caa a22 4500 465812090 CHVBK 20180323112119.0 cr unu---uuuuu 170327e19900901xx s 000 0 eng 10.1007/BF02831634 doi (NATIONALLICENCE)springer-10.1007/BF02831634 Modeling and parametric studies of heat transfer in a direct-fired batch reheating furnace [Elektronische Daten] [K. Chapman, S. Ramadhyani, R. Viskanta] A mathematical systems model of a batch reheating furnace has been developed to assist the furnace design and heat treatment engineer. The furnace was modeled as a well-stirred enclosure with one-dimensional transient heat conduction in the refractory walls and the load. The convective heat transfer rate to the load and refractory was calculated by using existing correlations from the literature. The radiative heat transfer rate to the load was calculated using Hottel's zone method by considering the radiant energy exchange between the load, combustion gases, and the refractories. The directed-flux exchange areas were calculated using a four-gray gas model to treat the combustion gases as a nongray emitting and absorbing medium. An extensive parametric investigation has been completed to determine the furnace design and operating characteristics that lead to optimum furnace efficiency. The parametric investigations included in this paper were used to study the effect of the load and refractory emissivities, load heat capacity, and fuel firing rate and direction on the thermal performance of a direct-fired furnace. Springer-Verlag New York Inc., 1990 Chapman K. Department of Mechanical Engineering, Kansas State University, 66506-5106, Manhattan, KS, USA aut Ramadhyani S. Heat Transfer Laboratory, School of Mechanical Engineering, Purdue University, 47907, West Lafayette, IN, USA aut Viskanta R. Heat Transfer Laboratory, School of Mechanical Engineering, Purdue University, 47907, West Lafayette, IN, USA aut Journal of Heat Treating Springer-Verlag 8/2(1990-09-01), 137-146 0190-9177 8:2<137 1990 8 136 https://doi.org/10.1007/BF02831634 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02831634 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chapman K. Department of Mechanical Engineering, Kansas State University, 66506-5106, Manhattan, KS, USA aut NATIONALLICENCE 700 1- Ramadhyani S. Heat Transfer Laboratory, School of Mechanical Engineering, Purdue University, 47907, West Lafayette, IN, USA aut NATIONALLICENCE 700 1- Viskanta R. Heat Transfer Laboratory, School of Mechanical Engineering, Purdue University, 47907, West Lafayette, IN, USA aut NATIONALLICENCE 773 0- Journal of Heat Treating Springer-Verlag 8/2(1990-09-01), 137-146 0190-9177 8:2<137 1990 8 136 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 465812090 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer