Conference Agenda

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Session Overview
Session
Session 7: Working fluids - New fluids and fluid blends
Time:
Tuesday, 28/July/2020:
5:00pm - 6:20pm

Session Chair: Ahmed Kovacevic
Location: Main Conference Webinar Stream
This is the main Go to Webinar conference stream. It will broadcast the paper presentations, keynote presentations, short course and opening and closing sessions

Four papers will be presented. Click on the session title to see the full details.

Paper ID:1119

Paper ID:1218

Paper ID:1120

Paper ID:1118


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Presentations
5:00pm - 5:20pm

Characteristics of Blends Using Low GWP Molecules for Application in Centrifugal and Screw Compressor-based Chillers

Schultz, Kenneth John1; Kujak, Stephen Anthony2; Sorenson, Elyse Marie3

1Trane, La Crosse, Wisconsin, United States of America; 2Trane, La Crosse, Wisconsin, United States of America; 3Trane, La Crosse, Wisconsin, United States of America

This paper summarizes information on blends utilizing ultra-low GWP (<10) olefin-based refrigerants targeted to application in centrifugal and screw compressor-based water chillers. These types of chillers tend to use shell-and-tube heat exchangers that permit fractionation to occur when running with zeotropic blends. Fortunately, many of these blends form azeotropic mixtures, such as R513A, R514A, R515A/B, and R516A.

This paper provides a review of the thermodynamic interactions when blending various ultra-low GWP refrigerants suitable for use in vapor compression (e.g., HVAC&R) or expansion (e.g., ORC) applications. This includes molecules already in commercial use and those that have recently come to light. A summary of thermodynamic properties, thermodynamic cycle performance, heat transfer characteristics, flammability, stability, and toxicological properties are provided.



5:20pm - 5:40pm

Pushing The Envelope: Extending The Range And Performance Of R-744

Low, Robert Elliott

Koura Global (Mexichem), United Kingdom

Refrigerant R-744 is finding increasing favour as a non-flammable refrigerant in a range of cold-chain refrigeration and other applications. Its physical properties however constrain its application: its triple point of -57°C sets a lower practical operating limit, while the very high operating pressures and reduced energy efficiency in high ambient climates limit its attraction for air-conditioning applications. Koura Global has in development a range of hybrid R-744-fluorocarbon refrigerants which are non-flammable but which offer significantly improved energy efficiency, reduced operating pressure and extended operational temperature range compared to R-744, whilst also having low Global Warming Potentials. The paper will present a suitable thermodynamic model for these fluids and share property and performance test data on two selected applications: air-conditioning with fluids having GWP below 300; and refrigeration to achieve product temperatures below -60°C.



5:40pm - 6:00pm

Characteristics of Blends Using Ultra-Low GWP Molecules for Application in Positive Displacement Compressor-based Systems Operating at Higher Pressures

Schultz, Kenneth John1; Kujak, Stephen Anthony2; Sorenson, Elyse Marie3

1Trane, La Crosse, Wisconsin, United States of America; 2Trane, La Crosse, Wisconsin, United States of America; 3Trane, La Crosse, Wisconsin, United States of America

This paper summarizes information on higher (R404A/R22- to R410A/R32-like) pressure blends utilizing ultra-low GWP (<10) olefin-based refrigerants targeted to application in HVAC&R systems. This includes molecules already in commercial use (e.g. R1234yf) and those that have recently been brought forward (e.g. R13I1, R1123, and R1132a). In addition, potential future molecules suggested by McLinden et al. (2017) are reviewed (e.g. R1132(E)). A summary of thermodynamic properties and cycle performance, heat transfer characteristics, flammability, stability, and toxicological properties are provided.

McLinden, M. O. et al. Limited options for low-global-warming-potential refrigerants. Nat. Commun. 8, 14476 doi: 10.1038/ncomms14476 (2017).



6:00pm - 6:20pm

Review of Ultra-Low GWP Molecules – Thermodynamic Properties and Their Characteristics for Use in HVAC&R

Kujak, Stephen Anthony1; Schultz, Kenneth John2; Sorenson, Elyse Marie3

1Trane, La Crosse, Wisconsin, United States of America; 2Trane, La Crosse, Wisconsin, United States of America; 3Trane, La Crosse, Wisconsin, United States of America

This paper provides a review of current, proposed and potential future molecules with ultra-low GWP suitable for use as refrigerants in vapor compression (e.g., HVAC&R) or expansion (e.g., ORC) applications. A summary of thermodynamic properties and cycle performance, along with flammability, stability, and toxicological properties is provided for a variety of single molecules (in pure form), including descriptions of potential application areas.

This paper summarizes information on the olefin-based refrigerants currently in use, such as R1130(E), R1336mzz(Z), R1233zd(E), R1234ze(E), and R1234yf. It also includes several “new” molecules recently brought forward to serve as potential low GWP refrigerants by themselves or as components to create new low GWP refrigerant blends. These include R1224yd(Z), R1336mzz(E), R1123, R13I1 (CF₃I) and R1132a. In addition, potential future molecules suggested by McLinden (2017) are reviewed, such as R1132(E) and trifluoropropyne.



 
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