Heating, ventilation and air conditioning equipment

News and Updates

A white, square plastic CO2 meter sits on a table in a restaurant setting, reading 621 ppm.

NIST’s Indoor CO₂ Tool Can Help Assess Ventilation and Indoor Air Quality

July 19, 2022

The free tool calculates target CO2 levels based on the user’s desired ventilation rate and information about a building and its occupants.

A man in safety goggles crouches at the back of an open air-conditioning unit, looking at a handheld tester.

Spotlight: Overhauling the Refrigeration Industry to Fight Global Warming

June 26, 2022

NIST researchers are tackling the question of alternative refrigerant fluids.

Streamlined NIST Tool Could Help Homeowners, Renters Reduce Airborne Exposure to COVID

November 24, 2021

COVID-19 is still circulating in the U.S. and may once again gain traction as families and friends gather indoors over the holidays. There are several measures

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

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

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

Software

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

Heating, ventilation and air conditioning equipment

News and Updates

NIST’s Indoor CO₂ Tool Can Help Assess Ventilation and Indoor Air Quality

Spotlight: Overhauling the Refrigeration Industry to Fight Global Warming

Streamlined NIST Tool Could Help Homeowners, Renters Reduce Airborne Exposure to COVID

Publications

Screening for Next Generation Refrigerants

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

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

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

Software

HVAC-Cx Building HVAC Systems Commissioning Tool

The NIST Data Alignment Tool

HVAC SIMulation PLUS other systems (HVACSIM+)

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