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CHIMP is the Clearing House for Infiltration Modeling Purposes. This image shows the word CHIMP inside a building, with arrows penetrating the walls to represent infiltration.Credit:
          
  Lisa Ng/NISTWhat is CHIMP?

CHIMP is the Clearing House for Infiltration Modeling Purposes, which provides a central resource where users can obtain information, data, and tools to facilitate the modeling of infiltration in a variety of analysis tools (e.g., CONTAM, EnergyPlus, etc). Since 2012, NIST has been developing models, datasets, and tools for estimating the effects of infiltration on heating, ventilating, and air-conditioning (HVAC) related energy use. CHIMP is the one-stop shop for your infiltration modeling needs and is updated when new work is released. To get notified of updates to this page, please email lisa.ng [at] nist.gov(lisa[dot]ng[at]nist[dot]gov).

What can I find on CHIMP?

CHIMP is repository of major infiltration-related products developed by the NIST IAQ and Ventilation Group. These products are:

NIST infiltration correlations: These inputs can be used in EnergyPlus (and other building energy simulation software) to account for infiltration in energy simulations.
	OpenStudio Measure: This measure allows the OpenStudio user to seamlessly incorporate the NIST infiltration correlations into their project.
	Energy Savings and Moisture Transfer Calculator: An online diagnostic tool to evaluate the effects of airtightening on HVAC-related energy use and moisture transfer into buildings (developed with Air Barrier Association of America, US-China Clean Energy Research Center for Building Energy Efficiency, and Oak Ridge National Laboratory).
	CONTAM Results Export Tool: An online tool that converts CONTAM simulations results (i.e., binary result files) and converts them to tab-delimited text files that can be read using a spreadsheet program. As part of this tool, users can export whole-building or zone-specific air change rates for use in EnergyPlus.
	CONTAM video tutorials and airflow 101: Here are a collection of videos that show users how to use to CONTAM and an illustrated video on building airflow physics, which includes what is infiltration.
	*Future:*Commercial Building Airtightness DatabaseWhat is infiltration?

Infiltration is the unintended and uncontrolled air leaking into a building through intentional and unintentional openings. Due to mass balance, air is also leaving a building through intentional and unintentional openings (exfilftration) [read more].
  Indoor air quality

    
    Contacts
      
        

Lisa Ng
    
      
  lisa.ng@nist.gov
  (301) 975-4853

Created September 28, 2023, Updated October 4, 2023
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