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ARCH-432

ARCH-432. Human Comfort. Ice Cream Social Today. 3:00 to 5:00 Behind Dana and Sloan. All School Meeting. 4:00 to 5:00 Daggy Theater. 4:00 to 5:00 Daggy Theater. Attendance. When was the first recorded example of a bioterrorist attack? France (1210 AD) Rome (65 AD) Persia (600 BC)

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ARCH-432

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  1. ARCH-432 Human Comfort

  2. Ice Cream Social Today 3:00 to 5:00 Behind Dana and Sloan

  3. All School Meeting 4:00 to 5:00 Daggy Theater 4:00 to 5:00 Daggy Theater

  4. Attendance • When was the first recorded example of a bioterrorist attack? • France (1210 AD) • Rome (65 AD) • Persia (600 BC) • Egypt (1400 BC) • Mesopotamia (5200 BC)

  5. Attendance C. Persia (600 BC) During the siege of a City, a Persian King poisoned the well serving the city with rye ergot, a common mold often found on bread. Scientists speculate that the Salem witch trials may have been precipitated by the same mold outbreak, whose symptoms include paranoia, hallucinations and, in severe cases, death.

  6. What You Need to Know • Understand the basic terms and principles of human comfort • Know what makes people comfortable and uncomfortable

  7. What You Need To Be Able To Do • Specify comfortable conditions based upon occupancy, met level and clo value • Comfort zone a building

  8. Terms • Comfort • Occupied zone • Personal parameter • Met rate • Clo Value • Mean Radiant Temperature (MRT) • Temperature zoning

  9. Comfort “The condition of mind that expresses satisfaction with the thermal environment. A building is considered comfortable when 80% or more of the occupants will find the environment thermally acceptable” ASHRAE Standard 55-2004

  10. Comfort Concerns • Can be very emotional • Can be very subjective • Can be very costly Source: Lincoln Journal and Star

  11. Comfort v. Productivity • Research from Texas: • Building conditions can impact student achievement by as much as 17% • Any temperature over 74° F harms student’s math and science scores

  12. Environment Air temperature Radiant temperature (MRT) Building orientation Humidity Air speed Noise Lighting Personal Parameters Clothing (clo) Metabolism (met) Age Size Comfort Criteria

  13. Personal Parameters – Met & Clo Source: Bradshaw reading assignment

  14. Heat Transfer from Occupants • How do people transfer heat to maintain comfort?

  15. Met (Metabolic Rate) value Human reactions to met value Clo value Human reactions to clo value Personal Parameters How do you change the environment to match the Met and the Clo?

  16. Temperature zone = a space or group of spaces within a building with heating and/or cooling requirements sufficiently similar that comfort conditions can be maintained by a single controlling device. Criteria for a temperature zone? Temperature Zones

  17. More zones more cost $? More zones less cost$? Temperature Zones

  18. Clo Value • T F Increasing the Clo value in the winter is a way to save energy in the winter months in Pullman Washington. • T F A Clovalue corresponds to a person’s ability to gain or lose heat.

  19. Temperature Zones At what operating point is any HVAC system most efficient?

  20. Team Problem Solving • Considering initial cost, comfort, activity (met level) and energy conservation, how many different temperature zones should be included on the next slide? • 1 to 3 • 4 to 5 • 6 to 7 • 8+

  21. One Answer Zones not colored are unconditioned

  22. 4,800 CFM - 200 CFM - 150 CFM 4,450 CFM

  23. 4,450 CFM • 820 CFM • 3,630 CFM 4,450 CFM 820 CFM 350 CFM 150 CFM -150 CFM 0 CFM

  24. Fresh Air at 720 CFM 4,450 CFM 820 CFM 350 CFM 3,630 CFM + 150 CFM + 720 CFM 4,500 CFM What happened to the remaining 300 CFM?

  25. Fresh Air at 720 CFM 4,450 CFM 820 CFM 350 CFM What happened to the remaining 300 CFM? Answer : 300 CFM Being pulled out of instructors dressing room 300 CFM

  26. Fresh Air at 720 CFM 4,450 CFM 820 CFM 350 CFM Neutral 4,080 CFM - Air 300 CFM

  27. Fresh Air at 920 CFM 4,450 CFM 920 CFM 820 CFM 350 CFM Neutral 3,880 CFM + Air 100 CFM

  28. Mother Nature • Mother nature MUST balance Herself!

  29. Temperature Zones • Is there a DB Temperature and RH that would provide the optimal comfort in the spaces you have identified?

  30. Green/High-Performance Rules of Thumb • Winter • Move to the left to reduce energy • You can move further left if you move up • You can move further left if you reduce velocity

  31. Green/High Performance Rules of Thumb • Summer • Move to the right to reduce energy • You can move further right if you move down • You can move further right if you increase velocity

  32. Take-Aways (the ‘Ah-hahs’) • Comfort is a moving target • Aim for 80% acceptance • Focus on the criteria you can control • Keep both eyes on ASHRAE-55 • Zone to optimize performance and comfort

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