TY - GEN
T1 - Transcritical R744 multi-temperature refrigerated container system designed for high ambient temperature operation
AU - Lawrence, Neal
AU - Elbel, Stefan
AU - Hrnjak, Pega
N1 - Funding Information:
The research presented in this paper was funded through the U.S. Army Natick Soldier Research, Development, and Engineering Center (NSRDEC). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the U.S. Army NSRDEC.
Publisher Copyright:
© 2020 International Institute of Refrigeration. All rights reserved.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020
Y1 - 2020
N2 - The paper describes the experimental evaluation of a transcritical R744 system designed to serve in a multi-temperature refrigerated container unit. The high ambient temperatures often encountered in this application, especially for a fluid like CO2, require careful attention to compressor selection and gas cooler design. To evaluate different compressor options, a laboratory breadboard CO2 system was used to test a single-stage compressor compared to an enhanced system with multi-stage compression and intercooler plus an ejector for improved evaporator performance and pressure lift. The results of the experimental evaluation show that the single-stage compression system is limited to an ambient temperature of about 40°C, while the multi-stage compression system is able to operate with sufficient capacity at ambient temperature in excess of 50°C. Also presented is the actual prototype CO2 refrigerated container unit to be evaluated.
AB - The paper describes the experimental evaluation of a transcritical R744 system designed to serve in a multi-temperature refrigerated container unit. The high ambient temperatures often encountered in this application, especially for a fluid like CO2, require careful attention to compressor selection and gas cooler design. To evaluate different compressor options, a laboratory breadboard CO2 system was used to test a single-stage compressor compared to an enhanced system with multi-stage compression and intercooler plus an ejector for improved evaporator performance and pressure lift. The results of the experimental evaluation show that the single-stage compression system is limited to an ambient temperature of about 40°C, while the multi-stage compression system is able to operate with sufficient capacity at ambient temperature in excess of 50°C. Also presented is the actual prototype CO2 refrigerated container unit to be evaluated.
KW - Booster Cycle
KW - Carbon Dioxide (CO, R744)
KW - Energy Efficiency
KW - High Ambient Temperature
KW - Refrigerated Container
KW - System Design
KW - Two-Phase Ejector
UR - http://www.scopus.com/inward/record.url?scp=85098199065&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85098199065&partnerID=8YFLogxK
U2 - 10.18462/iir.iccc.2020.292575
DO - 10.18462/iir.iccc.2020.292575
M3 - Conference contribution
AN - SCOPUS:85098199065
T3 - Refrigeration Science and Technology
SP - 197
EP - 204
BT - 6th IIR Conference on Sustainability and the Cold Chain, ICCC 2020 - Proceedings
PB - International Institute of Refrigeration
T2 - 6th IIR Conference on Sustainability and the Cold Chain, ICCC 2020
Y2 - 26 August 2020 through 28 August 2020
ER -