Heating, ventilation and air conditioning equipment

News and Updates

A man in brown camouflage clothing, including baseball cap, gloves and ear protection, uses a long pole to clean the inside of an HVAC unit outside a military tent.

NIST Study Identifies Chemical Blends as Possible Alternative Refrigerants

May 29, 2019

More than a dozen chemical blends could serve as alternative refrigerants that won’t heat the atmosphere as much as today’s refrigerants do, or catch fire

Gas vs. Electric? NIST Says Fuel Choice Affects Efforts to Achieve Low-Energy and Low-Impact Homes

May 23, 2019

If you want to make your home as energy-efficient and green as possible, should you use gas or electric for your heating and cooling needs? Gas is the more eco

Publications

Screening for Next Generation Refrigerants

August 26, 2019

Author(s)

Piotr A. Domanski

The availability of refrigerants having low global warming potential (GWP) varies between different applications as it is demonstrated by four system types

Optimization of Air-to-Refrigerant Evaporator with Low-GWP Refrigerants

June 23, 2019

Author(s)

Piotr A. Domanski

An analytical evaluation of the performance of low-GWP refrigerants in a finned-tube evaporator used for residential cooling applications will be presented. The

CYCLE_D: NIST Vapor Compression Cycle Design Program, Version 6.0; User's Guide

November 19, 2018

Author(s)

Piotr A. Domanski, J S. Brown, Eric W. Lemmon

The CYCLE_D package simulates vapor compression refrigeration cycles that use pure refrigerants or blends of refrigerants. The model can simulate a basic

REFLEAK: NIST Leak/Recharge Simulation Model for Refrigerant Blends Version 5.1; User's Guide

November 19, 2018

Author(s)

Piotr A. Domanski, J S. Brown

As alternatives to refrigerants with a high global warming potential, blends of two or more refrigerants are being utilized as working fluids in heat-pump, air

Software

HVAC SIMulation PLUS other systems (HVACSIM+)

May 11, 2021

The first version of HVACSIM+, which stands for “HVAC SIMulation PLUS other systems”, was introduced by National Institute of Standards and Technology (NIST) in

CYCLE_D-HX: NIST Vapor Compression Cycle Model Accounting for Refrigerant Thermodynamic and Transport Properties Version 2.0

January 10, 2021

CYCLE_D-HX simulates the performance of single-compound refrigerants and refrigerant blends in subcritical vapor-compression refrigeration cycles. The basic

The NIST Data Alignment Tool

June 18, 2019

The Data Alignment Tool (DAT) was built to assist with the analysis of data used in testing fault detection and diagnostics (FDD) tools and building

HVAC-Cx Building HVAC Systems Commissioning Tool

December 14, 2017

HVAC-Cx is a semi-automated commissioning software tool designed to facilitate performance analysis for heating, ventilating, and air conditioning (HVAC)