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Show 5. CONCLUSIONS 1) Enhancement and uniformization of the thermal field within the furnace section can be achieved with the introduction of hot air, using the concept of the high temperature excess enthalpy combustion. 2) The results obtained on a small water-tube boiler provided a significant improvement in thermal efficiency using regenerative heat exchangers operating at high frequency. 3) The experimental water tube boiler provided radiative section thermal efficiency of approximately 9 0 %. 4) The convective section of the boiler represents a negligible gain in thermal efficiency, and the boiler can be designed without the convective section. 5) Flow optimization through the radiative and convective section in the ratio of 65/35 resulted in a maximum boiler thermal efficiency of 9 7 % 6. ACKNOWLEDGEMENTS The authors would like to thank Professor A.K.Gupta of the University of Maryland for technical advice and discussions and for his contribution in organizing the paper. The authors would also like to thank Mr. T.Yasuda and Mr. H.Ikebe for their great assistance. 7. REFERENCES 1) Lloys, S.A. and Weinberg, F.J.: Nature, Vol. 251, pp47/49, (1974). 2) Tsuji, H.: Combustion Phenomena (3) 28,7 , pp907, (1976). 3) Harper, D.B. and Rohsenow, W.M.: Trans ASME, vol.75, pp759, (1953). 4) Coppage, J.E.: Trans ASME, vol.75 , pp779. (1953). 5) Heat Transfer Engineering, JSME , ppl84, (1976). 6) Tachibana, F. and Akiyama, M: Fundamental of Heat Transform, ppl42, (1975). A £loiclan Jlopxxi, <ScL& ^Dcxaco ^JcLLovcr EmexLtui. Radiation & Combination Coniultant 5122 Contoui <P£acc Del/^Jax (713) 729S451 Jioudon.DDC 77096-4116 £-*Mad: J.Loftus@att.net ||_g |