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Green Hotel Concepts September 2010

Green Hotel Concepts September 2010. Our Offices. Our Services. Benchmarking. Benchmarking & Monitoring. How much energy do hotels use?. Hard to benchmark Different metrics Guestnights Area Serviced Area Gross Internal Area (or Built Up Area) Total Area (including balconies)

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Green Hotel Concepts September 2010

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  1. Green Hotel Concepts September 2010

  2. Our Offices

  3. Our Services

  4. Benchmarking

  5. Benchmarking & Monitoring

  6. How much energy do hotels use? • Hard to benchmark • Different metrics • Guestnights • Area • Serviced Area • Gross Internal Area (or Built Up Area) • Total Area (including balconies) • Big variance • Star Rating • Climate • Metrics used Excludes corridors, plant rooms, etc 5 Star hotels & resorts in Abu Dhabi Source: Energy Benchmarking study for Abu Dhabi Hotel Sector by ElieGerges El Choufani (2010). Sponsored by Cundall.

  7. Energy (kWh / m2 of serviced space) 4-5 stars 280 to 320kWh/m2 3 stars 260 to 280kWh/m2 2 stars 240 to 270kWh/m2 Serviced Area = 300 kWh/m2 Gross Int Area = 275 kWh/m2 www.benchmarkhotel.com

  8. Hotel Energy - UK • UK Display Energy Certificate • 105kWh/m2 – electricity • 330kWh/m2 – gas • 435kWh/m2 – TYPICAL 4 hotels in 2008 DEC database of 28,000 buildings

  9. Green Guidelines for Hotels Cundall Role: • Green Building Guidelines for Abu Dhabi Tourism Authority (ADTA) for their new and existing hotels. • Our initial focus will be in the areas of water, energy and waste reduction for the existing 113 hotels in Abu Dhabi.

  10. 5 star hotels in Abu Dhabi Gross Internal Area = 567 per m2 of net lettable area

  11. Hotel Energy - Asia

  12. Water (m3 per guest night)

  13. Waste (kg per guest night)

  14. Reducing Energy & Carbon

  15. Reducing energy in hotels • People using buildings use energy • Expectations • Behaviour • Passive design • Where is energy consumed? • Light • Equipment • Air • Cooling • Heating – space & water • Renewables

  16. Steps to low carbon design Off site Invest in off site renewables Renewables On-site renewables biomass, solar, wind, micro-hydro Gas CHP, geothermal Heat Recovery Air to air, waste heat from chillers Aquifer Thermal Storage Energy Efficiency Heating, cooling & ventilation systems Control strategy Internal Loads Lighting & Equipment (W/m2) Controls – turn off Reducing energy consumption Passive Design Form: daylight & natural ventilation Fabric: insulation, facade, thermal mass Design Criteria & Expectations Comfort criteria, lighting levels, fresh air quantity, shower flows

  17. Thermal Comfort is 21 to 24ºC ? Air Temperature & Humidity – only part of the issue Comfort criteria = natural ventilation or air conditioning!

  18. Facade influences energy Light Equipment Air Cooling Heating

  19. PassivHaus – minimise heating • Thermos Flask Building • Super insulation • Airtight • Winter heating • Mechanical vent with heat recovery • Tiny heating system • Summer cooling • Open the windows • Expensive but effective PassivHaus Uwindows = 0.8 Uwalls = 0.1 Uroof = 0.1 Permeability = 0.05ach

  20. Secure Natural Ventilation Double Glazing with Interstitial blind. Window is openable. Ventilation panel allows secure, bug free ventilation. Example window system – Scandic Hotel, Sweden

  21. High Tech Cooling: Ceiling Fans?

  22. Green Hotel Concept

  23. Hotel Room Concept • Low Energy: Comfort + Air Quality • 100% outside air heat recovery unit with heating coil • No mechanical cooling • Thermal mass to moderate temperatures • Ceiling fan for improved summer comfort • Passive Design • Shading to suit orientation • Openable window • Highly insulated & sealed facade • Uwalls = 0.22 • Uwindow = 1.8 • Air Tightness = 4m3/hr

  24. Variation (modular bathroom pod) Heating Hot Water circuit could supply chilled water for cooling. Fresh Air Supply could be tempered in peak summer conditions

  25. LEDs are improving LED linear replacement lamps available today do not compete with linear T8 fluorescent lamps on the basis of light output, colour quality, distribution, lumen maintenance, or cost-effectiveness. Source: US Dept of Energy (2010)

  26. Which controls would you prefer? Simple? Complicated? OFF Warmer Cooling Fresh Air Only Cooler Heating

  27. Reduce hot water use • Hot water = 25%+ of hotel energy consumption • Reduce water use: • 8l/min showers • 4l/min taps Hoxton Hotel, London Interesting towel sign (heavy) rain shower

  28. Guest education is important Notice in bedroom – Scandic Hotel, Sweden

  29. Renewables

  30. Renewable Heat Solar Hot Water Biomass Boiler Heat Pump (air or ground source)

  31. Solar Hot Water Hampton by Hilton, Brasov

  32. VatraDornei Hotel Ground Source Heat Pump plus Biomass Boiler (+ Solar Thermal for DHW & swimming pool)

  33. Renewable Electricity Photovoltaic Panels Wind Turbines Biofuel Combined Heat & Power (CHP)

  34. Steps to low carbon design Off site Invest in off site renewables Renewables On-site renewables biomass, solar, wind, micro-hydro Gas CHP, geothermal Heat Recovery Air to air, waste heat from chillers Aquifer Thermal Storage Energy Efficiency Heating, cooling & ventilation systems Control strategy Internal Loads Lighting & Equipment (W/m2) Controls – turn off Reducing energy consumption Passive Design Form: daylight & natural ventilation Fabric: insulation, facade, thermal mass Design Criteria & Expectations Comfort criteria, lighting levels, fresh air quantity, shower flows

  35. David Clark d.clark@cundall.com 18-20 Louis Blanc Ground Floor Sector 1, 011752 Bucharest Tel. +40 21 208 02 30 Str. I.P Voitesti nr 1-3/ 54 400153 Cluj Napoca Tel. +40 264534240

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