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Book:
Vapor Compression Heat Pumps with Refrigerant Mixtures provides the first comprehensive, single-source treatment of working fluid mixtures and their applications in vapor compression systems. The authors explain in detail the thermodynamics of refrigerant mixtures, which is vastly more complex than that of individual refrigerants, as well as the fundamentals of various refrigeration cycles and methods for improving their efficiency. They also include important discussions on heat transfer and pressure drop correlations, experimental performance measurements and examples of using refrigerants and their mixtures, and critical operational issues such as control issues, refrigerant mixing, and mass fraction shifts.
Assembling reviews of the scattered literature on the subject and reflecting two decades of research by the authors, Vapor Compression Heat Pumps with Refrigerant Mixtures prepares you to design and implement systems that take the best advantage of fluid mixtures, confronting the challenges and grasping the opportunities that they present.
Chapter in Book:
Automotive Air-Conditioning, 2nd Edition, Chapter: Alternative Refrigeration Cycle,
Yunho Hwang, Published by Denso Corp., 2002.
Journal Papers:
- Review of Solar Cooling Technologies Y. Hwang, R. Radermacher, A. AlAlili, I. Kubo, International Journal of HVAC&R Research, Vol. 14, 2008
- Investigation of potential benefits of compressor cooling X. Wang, Y. Hwang and R. Radermacher, Applied Thermal Engineering, 2008
- Oil Concentration Measurement of CO2/PAG Mixture
Y. Hwang, R. Radermacher, and T. Hirata, International Journal of Refrigeration, Vol. 31, 2008
- Dynamic Behavior of Mobile Air Conditioning Systems A. Gado, Y. Hwang, R. Radermacher, International Journal of HVAC&R Research, Vol. 14, No. 2, 2008
- A Dynamic Test Facility for Mobile Air Conditioning Systems A. Gado, Y. Hwang, R. Radermacher, International Journal of Air-Conditioning and Refrigeration, Vol. 15, No. 4, pp. 147-155, 2007
- Integrating Alternative and Conventional Cooling Technologies
R. Radermacher, B. Yang, and Y. Hwang, ASHRAE Journal, Vol. 49, No. 10, pp. 28-34, Oct. 2007.
- Convective Gas Cooling Heat Transfer and Pressure Drop Characteristics of Supercritical CO2/Oil Mixture in a Minichannel Tube
R. Yun, Y. Hwang, R. Radermacher, International Journal of Heat and Mass Transfer, In Press, 2007.
- Comparison of R-290 and Two HFC Blends for Walk-In Refrigeration Systems
Y. Hwang, D. Jin, R. Radermacher, International Journal of Refrigeration, Vol. 30, pp. 633-641, 2007.
- Refrigerant Distribution in Minichannel Evaporator Manifolds
Y. Hwang, D. Jin, R.Radermacher, International Journal of HVAC&R Research, Vol. 13, No. 4, pp. 543-555, 2007.
- Oil Distribution in a Transcritical CO2 Air Conditioning System
Y. Hwang, J. Lee, R. Radermacher, Applied Thermal Engineering, Vol. 27, pp. 2618-2625, 2007.
- Heat Exchanger Design for CO2 Cycle with a Linear Compressor
Y. Hwang, V. Singh, R. Radermacher, International Journal of HVAC&R Research, Vol. 13, N. 3., pp. 471-483, 2007.
- Experimental Investigation of Oil Retention in Air Conditioning Systems
L. Cremaschi, Y. Hwang, R. Radermacher, International Journal of Refrigeration, Vol. 28, pp.1018-1028, 2005.
- Potential Energy Benefits of Integrated Refrigeration System with Microturbine and Absorption Chiller
Y. Hwang, International Journal of Refrigeration, Vol. 27, No. 8, pp. 816-829, 2004.
- Comparing R-290 with R22 in Heat Pumps
Y. Hwang, A. Gado and R. Radermacher, ASHRAE Journal, Vol. 45, No. 1, p. 40, 2003.
-An Experimental Evaluation of a Residential-sized Evaporatively-Cooled Condenser Y. Hwang, Reinhard Radermacher, and W. Kopko, International Journal of Refrigeration, Vol. 24, No. 1, pp. 238-249, 2001.
- Evaporatively-Cooled Condenser with Rotating Disks Y. Hwang, S.I. Haider, B. Markey, and Reinhard Radermacher, Journal of Enhanced Heat Transfer, Vol. 7, pp.273-287, 2000.
- Experimental Investigation of The Carbon Dioxide Refrigeration Cycle Y. Hwang and R. Radermacher, ASHRAE Transaction, CH-99-22-2, Jan 1999.
- Natural Refrigerants Y. Hwang, M. Ohadi, and R. Radermacher, Published: Mechanical Engineering, pp. 96-99, Vol. 120, No. 10, 1998.
- Theoretical Evaluation of Carbon Dioxide Refrigeration Cycle Y. Hwang and R. Radermacher, Published: International Journal of HVAC&R Research, Vol. 4, No. 3, pp. 245-263, July 1998.
- Experience with Refrigerant Mixtures Y. Hwang, J. Judge, and R. Radermacher, Published: ASHRAE Transaction, Jan. 1997. (PH-97-9-3)
- Performance Assessment of Multistage Absorption Cycles K. Cheung, Y. Hwang, J.F. Judge, A. Singh and R. Radermacher, Published: International Journal of Refrigeration, Vol. 19, No. 7, pp. 473-481, 1996
Key Note Papers:
- Refrigerant Distribution in Microchannel Evaporators
Y. Hwang, D. Jin, and R. Radermacher, International Congress of Refrigeration, Beijing, China, 2007.
- Two-stage Cycle with Vapor Injection Compressor
- Oil Management in Hermetic Vapor Compression Cycle, Y. Hwang, The 5th International Conference on Compressor and Refrigeration, Dalian, China, 2005.
- Integration of Air-conditioning and Refrigeration with Distributed System, Y. Hwang and R. Radermacher, International Congress of Refrigeration, Washington D.C., 2003.
- Alternative Refrigerant Heat Pump and Refrigeration Systems, R. Radermacher and Y. Hwang, Proceedings of the 12th International Heat Transfer Conference, Vol. 1, pp. 395-402, Grenoble, France, 2002.
- Emerging Refrigerants, Y. Hwang and R. Radermacher, Proceedings of IIR Conference, “Emerging Trends,” pp. 1.1-1.14, New Delhi, India, 1998.
Conference Papers:
- Cycling in Climate Control Systems with Orifice Tube and Thermostatic Expansion Valve
Y. Hwang, A. Gado, and R. Radermacher, SAE World Congress, Detroit, MI, Paper No. 07-HX-03, 2007.
- Gas Cooling Heat Transfer and Pressure Drop Characteristics of CO2/Oil Mixture in a Microchannel
R. Yun, Y. Hwang, and R. Radermacher, Proceedings of 7th IIR Gustav Lorentzen Conference on Natural Working Fluids, Trondheim, Norway, 2006.
- Performance Potential of CO2 Cycle for a Medium Temperature Refrigeration System
Y. Hwang, R. Radermacher, S. Hwang, H. Lee, amd S. Ha, Proceedings of The 3rd Asian Conference on Refrigeration and Air-conditioning, Gyeongju, Korea, 2006.
- Field Performance Measurements of a VRV AC/HP System
T. Aynur, Y. Hwang, R. Radermacher, International Refrigeration Conference at Purdue, West Lafayette, IN, 2006
- Comparison of Performance of a Residential Air-Conditioning System Using Microchannel and Fin-and-Tube Heat Exchanger
R. Yun, Y. Hwang, R. Radermacher, and R. Zecirovic, International Refrigeration Conference at Purdue, West Lafayette, IN, 2006.
- Performance Potential of CO2 Cycle with a Linear Compressor
Y. Hwang, R. Radermacher, S. Hwang, H. Lee, S. Ha, International Refrigeration Conference at Purdue, West Lafayette, IN, 2006.
- Comparison of Hydrocarbon R-290 and Two HFC Blends R-404A and R-410A for Low Temperature Refrigeration Applications
Y. Hwang, D. Jin and R. Radermacher, IIR Conference for Commercial Refrigeration, Italy, 2005.
- Performance of a Two-Stage Carbon Dioxide Compressor with an Intercooler, Y. Hwang, X. Wang and R. Radermacher, The 5th International Conference on Compressor and Refrigeration, Dalian, China, 2005.
- Performance Measurements of CO2 Heat Exchanger, Y. Hwang, D. Jin, and R. Radermacher, ASHRAE Annual Meeting, 2005.
- Interfacial Friction Factor between Gaseous CO2 and Oil, Y. Hwang, 6th World Conference on ExHTF, 2005.
- Dynamic Performance Measurement Method Integrated with Cabin Model, A. Gado, Y. Hwang, and R. Radermacher, SAE World Congress, 2005.
- Oil Retention in Unitary Air Conditioner, R. Radermacher and Y. Hwang, ASHRAE Annual Meeting, 2005.
- Oil Retention Modeling in the Suction Line of Air Conditioner, Y. Hwang and R. Radermacher, ASHRAE Annual Meeting, 2005.
- Carbon Dioxide as a Refrigerant, Y. Hwang and R. Radermacher, ASHRAE Winter Meeting, 2005.
- Cyclic Performance of Vapor Compression Systems with Emphasis on Moisture Removal, R. Radermacher, Y. Hwang, and A. Gado, VDA Alternative Refrigerant Winter Meeting, 2005.
- Oil Circulation Rate in CO2 Cycle, T. Hotta, Y. Ozaki, T. Hirata, and Y. Hwang, The International Symposium on New Refrigerants and Environmental Technology, JRAIA, Japan, 2004.
- Life Cycle Climate Performance (LCCP) Analysis of Propane and Two HFC Blends in Direct Expansion Medium Temperature Refrigeration Systems
Y. Hwang and R. Radermacher, 6th Gustav Lorentzen Natural Working Fluids Conference at Glasgow, UK, 2004.
- Performance Evaluation of A Two-Stage Carbon Dioxide Compressor
Y. Hwang, J. Muehlbauer, and R. Radermacher, 6th Gustav Lorentzen Natural Working Fluids Conference at Glasgow, UK, 2004.
- Performance Measurements of A Forced Convection Air-Cooled Rack
Y. Hwang, R. Radermacher, S. Spinazzzola, and Z. Menachery, ITHERM 2004.
- Two-stage Rolling Piston Carbon Dioxide Compressor
N. Dreiman, R. Bunch, Y. Hwang, and R. Radermacher, the International Refrigeration Conference at Purdue, West Lafayette, IN, 2004.
- Investigation of Oil Retention in Residential Heat Pump
L. Cremaschi, Y. Hwang, R. Radermacher, International Refrigeration Conference at Purdue, West Lafayette, IN, 2004.
- Measurements of the Dynamic Performance and Behavior of Air-Conditioning Systems Using a Dynamic Test Facility
A. Gado, Y. Hwang, and R. Radermacher, International Refrigeration Conference at Purdue, West Lafayette, IN, 2004.
- Performance of CO2 Cycles with a Hermetic, Two-Stage CO2 Compressor
A. Celik, Y. Hwang, R. Radermacher, International Refrigeration Conference at Purdue, West Lafayette, IN, 2004.
- Oil Circulation Behavior in Low Temperature CO2 Climate Control Systems
Y. Hwang, L. Cremaschi, R. Radermacher, T. Hirata, Y. Ozaki, and T. Hotta, SAE SP-1859, pp. 33-38, 2004.
- Performance Potential of Two-stage CO2 Cycles
Y. Hwang, C-Dig Meeting at UIUC, 2004.
- Comparison of Oil Retention in R134a and CO2 Climate Control Systems
L. Cremaschi, Y. Hwang and R. Radermacher, 2004 Alternate Refrigerant Systems Symposium, SAE, Phoenix, AZ, 2004
- Comparison of Hydrocarbon R-290 and Two HFC Blends R-404A and R-410A for Medium Temperature Refrigeration Applications
Y. Hwang, D. Jin, and R. Radermacher, 15th Annual Earth Technologies Forum, Washington D.C., 2004.
- Alternative Refrigerants Research at CEEE: Two-stage CO2 System and Hydrocarbon Alternatives
Y. Hwang and R. Radermacher, International Seminar on Natural Refrigerants, Japan, 2004
- Measurement of the Dynamic Performance of Climate Control Systems Using a Dynamic Test Facility
Y. Hwang, A. Gado, and R. Radermacher, VDA Alternative Refrigerant Winter Meeting, 2004.
- Thoughts on CO2 Compressor Testing and Rating
Y. Hwang and R. Radermacher, Seminar 24, ASHRAE Winter Meeting, 2004.
- Performance of Propane in a Unitary Heat Pump
Y. Hwang, A. Gado, and R. Radermacher, Proceedings of the Int. Congress of Refrigeration, Washington D.C., 2003.
- Oil Circulation Ratio in CO2 Climate Control Systems
Y. Hwang, L. Cremaschi, R. Radermacher, T. Hirata, Y. Ozaki, and T. Hotta, SAE World Congress, 03HX-25, 2003.
- Performance Comparison of Hydrocarbon R-290 with R-22 in Residential Heat Pump System Yunho Hwang, Amr Gado, and Reinhard Radermacher, Published: Proceedings of The 5th IIR-Gustav Lorentzen Conference, pp. 603-610Guangzhou, China, 2002.
- Options for A Two-Stage Transcritical CO2 Cycle Hans Huff, Yunho Hwang, and Reinhard Radermacher, Published: Proceedings of The 5th IIR-Gustav Lorentzen Conference, Guangzhou, China, 2002.
- Oil Circulation Ratio Measurement in CO2 Cycle Yunho Hwang, Lorenzo Cremaschi, and Reinhard Radermacher, Published: Proceedings of The 2002 International Conference: New Technologies in Commercial Refrigeration, pp. 22-28, Urbana-Champaign, IL, 2002.
- Alternative Refrigerant Heat Pump and Refrigeration Systems Reinhard Radermacher and Yunho Hwang, Published: Proceedings of 12th International Heat Transfer Conference, Vol. 1, pp. 395-402, Grenoble, France, 2002.
- High-Side Pressure Optimization in Transcritical CO2 Cycles with Work-Extracting Expansion Devices Hans Huff, Yunho Hwang, and Reinhard Radermacher, Published: Proceedings of The 2002 Alternative Refrigerant Systems Symposium, SAE, Phoenix, AZ, 2002.
- An Experimental Investigation on Oil Retention Characteristics in CO2 Air-Conditioning Systems Jun-Pyo Lee, Yunho Hwang, and Reinhard Radermacher, Published: Proceedings of The International Compressor Engineering Conference and Refrigeration and Air Conditioning Conference, Purdue, IN, July 2002.
- Opportunities with Alternative Refrigerants Yunho Hwang and Reinhard Radermacher, Published: ITHERM 2002, San Diego, CA, 2002.
- CO2 Transcritical Cycles for High Temperature Applications Yunho Hwang, Hans Huff, Marcus Preissner, and Reinhard Radermacher, Published: Proceedings of 2001 ASME IMCE, Vol. 3, AES-23630, New York, NY, November 2001.
- Experimental Investigation on Oil Accumulation Characteristics in Vertical Suction Line Jun-Pyo Lee, Yunho Hwang, Reinhard Radermacher, and Sunil Mehendale, Published: Proceedings of 2001 ASME IMCE, Vol. 3, AES-23607, New York NY, November 2001.
- An Experimental Investigation on Flow Characteristics of Refrigerant/Oil Mixture in Vertical Upward Flow Yunho Hwang, Jun-Pyo Lee, and Reinhard Radermacher, Published: Proceedings of 4th IIR-Gustav Lorentzen Conference, Purdue, IN, July 2000.
- Development of Carbon Dioxide Environmental Control Unit Brett Cutler, Yunho Hwang, and Reinhard Radermacher, Published: Proceedings of 4th IIR-Gustav Lorentzen Conference, Purdue, IN, July 2000.
- Comparison of Automotive Air-Conditioning System with CO2 and R134a M. Preissner, B. Cutler, S. Singanamalla, Y. Hwang, and R. Radermacher, Published: Proceedings of 4th IIR-Gustav Lorentzen Conference, Purdue, IN, July 2000.
- Development of Hermetic Carbon Dioxide Compressor Yunho Hwang and Reinhard Radermacher, Published: Proceedings of 1998 International Refrigeration Conference at Purdue, pp. 171-175, West Lafayette, In, July. 1998.
- Experimental Investigation of CO2 Water Heater Yunho Hwang and Reinhard Radermacher, Published: Proceedings of 1998 IIR-Gustav Lorentzen Conference, pp. 321-328, Oslo, Norway, June. 1998.
- Emerging Refrigerants Yunho Hwang and Reinhard Radermacher, Published: Proceedings of IIR Conference, pp. 1.1-1.14, New Delhi, India, Mar. 1998.
- Boiling Heat Transfer Correlation for Carbon Dioxide Yunho Hwang, Byungha Kim, and Reinhard Radermacher, Presented: IIR International Conference, University of Maryland, College Park, MD, Nov. 1997.
- Evaluation of Carbon Dioxide Heat Exchanger Yunho Hwang and Reinhard Radermacher, Presented: IIR International Conference, University of Maryland, College Park, MD, Nov. 1997.
- Carbon Dioxide Heat Pump System Yunho Hwang and Reinhard Radermacher, Presented: IIR Workshop on CO2 Technology in Refrigeration, Heat Pump & Air Conditioning Systems, Trondheim, Norway, May 1997.
- An Experimental Evaluation of Flammable and Non-Flammable High Pressure HFC Replacements for R-22 Mohit Pande, Yunho Hwang, John Judge, and Reinhard Radermacher, Published: Proceedings of 1996 International Refrigeration Conference at Purdue, pp. 21-27, Purdue, IN, Jul. 1996.
- Evaluation of R-22 Alternatives for Heat Pumps Yunho Hwang, John Judge, and Reinhard Radermacher, Published: Proceedings of 1995 ASME International Mechanical Engineering Congress, pp. 11-17, San Francisco, CA, Nov. 1995.
- Experimental Results of Two Drop-In Replacement Refrigerants for HCFC-22 John Judge, Yunho Hwang, and Reinhard Radermacher, Published: 19th International Congress of Refrigeration, Vol. IVb, pp. 1168-1175, The Hague, The Netherlands, Aug. 1995.
- An Experimental Evaluation of Medium and High Pressure HFC Replacements for R-22 Yunho Hwang, John Judge, and Reinhard Radermacher, Published: 1995 International CFC and Halon Alternatives Conference, pp. 41-48, Washington D.C., 1995.
Activities:
1999 to present: ASME, Member
1999 to present: SAE, Associate Member 1998 to present: EPA Chief Examiner (Proctor number: 213-39-8566-1199) 1990 to present: ASHRAE, Member 1983 to present: SAERAK, Life Member 1991 to present: IIR, Associate Member, Commission B2 Secretary (2000-present)
Patents:
Paper Reviews:
Certification:
EPA Certified Universal Technician per Section 608 of Clean Air Act
