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ACSIM; Simulation Model of an Air Conditioner

Published by National Institute of Standards and Technology | National Institute of Standards and Technology | Catalog Last Checked: September 02, 2026 at 07:19 PM | Dataset Last Updated: January 06, 2026
ACSIM is a simulation tool for single-stage air conditioning systems comprising a compressor, finned-tube evaporator and condenser, thermostatic and electronic expansion valves, and interconnecting tubing. The program incorporates evaporator and condenser models from EVAP-COND, a stand-alone simulation tool developed by NIST for air-to-refrigerant heat exchangers ( https://www.nist.gov/services-resources/software/evap-cond-version-50). Consistent with EVAP-COND, ACSIM uses refrigerant thermophysical properties based on the NIST Standard Reference Data 23; NIST Reference Fluid Thermodynamic and Transport Properties Database (REFPROP): Version 10.0 (http://www.nist.gov/srd/nist23.cfm) and uses refrigerant property look-up tables to facilitate fast simulations. ACSIM installation module does not provide REFPROP fluid files, which need to be loaded by the user after ACSIM installation.

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Complete Metadata
@type dcat:Dataset
accessLevel public
accrualPeriodicity irregular
bureauCode 
[
  "006:55"
]
contactPoint 
{
  "fn": "Piotr A. Domanski",
  "hasEmail": "mailto:piotr.domanski@nist.gov"
}
description ACSIM is a simulation tool for single-stage air conditioning systems comprising a compressor, finned-tube evaporator and condenser, thermostatic and electronic expansion valves, and interconnecting tubing. The program incorporates evaporator and condenser models from EVAP-COND, a stand-alone simulation tool developed by NIST for air-to-refrigerant heat exchangers ( https://www.nist.gov/services-resources/software/evap-cond-version-50). Consistent with EVAP-COND, ACSIM uses refrigerant thermophysical properties based on the NIST Standard Reference Data 23; NIST Reference Fluid Thermodynamic and Transport Properties Database (REFPROP): Version 10.0 (http://www.nist.gov/srd/nist23.cfm) and uses refrigerant property look-up tables to facilitate fast simulations. ACSIM installation module does not provide REFPROP fluid files, which need to be loaded by the user after ACSIM installation.
distribution 
[
  {
    "title": "Gateway for Registered Data Access",
    "accessURL": "https://data.nist.gov/od/rp?@id=ark:/88434/mds2-3946",
    "description": "This page provides a registration form that must be completed before downloading the data."
  },
  {
    "title": "Instruction Pages",
    "format": "A pdf file",
    "mediaType": "application/pdf",
    "description": "A tutorial on using ACSIM",
    "downloadURL": "https://data.nist.gov/od/ds/mds2-3946/Instruction_Pages_1.0.pdf"
  },
  {
    "title": "TableGen2",
    "format": "A zip file",
    "mediaType": "application/x-zip-compressed",
    "description": "An installation module for the Look-up Table Generator (TableGen2). TableGen2 generates tables with thermophysical properties of refrigerants and refrigerant blends for use in ACSIM. TableGen2 requires the user to provide REFPROP-compatible fluid files.",
    "downloadURL": "https://data.nist.gov/od/ds/mds2-3946/TableGen2.zip"
  },
  {
    "title": "ACSIM README File",
    "format": "text file",
    "mediaType": "text/plain",
    "description": "General description of ACSIM",
    "downloadURL": "https://data.nist.gov/od/ds/mds2-3946/3946_README_2026-02-26.txt"
  },
  {
    "title": "ACSIM_1.0_Setup.zip",
    "format": "Zip file",
    "mediaType": "application/x-zip-compressed",
    "description": "Installation module for ACSIM Version 1.0",
    "downloadURL": "https://data.nist.gov/od/ds/mds2-3946/ACSIM_1.0_Setup.zip"
  },
  {
    "title": "Instructions for look-up table generator TableGen2",
    "format": "A pdf file",
    "mediaType": "application/pdf",
    "description": "Instructions for TableGen2 to generate look-up tables with refrigerant thermophysical properties and implement these tables in EVAP-COND and ACSIM.",
    "downloadURL": "https://data.nist.gov/od/ds/mds2-3946/TableGen2_Info.pdf"
  },
  {
    "title": "Link to ACSIM download page",
    "format": "txt file",
    "mediaType": "text/plain",
    "description": "Link to ACSIM download page",
    "downloadURL": "https://data.nist.gov/od/ds/mds2-3946/Link%20to%20ACSIM%20Download%20Page.txt"
  }
]
identifier ark:/88434/mds2-3946
issued 2026-02-27
keyword 
[
  "air conditioner",
  "heat exchanger",
  "refrigeration",
  "thermodynamics"
]
landingPage https://www.nist.gov/services-resources/software/acsim
language 
[
  "en"
]
license https://www.nist.gov/open/license
modified 2026-01-06 00:00:00
programCode 
[
  "006:045"
]
publisher 
{
  "name": "National Institute of Standards and Technology",
  "@type": "org:Organization"
}
rights Purchase is not required for downloading but the user needs to obtain and provide REFPROP-compatible files with refrigerant constants. Users must complete registration form to download data.
theme 
[
  "Buildings and Construction:Air conditioning and heating equipment"
]
title ACSIM; Simulation Model of an Air Conditioner

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