Thermal Analysis of Heat Recovery Unit to Recover Exhaust Energy for Using in Organic Rankine Cycle

Abstract:

Heat engines convert only approximately 20% to 50% of the supplied energy into mechanical work whereas the remaining energy is lost as rejected heat. Although some of the energy lost is intrinsic to the nature of an engine and cannot be fully overcome (such as energy lost due to friction of moving parts), a large amount of energy can potentially be recovered. This paper presents a heat transfer analysis of a WHE for recovering wasted exhaust energy whilst transferring energy to different organic working fluid used in the OrganicRankine Cycle. The types of considered fluids are R-134a, Propane and Ammonia. The results show that the Ammonia has the highesteffectiveness of 0.25. The maximum heat transferrate of 48.5 kW was recovered using the Ammonia at the exhaust gas temperature of 700°C.

• Periodical: Applied Mechanics and Materials (Volume 393)
• Pages: 781-786
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.393.781
• Online since: September 2013
• Authors: Aman M.I. bin Mamat, Wan Ahmad Najmi Wan Mohamed
• Keywords: Heat Transfer, Sustainable Energy, Thermal Modelling, Waste Heat Recovery

References

[1] U.S. Energy Information Administration (EIA), International Energy Outlook 2012, U.S. Energy Information Administration (EIA), DOE/EIA-0383(2012), Washington DC, United States, June (2012).

DOI: 10.2172/10122340

[2] Taylor, A. M. K. P., Science review of internal combustion engines, Energy Policy, Vol. 36, No. 12, 2008, pp.4657-4667.

DOI: 10.1016/j.enpol.2008.09.001

[3] Hui, S., Lifu, Y., and Junqing, J., Hydraulic/electric synergy system (HESS) design for heavy hybrid vehicles, Energy, Vol. 35, No. 12, 2010, pp.5328-5335.

DOI: 10.1016/j.energy.2010.07.027

[4] Leising, C. J., Purohit, G. P., DeGrey, S. P., and Finegold, J. G., Waste Heat Recovery In Truck Engines, West Coast Meeting, Society of Automotive Engineers (SAE), Paper No: 780686, Warrendale, Pensylvania, USA, (1978).

DOI: 10.4271/780686

[5] Larjola, J., Electricity from industrial waste heat using high-speed organic Rankine cycle (ORC), International Journal of Production Economics, Vol. 41, No. 1GÇô3, 1995, pp.227-235.

DOI: 10.1016/0925-5273(94)00098-0

[6] Ohman, H., Implementation and evaluation of a low temperature waste heat recovery power cycle using NH3 in an Organic Rankine Cycle, Energy, Vol. 48, 2012, pp.227-232.

DOI: 10.1016/j.energy.2012.02.074

[7] Gnielinski., G. New Equations for Heat and Mass Transfer in Turbulent Pipe and Channel Flow, International Chemical Engineering 16, 1976, pp.359-368.

[8] Kays. W.M., London. A.L., Compact Heat Exchanger, 3rd edition, New York McGraw Hill, (1984).

[9] Incropera, F.P., Dewit, D.P., Bergman, T.L. and Lavine, A. S Fundamentals of Heat And Mass Transfer, 6th edition, Singapore, John Wiley & Sons, (2007).