06_-_Chapter_07_-_Part_2_Energy___Atmosphere

06_-_Chapter_07_-_Part_2_Energy___Atmosphere - Chapter 7...

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Unformatted text preview: Chapter 7 Energy & Atmosphere Part II Brother Burr Active Mechanical Systems Active Mechanical Systems Decrease pressure in ductwork. Increase duct size - Reduces duct pressure drop and fan speed. Keep ducts straight and simple Active Mechanical Systems Traditional Ventilation Method: Dilution Method- New air blows into the room and dilutes old air. Clean, cool air blows in from the ceiling Hot, dirty air is mixed in with clean air. Diluted air (both new and old) are pulled from the room. Is this traditional method inefficient? Active Mechanical Systems Displacement Ventilation Method- Slowly pushing conditioned air into occupied space from below with minimum mixing. Clean, cool air blows in from the floor Hot, dirty air is pushed up as cool air warms. Hot, dirty air is pulled from the room. This is more efficient, and provides higher air quality Active Mechanical Systems Displacement Ventilation Dilution Ventilation Displacement Ventilation Clean, cool air blows from a raised-floor system Clean, cool air blows in from air diffuser in ceiling Active Mechanical Systems Air supplied at low velocity. Provides Cleaner air. Air supply does not have to be as cold. Air supplied at high velocity. Requires more air changes per hour. Dilution Ventilation Displacement Ventilation Active Mechanical Systems Economizers Senses when outdoor air is cool enough and blows it into the building to cool the interior. Active Mechanical Systems Energy Recovery Ventilators (ERVs) collects energy from already conditioned inside air and pre-cools or pre-heats incoming outside air. Energy Recover Ventilator (ERV) Active Mechanical Systems Carbon Dioxide Sensors System only provides fresh air when it senses people are in the room....
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This note was uploaded on 01/11/2012 for the course CM 455 taught by Professor Kevinburr during the Winter '12 term at BYU.

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06_-_Chapter_07_-_Part_2_Energy___Atmosphere - Chapter 7...

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