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Air temperature

Air temperature. Relative humidity. Air movement. +100. - 5. Air quality (IAQ). Surface temperatures. 75 degrees. Acoustics. Lighting quality quantity. 65 degrees. Security. Building Envelop -The Third Skin

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Air temperature

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  1. Air temperature Relative humidity Air movement +100 - 5 Air quality (IAQ) Surface temperatures 75 degrees Acoustics • Lighting • quality • quantity 65 degrees Security Building Envelop -The Third Skin The 3rd. skin moderates the differences between the natural environment and the built environment

  2. The combined affects ofenvironmental conditions on comfort • Air temperature • Relative humidity • Air movement • Surface radiation

  3. The psychrometric chart Charts the combined affects of air temperature and moisture content Change in quantity of water in the air Change in quantity of water in the air Dry Bulb Temperature Reading

  4. Psychrometric Chart Definition of Relative Humidity The amount of moisture in the air expressed as a percentage of the maximum amount of moisture the air can hold at the given temperature. Example: at dry bulb temp. of 77 and wet bulb temp. of 63, the air is holding 50% of it’s maximum capacity at 77 degrees. Enter wet bulb reading 50% RH Enter dry bulb reading

  5. Adding moisture cooling warming drying

  6. Energy efficient zones Winter: higher humidity off-sets lower furnace thermostat setting Summer: lower humidity off-sets higher AC thermostat setting Adding moisture Winter Cool & Humid warming cooling Warm & Dry drying Summer

  7. The saturation curve Air is 100% saturated with moisture and condensation begins 50% RH

  8. What if cooling continues ? Air is 100% saturated with moisture and continues to cool 50% RH Moisture removed by condensation

  9. Air is 100% saturated with moisture and continues to cool 50% RH Moisture removed by condensation Same air is reheated to 70 degrees and no moisture added – RH of the room goes down (dryer)

  10. Chart Exercises What is the RH in the classroom? Dry bulb ________ Wet bulb _________ RH = _________ Change in quantity of water in the air Change in quantity of water in the air Dry Bulb Temperature Reading

  11. Chart Exercises Based on the current room RH, how cool would the walls need to get to start noticing condensation ? Dry bulb ________ Wet bulb _________ RH = _________ Change in quantity of water in the air Change in quantity of water in the air Dry Bulb Temperature Reading

  12. Chart Exercises Assume the room is at pt. “A” when class begin and we are comfortable, which direction would room condition tend to move toward as a response to our presents ? Mechanically: (Summer) we need to (add or remove heat) we need to (add or remove moisture) C B D A - Room starts out here E

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