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Split Air Stream Desiccant Cooling

Split Air Stream Desiccant Cooling. Staff of 17, founded 1989 Design, energy studies, research Over 150 design projects, including LEED 2005 R&D100 award for energy software 2006: Developed EPA Energy Star pilot protocol for high-rise multifamily buildings

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Split Air Stream Desiccant Cooling

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  1. Split Air StreamDesiccant Cooling

  2. Staff of 17, founded 1989 Design, energy studies, research Over 150 design projects, including LEED 2005 R&D100 award for energy software 2006: Developed EPA Energy Star pilot protocol for high-rise multifamily buildings 2007: NYSERDA QA multifamily consultants; open NYC office Taitem Engineering

  3. Ian Shapiro – principal investigator Yossi Bronsnick – prototype design Crista Shopis – prototype fabrication and assembly Nate Goodell – controls Jim Hauswirth – costing, component selection Jim Holahan – testing and modification assistance Staffing

  4. A new cooling cycle Efficiency over 1.2 COP, likely higher, (compared to 0.7 COP for existing technologies) Fossil-fuel or solar-fired Quiet (no compressor) Outstanding humidity control A possible path to zero-energy buildings Split Air Stream Desiccant Cooling: The Potential

  5. Air Conditioning = Reducing Air Temperature + Dehumidification The Air Conditioning Equation

  6. Geothermal well technology has developed much in the last few years “Free” source of “coolth” But: Well water temperatures not cold enough to dehumidify directly Source of the Idea: Geothermal Coolth

  7. If we split an air stream, heat one of the two streams, and then pass both through a desiccant wheel, the heated and humidified air stream dewpoint will rise above the temperature of ground water. The Idea

  8. If we split an air stream….heat one of the two streams….and then pass both through a desiccant wheel… the heated and humidified air stream dewpoint …will rise above the temperature of ground water. In Slow Motion

  9. Psychrometric Chart

  10. Efficiency – Projection in Original Proposal

  11. Efficiency – More Recent Projection

  12. Impact of Airflow Ratio

  13. Prototype Design

  14. Efficiency: 1.2 COP Capacity: 1.5 tons Sensible Heat Ratio: 0.8 First Successful Test – Monday July 28

  15. Humidity controllability is outstanding Lots of dials to turn: Heat input Fan speed Desiccant wheel speed Airflow ratio Which means: Sensible Heat Ratio from 0 – 1.0 Typical air conditioner’s maximum Sensible Heat Ratio is about 0.75 Other Findings

  16. Let people apply it as they wish Possible heat sources: Boiler Solar Waste heat 60°F cooling “sink”: Geothermal Lake Low-lift chiller Direct expansion hybrid Industrial dehumidifier The Vision: A Simple Four-Pipe Fan Coil

  17. Higher fan power needed Potential high construction cost Slightly larger equipment physical size Larger duct size The Risks and Challenges

  18. NYSERDA Contract #1: Feasibility Study Syracuse CoE Contract Prototype completed Patent Application pending Lab test at S.U. (summer/fall 2008) NYSERDA Contract #2 Build second generation prototype Test it at Taitem office building (likely start winter 2008-2009, focus for summer 2009) Plan / Next Steps

  19. Funding for test work Assisted in development of quality assurance plan for EPA Link to BEES lab Co-funding for NYSERDA project Help with intellectual property issues Public relations assistance Independent evaluation Intern How CoE is Helping

  20. A new cooling cycle Efficiency over 1.2 COP, likely higher Fossil-fuel or solar-fired Quiet (no compressor) Outstanding humidity control A possible path to zero-energy buildings Split Air Stream Desiccant Cooling: Summary

  21. Questions?

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