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IEQ Performance Evaluation (1) - Coggle Diagram
IEQ Performance Evaluation (1)
For general evaluation, steps:
Identify issues needing correction and take corrective actions
Remeasure performance
Conduct performance comparison to past performance (self-reference) and baseline databases (peer buildings)
Compare new performance to past performance
Conduct performance evaluation, measurement, and anaylsis
Report results
Collect building data
Thermal Comfort Evaluation Prcedure
Complaint Logs
It is for evidence of occupant dissatisfaction and its causes
Trends in complaint rates overtime may indicate occupant reactions to changes in building operation and performance
Do not provide a systematic evaluation of a building's IEQ (it is required to be augmented with surveys and database analysis)
Occupant Survey
Application of occupant survey:
It is used to assess satisfaction of IEQ (including overall thermal comfort and the impact of thermal environment on self-reported job performance)
The most effective survey: satisfaction assessment with a full range of environmental attributes (e.g., thermal comfort, IAQ, lighting, acoustics, etc.)
Surveys are determined in 2 ways:
Web-based
administered remotely
Paper-based
administered personally
Occupant's survey sample and questions:
40% response rate is sufficient to evaluate the occupancy satisfaction
Survey is open for a specific period of time (e.g., a week or two weeks) during which occupants are free to take it
Survey need to be introduced to the building occupants to ensure a high degree of participation
Questions must be carefully crafted & tested as well as be compatible with benchmark data from other similar buildings
Occupant's survey involved:
Requesting comments from occupants (especially for direct comments from occupants captured by building operations/managements)
Satisfaction surveys use 5 or 7 points scales. These indicate the extent of agreement or disagreement with a given statement
Any dissatisfied response lead to secondary pages with questions:
Local sources of thermal discomfort (e.g., drafts, diffusers)
Times when discomfort occurs (e.g., AM/PM, periods of solar gain)
Issues with environmental control
Open-ended questions
Walkthrough Inspection
Entails a physical visit to collect actual data about current situation
Examines the current situation of the facility condition and HVAC system performance
Sometimes, conducts measurement:
check airflow using temperature and humidity gauge and a smoke pencil
check lighting parameter using light instruments
Conducted with predetermined checklist
Field Observations and Instrumentations
Temperature
Air temperature
Portable thermometer with external elements on wire
Shielded from radiation
Radiant temperature
Globe thermometer
Pyranometer, for spot measurement of solar gain into occupied space
IR cameras, to visually map hot and cold surfaces
Surface temperature
IR gun or Thermocouples
Humidity
Electronic psychrometer / Sling psychrometer
Air movement
Handheld anemometer
Space configuration
Section depth from fenestrations
Window-to-wall area
Operable windows
Human activity in each space
HVAC system and its operation
Private and open-plan areas
Preliminary Assessment
[same with IAQ Evaluation Procedure]