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Achieving Dry Outside Air in an Energy-Efficient Manner

A/E. Environment. PSU. Achieving Dry Outside Air in an Energy-Efficient Manner. Stanley A. Mumma, Ph.D., P.E., Professor, and Kurt M. Shank, M.S. Graduate Department of Architectural Engineering College of Engineering Penn State University @ University Park, PA.

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Achieving Dry Outside Air in an Energy-Efficient Manner

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  1. A/E Environment PSU Achieving Dry Outside Air in an Energy-Efficient Manner Stanley A. Mumma, Ph.D., P.E., Professor, and Kurt M. Shank, M.S. Graduate Department of Architectural Engineering College of Engineering Penn State University @ University Park, PA Building Thermal and Mechanical Systems Laboratory

  2. Presentation Outline • Introduction and Objectives • Potential Dedicated OA System Configurations • Psychrometric Analysis of the DOAS • Load and Hourly Energy Analysis of the Configurations • Conclusions and Recommendations

  3. Objective • Develop a fundamental understanding of OA preconditioning equipment for dedicated OA systems composed of: • Passive desiccant wheels, • Sensible heat exchangers, • Deep dehumidification cooling coils. • Present the design load and energy performance perspective.

  4. Potential Configurations • #1, Conventional Cooling Coil, Heating Coil, and Humidifier; Humidifier HC CC OA

  5. #2, A Run around heat recovery system added to configuration #1. Humidifier HC CC OA

  6. #3, Passive Desiccant (Enthalpy) wheel added to the heating and cooling coils RA CC HC OA EW

  7. RA HC CC OA EW • #4, Enthalpy wheel, Cooling Coil and run around Heat Recovery

  8. State Point #, typ 80F DBT, 55F DPT • #5, Dual Wheel DOAS Unit RA 6 5 CC 3 0 1 2 4 55F DBT, 45F DPT OA 45F PH SW EW

  9. #6, Conventional All Air VAV System with air side Economizer. • Illustration unnecessary

  10. Design energy demand to treat10,000 scfm of OA in Atlanta

  11. Energy consumed to treat 10,000 scfm of OA in Atlanta (3744 hr)

  12. Four Regions on the Psych. Chart, w/ Atlanta Data Region A, 1,635 hours Region B, 784 hours Region D, 214 hrs 5 6 Wet regions 3 4 Dry regions Region C, 1,111 hours 70 80 45 55

  13. State Point #, typ 80F DBT, 55F DPT • #5, Dual Wheel DOAS Unit RA 6 5 CC 3 0 1 2 4 55F DBT, 45F DPT OA 45F PH SW EW

  14. Region A, enthalpy wheel, cooling coil, and sen. wheel Key: 1-2-6, enthalpy wheel 2-3, cooling coil 5-6, 3-4, sen. wheel 1 2 5 6 3 4 70 80F 45 55

  15. Region B, cooling coil,and sen. wheel Key: 1/2-3, cooling coil 5-6, 3-4, sen. wheel 1,2 5 6 3 4 70 80F 45 55

  16. Region C, enthalpy wheeland cooling coil Key: 1-2-5/6, enthalpy wheel 2-3/4, cooling coil 5, 6 2 3, 4 1 70 80F 45 55

  17. Region D, enthalpy wheel,and sen. wheel Key: 1-2-6, enthalpy wheel 5-6, 3-4, sen. wheel 6 5 2 3 4 1 70 80F 45 55

  18. Control Status of DOAS Equipment (See Tech Paper 4428)

  19. Conclusions: • The DOAS, configuration 5, exhibits superior demand and energy performance when compared to the other configurations analyzed. • The DOAS assures verifiable ventilation delivery. • Decoupled sensible and latent cooling contributes to improved comfort, health and productivity

  20. Recommendation: • Make the transition to dedicated OA designs. • Use configuration 5 to decouple the space sensible and latent loads. • Save energy, improve quality of the spaces, and minimize litigation potential.

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