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Station 4 ?? Temperatures and Moisture - PowerPoint PPT Presentation

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Station 4 ?? Temperatures and Moisture

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  1. Station 4 ?? Temperatures and Moisture Moisture Meters Pin Contact Data Loggers Spot Temperature Meter Thermal Imager Cautions and Safety

  2. Measure Moisture

  3. Moisture Meters Contact Type non-destructive reads ~ 3” through materials settings for different materials Pin-Type makes pin holes extension pins available

  4. Preventing Mold Growth Control the Moisture Keep relative humidity in 30–50% range Keep surfaces warm No leaks inside No leaks from the outside Block entry of moist air Control wicking

  5. Control Interior Moisture Contain moisture at the source Remove moisture with exhaust fans Ventilate: Exchange damp indoor air with dryer outside air De-humidification may be necessary

  6. Relative Humidity Saturation of the air … at a given temperature Water holding capacity (%) of the air 50% RH means the air is 1/2 full 90% RH means the air can only hold 10% more water vapor (90% full)

  7. FACT: Warm air can hold more moisture than Cold air Relative Humidity Temperature

  8. Raise the temperature . . . Relative Humidity Decreases Relative Humidity Temperature

  9. Relative Humidity Temperature

  10. Cool closet = higher relative humidity

  11. Dew Point: Temperature at which air becomes completely saturated (100% RH)

  12. “Wet Air” “Dry Air” Different Relative Humidity of the “Air Film”

  13. Mold and Moisture Materials only need to be at 85% to 90% relative humidity to support mold growth

  14. Mirror reached dew point in Spokane on a hot summer day

  15. Mirror temperature changed little, but moisture in the air changed (high RH%)

  16. Preventing Mold Growth Control the Moisture Keep relative humidity in the 30 to 50% range Keep surfaces warm

  17. Important to understandcondensationDew Point Calculatordpcalc.org http://www.dpcalc.org/

  18. ?? 30% Surfaces at ??0 F will be damp

  19. 30% Surfaces at 370 F will be damp

  20. ?? 30% Surfaces at ?? 0 F will be damp

  21. 30% Surfaces at 460 F will be damp

  22. ?? 45% Surfaces at ?? 0 F will be damp

  23. 45% Surfaces at 500 F will be damp

  24. ?? Surfaces at ?? 0 F will be damp

  25. Surfaces at 550 F will be damp

  26. ??

  27. Surfaces at 600 F will be damp

  28. Relative Humidity Monitor

  29. Cordless Temperature and Relative Humidity Logger

  30. Moisture Generation Rate Moisture Removal Rate Aim for 30% to 50 % RH

  31. Moisture Dynamics Relative Humidity: • Saturation of the air at a given temperature . . . • % of its water holding capacity 50% RH = the air is 1/2 full 90% RH = the air can only hold 10% more water vapor

  32. RELATIVE HUMIDITY FACT: Warm AirCan Hold More Moisture ThanCold Air Temperature Relative Humidity

  33. RELATIVE HUMIDITY Raise the air temperature and lower the relative humidity TEMP. R.H.

  34. RELATIVE HUMIDITY Lower the air temperature increases the relative humidity TEMP.R.H.

  35. Moisture Dynamics Dew Point: Temperature at which air becomes completely saturated = 100% Relative Humidity 100% full at this temperature

  36. a/c duct, cold pipes, etc. COLD OUTSIDE Areas of High RH Buildings have Micro-climates

  37. Dry Bulb = 72 0F Wet Bulb = 60 0F Relative Humidity = 50 % Dew Point Temp =52 0F

  38. 40 0F 70 0F 100 % R H ??? 100 % RH

  39. Outdoors Indoors 40 0F 70 0F 100 % RH 35 % R H

  40. a/c duct, cold pipes, etc. COLD OUTSIDE Areas of High RH Buildings have Micro-climates

  41. Moisture + Asbestos = Double Trouble

  42. single pane glass indicates high moisture levels

  43. Ventilation Exhaust Fans Breathing Shower Repair Plants Cooking Cleaning Laundry Leaks Dishes, etc.

  44. 1,500 ft sq house 700 F indoor temp 85 % outdoor RH Ventilation (AC/h)VS Indoor Relative Humidity (%) .35 AC/h 300F outside temp typical moisture load Indoor Relative Humidity (%) Ventilation: Air Chances per Hour (AC/h) based on G. Tsongas

  45. 1,500 ft sq house 700 F indoor temp 85 % outdoor RH Ventilation (AC/h)VS Indoor Relative Humidity (%) .35 AC/h 500 F outside temp typical moisture load Indoor Relative Humidity (%) Ventilation: Air Chances per Hour (AC/h) based on G. Tsongas