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Ground source heat pumps[1]sk

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DT117/4 Sustainable Build & Design - Class Presentations

DT117/4 Sustainable Build & Design - Class Presentations

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    Ground source heat pumps[1]sk Ground source heat pumps[1]sk Presentation Transcript

    • Ground Source Heat Pumps
      Presented by Sean Keegan
      Suitable Build & Design
      Lecturer Sonya Daly
      GSHP Sustainable Build & Design Sean Keegan
    • GSHP uses Geothermal Energy from heat exerted by the earths core
      The ground maintains stable temperature between 11-13oC
      Energy can be recovered from the ground, water or air but GSHP’s utilizes the stable ground temperature as its source of energy
      Substitute for conventional heating systems
      Can be a considered zero-carbon source of energy
      Introduction to GSHP
      GSHP Sustainable Build & Design Sean Keegan
    • Types of GSHP
      • Horizontal Collector system:
      • laid in trenches 0.5-1.8m
      • Vertical Collector system:
      • laid in bores 100-150mm diameter & 20-150m deep
      • Direct expansion heat transfer- open loop
      • Indirect expansion heat transfer- closed loop
      GSHP Sustainable Build & Design Sean Keegan
    • System consists of a ‘ground loop’ pipe
      Filled with a mixture of water and antifreeze (Glycol) buried in a trench or borehole
      Electric pump powered by electricity/solar /wind source circulates mixture in loop.
      ‘Pump up’ collected heat at low temperature and release it at a higher temperature.
      Transfers the heat collected to a hot water tank.
      Heat is then used to supply under floor heating or radiators.
      Indirect system uses secondary pipe work and closed loop.
      Direct expansion heat transfer- open loop, more efficient but environmental issues and more system design needed because of inflexible copper work.
      GSHP- Sean Keegan
      How does GSHP work?
    • Radiators, underfloor heating and hot water supply.
      Recommended for newly constructed houses with adequate insulation and air-tightness that meet the latest building regulations.
      Suited to homes with under-floor heating.
      Not generally suitable for properties with existing gas-fired central heating systems.
      Temperature delivered between 45-55oC for general use and 30-45oC for under floor heating.
      • Hot water in cylinder will be pumped up by an emersion to meet require temperature.
      • Can be incorporated in concrete piles.
      Areas of use
      GSHP Sustainable Build & Design Sean Keegan
    • Installation
      Materials
      Indirect Collector: highly-density polyethylene pipe; flexible closed loop
      Direct expansion: copper pipe; direct installation
      Methods
      Horizontal: trenches 0.5-1.8m deep, excavated by a digger
      Vertical: bore holes 20-150m deep, excavated by a drilling rig
      GSHP Sustainable Build & Design Sean Keegan
    • Efficient performance needs good thermal contact with the ground- so ensure adequate backfill
      Supplys30-50% of hot water demands- topped up electrical supply
      Insulation costs vary depending on ground condition and choice of vertical or horizontal vertical €10,000-12,000
      Payback 8-10 years, with a 20 year life expectancy
      Every unit of electricity used by the pump, you get between 3-4 units of heat
      You still need to use electricity to drive the pump, so a ground-source heat pump can’t be considered completely zero-carbon unless this is provided by a renewable source, such as solar power or a wind turbine.
      GSHP- Sean Keegan
      Performance
    • Advantages
      15- 50% less than traditional electrical heating or oil heating costs
      No extra maintenance needed same as typical annual boiler services
      Low noise & good visual aesthetics; only pump visible but usually in garage
      cheaper off peak rates can be used to maintain heat within cylinder
      Can provide a well disturbed central heating system
      Lower carbon emissions
      Well suited for underfloor heating
      GSHP Sustainable Build & Design Sean Keegan
    • Initial insulation costs are high
      Groundworks required to dig the trench & bore holes can be expensive and disruptive
      Horizontal installation can be restricted by the size of the building plot
      Not suitable for properties with existing gas-fired wet central heating as the technology works at lower temperatures, making it better suited to homes with under floor heating.
      Disadvantages
      GSHP Sustainable Build & Design Sean Keegan
    • Greener Homes Scheme
      • The Sustainable Energy Authority Ireland operate a Greener Homes Scheme that provide grants to individuals who wish to make there homes more environmentally friend
      • 23% of applications are for GSHP
      • The average successful grant received is €2000
      GSHP Sustainable Build & Design Sean Keegan
    • GSHP’s provide an environmentally friendly heating source
      Initial high investment with reduced utilities bills
      Suitable for new well insulated homes
      Conclusion
      GSHP Sustainable Build & Design Sean Keegan
    • Sustainable Energy Authority Ireland websitewww.seai.ie
      ‘Ground Source Heat Pumps’ Home Heating Systems www.which.co.uk
      ‘Assessment of Hybrid Geothermal Heat Pump Systems ‘(2001), Federal Energy Management Program, U.S. Department of Energy
      ‘Ground Source Heat Pumps: A Technology Review’ (1999) by R. Rawling & J Sykulski, Department of Electrical Engineering, University of Southampton
      References
      GSHP Sustainable Build & Design Sean Keegan