This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
An Integrated Chemical Reactor-heat Exchanger based on Ammonium Carbamate
Technical Paper
2012-01-2190
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
In this work we present our recent effort in developing a novel heat exchanger based on endothermic chemical reaction (HEX reactor). The proposed HEX reactor is designed to provide additional heat sink capability for aircraft thermal management systems. Ammonium carbamate (AC) which has a decomposition enthalpy of 1.8 MJ/kg is suspended in propylene glycol and used as the heat exchanger working fluid. The decomposition temperature of AC is pressure dependent (60°C at 1 atmosphere; lower temperatures at lower pressures) and as the heat load on the HEX increases and the glycol temperature reaches AC decomposition temperature, AC decomposes and isothermally absorbs energy from the glycol. The reaction, and therefore the heat transfer rate, is controlled by regulating the pressure within the reactor side of the heat exchanger. The experiment is designed to demonstrate continuous replenishment of AC. This requires recovering the depleted glycol while expelling waste gases, dispersing and suspending fresh AC, and injecting the mixture into the heat exchanger. A gasketed plate heat exchanger is used as the reactor for this experiment, and heated water is used to provide the thermal load. The performance of the HEX reactor is characterized as a function of water flow rate and temperature, AC/glycol mixture flow rate, and AC concentration. Varying these parameters permits mapping the performance of the system under different conditions.
Recommended Content
Authors
Topic
Citation
Johnson, D., Patnaik, S., and Ervin, J., "An Integrated Chemical Reactor-heat Exchanger based on Ammonium Carbamate," SAE Technical Paper 2012-01-2190, 2012, https://doi.org/10.4271/2012-01-2190.Also In
References
- Anxionnaz, Z. Cabassud, M. Gourdon, C. Tochon, P. “Heat exchanger/reactors (HEX reactors): Concepts, technologies: State-of the-art,” Chemical Engineering and Processing: Process Intensification 47 12 2029 2050 2008
- Cybulski, A. Mouljin, J.A. Stankiewicz, A. “Novel Concepts in Catalysis and Chemical Reactors: Improving the Efficiency for the Future,” Wiley-VCH, Verlag GmbH & Co. KGaA Weinheim 2010
- IKA magicLAB Operating Manual IKA Werke GmbH & Co. KG Staufen 2010
- Kanda, T. Miyamoto, H. Iwami, S. “Measurement of Suspended Solid Concentration by using Image Processing Technique,” 1999 IAHR Congress Graz Proceedings 3-901351-34-5 1999
- Prat, L. Devatine, A. Cognet, P. Cassabud, M. Gourdon, C. Elgue, S. Chopard, F. “Performance Evaluation of a Novel Concept ‘Open Plate Reactor’ Applied to Highly Exothermic Reactions,” Chem Eng. Technol. 28 9 1028 1034 2006
- Schmidt, J. Dudis, D. Miller, D. “Expendable High Energy Density Thermal Management Material: Ammonium Carbamate,” AIAA Journal of Thermophysics and Heat Transfer 26 2 345 351 2012