Commercial Food and Beverage Refrigeration Equipment
ASHRAE Technical Committee 10.7

Meetings Information

TC 10.7 has the following technical session sponsored or cosponsored for the meeting are:

Wednesday, June 28, 8:00 AM - 9:30 AM
Seminar 50
High Efficiency Commercial Refrigeration Systems with Natural Refrigerants
Track: Refrigeration
Room: 201A
Sponsor: 10.7 Commercial Food and Beverage Refrigeration Equipment, Refrigeration Committee, TC8:1 Positive Displacement Compressors; TC3.1 Refrigerants and Secondary Coolants
Chair: Georgi Kazachki, Ph.D., Fellow ASHRAE, Dayton Phoenix Group, Inc., Dayton, OH
Commercial refrigeration systems have been some of the largest contributors to refrigerant leaks, second to automotive air-conditioning. For this reason, they became the most intensely studied application for natural refrigerants, such as ammonia and carbon dioxide. These systems went through a substantial evolution in the last 10-15 years to accommodate ammonia and CO2 specific properties (safety class B2 for ammonia and low critical temperature and high pressures in certain conditions for CO2) and, at the same time, to be cost and efficiency competitive with the HFC systems. The seminar demonstrates the outcome of this evolution through the featured presentations.
1. Doing It All Efficiently with CO2 Refrigeration Anywhere in the World
Klaas Visser, P.E., Affiliate, KAV Consultants Pty Ltd, Kangaroo Flat, Australia
This presentation examines the benefits of Evaporative Condensers/Gas Coolers (EC/GCs) where the cooling medium temperature is the Ambient Wet Bulb Temperature (AWBT) and not the ambient dry bulb temperature as is the case with air cooled gas coolers. A 1% incidence AWBT of 28°C is not exceeded in 98% of the world’s climates. At a AWBT of 28°C it is relatively easy to achieve a gas cooler CO2 exit temperature 31°C and even 30°C at part load. This means that efficient CO2 refrigeration may be operated all over the world with the use of EC/GCs.
2. Design and Performance Validation of Ultralow Charge Ammonia Cascade System for Retail Food Environment
Karthick Kuppusamy, Heatcraft-Kysor/Warren, COLUMBUS, GA
Natural refrigeration technology in supermarkets is driven by growing global concerns around energy and environment. Energy efficiency, safety and reliability are key characteristics of supermarket system design. A field test is carried out on a Supermarket with ammonia system as top cycle catering to MT and LT refrigeration loads. The entire system is designed with state-of-the-art energy efficient features and ultra-low ammonia charge @ 0.75 Lbs / TR. A brief overview of design considerations and test results are presented. Superior efficiency of ammonia is demonstrated in a side by side energy study with HFC that is validated by third party.
3. Opportunities for Utilizing Two-Phase Ejectors to Increase Efficiency of Commercial Refrigeration Systems Using Natural Refrigerants
Stefan Elbel, Ph.D., Member, Creative Thermal Solutions and University of Illinois at Urbana-Champaign, Urbana, IL
The low GWP of natural refrigerants makes them great candidates for commercial refrigeration. An important characteristic of transcritical CO2 cycles are the substantial throttling losses that negatively impact energy efficiency at high ambient temperatures. This presentation introduces numerous ways of improving COP at demanding outdoor conditions, and the emphasis will be on utilizing two-phase ejectors. A variety of cycle options exist that allow integration of ejectors, including utilization of the recovered energy to unload the compressor, to provide cooling at different temperature levels and to improve efficiency by using the ejector to drive refrigerant overfeed in liquid recirculation cycles.
4. Packaged Ammonia/CO2 Systems for Refrigeration
Scott Mitchell, Associate Member, Southern California Edison, Irwindale, CA
This presentation provides the final results from field testing of a packaged ammonia/carbon dioxide system installed in Irvine, CA. The unit was one of the first of its kind installed in North America and provides a glimpse at how natural refrigerants can be applied to systems where they previously were not used. The project was featured in a Feb 2016 ASHRAE Journal article.
Wednesday, January 27, 2016 8:00-9:30 am
Improving the Efficiency of Low-GWP Commercial Refrigeration Systems
Chair: Shitong Zha, Ph.D., Member, HILLPHOENIX, Conyers, GA  
Commercial refrigeration systems are searching for low-GWP refrigerant options due to the environmental responsibility and governmental regulations to limit the use of high-GWP refrigerants. Energy efficiency is very important in the refrigerant transition. The seminar covers commercial refrigeration systems using both natural refrigerant and low-GWP synthetics. How to increase R744 system efficiency when it operates at elevated ambient temperature? What is the R744 system with ejector technology? What is the Hybrid Geothermal R744 system? How to change the equipment design and control of low-GWP synthetics refrigeration to improve energy efficiency?

1. Commercial Refrigeration Applying R744 Refrigeration Technologies: a Global Perspective
Armin Hafner, Ph.D., SINTEF, Trondheim, GA
2. Energy Efficiency Improvements for Refrigeration Systems with Low-GWP Refrigerants
Gustavo Pottker, Member, Honeywell - Buffalo Research Laboratory, Buffalo, NY
3. Hybrid Geothermal R744: an Alternative to Transcritical Booster Technology
Jason Robbins, P.E., Member, Walgreens, Inc., Deerfield, IL
4. Beverage Vending Machines: an Alternative Refrigerant to “Chill out”
Sean Gouw, Associate Member, Southern California Edison, Irwindale, CA

Sunday, January 24, 2016  3:15-4:45 pm
Highlights from the 24 IIR International Congress of Refrigeration
Chair: Van D. Baxter, P.E., Fellow ASHRAE, Oak Ridge National Laboratory, Oak Ridge, TN
The seminar goal is to bring to ASHRAE members the technical highlights of the 24th IIR International Congress of Refrigeration held August 16-22, 2015 in Yokohama, Japan. The seminar starts with an overview of the Congress program. This is followed by three keynotes from the Congress dealing with latest issues/developments related to low-GWP refrigerants, microchannel heat exchangers and heat pumps in smart energy systems.

1. Overview of the 24th IIR Congress
Piotr Domanski, Ph.D., Fellow ASHRAE, National Institute of Standards and Technology, Gaithersburg, MD
2. Hitting the Bounds of Chemistry: Limits and Tradeoff for Low-GWP Refrigerants
Mark O. McLinden, Ph.D., Member, National Institute of Standards and Technology, Boulder, CO
3. New Developments in Microchannel Heat Exchangers
Predrag Hrnjak, Ph.D., Fellow ASHRAE, University of Illinois, Urbana, IL
4. The Role of Heat Pumps in Smart Energy Systems
Per Lundqvist, Ph.D., KTH, The Royal Institute of Technology, Stockholm, Sweden

Tuesday, January 26, 2016 8:00-9:30 am
Best Practices in Manufacturing, Field Installation and Servicing Refrigeration and Air-Conditioning Systems
Chair: Georgi Kazachki, Ph.D., Fellow ASHRAE, Dayton Phoenix Group, Inc., Dayton, OH  
The efficient, reliable and environmentally sound operation of refrigeration and air-conditioning systems depends to a large extent on the presence of moisture, non-condensables, contaminants and refrigerant leaks. Good practices have been established over the years, yet time and cost-reduction pressures often lead to questioning some of these practices, such as minimizing component exposure to ambient before assembly and installation, brazing with inert gas, leak elimination and deep evacuation before charging with the proper amount of fresh refrigerant. This seminar illustrates the best practices with respect to the system chemistry and material compatibility in refrigeration systems.

1. Using a Protective Atmosphere during Brazing of HVAC and Refrigeration Tubing and Its Effect on the Formation of System Contamination
Marc Scancarello, P.E., Member, Emerson Climate Technologies, Inc., Sidney, OH
2. Effects of Process Lubricants for Fin Stamping, Tube Bending and Construction of HVAC&R Systems
Robert Turner, Metalloid Corporation, Sturgis, MI
3. Impact of Refrigeration System Commissioning on Energy Usage and System Reliability
Michael Collins, Carlyle Compressor Company, Syracuse, NY
4. Servicing AC and Refrigeration Systems for Efficiency and Reliability
Robert Scorupsky, P.E., Member, Daikin America, Inc., New Brunsuick, NJ 

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ALL ASHRAE committee meetings, including this TC’s meetings at the Winter and Annual Society conferences, are open to the public at no cost nor is conference registration required. Interested visitors, local chapter members, and potential new TC members are always welcome. However to attend technical program sessions sponsored by the TC will require registration and payment of any applicable fee.

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