Analysis and application of variable conductance heat pipe air preheater
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Abstract
The heat transfer analysis of variable conductance heat pipe air preheater was carried out. The temperature transfer matrix was obtained for the air preheater that comprises several discrete heat transfer units with same or different heat transfer surface area in a parallel or counter flow mode. By using the temperature transfer matrix, the outlet fluid temperatures could be easily calculated for a given air preheater and inlet fluid temperatures. The active length of condenser in a variable conductance heat pipe is determined according to the flat interface model. With the same initial conditions, the comparisons between variable conductance heat-pipe air preheater and regular heat pipe air preheater has been analyzed and tested in terms of heat pipe wall temperature, heat transfer surface area and outlet fluid temperatures. Based on the real industrial applications, it has been confirmed that the variable conductance heat pipe air preheater has excellent performance of anti-corrosion and anti-ash-deposition especially at the variable working condition and the sulfur coal (5%–6% mass fraction of sulfur) condition.
Keywords
variable conductance heat pipe air preheater anti-corrosion anti-ash depositionPreview
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References
- [1]JUNG-YANG SAN et al. Performance of a serpentine heat exchanger: Part I-Effectiveness and heat transfer characteristics[J], Applied Thermal Engineering, 2009, 29(14–15): 3081–3087.CrossRefGoogle Scholar
- [2]DAVID KADYLAK et al. Effectiveness correlations for heat and mass transfer in membrane humidifiers[J], International Journal of Heat and Mass Transfer, Vol.52, No.5–6, 2009, pp1504–1509.MATHCrossRefGoogle Scholar
- [3]B. Mathew, H. Hegab. Application of effectiveness-NTU relationship to parallel flow microchannel heat exchangers subjected to external heat transfer. International Journal of Thermal Sciences, Vol.49, No.1, 2009, pp1–10.Google Scholar
- [4]Mostafa A. Abd El-Baky, Mousa M. Mohamed. Heat pipe heat exchanger for heat recovery in air conditioning, Applied Thermal Engineering, Vol.27, No.4, 2007, pp795–801.CrossRefGoogle Scholar
- [5]I. Kohtaka et al. Development, design and operation of large scale separate type heat pipe, Proc. of Sixth Int. Heat Pipe Conf, Grenoble, France, Vol.3, 1987, pp624.Google Scholar
- [6]Jin Mingcong, Chen Yuanguo, Heat pipe and heat pipe exchanger[M], Chongqing University Press. Chongqing, China, 1986Google Scholar
- [7]C.F. Than, K.S. Ong. Experiment and Prediction of Water -Filled Thermosyphon Heat Pipe Heat Exchanger Performance In Counterflow Air Streams Heat Pipe and Applications, Proceedings of the 13th International Heat Pipe Conference, Shanghai, China, 2005, pp568.Google Scholar
- [8]Lukitobudi, A.R., Akbarzadeh, A., Johnson, P.W., & Hendy, P., Design, construction and testing of a thermosyphon heat exchanger formedium temperature heat recovery in bakeries,Heat Recovery Systems & CHP, Vol.15, No.5, 1995, pp481–491.CrossRefGoogle Scholar
- [9]Shi Chengming, Hu Huili et al, Designing analysis and application of air preheater with filled gas heat pipe, Journal of Engineering for Thermal Energy and Power, Vol.19, No.3, 2004, pp306–308Google Scholar
- [10]Li Yourong et al, Calculation of heat pipe exchanger under variant working condition, Advance in application and research of heat pipe, The 3th national heat pipe conference symposium, Chongqing University Press, Chongqing, China, 1991, pp172.Google Scholar
- [11]Marcus, B. D. Theory and design of variable conductance heat pipe, NASA CR, Report No.2018, 1972.Google Scholar
- [12]Shi Chengming, Wang Yang et al, Performance analysis and application of three-fluid separate type heat pipe exchanger, Journal of Chongqing University, Vol.33, No.8, 2010, pp130–13.MathSciNetGoogle Scholar