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 - Publisher Copyright:
© 2020 International Institute of Refrigeration. 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 -