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𝑚̇ 𝑁 p 𝑄 rp T Vd W Greek symbols 𝜂 𝜌 𝑣 Subscripts 1,2, etc. comp c o opt v is r mass flow rate compressor speed pressure capacity compressor pressure ratio temperature compressor swept volume work per unit time (power) efficiency density specific volume state points compressor cooling outlet optimum volumetric isentropic refrigerant (kg/s) (rev/sec) (bar) (W) (-) (°C or K) (m3) (W) (-) (kg/m3) (m3/kg) ̇ REFERENCES Boewe, D. E., McEnaney, R. P., Park, Y. C., Yin, J. M., Bullard, C. W., & Hrnjak, P. S. (1999). Comparative experimental study of subcritical R134a and transcritical R744 refrigeration systems for mobile applications. Tech. rep., Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign. Casson, V., Cecchinato, L., Corradi, M., Fornasieri, E., Girotto, S., Minetto, S., . . . Zilio, C. (2003). Optimisation of the throttling system in a CO2 refrigerating machine. International Journal of Refrigeration, 26, 926-935. Cecchinato, L., Corradi, M., Cosi, G., Minetto, S., & Rampazzo, M. (2012). A real-time algorithm for the determination of R744 systems optimal high pressure. International Journal of Refrigeration, 35, 817-826. Chakrabarti, Mitali, Montiel, A. P., Corrilo, I., He, J., Patti, A., . . . Schuermanns, K. (2017). CO2 Concentration in the Cabin in the Event of a Leak: CFD Simulation and Testing. SAE Technical Paper. Chen, Y., & Gu, J. (2005). The optimum high pressure for CO2 transcritical refrigeration systems with internal heat exchangers. International Journal of Refrigeration, 28, 1238-1249. Hu, B., Li, Y., Cao, F., & Xing, Z. (2015). Extremum seeking control of COP optimization for air-source transcritical CO2 heat pump water heater system. Applied Energy, 147, 361-372. Kauf, F. (1999). Determination of the optimum high pressure for transcritical CO2-refrigeration cycles. International Journal of Thermal Sciences, 38, 325-330. Kim, M. S., Shin, C. S., & Kim, M. S. (2014). A study on the real time optimal control method for heat rejection pressure of a CO2 refrigeration system with an internal heat exchanger. International Journal of Refrigeration, 48, 87-99. Kim, M.-H., Pettersen, J., & Bullard, C. W. (2004). Fundamental process and system design issues in CO2 vapor compression systems. Progress in energy and combustion science, 30, 119-174. Kim, S. C., Won, J. P., & Kim, M. S. (2009). Effects of operating parameters on the performance of a CO2 air conditioning system for vehicles. Applied Thermal Engineering, 29, 2408-2416. Lemmon, E. W., Huber, M. L., & McLinden, M. O. (2013). NIST Standard Reference Database 23: Reference Fluid Thermodynamic and Transport Properties-REFPROP, Version 9.1, National Institute of Standards and Technology. doi:http://dx.doi.org/10.18434/T4JS3C Li, D., & Groll, E. A. (2005). Transcritical CO2 refrigeration cycle with ejector-expansion device. International Journal of Refrigeration, 28(5), 766-773. 17th International Refrigeration and Air Conditioning Conference at Purdue, July 9-12, 2018 2643, Page 8PDF Image | Transcritical CO2 Heat Pump Cycle
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
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