The Experts below are selected from a list of 37389 Experts worldwide ranked by ideXlab platform
M De La Vega - One of the best experts on this subject based on the ideXlab platform.
-
performance of a libr water absorption chiller operating with plate heat exchangers
Energy Conversion and Management, 2006Co-Authors: M De La Vega, J A Almendrosibanez, Graciela Hoyos RuizAbstract:Abstract This paper studies the performance of a lithium bromide–water absorption chiller operating with plate heat exchangers (PHE). The overall heat transfer coefficients in the desorber, the condenser and the solution heat recoverer are calculated using the correlations provided in the literature for evaporation, condensation and liquid to liquid heat transfer in PHEs. The variable parameters are the external driving temperatures. In the desorber, the inlet temperature of the Hot Fluid ranges from 75 °C to 105 °C. In the condenser and the absorber, the inlet temperature of the cooling water goes from 20 °C to 40 °C. The coefficient of performance (COP) obtained ranges from 0.5 to 0.8 for cooling duties ranging from 2 kW to 12 kW. The chiller response to different Hot Fluid temperatures and circulated mass flow rates is also presented. The performance and the internal parameters of the chiller at part load are, therefore, calculated. A higher efficiency results when the solution pumped from the absorber to the desorber decreases. The heat transfer analysis of the PHEs is also presented. The overall heat transfer coefficient in the desorber, equal to 790 W/m 2 K at the design conditions, is also analysed at part load. The condenser performance can be represented by a similar relationship found in conventional air cooled condensers.
-
Performance of a LiBr-water absorption chiller operating with plate heat exchangers
Energy Conversion and Management, 2006Co-Authors: M De La Vega, José Antonio Almendros-ibáñez, G RuizAbstract:This paper studies the performance of a lithium bromide-water absorption chiller operating with plate heat exchangers (PHE). The overall heat transfer coefficients in the desorber, the condenser and the solution heat recoverer are calculated using the correlations provided in the literature for evaporation, condensation and liquid to liquid heat transfer in PHEs. The variable parameters are the external driving temperatures. In the desorber, the inlet temperature of the Hot Fluid ranges from 75 °C to 105 °C. In the condenser and the absorber, the inlet temperature of the cooling water goes from 20 °C to 40 °C. The coefficient of performance (COP) obtained ranges from 0.5 to 0.8 for cooling duties ranging from 2 kW to 12 kW. The chiller response to different Hot Fluid temperatures and circulated mass flow rates is also presented. The performance and the internal parameters of the chiller at part load are, therefore, calculated. A higher efficiency results when the solution pumped from the absorber to the desorber decreases. The heat transfer analysis of the PHEs is also presented. The overall heat transfer coefficient in the desorber, equal to 790 W/m2K at the design conditions, is also analysed at part load. The condenser performance can be represented by a similar relationship found in conventional air cooled condensers. © 2006 Elsevier Ltd. All rights reserved.
Christian Hensen - One of the best experts on this subject based on the ideXlab platform.
-
corrigendum to impact of Hot Fluid advection on hydrocarbon gas production and seepage in mud volcano sediments of thick cenozoic deltas earth planet sci lett 341 344 2012 139 157
Earth and Planetary Science Letters, 2012Co-Authors: Marianne Nuzzo, Marcus Elvert, Mark Schmidt, Florian Scholz, Anja Reitz, Kaiuwe Hinrichs, Christian HensenAbstract:Corrigendum to ‘‘Impact of Hot Fluid advection on hydrocarbon gas production and seepage in mud volcano sediments of thick Cenozoic deltas’’ [Earth Planet. Sci. Lett. 341–344 (2012) 139–157] Marianne Nuzzo , Marcus Elvert , Mark Schmidt , Florian Scholz , Anja Reitz , Kai-Uwe Hinrichs , Christian Hensen a a GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstrabe 1-3, D-24148 Kiel, Germany b Organic Geochemistry Group, Department of Geosciences and MARUM—Centre for Marine Environmental Sciences, University of Bremen, Leobener Str., D-28359 Bremen, Germany
-
impact of Hot Fluid advection on hydrocarbon gas production and seepage in mud volcano sediments of thick cenozoic deltas
Earth and Planetary Science Letters, 2012Co-Authors: Marianne Nuzzo, Marcus Elvert, Mark Schmidt, Florian Scholz, Anja Reitz, Kaiuwe Hinrichs, Christian HensenAbstract:Hydrocarbon seeps are ubiquitous at gas-prone Cenozoic deltas such as the Nile Deep Sea Fan (NDSF2) where seepage into the bottom water has been observed at several mud volcanoes (MVs3) including North Alex MV (NAMV4). Here we investigated the sources of hydrocarbon gases and sedimentary organic matter together with biomarkers of microbial activity at four locations of NAMV to constrain how venting at the seafloor relates to the generation of hydrocarbon gases in deeper sediments. At the centre, high upward flux of Hot (70 °C) hydrocarbon-rich Fluids is indicated by an absence of biomarkers of Anaerobic Oxidation of Methane (AOM) and nearly constant methane (CH4) concentration depth-profile. The presence of lipids of incompatible thermal maturities points to mixing between early-mature petroleum and immature organic matter, indicating that shallow mud has been mobilized by the influx of deep-sourced hydrocarbon-rich Fluids. Methane is enriched in the heavier isotopes, with values of δ13C∼−46.6‰VPDB and δD ∼−228‰VSMOW, and is associated with high amounts of heavier homologues (C2+) suggesting a co-genetic origin with the petroleum. On the contrary at the periphery, a lower but sustained CH4 flux is indicated by deeper sulphate–methane transition zones and the presence of 13C-depleted biomarkers of AOM, consistent with predominantly immature organic matter. Values of δ13C-CH4∼−60‰VPDB and decreased concentrations of 13C-enriched C2+ are typical of mixed microbial CH4 and biodegraded thermogenic gas from Plio-Pleistocene reservoirs of the region. The maturity of gas condensate migrated from pre-Miocene sources into Miocene reservoirs of the Western NDSF is higher than that of the gas vented at the centre of NAMV, supporting the hypothesis that it is rather released from the degradation of oil in Neogene reservoirs. Combined with the finding of Hot pore water and petroleum at the centre, our results suggest that clay mineral dehydration of Neogene sediments, which takes place posterior to reservoir filling, may contribute to intense gas generation at high sedimentation rate deltas.
Graciela Hoyos Ruiz - One of the best experts on this subject based on the ideXlab platform.
-
performance of a libr water absorption chiller operating with plate heat exchangers
Energy Conversion and Management, 2006Co-Authors: M De La Vega, J A Almendrosibanez, Graciela Hoyos RuizAbstract:Abstract This paper studies the performance of a lithium bromide–water absorption chiller operating with plate heat exchangers (PHE). The overall heat transfer coefficients in the desorber, the condenser and the solution heat recoverer are calculated using the correlations provided in the literature for evaporation, condensation and liquid to liquid heat transfer in PHEs. The variable parameters are the external driving temperatures. In the desorber, the inlet temperature of the Hot Fluid ranges from 75 °C to 105 °C. In the condenser and the absorber, the inlet temperature of the cooling water goes from 20 °C to 40 °C. The coefficient of performance (COP) obtained ranges from 0.5 to 0.8 for cooling duties ranging from 2 kW to 12 kW. The chiller response to different Hot Fluid temperatures and circulated mass flow rates is also presented. The performance and the internal parameters of the chiller at part load are, therefore, calculated. A higher efficiency results when the solution pumped from the absorber to the desorber decreases. The heat transfer analysis of the PHEs is also presented. The overall heat transfer coefficient in the desorber, equal to 790 W/m 2 K at the design conditions, is also analysed at part load. The condenser performance can be represented by a similar relationship found in conventional air cooled condensers.
G Ruiz - One of the best experts on this subject based on the ideXlab platform.
-
Performance of a LiBr-water absorption chiller operating with plate heat exchangers
Energy Conversion and Management, 2006Co-Authors: M De La Vega, José Antonio Almendros-ibáñez, G RuizAbstract:This paper studies the performance of a lithium bromide-water absorption chiller operating with plate heat exchangers (PHE). The overall heat transfer coefficients in the desorber, the condenser and the solution heat recoverer are calculated using the correlations provided in the literature for evaporation, condensation and liquid to liquid heat transfer in PHEs. The variable parameters are the external driving temperatures. In the desorber, the inlet temperature of the Hot Fluid ranges from 75 °C to 105 °C. In the condenser and the absorber, the inlet temperature of the cooling water goes from 20 °C to 40 °C. The coefficient of performance (COP) obtained ranges from 0.5 to 0.8 for cooling duties ranging from 2 kW to 12 kW. The chiller response to different Hot Fluid temperatures and circulated mass flow rates is also presented. The performance and the internal parameters of the chiller at part load are, therefore, calculated. A higher efficiency results when the solution pumped from the absorber to the desorber decreases. The heat transfer analysis of the PHEs is also presented. The overall heat transfer coefficient in the desorber, equal to 790 W/m2K at the design conditions, is also analysed at part load. The condenser performance can be represented by a similar relationship found in conventional air cooled condensers. © 2006 Elsevier Ltd. All rights reserved.
Marianne Nuzzo - One of the best experts on this subject based on the ideXlab platform.
-
corrigendum to impact of Hot Fluid advection on hydrocarbon gas production and seepage in mud volcano sediments of thick cenozoic deltas earth planet sci lett 341 344 2012 139 157
Earth and Planetary Science Letters, 2012Co-Authors: Marianne Nuzzo, Marcus Elvert, Mark Schmidt, Florian Scholz, Anja Reitz, Kaiuwe Hinrichs, Christian HensenAbstract:Corrigendum to ‘‘Impact of Hot Fluid advection on hydrocarbon gas production and seepage in mud volcano sediments of thick Cenozoic deltas’’ [Earth Planet. Sci. Lett. 341–344 (2012) 139–157] Marianne Nuzzo , Marcus Elvert , Mark Schmidt , Florian Scholz , Anja Reitz , Kai-Uwe Hinrichs , Christian Hensen a a GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstrabe 1-3, D-24148 Kiel, Germany b Organic Geochemistry Group, Department of Geosciences and MARUM—Centre for Marine Environmental Sciences, University of Bremen, Leobener Str., D-28359 Bremen, Germany
-
impact of Hot Fluid advection on hydrocarbon gas production and seepage in mud volcano sediments of thick cenozoic deltas
Earth and Planetary Science Letters, 2012Co-Authors: Marianne Nuzzo, Marcus Elvert, Mark Schmidt, Florian Scholz, Anja Reitz, Kaiuwe Hinrichs, Christian HensenAbstract:Hydrocarbon seeps are ubiquitous at gas-prone Cenozoic deltas such as the Nile Deep Sea Fan (NDSF2) where seepage into the bottom water has been observed at several mud volcanoes (MVs3) including North Alex MV (NAMV4). Here we investigated the sources of hydrocarbon gases and sedimentary organic matter together with biomarkers of microbial activity at four locations of NAMV to constrain how venting at the seafloor relates to the generation of hydrocarbon gases in deeper sediments. At the centre, high upward flux of Hot (70 °C) hydrocarbon-rich Fluids is indicated by an absence of biomarkers of Anaerobic Oxidation of Methane (AOM) and nearly constant methane (CH4) concentration depth-profile. The presence of lipids of incompatible thermal maturities points to mixing between early-mature petroleum and immature organic matter, indicating that shallow mud has been mobilized by the influx of deep-sourced hydrocarbon-rich Fluids. Methane is enriched in the heavier isotopes, with values of δ13C∼−46.6‰VPDB and δD ∼−228‰VSMOW, and is associated with high amounts of heavier homologues (C2+) suggesting a co-genetic origin with the petroleum. On the contrary at the periphery, a lower but sustained CH4 flux is indicated by deeper sulphate–methane transition zones and the presence of 13C-depleted biomarkers of AOM, consistent with predominantly immature organic matter. Values of δ13C-CH4∼−60‰VPDB and decreased concentrations of 13C-enriched C2+ are typical of mixed microbial CH4 and biodegraded thermogenic gas from Plio-Pleistocene reservoirs of the region. The maturity of gas condensate migrated from pre-Miocene sources into Miocene reservoirs of the Western NDSF is higher than that of the gas vented at the centre of NAMV, supporting the hypothesis that it is rather released from the degradation of oil in Neogene reservoirs. Combined with the finding of Hot pore water and petroleum at the centre, our results suggest that clay mineral dehydration of Neogene sediments, which takes place posterior to reservoir filling, may contribute to intense gas generation at high sedimentation rate deltas.