Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Geoexchange and Thermal Potential at Geoscience

86 views

Published on

Geoscience Australia was one of the original geoexchange
or GSHP systems in Australia. Now over 20 years old, the building recently hosted an information session on electrification of heating and cooling in the ACT. Speakers included ACT Government representative as well as this presentation on thermal potential and the role of renewable thermal energy in the removal of thermal gas from our buildings.

Published in: Engineering
  • Be the first to comment

  • Be the first to like this

Geoexchange and Thermal Potential at Geoscience

  1. 1. The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity Presented by: Yale Carden GeoExchange Australia Pty Ltd 27 June 2018
  2. 2. Presentation Overview  Start With Why  What is Thermal Potential?  Enhancing Energy Efficiency / Productivity  Geoexchange 101  Case Studies  Conclusions The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  3. 3. The First Why  ‘…we must consider environmental sustainability as one of the world’s greatest challenges.’  ‘…must promote sustainability through educational programs and school operations.’  ‘We must focus on minimising our carbon emissions and environmental footprint through energy, water consumption and waste recycling.’ The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  4. 4. The Other Why: Cost and Performance  Operations:  Existing system becoming old and maintenance increasing  Cost:  Increasingly expensive to operate  Comfort:  Uncontrollably warm in summer months The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  5. 5. Parallels with Energy Sector Energy Sector HVAC Sector Local Energy Potential Local Thermal Potential Renewable Sources Renewable Sources Decreasing Demand Decreasing Demand Energy Storage Thermal Storage Controls: Smart Meters Controls: Optimised Strategies Decentralising Systems Centralising Systems The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  6. 6. Renewable (Electrical) Energy Potential The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  7. 7. Renewable (Electrical) Energy Potential The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  8. 8. Typical Commercial Heating / Cooling System Cooling Towers Boilers  Ambient air  Use water  Legionella control  Burn fossil fuels  Non-renewable  Alternative gas supplies The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  9. 9. What is Thermal Potential?  Demand Management Tool – the (forgotten) half of the energy equation  Thermal is energy too!  Thermal energy can also be renewable – not just about burning gas and fossil fuels  Thermal potential consists of:  Heat sources (heating)  Heat sinks (cooling)  Thermal energy storage, including phase change materials  Multiple thermal sources in the built environment The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  10. 10. Integrating to Enhance Energy Productivity  Renewable (Electrical) Energy  Renewable (Thermal) Energy  Can we integrate the two and enhance energy productivity?  Greatest $ output for smallest kW input BECOMES  Greatest $ / kW output for smallest carbon input Source: www.sbrc.uow.edu.au/sbrcbuilding/index.html The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  11. 11. Geoexchange 101: The Basics The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  12. 12. Geoexchange 101: The Basics  Transfers heat from the earth into the building in winter (earth as heat source)  Transfers heat from the building into the ground in summer (earth as heat sink)  Geoexchange or low temperature geothermal NOT ‘hot rocks’  Solar radiation not heat from the Earth’s crust The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  13. 13. The Geoexchange Cooling Cycle The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity 17 C 40 C
  14. 14. The Geoexchange Heating Cycle The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity 17 C -5 C
  15. 15. Ground Heat Exchanger The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  16. 16. Energy Piles The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  17. 17. Sewer Heat Recovery  Also includes wastewater / treated effluent  Not just heating – cooling also possible  20-25C heat source / sink is common  Match ‘water’ flow to heating / cooling requirements  Local projects using treated effluent:  Hobart Aquatic Centre, Hobart  Grand Chancellor Hotel, Hobart The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  18. 18. District Geoexchange Systems The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  19. 19. Thermal Energy Storage 0 5000 10000 15000 20000 25000 30000 35000 40000 0 2 4 6 8 10 12 TotalLoads(kWhrs) Time (Months) Cooling (kWhrs) Heating (kWhrs) Short term storage: Simultaneous or diurnal Annual storage Heat Rejection Heat Extraction Heat Rejection The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  20. 20. GSHPs: Water to Water / Reversible Chillers (Pool) The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  21. 21. GSHPs: Water to Air (Ducted) Units The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  22. 22. Case Study: St Peters College  Existing system uses ambient air  Thermal potential approach considered the following:  Gas;  Ambient air (used for heat recovery);  Ground with vertical borehole GHX;  Ground with horizontal GHX;  River water under existing irrigation license;  Treated effluent.  River water was Client preference. However, logistical and future-proofing issues;  Vertical GHX preferred over horizontal GHX  Minimise impact on sport fields;  Enable future expansion of system. The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  23. 23. The Ground Heat Exchanger The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  24. 24. The Ground Source Heat Pumps  2 x water to water / reversible chillers  6 x various water to air (ducted) GSHPs  Heat Recovery System  Variable Speed Pumps The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  25. 25. Energy Efficiency Opportunities 56% 8% 3% 25% 8% Energy Efficiency Opportunities Geoexchange Plant Upgrade Fresh Air Heat Recovery Roof Pool Blanket Ducted GSHPs The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  26. 26. Case Study: RHBEEP - Tumut (Snowy) Shire Council The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  27. 27. Case Study: RHBEEP - Tumut (Snowy) Shire Council  Building energy savings: 80 % or $94 000 per annum  HVAC energy savings: 71 % or $85 000 per annum  Maintenance / tenancy savings: $80 000 per annum  Electricity demand reduction: 151 kVA (75 %) Geoexchange at 49 %  Annual GHG Reduction: 79 tCO2  Simple Payback: 7.6 years  Return on Investment: 11-12 % The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  28. 28. Case Study: Geoscience Australia  The Ground Heat Exchanger:  350 Boreholes  104 m deep  1.25” diameter polyethylene pipe  4.5 m spacings  Ground Source Heat Pumps:  220 x WaterFurnace water to air GSHPs: Premier2  2-speed compressor  3-speed fan  BMS connectivity  R22 refrigerant The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  29. 29. Case Study: Geoscience Australia The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  30. 30. Case Study: Geoscience Australia The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  31. 31. Case Study: Geoscience Australia The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  32. 32. Conclusions: Enhancing Energy Efficiency?  Create energy from renewable sources – use as efficiently as possible  Thermal is energy too…and it can be renewable  Identify local thermal potential  Can we use renewable (thermal) energy when renewable (electrical) energy is available?  Timing issues? Storage is the key – electrical or thermal  Optimised / Predictive Control Strategies  Canberra is ideal climate for the technology with great local case studies The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity
  33. 33. Thank you Yale Carden GeoExchange Australia Pty Ltd Phone: 02 8404 4193 Email: ycarden@geoexchange.com.au Website: www.geoexchange.com.au The RHBEEP Project www.tumut.nsw.gov.au/riverina-highlands-building-energy-efficient-project-rhbeep.aspx Sustainable Buildings Research Centre, University of Wollongong www.sbrc.uow.edu.au The Role of Thermal Potential in Enhancing Energy Efficiency / Productivity

×