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A model for predicting the heat and mass transfer occurring inside a tube-in-tube counter current refrigerant cooled absorber (RCA) was developed. This particular heat exchanger has been used in a novel half-effect air cooled water ammonia chiller driven by low temperature heat (80°C), whose key operating principle consists in utilizing part of the liquid refrigerant leaving the condenser to cool the solution in which the remaining part of the refrigerant is absorbed after leaving the evaporator. During such operation, water-ammonia solution (with ammonia mass fraction about 0.55 – 0.65) at low pressure (4.5 - 5 bar) flows in the RCA annulus, counter-current with respect to the refrigerant (nearly pure ammonia at about 8 – 10 bar) flowing in the internal tube. Different simulation runs have been performed in order to explore the impact of different designs on the overall UA value and pressure drops. The model turned out to be very sensitive to the mass velocities of the two streams; an aspect that it is amplified by the mutual influence between annulus and tube heat transfer coefficients. The model predictions have been compared against a few experimental data which were observed during the test of the chiller prototype. Experimental data were found in reasonable agreement with simulation results.
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- Original title: Modeling and characterization of a tube-in-tube refrigerant cooled absorber.
- Record ID : 30014328
- Languages: English
- Source: International sorption heat pump conference (ISHPC2014), College Park, United States, March 31-April 2, 2014.
- Publication date: 2014/03/02
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- Date : 2017/04/23
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- Source: 5th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants.
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- Source: Green breeze from Asia: frontiers of refrigerants, heat transfer and system.. ACRA-2002. Proceedings of the Asian conference on refrigeration and air conditioning.
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- Author(s) : BOR D. M. van de, WANG Y., INFANTE FERREIRA C. A.
- Date : 2011/08/21
- Languages : English
- Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
- Formats : PDF
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- Author(s) : FARNOS J., PAPAKOKKINOS G., CASTRO J., et al.
- Date : 2017/08/07
- Languages : English
- Source: International sorption heat pump conference, ISHPC 2017, Tokyo august 7-10.
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Prediction and experimental investigation of he...
- Author(s) : OLBRICHT M., LUKE A.
- Date : 2015/08/16
- Languages : English
- Source: Proceedings of the 24th IIR International Congress of Refrigeration: Yokohama, Japan, August 16-22, 2015.
- Formats : PDF
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