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01056 The impact of recycling of organic carbon on the stable carbon isotopic composition of dissolved inorganic carbon in a stratified marine system (Kyllaren fjord, Norway)
17 Energy conservation and recycling from the 0 2 supply side. This novel reactor enhances the safety of M D D , allows reuse of m e t h a n e as fuel, and reduces m e t h a n e leakage to the atmosphere.
06•01055 Probabilistic aspects in the technical and economic analysis of the industrial waste heat recovery system generating useful heat and refrigeration Koziol, J. and Banasiak, K. hTternational Journal of Energy Research, 2005, 29, (6), 485 497. The technical and economic analysis of the industrial waste heat recovery system, considering probabilistic distribution of the input data is presented. A prospect and rationality of the application of the waste heat boiler and absorption refrigerator has been examined as an example, in view of covering integrated heat and refrigeration demands. The influence of changing a m b i e n t conditions as well as the exhaust gas t e m p e r a t u r e and its flow rate on the overall system performance has been simulated and assessed.
06•01057 Thermodynamic optimization of a reheat chemically recuperated gas turbine Carapellucci, R. and Milazzo, A. Energy Conversion and Management, 2005, 46, (18 19), 2936 2953. The feasibility of integrating a commercially available r e h e a t gas turbine with a m e t h a n e steam reformer is analysed. A slight modification to the original r e h e a t design is proposed to improve the m e t h a n e conversion rate in the reforming process and, consequently, the efficiency in recovering waste exhaust heat from the gas turbine. Two solutions are proposed for the heat recovery scheme: a first reformer has a single pressure level while the second has two in order to match the different pressures of the combustors. W h i l e the single pressure scheme gives good performance with respect to the stand alone gas turbine, the dual pressure reformer can give a further benefit, as far as an accurate optimization of the s t e a m m a n a g e m e n t is performed.
06•01056 The impact of recycling of organic carbon on the stable carbon isotopic composition of dissolved inorganic carbon in a stratified marine system (Kyllaren fjord, Norway)
06•01058 Thermodynamic performance of a double-effect absorption heat-transformer using TFE/E181 as the working fluid
van Breugel, Y. et al. Organic Geochemistry, 2005, 36, (8), 1163 1173. A negative carbon isotope shift in sedimentary organic carbon deposited in stratified marine and lacustrine systems has often been inferred to be a consequence of the process of recycling of respired and, therefore, 13C-depleted, dissolved inorganic carbon (DIC) formed from mineralization of descending organic matter. To study this process, we m e a s u r e d b 13 C D I C and d 13 C values of particulate organic carbon (POC) over an a n n u a l cycle in the permanently stratified Kyllaren fjord in Norway. A notable a c c u m u l a t i o n of respired D I C below the chemocline was evident from the substantially 13C-depleted D I C (ca. 19%o). Especially in a u t u m n to early spring, respired D I C from the deep anoxic water is mixed into the oxygenated surface water and the calculated respired D I C contribution to the total D I C pool was up to ~ 4 0 % in early spring in the upper 2 m of the water column. A t 4 m depth, just below the chemocline, the respired D I C contribution reaches ca. 90% of the total D I C pool. A s s i m i l a t i o n of the respired D I C seems to exert only a small effect on 613CP°C, which has an average 613C value of 24%0. The measured p h o t o a u t o t r o p h i c fractionation (ep) was low ( < 10%o) during the majority of the year. This is likely responsible for reducing the a p p a r e n t impact of recycling of respired D I C on 613C p°C. However, in June 2002, p h o t o a u t o t r o p h i c use of the 13C-depleted D I C is obvious from a 13C-depletion of POC ( 33.7%0) derived from a b l o o m of the protist Euglena sp.
Zhao, Z. et al. Applied Energy, 2005, 82, (2), 107 116. T r i f l u o r o e t h a n o l ( T F E ) tetraethylenglycol d i m e t h y l e t h e r ( T E G D M E or E l 8 1 ) is a new organic working-pair which is non-corrosive, completely miscible and thermally stable up to 250:C. It is suitable for upgrading low-temperature level industrial w a s t e - h e a t to a higher t e m p e r a t u r e level for reuse. In this paper, the t h e r m o d y n a m i c performance of the double-effect absorption heat-transformer ( D E A H T ) using TFE/E181 as the working fluid is simulated, based on the t h e r m o d y n a m i c properties of TFE/E181 solution. The results show that, w h e n the t e m p e r a t u r e in the high-pressure generator exceeds 100:C and the gross t e m p e r a t u r e lift is 30:C, the coefficient of performance (COP) of the D E A H T is a b o u t 0.58, which is larger than the 0.48 of the single-stage absorption heat-transformer (SAHT), the increase of COP is about 20%,. But it is still less than 0.64 of the D E A H T using LiBr H 2 0 as the working fluid. Meanwhile, the C O P of the D E A H T decreases more rapidly with increases of the absorption t e m p e r a t u r e than that for the SAHT. The range of available gross temperature-lift for the D E A H T is narrower than that of the SAHT. The higher the t e m p e r a t u r e in the high-pressure generator, the larger the gross temperature-lift could be. So the double-effect absorption heat-transformer is more suitable for being applied in those circumstances of having a h i g h e r - t e m p e r a t u r e heat-resource and when a higher temperature-lift is not needed.
152
Fuel and Energy Abstracts
March 2006
06•01055 Probabilistic aspects in the technical and economic analysis of the industrial waste heat recovery system generating useful heat and refrigeration Koziol, J. and Banasiak, K. hTternational Journal of Energy Research, 2005, 29, (6), 485 497. The technical and economic analysis of the industrial waste heat recovery system, considering probabilistic distribution of the input data is presented. A prospect and rationality of the application of the waste heat boiler and absorption refrigerator has been examined as an example, in view of covering integrated heat and refrigeration demands. The influence of changing a m b i e n t conditions as well as the exhaust gas t e m p e r a t u r e and its flow rate on the overall system performance has been simulated and assessed.
06•01057 Thermodynamic optimization of a reheat chemically recuperated gas turbine Carapellucci, R. and Milazzo, A. Energy Conversion and Management, 2005, 46, (18 19), 2936 2953. The feasibility of integrating a commercially available r e h e a t gas turbine with a m e t h a n e steam reformer is analysed. A slight modification to the original r e h e a t design is proposed to improve the m e t h a n e conversion rate in the reforming process and, consequently, the efficiency in recovering waste exhaust heat from the gas turbine. Two solutions are proposed for the heat recovery scheme: a first reformer has a single pressure level while the second has two in order to match the different pressures of the combustors. W h i l e the single pressure scheme gives good performance with respect to the stand alone gas turbine, the dual pressure reformer can give a further benefit, as far as an accurate optimization of the s t e a m m a n a g e m e n t is performed.
06•01056 The impact of recycling of organic carbon on the stable carbon isotopic composition of dissolved inorganic carbon in a stratified marine system (Kyllaren fjord, Norway)
06•01058 Thermodynamic performance of a double-effect absorption heat-transformer using TFE/E181 as the working fluid
van Breugel, Y. et al. Organic Geochemistry, 2005, 36, (8), 1163 1173. A negative carbon isotope shift in sedimentary organic carbon deposited in stratified marine and lacustrine systems has often been inferred to be a consequence of the process of recycling of respired and, therefore, 13C-depleted, dissolved inorganic carbon (DIC) formed from mineralization of descending organic matter. To study this process, we m e a s u r e d b 13 C D I C and d 13 C values of particulate organic carbon (POC) over an a n n u a l cycle in the permanently stratified Kyllaren fjord in Norway. A notable a c c u m u l a t i o n of respired D I C below the chemocline was evident from the substantially 13C-depleted D I C (ca. 19%o). Especially in a u t u m n to early spring, respired D I C from the deep anoxic water is mixed into the oxygenated surface water and the calculated respired D I C contribution to the total D I C pool was up to ~ 4 0 % in early spring in the upper 2 m of the water column. A t 4 m depth, just below the chemocline, the respired D I C contribution reaches ca. 90% of the total D I C pool. A s s i m i l a t i o n of the respired D I C seems to exert only a small effect on 613CP°C, which has an average 613C value of 24%0. The measured p h o t o a u t o t r o p h i c fractionation (ep) was low ( < 10%o) during the majority of the year. This is likely responsible for reducing the a p p a r e n t impact of recycling of respired D I C on 613C p°C. However, in June 2002, p h o t o a u t o t r o p h i c use of the 13C-depleted D I C is obvious from a 13C-depletion of POC ( 33.7%0) derived from a b l o o m of the protist Euglena sp.
Zhao, Z. et al. Applied Energy, 2005, 82, (2), 107 116. T r i f l u o r o e t h a n o l ( T F E ) tetraethylenglycol d i m e t h y l e t h e r ( T E G D M E or E l 8 1 ) is a new organic working-pair which is non-corrosive, completely miscible and thermally stable up to 250:C. It is suitable for upgrading low-temperature level industrial w a s t e - h e a t to a higher t e m p e r a t u r e level for reuse. In this paper, the t h e r m o d y n a m i c performance of the double-effect absorption heat-transformer ( D E A H T ) using TFE/E181 as the working fluid is simulated, based on the t h e r m o d y n a m i c properties of TFE/E181 solution. The results show that, w h e n the t e m p e r a t u r e in the high-pressure generator exceeds 100:C and the gross t e m p e r a t u r e lift is 30:C, the coefficient of performance (COP) of the D E A H T is a b o u t 0.58, which is larger than the 0.48 of the single-stage absorption heat-transformer (SAHT), the increase of COP is about 20%,. But it is still less than 0.64 of the D E A H T using LiBr H 2 0 as the working fluid. Meanwhile, the C O P of the D E A H T decreases more rapidly with increases of the absorption t e m p e r a t u r e than that for the SAHT. The range of available gross temperature-lift for the D E A H T is narrower than that of the SAHT. The higher the t e m p e r a t u r e in the high-pressure generator, the larger the gross temperature-lift could be. So the double-effect absorption heat-transformer is more suitable for being applied in those circumstances of having a h i g h e r - t e m p e r a t u r e heat-resource and when a higher temperature-lift is not needed.
152
Fuel and Energy Abstracts
March 2006