Heating, ventilation and air conditioning equipment

News and Updates

A House Ahead of Its Time

November 4, 2024

A decade in, NIST’s superefficient house continues to generate results and advance building science.

University, NIST Researchers Create Residential Building Models to Evaluate Fairness of Electricity Tariffs

January 1, 2024

The increased adoption of energy technologies like smart meters, solar panels, and battery storage has led to a rise in electricity pricing plans with costs

University, NIST Researchers Develop Strategy for Cutting Home HVAC Electricity Costs

June 1, 2023

To help reduce electricity consumption and its costs, university and NIST researchers proposed a strategy for controlling residential heating, ventilation, and

Projects and Programs

Automated Fault Detection and Diagnostics for the Mechanical Services in Commercial Buildings

Ongoing

Objective To put forward a new and practical measurement science whose “instruments” are realized commercially as a marketplace of highly effective, automated fault detection and diagnostic (AFDD) software products and services. These will employ data analytics and artificial intelligence to

Phase-Change Material Thermal Energy Storage in HVAC&R Systems for Utility Load Balancing

Ongoing

Objective To facilitate the integration of phase-change materials (PCM) with HVAC&R equipment to enable cost-effective and efficient thermal energy storage for load shifting and stabilization of the electrical grid as well as cost savings for electricity rate payers. Technical Idea As found in

NIST researcher setting up air cleaner experiments in large stainless steel environmental chamber

Contaminant Control in High-Performance Buildings

Ongoing

Objective To better understand how strategies to achieve resilient buildings will impact chemical reactions, rates, and concentrations of high-priority indoor air contaminants. To develop test methods and building control strategies to reduce chemical levels in low-energy buildings, and to enable

Next Generation Refrigerants for High-Efficiency HVAC&R Equipment

OBJECTIVE: To develop heat transfer, flammability, and system performance information that will assist in the selection and implementation of the best replacements for existing legacy refrigerants that will be phased down per the Kigali agreement. TECHNICAL IDEA: The existing HFC refrigerants will

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

A House Ahead of Its Time

University, NIST Researchers Create Residential Building Models to Evaluate Fairness of Electricity Tariffs

University, NIST Researchers Develop Strategy for Cutting Home HVAC Electricity Costs

Projects and Programs

Automated Fault Detection and Diagnostics for the Mechanical Services in Commercial Buildings

Phase-Change Material Thermal Energy Storage in HVAC&R Systems for Utility Load Balancing

Contaminant Control in High-Performance Buildings

Next Generation Refrigerants for High-Efficiency HVAC&R Equipment

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