Radiant Ceiling Cooling - PowerPoint PPT Presentation

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Title:

Radiant Ceiling Cooling

Description:

Maintain the space within the thermal comfort. Remove/dilute air contaminants ... Exhaust With Make-Up Air. Mixed Supply Air. Fixed Dampers. Modulating Dampers ... – PowerPoint PPT presentation

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Provided by: reidcr6
Learn more at: http://www.dspratt-associates.com
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Tags: ceiling | cooling | make | radiant | up

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Transcript and Presenter's Notes

Title: Radiant Ceiling Cooling


1
Ventilation Effectiveness Indoor Air Quality
Douglas Spratt February 2001
2
The Indoor Environment
3
The Purpose of HVAC Systems
4
HVAC Systems
  • Maintain the space within the thermal comfort
  • Remove/dilute air contaminants

5
Ventilation- Removes Emissions
6
Ventilation Approaches
  • Natural
  • Displacement
  • Mechanical

7
Natural Ventilation
  • Advantages - Low 1st Cost - Low
    Energy - Low Maintenance - Natural - G
    reater occupant acceptance

8
Natural Ventilation
  • Forces - Buoyancy - Wind

9
Effect on Health Symptoms
10
Impact on Work Environment
11
Natural Ventilation
  • Limitations
  • Limited to Low Occupant Densities
  • Limited to Mild Climates
  • Limited Distribution

12
Natural Ventilation
  • Considerations
  • Security
  • Outdoor air quality
  • Wind gusts
  • Noise
  • Bugs

13
Displacement Ventilation
14
Displacement Ventilation
  • Continuously purges air pollutants
  • Typical features
  • - De-couples ventilation
  • - Uses natural buoyancy forces
  • - Low noise
  • - No drafts
  • - Fresh air breathing zone

15
Air Distribution Effectiveness
Source ASHRAE 62N
16
(No Transcript)
17
Mechanical Ventilation
  • Practical Help
  • Watch for short circuiting
  • Min. O/A settings for VAV Systems
  • Ensure continuous fan operation

18
Mechanical Ventilation
  • Methods
  • Exhaust Fan
  • Exhaust With Make-Up Air
  • Mixed Supply Air
  • Fixed Dampers
  • Modulating Dampers

19
The Economizer Section
20
Example
20 ton Roof-top unit 9,000 cfm supply 1,000 cfm
toilet exhaust 9,000 ft2 floor space Office space
with 150 ft2/person
21
Ignoring Infiltration
1,200 cfm
22
Ventilation Summary
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