Presentation on theme: "SOLAR THERMAL WATER HEATING SIMON WHELAN. Topics Solar Thermal Water Heating Types of panels Flat plates Vacuum tubes CylindersCost/Payback."— Presentation transcript:
SOLAR THERMAL WATER HEATING SIMON WHELAN
Topics Solar Thermal Water Heating Types of panels Flat plates Vacuum tubes CylindersCost/Payback
Solar Water Heating- uses Domestic water heating - High grade heat from the sun - Mostly showers and washing - - Dishwashers, washing machine often heated separately – need direct hot feed appliances Space Heating Support - - Large capital and material investment - - Most energy in Summer when needed least - - Better bang for heating buck in insulation and design
Water heating - % of your energy use
How do solar panels work 3 energy flows - heat collection, heat loss, heat transfer
Domestic Solar Water Heating A. Solar panels B. Pump Station C. Cylinder D. Boiler
4 main things to consider 1.Orientation - - South is best, - - Anywhere between SW – SE OK - - East West requires specific system 2. Occupancy = Water Usage =Size of Cylinder - 50 L of hot water per person a day 3. Type of Panel – Flat Plate or evacuated tube 4. Size of Array
Two main Types of Panel; Flat plate panels Flat plate panels -In Roof -On Roof Vacuum tube Vacuum tube -direct contact water heating -Single-walled vacuum tube with heat pipes -Twin-walled vacuum tube with heat pipe
Flat Panel – In roof - Galway
Flat Panel – In roof - Celbridge Flashing to weather proofFlashing to weather proof Very Similar to Velux WindowsVery Similar to Velux Windows
Flat Panel – In roof - Celbridge Install roof covering (slates/Tiles) around flashingInstall roof covering (slates/Tiles) around flashing No wind load issuesNo wind load issues Pipework runs directly in to the attic space – no roof penetration issuesPipework runs directly in to the attic space – no roof penetration issues
Flat Panel – on roof - Delgany Use of brackets on tile roof Alumium Profile to support panels
Advantages of Flat plates Durable option – long life time years Better Aesthetics – great looking panel flashed into roof Can take up less surface area on roof than evacuated tubes
Vaccuum tubes: Bray
Vaccuum tubes –Heat pipes
Multiple panels in in Bray- straight connection. Frame on roof contains tubes – mutiple panels in series
Flat roof: Watch the wind load
Ground mount: Long Pipe Run – inefficiencies introduced
ADVANTAGES OF TUBES Typically more efficient than FP per m 2 of Aperture area Typically more efficient than FP per m 2 of Aperture area –Totally insulated – no heat loss –Passively tracking – Incident Angle Modifier –Lower thermal mass Lighter to lift into place Lighter to lift into place Sit on top of slates – easier to retrofit Sit on top of slates – easier to retrofit Double wall vacuum tubes are potentially a very sustainable product in Ireland. Double wall vacuum tubes are potentially a very sustainable product in Ireland.DISADVANTAGES Aesthetics Aesthetics Maintenance required after 15 to 20 yrs but modular Maintenance required after 15 to 20 yrs but modular
Pump station installation Attic installation Controller in accessible position Expansion Vessel installed below pipe line Blow off vessel 3 port valve (HT) to heat dump Need power point – fused circuit in area.Attic installation Controller in accessible position Expansion Vessel installed below pipe line Blow off vessel 3 port valve (HT) to heat dump Need power point – fused circuit in area.
Solar Controller: Resol BS3 Temperature displays Temperature displays Controls Pump Controls Pump Frost-protection Frost-protection Store temperature limitation Store temperature limitation Excess heat dissipation to radiator or can be after heat function Excess heat dissipation to radiator or can be after heat function
Solar Cylinders Dual/Triple coil Cylinders – Tall = better stratification – Insulation thickness 50mm min – Copper or Stainless steel – High efficiency solar coil - 20% of panel surface area – Two sensor ports for controller temperature probes – Consider weight of larger cylinder!
Choosing a System – Look for Energy yield not Efficiency Sun is a moving energy source. Panels differ Zero loss efficiency describes efficiency at normal incidence - Noon Not sufficient to describe performance accurately.
Choosing a System – Look for Energy yield not Efficiency Incident Angle Modifier Energy yield of system Not efficiency of panel TSol/DEAP/Test results Establish Cost/Benefit
Costs and Payback How long is a piece of string? Typical cost range from E4500 – E5500 installed Typical cost range from E4500 – E5500 installed Grant aid brings cost to 3500 – 4000 Grant aid brings cost to 3500 – 4000 Change in subsidy structure is forecast Change in subsidy structure is forecast Many variables:level of water use Many variables:level of water use Cost/type of primary heating Durability of solar system – long term Future energy costs At todays prices solar can contribute approx Euro200 – 300 per annum. At todays prices solar can contribute approx Euro200 – 300 per annum. Hartwick Rule: Invest profits from natural resource use in technological replacements Hartwick Rule: Invest profits from natural resource use in technological replacements
Commercial Installations: Hotels/B&BS – solar makes a lot of sense Old Rectory Kinsale:
Tesco – large daytime occupancy:
Further information: Further information: Thank You! Thank You!