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HVAC&R Equipment Performance Group

The HVAC&R Equipment Performance Group expands the scientific knowledge of air-conditioning, heat pumping, and refrigeration technology. The Group's focus is to improve the energy efficiency of HVAC&R equipment, which is the predominant end-user of energy in buildings. The research activities include innovative and fundamental heat transfer measurements of refrigerants; experimental and analytical studies of systems and components; development of

The research activities encompass analytical and experimental studies of new-generation refrigerants; experimental and simulation investigations of space-conditioning systems in current and net-zero energy buildings; and research of novel cooling/refrigeration technologies.  The current projects include: 

  • Characterization of the performance potential of novel refrigerants
  • Development of test and predictive methods for characterization of flammability of mildly flammable single-component refrigerants and refrigerant blends
  • Fundamental two-phase heat transfer measurements for new generation single-component refrigerants and refrigerant blends
  • Development of automated fault detection and diagnostic methods for field-assembled air conditioners and heat pumps
  • Development of computational intelligence-based tools for optimization of component and system designs
  • System studies through laboratory measurements and computer simulations

The best-known contributions of the Group are those related to the research of environmentally-acceptable refrigerants, the development of advanced simulation tools, and the formulation of the SEER and HSPF performance descriptors for the test procedures of residential air conditioners and heat pumps.

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Projects and Programs

Fault Detection and Diagnostics for Air-Conditioners and Heat Pumps

Ongoing
Objective - Develop fault detection and diagnostic (FDD) methods and measurement tools to ensure air conditioners (ACs) and heat pumps (HPs) perform as designed throughout their lifetime and develop a testing and rating methodology to assess relative merits of different commercial FDD products. What

Flammability Metrics for New Low-GWP Refrigerants

Ongoing
Objective: To develop the capability to measure and predict the burning velocity of mixtures of low-Global Warming Potential (GWP) refrigerants to allow the ranking of the mixtures in terms of their flammability, to assist in the selection and implementation of the best replacements for high-GWP

Low-GWP Refrigerants for High-Efficiency HVAC&R Equipment

Ongoing
Objective - To develop heat transfer and system performance information that will assist in the selection and implementation of the best replacements for high-GWP hydrofluorocarbon (HFC). What is the new technical idea? Most of the currently used HFC refrigerants will be phased out or phased down

Space-Conditioning Options for Energy-Efficient Buildings

Ongoing
Objective: Develop and deploy the measurement science to support the development and implementation of the most efficient and cost-effective space-conditioning options for energy-efficient buildings. What is the new technical idea? (Tasks 1-4): The unique aspects of high-efficiency homes require new

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