iaq models of representative u s homes r esidential exposure analysis with contam n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
IAQ Models of Representative U.S. Homes R esidential exposure analysis with CONTAM PowerPoint Presentation
Download Presentation
IAQ Models of Representative U.S. Homes R esidential exposure analysis with CONTAM

Loading in 2 Seconds...

play fullscreen
1 / 11

IAQ Models of Representative U.S. Homes R esidential exposure analysis with CONTAM - PowerPoint PPT Presentation


  • 130 Views
  • Uploaded on

IAQ Models of Representative U.S. Homes R esidential exposure analysis with CONTAM. Andrew Persily National Institute of Standards and Technology Gaithersburg, MD andyp@nist.gov , 301 975-6418 NSF /UL 440 Environments & Products Teleconference May 24, 2012. Topics for Today.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'IAQ Models of Representative U.S. Homes R esidential exposure analysis with CONTAM' - oral


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
iaq models of representative u s homes r esidential exposure analysis with contam

IAQ Models of Representative U.S. HomesResidential exposure analysis with CONTAM

Andrew Persily

National Institute of Standards and Technology

Gaithersburg, MD

andyp@nist.gov, 301 975-6418

NSF/UL 440 Environments & Products Teleconference

May 24, 2012

topics for today
Topics for Today
  • IAQ modeling with CONTAM
  • “Suite of homes” CONTAM models of US dwellings
  • Issues in modeling exposure
building airflow and contaminant transport modeling
Building Airflow and Contaminant Transport Modeling

Macroscopic/Multizone

Network airflow analysis

Each zone: 1 node, 1 reference pressure, uniform temperature & concentration

e.g., CONTAM

Microscopic/CFD

Details of airflow and contaminant concentrations in a space

e.g., FDS, FLUENT, CFD0

contamw inputs outputs
CONTAMW Inputs & Outputs
  • Building and System Description
  • Building Zone Configuration
  • Building Leakage Characteristics
  • HVAC Airflow Rates
  • Duct Systems
  • Filter Efficiencies
  • Contaminant Information
  • Chemical Reaction Data
  • Contaminant Sink Characteristics
  • Contaminant Source Strength
  • Occupancy Schedules
  • Environmental Factors
  • Wind Speed and Direction
  • Wind Pressure Coefficient
  • Indoor/Outdoor Temp
  • Outdoor Contaminants

Filtration

Steady State Simulation

Scheduled Flows, Sources etc.

Transient Simulations up to One Year

First Order Chemical Reactions

Data Libraries

Exposure Levels

Infiltration Rates

Interzonal Airflows

Pressure Drops across Openings

Contaminant Concentrations

nist suite of homes
NIST “Suite of Homes”

HUD-funded effort to define a representative collection of houses based on U.S. building surveys (e.g., Census, DOE)

  • 209 dwellings that represent 80 % of the U.S. housing stock

Floor plans and CONTAM models available for download

suite of homes
Suite of Homes

Persily et al. 2006. A Collection of Homes to Represent

the U.S. Housing Stock, NIST report NISTIR 7330.

Report, CONTAM files and floor plans: http://www.bfrl.nist.gov/IAQanalysis/case%20studies/cwcase_11.htm

application suite of homes
Application “Suite of Homes”

First statistically representative distribution of ventilation rates in U.S. homes

CONTAM models are being used for IAQ and exposure studies

Advantages: Established and documented; public domain; generates distribution instead of single value

Indoor CO exposure from emergency generators

Persily et al. 2010. Indoor Air. 20: 473-485.

issues in modeling exposure
Issues in modeling exposure

BASIC QUESTIONS

How many dwellings: Which and why?

Simulation duration: 24 h? Annual?

Occupants: Number? Schedule?

Contaminants: How many?

INPUTS

Weather conditions: How many?

Building tightness: Covered in suite models

Mechanical ventilation: Any? How much?

Impose constant air change rate or calculate from leakage/weather?

Source strengths: Source areas

Removal mechanisms: Surface sorption? Air cleaning?

DATA MANAGEMENT AND ANALYSIS