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May, HVACSIM + Building Systems and Equipment Simulation Program Users Guide, NBSIR 85-3243, NIST, Sept.1985. Clark, D.R., HVACSIM + Building Systems and Equipment Simulation Program Reference Manual, NBSIR 84-2996, NIST, Jan.Kelly, An Overview of HVACSIM +, A Dynamic Building/HVAC/Control Systems Simulation Program, Proceedings of the 1st Annual Building Energy Simulation Conf., Seattle, WA, August 21-22, 1985. Galler, M.A., Users Guide to the HVACSIM+ Configuration Tool, NIST TN 2110, NIST, September 2020.Since the first distribution of the program to the public, a number of modifications have been made including the addition of the component models developed for the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) 825 project. Since then, the HVACSIM+ computer program package and manuals have been distributed to researchers, students, and consultants in more than 40 countries around the world.

The first version of HVACSIM+, which stands for “HVAC SIMulation PLUS other systems”, was introduced by National Institute of Standards and Technology (NIST) in 1985 as a computer simulation tool to simulate entire building systems.
