on the water

Options for Energy efficiency

Options for Renewable energy

Objectives

slide3
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)

slide4

Simple stuff first

  • 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.
slide5

Luminous Efficacy (circuit)

Understanding how much energy we use

slide6

Deep Cycle Lead acid batteries

  • 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
slide8

Renewables

  • 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
slide9

Renewables

  • 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
slide10

Renewables

  • 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)
slide11

Renewables

  • 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
slide12

Summary

  • 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
slide13

Motive Power

  • Biofuels
  • Solar powered boats
slide14

Paul Kenny B.E C.Eng MIEI

  • Senior Energy Consultant
  • T: 052 74 43090
  • F: 052 74 43012
  • E: info@tea.ie
  • W: www.tea.ie
  • Tipperary Energy Agency
  • Craft Granary
  • Church St
  • Cahir
  • Co. Tipperary
  • Ireland