Track: Refrigeration
Sponsor: 10.6 Transport Refrigeration
Chair: Robert Chopko, Member, Carrier Transicold, Syracuse, NY
Two-phase ejectors are an attractive replacement for conventional expansion devices due to the opportunity to recover expansion work that can be used to improve cycle efficiencies, particularly with natural refrigerants such as CO2. Optimal use requires careful design of the components and system with regard to the full operating envelope, with attention to both the performance characteristics as well as manufacturability. Systems using natural refrigerants require additional technologies or considerations. This session covers important aspects of design and manufacturing for refrigeration ejector systems, including a study on the use of CO2 for transport refrigeration applications.

1. Modeling, Design and Efficiency of Two-Phase Ejectors to Increase Cop of Transport Refrigeration Systems
Stefan Elbel, Ph.D., University of Illinois at Urbana-Champaign, Urbana, IL
Two-phase ejectors are an attractive replacement for conventional expansion devices due to the opportunity to recover expansion work that can be used to improve cycle efficiencies. This presentation covers important aspects of ejector modeling and will provide basic design guidelines. The different ejector components are explained and typical efficiency and performance metrics are introduced. The presentation also elaborates on different control options that enable the use of ejectors for efficient part load operation and operation at off-design.

2. Manufacturing Considerations for Ejector Systems
David Lee, Member, Mueller Refrigeration, Hartsville, TN
Two-phase ejectors are an attractive replacement for conventional expansion devices due to the opportunity to recover expansion work that can be used to improve cycle efficiencies. Optimal use requires careful design with regard to the full operating envelope, including attention to manufacturability considerations. This seminar covers important aspects of manufacturing for ejector systems and their resulting impact on system design.

3. Application of Natural Refrigerant CO2 in Container Transport Refrigeration Systems and Potential Benefits and Impacts with CO2 Ejector Cycle
Ciara Poolman, United Technologies Corporation Climate Controls and Security, Jupiter, FL
CO2 Natural Refrigerant has been introduced in container transport refrigeration systems. Working in a wide range of ambient temperatures, meeting various set temperature requirements and temperature management are key to success. The background of the changes to natural refrigerant CO2 and technologies used in CO2 container refrigeration systems to meet product requirements is presented, and performance comparisons with alternate refrigerant systems is discussed. Additionally, follow on technological advances such as those in the areas of CO2 ejectors are reviewed, including their potential benefits and impacts to the current system design.

Presented: June 27, 2017, 8:00-9:30 AM
Run Time: 90 min.

This is a zip file that consists of PowerPoint slides synchronized with the audio-recording of the speaker (recorded presentation), PDF files of the slides, and audio only (mp3) for each presentation.