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"Drop-in Performance of Low GWP Refrigerants in a Heat Pump System for Residential"

Presented June 2012 at the International Refrigeration and Air Conditioning Conference at Purdue by Atharva Barve1 and Lorenzo Cremaschi, School of Mechanical and Aerospace Engineering, Oklahoma State University.

This paper focuses on an experimental comparison of the drop-in energy performance and capacities of refrigerants R32 and R1234yf in a R410A heat pump split system for ducted HVAC in residential applications.

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"Performance and Capacity Comparison of Two New LGWP Refrigerants Alternative to R410A in Residential Air Conditioning Applications"

Presented June 2012 at the International Refrigeration and Air Conditioning Conference at Purdue by Atharva Barve1 and Lorenzo Cremaschi, School of Mechanical and Aerospace Engineering, Oklahoma State University.

This paper presents a study that breaks new ground on LGWP developmental refrigerants and focuses on heat pump systems for residential applications.

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"Performance of Novel Low GWP Refrigerants for AC and Heating"

July 2011 proceedings of the International Conference on Air-Conditioning & Refrigeration, presented  by Thomas J. Leck, Ph.D., Younghwan Ko, and Jongchul Ha.
The low GWP fluid, HFO-1234yf, and two blends based on that new molecule, were tested as a "drop-in" in a high performance R-410A AC/Heat Pump system, results of which are reported here.

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Property and Performance Measurements of Low GWP Fluids for AC and Heat Pump Applications

Presented August 22, 2011, by Thomas J. Leck, Ph.D., at the IIR/ICR Conference in Prague.

Novel refrigerant fluids have been developed and are being evaluated for use in air conditioning and heat pumping. The fluids discussed in this paper are based on the low GWP molecule HFO-1234yf, or 3,3,3,2-tetrafluoropropene. These candidate fluids have superior environmental properties, as compared to the widely used commercial incumbent AC and heat pump working fluids, and can reduce the net carbon foot print that results from indoor climate control.
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"Experimental Study of R-134a Alternative in a Supermarket Refrigeration System"

Presented by Barbara Minor, Ph.D., at  the ASHRAE 2012 annual meeting in Montreal, Canada.
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Patent Infringement

DuPont and Star Refrigeration Glasgow, UK, announced that they have filed legal action in Italy alleging R-422D patent infringement against a major refrigerant reseller.
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HFO-1234yf Performance in a Beverage Cooler

Presented by Barbara Minor, Ph.D., Carlos Montoya, and Francisco Sandoval Kasa at the International Refrigeration and Air Conditioning Conference at Purdue.

HFO-1234yf is a low global warming potential refrigerant that has been selected as the preferred option to replace R-134a in automotive air conditioning systems. It was primarily chosen over carbon dioxide due to its higher energy efficiency and improved Life Cycle Climate Performance (LCCP) (SAE, 2009 and Little, 2002). It is also a close thermodynamic match to R-134a which results in fewer system modifications and potential for global implementation in auto a/c systems.
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A Non-Flammable, Reduced GWP, HFC-134a Replacement in Centrifugal Chillers: DR-11

Presented at the International Refrigeration and Air Conditioning Conference by Kostas Kontomaris, Ph.D., Thomas J. Leck, Ph.D., and J. Hughes, DuPont

Air conditioning in large buildings is often provided by centrifugal chillers using HFC-134a. Efforts to mitigate climate change are motivating the identification of HFC replacements with low GWPs. HFO-1234yf, with a GWP100=4, has been found promising as an HFC-134a replacement in centrifugal chillers.
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New High Performance, Low GWP Refrigerants for Stationary AC and Refrigeration

Presented at the International Refrigeration and Air Conditioning Conference at Purdue by Thomas J. Leck, Ph.D., DuPont.

In response to concerns about global climate change, and in consideration of probable legislation that may impact the production and use of refrigerants with high global warming potential, a set of new refrigerant candidates has been developed for evaluation.
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Low GWP Chiller Refrigerants: Weighing the Tradeoffs

Presented by Konstantinos (Kostas) Kontomaris,Ph.D.

This paper introduces a new developmental refrigerant, DR-2, as a potential replacement for HCFC-123. DR-2 is a hydrofluoro-olefin-based fluid with an ozone depletion potential of zero and a global warming potential lower than 10. Key thermo-physical properties of the new refrigerant were determined and its thermodynamic performance in a typical chiller cycle was evaluated through computational modeling.
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Low GWP Refrigerants for Air Conditioning of Large Buildings

Presented by Kostas Kontomaris, Ph.D., Thomas J. Leck, Ph.D., and J. Hughes at CLIMA 2010 in Antalya, Turkey.

This paper explores how a new generation of refrigerants with low Global Warming Potentials (GWP) based on Hydro-Fluoro-Olefins (HFOs) may be used in centrifugal chillers to meet building air conditioning needs affordably, safely and with reduced environmental impact.
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Development and Evaluation of High Performance, Low GWP Refrigerants for Stationary AC and Refrigeration

Presented by Thomas J. Leck, Ph.D., at the 2010 NextACR Symposium in Tokyo, Japan.

The development of reduced GWP refrigerant gases to use in new and existing refrigeration and air conditioning systems is described. The design trade-offs and implications with regards to system performance with these new refrigerants, and regulatory scenarios are discussed.
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MAC Presentations on HFO-1234yf