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Objective

Objective. Revie the Cooling Cycle Learn about air distribution systems Define Building Zones Solve part of HW3. Zones In building. How to define the zone in building Based on cooling/heating load requirement Based on ventilation requirement Based on use of buildings

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Objective

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  1. Objective • Revie the Cooling Cycle • Learn about air distribution systems • Define Building Zones • Solve part of HW3

  2. Zones In building • How to define the zone in building • Based on cooling/heating load requirement • Based on ventilation requirement • Based on use of buildings – different apartments deferent zones

  3. Air Handling Units (AHU) Control of air Systems • Provide conditioned air • Heating, cooling, humidification, dehumidification • Ventilation • Provide fresh air, remove contaminated air

  4. Roof top AHU fresh air filter mixing Fan air from building to building Evaporator Gas/Electric Heater Air Handling Unit (AHU) AHU AHU schematic Exhaust From room Return fan flow control dampers Supply fan Compressorand Condenser Fresh air To room Outdoor air hotwater coolwater

  5. Air Handling Units (AHS) Equipment For AHU: • Fans • Cooling and heating coils • Combustion heat exchangers • Filtration • Dampers, controls, mixing valves • Humidification: steam/spray • Dehumidification: cooling coil/desiccant • Noise control

  6. Control of air Systems • Vary temperature, constant flow • Constant temperature, vary flow • Vary temperature, vary flow

  7. Constant Temperature, Variable Volume • On-off systems • Residential and small commercial • Vary volume by turning system on and off

  8. Constant Air Volume • Single zone constant air volume • Fan always runs • Vary temperature of air in response to space thermostat • Single zone constant air volume with reheat • Often used for precise humidity control • Multizone constant air volume with reheat • Good humidity control, flexible • Not very efficient

  9. 55°F 62°F 55°F Require less cooling Multizone constant air volume with reheat

  10. Variable Air Volume • Single zone VAV • Varies air flow based on room thermostat • Multizone VAV • Central chilled air supply • Zone thermostats control flow to each zone • Can also use reheat • Still need to provide adequate air flow for ventilation and for comfort • Smaller energy penalty than CAV

  11. VAV terminal

  12. 55°F 55°F 55°F Vary the flow Multizone VAV

  13. Reading Assignment Tao and Janis Chapter 3 Chapter 6 (from 6.1 to 6.7)

  14. Homework Assignment 4 Table 1 Results of cooling load calculation and required amount of fresh air for ventilation

  15. Homework Assignment 3 • Supply air 55°F • Recirculation air 76°F • Fresh air (Dallas, TX) DBT=102°F

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