Relevant bibliographies by topics / Carbon dioxide flux

Academic literature on the topic 'Carbon dioxide flux'

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Published: 4 June 2021
Last updated: 28 January 2023

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Journal articles on the topic "Carbon dioxide flux"

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Liang, Zhan Qi, Dan Shan, Hao Rong, and En De Xing. "The Study of Carbon Dioxide Flux on Xilamuren Grassland Based on the Eddy Covariance Technique." Applied Mechanics and Materials 209-211 (October 2012): 1162–65. http://dx.doi.org/10.4028/www.scientific.net/amm.209-211.1162.

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The eddy covariance is a micrometeorological technique to observe and investigate ecosystem flux nondestructively, as well as the main method the eddy covariance may help to research carbon dioxide exchange between global vegetations and the atmosphere. Carbon dioxide flux has been monitored on Xilamuren grassland of Wulanchabu city by Open Path Eddy Covariance System (OP-2). Carbon dioxide flux shows that carbon absorption is greater than its release, which has an evident carbon sink functions and obvious seasonal variety on the basis of experimental data from June 2009 to July 2011.
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Parkin, Timothy B., and Thomas C. Kaspar. "Temperature Controls on Diurnal Carbon Dioxide Flux." Soil Science Society of America Journal 67, no. 6 (November 2003): 1763–72. http://dx.doi.org/10.2136/sssaj2003.1763.

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Parkin, Timothy B., and Thomas C. Kaspar. "Temporal Variability of Soil Carbon Dioxide Flux." Soil Science Society of America Journal 68, no. 4 (July 2004): 1234–41. http://dx.doi.org/10.2136/sssaj2004.1234.

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Wuest, Stewart B., Daniel Durr, and Stephan L. Albrecht. "Carbon Dioxide Flux Measurement During Simulated Tillage." Agronomy Journal 95, no. 3 (2003): 715. http://dx.doi.org/10.2134/agronj2003.0715.

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Wuest, Stewart B., Daniel Durr, and Stephan L. Albrecht. "Carbon Dioxide Flux Measurement During Simulated Tillage." Agronomy Journal 95, no. 3 (May 2003): 715–18. http://dx.doi.org/10.2134/agronj2003.7150.

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Riederer, M., A. Serafimovich, and T. Foken. "Net ecosystem CO<sub>2</sub> exchange measurements by the closed chamber method and the eddy covariance technique and their dependence on atmospheric conditions." Atmospheric Measurement Techniques 7, no. 4 (April 25, 2014): 1057–64. http://dx.doi.org/10.5194/amt-7-1057-2014.

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Abstract. Carbon dioxide flux measurements in ecosystem sciences are mostly conducted by eddy covariance technique or the closed chamber method. But there is a lack of detailed comparisons that assess present differences and uncertainties. To determine underlying processes, a 10-day, side-by-side measurement of the net ecosystem exchange with both techniques was evaluated with regard to various atmospheric conditions during the diurnal cycle. It was found that, depending on the particular atmospheric condition, the chamber carbon dioxide flux was either (i) equal to the carbon dioxide flux measured by the reference method eddy covariance, by day with well-developed atmospheric turbulence; (ii) higher, in the afternoon in times of oasis effect; (iii) lower, predominantly at night while large coherent structure fluxes or high wind velocities prevailed; or (iv) showed less variation in the flux pattern, at night while stable stratification was present. At night – when respiration forms the net ecosystem exchange – lower chamber carbon dioxide fluxes were found. In the afternoon – when the ecosystem is still a net carbon sink – the carbon dioxide fluxes measured by the chamber prevailed. These two complementary aspects resulted in an overestimation of the ecosystem sink capacity by the chamber of 40% in this study.
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Riederer, M., A. Serafimovich, and T. Foken. "Net ecosystem CO<sub>2</sub> exchange measurements by the closed chamber method and the eddy covariance technique and their dependence on atmospheric conditions – a case study." Atmospheric Measurement Techniques Discussions 6, no. 5 (October 7, 2013): 8783–805. http://dx.doi.org/10.5194/amtd-6-8783-2013.

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Abstract. Carbon dioxide flux measurements in ecosystem sciences are mostly conducted by eddy covariance technique or the closed chamber method. Also some comparisons have been performed. But there is a lack of detailed assessment of present differences and uncertainties. To determine underlying processes, a ten-day, side-by-side measurement of the net ecosystem exchange with both techniques was evaluated with regard to various atmospheric conditions during the diurnal cycle. It was found that, depending on the particular atmospheric condition, the chamber carbon dioxide flux was either: (i) equal to the carbon dioxide flux measured by the reference method eddy covariance, by day with well developed atmospheric turbulence, (ii) higher, in the afternoon in times of oasis effect, (iii) lower, predominantly at night while large coherent structure fluxes or high wind velocities prevailed, or, (iv) showed less variation in the flux pattern, at night while stable stratification was present. Due to lower chamber carbon dioxide fluxes at night, when respiration forms the net ecosystem exchange, and higher chamber carbon dioxide fluxes in the afternoon, when the ecosystem is still a net carbon sink, there are two complementary aspects resulting in an overestimation of the ecosystem sink capacity by the chamber of 40% in this study.
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Kessler, Toby J., and Charles F. Harvey. "The global flux of carbon dioxide into groundwater." Geophysical Research Letters 28, no. 2 (January 15, 2001): 279–82. http://dx.doi.org/10.1029/2000gl011505.

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McGillis, Wade R., James B. Edson, Jonathan D. Ware, John W. H. Dacey, Jeffrey E. Hare, Christopher W. Fairall, and Rik Wanninkhof. "Carbon dioxide flux techniques performed during GasEx-98." Marine Chemistry 75, no. 4 (September 2001): 267–80. http://dx.doi.org/10.1016/s0304-4203(01)00042-1.

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Golley, Frank, Sanne Bakker, and Toshihide Hamazaki. "Carbon dioxide flux across a forest-field ecotone." Environmental Monitoring and Assessment 22, no. 2 (August 1992): 117–22. http://dx.doi.org/10.1007/bf00418010.

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Dissertations / Theses on the topic "Carbon dioxide flux"

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Kessler, Toby Jonathan 1974. "Calculating the global flux of carbon dioxide into groundwater." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/54439.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1999.
Includes bibliographical references (leaves 85-90).
In this research, the global annual flux of inorganic carbon into groundwater was calculated to be 4.4 GtC/y, with a lower bound of 1.4 GtC/y and an upper bound of 27.5 GtC/y. Starting with 44 soil PCO2 measurements, the dissolved inorganic carbon (DIC) of the groundwater was determined by equilibrium equations for the carbonate system. The calculated DIC was then multiplied by the groundwater recharge to determine the annual carbon flux per area. These PCO2 estimates were assigned to specific bio-temperatures and precipitations according to the Holdridge life-zone classification system, and regressions between PCO2, biotemperature, and precipitation were used to provide estimates for regions of the world that lacked PCO2 measurements. The fluxes were mapped on a generalized Holdridge life-zone map, and the total flux for each life-zone was found by multiplying the calculated flux by the area in each life-zone. While there was a wide range in the error, the calculations in this study strongly suggest that the flux of carbon into groundwater is comparable to many of the major fluxes that have been tabulated for the carbon cycle. The large flux that was calculated in this study was due to the high PCO2 that is common in soils. The elevated PCO2 levels are due to the decomposition of organic matter in soils, and the absorption of oxygen by plant roots. After the groundwater enters into rivers, it is possible that large amounts of CO2 is released from the surface of rives, as the carbon-rich waters re-equilibrate with the low atmospheric PCO2-
by Toby Jonathan Kessler.
S.M.
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Conlin, Molly R. "Soil hydroclimate, vegetation, and substrate controls on carbon flux in an Alaskan fen." Diss., Connect to online resource - MSU authorized users, 2008.

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Thesis (M.S.)--Michigan State University. Dept. of Plant Biology Ecology, Evolutionary Biology, and Behavior, 2008.
The direct goal of this thesis is determine the effect of expermental soil climate manipulatoins on carbon fluxes in an Alaskan rich fen and to assess the indirect influence of substrate quality on carbon mineralizaton rates in peat--From abstract. Title from PDF t.p. (viewed on July 29, 2009) Includes bibliographical references. Also issued in print.
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Yang, Paul Chenggang. "Carbon dioxide flux within and above a boreal aspen forest." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0027/NQ34647.pdf.

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Austin, Lydia B. "The feasibility of using airborne carbon dioxide flux measurements for imaging the rate of biomass production /." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65452.

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Holifield, Collins Chandra. "Mapping Carbon Dioxide Flux in Semiarid Grasslands Using Optical Remote Sensing." Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/196083.

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Increasing atmospheric levels of carbon dioxide (CO2) and the potential impact on climate change has caused an increased effort to more accurately quantify terrestrial sources and sinks. Semiarid grasslands cover a significant portion of the Earth's land surface and may be an important sink for atmospheric CO2. This study was conducted to examine the role semiarid grasslands play in the carbon cycle. The relation between surface reflectance and temperature obtained from satellite imagery was used to determine a Water Deficit Index (WDI) to estimate distributed plant transpiration rates for a point in time. Due to the relationship between transpiration and plant CO2 uptake, WDI was directly related to CO2 flux. Satellite images were acquired for a five-year period (1996-2000) during which transpiration and net CO2 flux were measured for a semiarid grassland site in southeastern Arizona. Manual and automatic chamber data were also collected in 2005 and 2006 and used to assess the spatial variability of nighttime soil respiration. Spatial analysis showed the most influential factor affecting nighttime respiration was aspect, where flux from North-facing slopes was significantly (P < 0.05) higher than on South-facing slopes. A strong linear relationship (R2 = 0.97) existed between WDI-derived instantaneous net CO2 flux and daytime net CO2 flux estimates, and was used to generate maps of distributed daytime net CO2 flux. A linear relationship (R2 = 0.88) was also found between daytime and nighttime net CO2 flux, and used in combination with maps of daytime net CO2 flux to create maps of daily net CO2 flux. This study indicated that remote sensing offers an operational, physically-based means of obtaining daily net CO2 flux in semiarid grasslands.
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Velasco, Saldaña Hector Erik. "Urban flux and concentration measurements of volatile organic compounds and CO₂ in Mexico City." Online access for everyone, 2005. http://www.dissertations.wsu.edu/Dissertations/Fall2005/h%5Fvelasco%5F121305.pdf.

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McLaren, Alison Jane. "The influence of ocean dynamics on the air-sea flux of carbon dioxide and nutrient transport." Thesis, University of Liverpool, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367190.

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Bloomberg, Simon. "Looking for Permeability: Mass and Heat Flow Assessment Using High Resolution soil CO₂Flux Surveys within the Taupo Volcanic Zone, New Zealand." Thesis, University of Canterbury. Geological Sciences, 2012. http://hdl.handle.net/10092/7436.

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Soil CO2 flux (φCO₂) has increasingly become important as a global exploration and monitoring tool in geothermal and volcanic fields. As CO₂ is the second most abundant gas in magma-hydrothermal systems, its study is vital for the location or management of those systems. Often one of the only surface expressions is the diffuse gas flux streaming through the soil zone. This thesis reports the investigations into heat and mass at the Rotokawa geothermal field’s thermal area, and White Island volcano’s crater floor hydrothermal system. Surface measurements were taken at high spatial resolution across the fields in a large sampling campaign during the summers of 2010/2011 and 2011/2012. A large dataset was built up which allowed for greater accuracy during geospatial modelling. The models are 2d pixel plots of the soil gas flux and temperature and are used to estimate values of heat and mass flow for the respective magma-hydrothermal systems. Both field areas have a large anomalous diffuse gas flux through the soil zone and related conductive heat flow anomaly, which indicates relative permeability from the source to the surface in these areas. That the rising fluids from the deep source can be sampled at the surface simply is a powerful tool for the exploration and management of these systems. Rotokawa has a diffuse gas release of over 600 t d⁻¹ and an associated heat flow through soil of 37 MWt while White Island has a diffuse gas release of 116 t d⁻¹ and 19.5 MWt of heat flow through the soil. Translating these values to total heat and mass flow values: Rotokawa has a mass flow 125 kg s⁻¹ and a heat flow of 314 MWt and White Island’s crater floor has a mass flow of 100 kg s⁻¹ and a heat flow of 22 MWt. Fluid flow pathways are mapped from the surface and show arcuate and hot spot spatiality, controlled by fault related permeability and structure. soil gas and temperature surveying elucidates Shallow structures that otherwise may have been hidden from status quo surface mapping. The method used in this study is applicable to both known thermal areas and blind thermal areas by addressing not only the flux but also the nature of the soil gases. Further study of White Island has found more evidence for the existence of seawater infiltration of the crater magma-hydrothermal system.
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Treat, Claire Clark. "Interannual and seasonal variation of methane flux from a temperate peatland and possible environmental controls /." Connect to online version, 2005. http://ada.mtholyoke.edu/setr/websrc/pdfs/www/2005/101.pdf.

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DeLacy, Brendan G. Bandy A. R. "The determination of carbon dioxide flux in the atmosphere using atmospheric pressure ionization mass spectrometry and isotopic dilution /." Philadelphia, Pa. : Drexel University, 2006. http://dspace.library.drexel.edu/handle/1860%20/868.

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Books on the topic "Carbon dioxide flux"

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Sugimoto, Hiroyuki. A method forestimating the sea-air CO2 flux in the Pacific Ocean. Tsukuba-shi: Meteorological Research Institute, 2012.

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Knoepp, Jennifer D. Quantitative comparison of in situ soil CO₂ flux measurement methods. Asheville, NC: U.S. Dept. of Agriculture, Forest Service, Southern Research Station, 2002.

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Park, Geun-Ha. Procedures to create near real-time seasonal air-sea CO₂ flux maps. Miami, Fla: United States Dept. of Commerce, National Oceanic and Atmospheric Administration, Office of Oceanic and Atmospheric Research, 2010.

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Crawford, G. B. On the contribution of bubbles and waves to air-sea COb2s flux, with implications for remote sensing. Boulder, Colo: National Oceanic and Atmospheric Administration, Environmental Research Laboratories, 1987.

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Preiss, David Alan. A new method for measurement of carbon dioxide flux in the lungs during breathing. Ottawa: National Library of Canada, 2003.

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Savage, Kathleen. BOREAS TGB-1 [i.e. TGB-3] CH4 and CO2 chamber flux data over NSA upland sites. Greenbelt, Md: NASA Goddard Space Flight Center, 2000.

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Savage, Kathleen. BOREAS TGB-1 [i.e. TGB-3] CH4 and CO2 chamber flux data over NSA upland sites. Greenbelt, Md: NASA Goddard Space Flight Center, 2000.

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Carbon dioxide removal from coal-fired power plants. Dordrecht [Netherlands]: Kluwer Academic Publishers, 1994.

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Oxy-fuel combustion for power generation and carbon dioxide (CO2) capture. Oxford: Woodhead Pub., 2011.

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Anthoni, Peter M. Carbon dioxide eddy flux measurements in complex terrain from a coniferous forest under the influence of marine air. 1996.

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Book chapters on the topic "Carbon dioxide flux"

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Paulev, Poul-Erik, Yoshimi Miyamoto, Michael John Mussell, and Kyuichi Niizeki. "Humoral Aspects of the Ventilatory Reactions to Exercise by Flux Inhalation of Carbon Dioxide." In Control of Breathing and Its Modeling Perspective, 267–70. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4757-9847-0_45.

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Lorenz, Robert, and Charles E. Murphy. "Sulfur Dioxide, Carbon Dioxide, and Water Vapor Flux Measurements Utilizing a Microprocessor-Controlled Data Acquisition System in A Pine Plantation." In The Forest-Atmosphere Interaction, 133–47. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5305-5_9.

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Adams, Donald D. "Diffuse Flux of Greenhouse Gases — Methane and Carbon Dioxide — at the Sediment-Water Interface of Some Lakes and Reservoirs of the World." In Greenhouse Gas Emissions — Fluxes and Processes, 129–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/978-3-540-26643-3_6.

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Chiang, Pen-Chi, and Shu-Yuan Pan. "Carbon Capture with Flue Gas Purification." In Carbon Dioxide Mineralization and Utilization, 337–59. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3268-4_17.

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Xu, Jin, Nan Wang, Min Chen, and Haiyang Yu. "Recycling of Blast Furnace Flue Dust with In-flight Reduction Technology: Reduction Behavior and Kinetic Analysis." In Energy Technology 2020: Recycling, Carbon Dioxide Management, and Other Technologies, 365–76. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-36830-2_35.

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Ahmad, A. L., Y. O. Salaudeen, and Z. A. Jawad. "Polymeric Membrane for Flue Gas Separation and Other Minor Components in Carbon Dioxide Capture." In Membrane Technology for CO2 Sequestration and Separation, 39–73. Boca Raton, FL : CRC Press, Taylor & Francis Group, [2018] | “A science publishers book.”: CRC Press, 2019. http://dx.doi.org/10.1201/b22409-3.

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Hendriks, Chris. "Carbon dioxide recovery from flue gases of a conventional coal-fired power plant using polymer membranes." In Energy & Environment, 51–81. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0301-5_3.

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He, Lijuan, Jieqiong Li, Lifeng Chen, Yanling Ni, Gangyi Xu, Yuxiang Zhang, and Wenfei Wu. "Experimental Study on Efficient Absorption of Carbon Dioxide from Simulation Flue Gas by Rotary Packed Bed." In Cleaner Combustion and Sustainable World, 1347–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-30445-3_178.

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Chue, Kuck-Tack, Jong-Nam Kim, Yun-Jong Yoo, Soon-Haeng Cho, and Kyo-Shik Park. "A Parametric Study of Pressure Swing Adsorption for the Recovery of Carbon Dioxide from Flue Gas." In The Kluwer International Series in Engineering and Computer Science, 203–10. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-1375-5_24.

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Hendriks, Chris. "Carbon dioxide recovery from flue gases of a conventional coal-fired power plant by low-temperature distillation." In Energy & Environment, 83–108. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0301-5_4.

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Conference papers on the topic "Carbon dioxide flux"

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Hihara, Eiji, and Chaobin Dang. "Boiling Heat Transfer of Carbon Dioxide in Horizontal Tubes." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32885.

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In this study, boiling heat transfer coefficients of carbon dioxide in horizontally located smooth tubes were experimentally investigated. The inner diameter of heat transfer tubes was 1, 2, 4, and 6 mm. Experiments were conducted at evaporating temperature of 5 and 15 °C, heat fluxes from 4.5 to 36 kW/m2, and mass fluxes from 360 to 1440 kg/m2s. The heat transfer coefficients in the pre-dryout region and post-dryout region were investigated, as well as the dryout quality. Due to the small viscosity and surface tension of CO2, the dryout occurs at a small quality from 0.4 to 0.7. The inception quality decreases with the increase of mass flux, and is affected by the heat flux and tube diameter; the effects of heat flux on the heat transfer coefficient are much significant in the pre-dryout region, which is related with the activation of nucleate boiling. On the contrary, the effects of mass flux are relatively low due to the low two-phase density ratio near the critical point. In addition, this tendency becomes more significant when the small tube is tested; In the post-dryout region, mass velocity is the dominating factor on heat transfer coefficient. At small mass flux, the heat transfer coefficient decreases with the increase of quality, while at large mass flux such as 1440kg/m2s, the heat transfer coefficient turns to increasing with the quality. By increasing the evaporating temperature, the pre-dryout heat transfer coefficient increases, while the dryout inception quality and post-dryout heat transfer coefficient are not affected greatly by the evaporating temperature.
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L’Estrange, Thomas, Eric Truong, Charles Rymal, Erfan Rasouli, Vinod Narayanan, Sourabh Apte, and Kevin Drost. "High Flux Microscale Solar Thermal Receiver for Supercritical Carbon Dioxide Cycles." In ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/icnmm2015-48233.

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Characterization of a microchannel solar thermal receiver for a supercritical carbon dioxide (sCO2) is presented. The receiver design is based on conjugate computational fluid dynamics and heat transfer simulations as well as thermo-mechanical stress analysis. Two receivers are fabricated and experimentally characterized — a parallel microchannel design and a microscale pin fin array design. Lab-scale experiments have been used to demonstrate the receiver integrity at the design pressure of 125 bar at 750°C surface temperature. A concentrated solar simulator was designed and assembled to characterize the thermal performance of the lab scale receiver test articles. Results indicate that, for a fixed exit fluid temperature of 650°C, increase in incident heat flux results in an increase in receiver and thermal efficiency. At a fixed heat flux, efficiency decreased with an increase in receiver surface temperature. The ability to absorb flux of up to 100 W/cm2 at thermal efficiency in excess of 90 percent and exit fluid temperature of 650°C using the microchannel receiver is demonstrated. Pressure drop for the pin array at the maximum flow rate for heat transfer experiments is less than 0.64 percent of line pressure.
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Pidaparti, Sandeep, Dorrin Jarahbashi, Mark Anderson, and Devesh Ranjan. "Unusual Heat Transfer Characteristics of Supercritical Carbon Dioxide." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51225.

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Heat transfer mechanisms in supercritical fluids is quite different due to the fact that the thermophysical properties vary drastically within a span of few degrees Celsius near the critical point. A series of integral experiments were performed to investigate the unusual turbulent heat transfer characteristics of supercritical carbon dioxide flow in round tubes under heating conditions. Wall temperatures were measured over a range of experimental parameters that varied fluid inlet temperature from 20° C to 60° C, operating pressure from 7.5 to 10.2 MPa, mass flux from 100 to 1000 kg/m2-sec and a maximum heat flux of 100 KW/m2. Measurements were made for horizontal, upward, and downward flow to study the effects of buoyancy and flow acceleration caused by large variation in density. Existing criteria to predict the influence of buoyancy suggested that the experimental data can be classified into three regimes, namely normal, deteriorated, and enhanced heat transfer. Localized deterioration in heat transfer was characterized by a sharp increase in wall temperature and observed mainly in the case of upward flow due to reduction in the turbulent shear stress. Enhanced heat transfer regime was characterized by smooth variation in wall temperature and observed in the case of downward flow due to increase in the turbulent shear stress. Flow stratification occurred in horizontal flow resulting in a circumferential variation in wall temperature. Thermocouples mounted 180° apart on the tube revealed that wall temperatures on the top side are significantly higher than the bottom side of the tube. When the bulk temperature is much higher than the pseudocritical temperature, normal heat transfer was observed for all three tube orientations indicating that the buoyancy effects were negligible. Deterioration and enhancement in heat transfer were also observed in downward and upward cases respectively due to the flow acceleration effects. This occurred in the cases where outlet fluid density was much lower than the inlet fluid density causing the flow to accelerate. In the case of upward flow, this acceleration enhanced the turbulent shear stress and heat transfer. The large experimental database was used to evaluate the existing popular heat transfer correlations for supercritical fluids.
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Rymal, Charles J., Sourabh V. Apte, Vinod Narayanan, and Kevin Drost. "Numerical Design of a Planar High-Flux Microchannel Solar Receiver." In ASME 2014 8th International Conference on Energy Sustainability collocated with the ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/es2014-6637.

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This paper discuses the design of several micro-channel solar receiver devices. Due to enhanced heat transfer in micro-channels, these devices can achieve a higher surface efficiency than current receiver technology, leading to an increase in overall plant efficiency. The goal is to design an efficient solar receiver based on use of super-critical carbon-dioxide and molten salt as heat-transfer fluids. The super-critical Brayton cycle has shown potential for a higher efficiency than current power cycles used in CSP. Molten salt has been used in CSP applications in the past. The required inlet and outlet temperatures of the fluid are 773.15 K and 923.15 K for carbon-dioxide and 573.15 K and 873.15 K for molten salt. These temperature values are determined by the power cycles the devices are designed to operate in. The required maximum pressure drop is 0.35 bar for carbon-dioxide and 1 bar for molten salt. These pressure values are intended to be a practical goal for maximum pressure drop. The super-critical carbon-dioxide power cycle requires an operating pressure of is 120 bar. Finally, each device must withstand any mechanical and thermal stresses that may exist. Devices presented range in size from 1 cm2 to 4 cm2 and in heat transfer rates from 200 W to 400 W. The size of the device is based on the output capacity of the solar simulator which will be used for testing. For carbon-dioxide, three designs were developed with varying manufacturability. The low risk design features machined and welded parts and straight parallel channels. The medium risk design features machined and diffusion bonded parts and straight parallel channels. The high risk design features a circular micro-pin-fin array created using EDM and is constructed using diffusion bonding. The absence of high operating pressure for molten salt made structural design much easier than for carbon-dioxide. Conjugate heat-transfer simulations of each design were used to evaluate pressure drop, receiver efficiency, and flow distribution. Two and three dimensional structural analyses were used to ensure that the devices would withstand the mechanical and thermal stresses. Based on the numerical analyses, a receiver efficiency of 89.7% with a pressure drop of 0.2 bar were achieved for carbon-dioxide. The design was found to have a structural safety factor of 1.3 based maximum mechanical stress occurring in the headers. For molten salt, an efficiency of 92.1% was achieved with a pressure drop of 0.5 bar.
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Ortega, Jesus D., Sagar D. Khivsara, Joshua M. Christian, and Clifford K. Ho. "Design Requirements for Direct Supercritical Carbon Dioxide Receiver Development and Testing." In ASME 2015 9th International Conference on Energy Sustainability collocated with the ASME 2015 Power Conference, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/es2015-49489.

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This paper establishes the design requirements for the development and testing of direct supercritical carbon dioxide (sCO2) solar receivers. Current design considerations are based on the ASME Boiler and Pressure Vessel Code (BPVC). Section I (BPVC) considers typical boilers/superheaters (i.e. fired pressure vessels) which work under a constant low heat flux. Section VIII (BPVC) considers pressure vessels with operating pressures above 15 psig [2 bar] (i.e. unfired pressure vessels). Section III, Division I – Subsection NH (BPVC) considers a more detailed stress calculation, compared to Section I and Section VIII, and requires a creep-fatigue analysis. The main drawback from using the BPVC exclusively is the large safety requirements developed for nuclear power applications. As a result, a new set of requirements is needed to perform detailed thermal-structural analyses of solar thermal receivers subjected to a spatially-varying, high-intensity heat flux. The last design requirements document of this kind was an interim Sandia report developed in 1979 (SAND79-8183), but it only addresses some of the technical challenges in early-stage steam and molten-salt solar receivers but not the use of sCO2 receivers. This paper presents a combination of the ASME BPVC and ASME B31.1 Code modified appropriately to achieve the reliability requirements in sCO2 solar power systems. There are five main categories in this requirements document: Operation and Safety, Materials and Manufacturing, Instrumentation, Maintenance and Environmental, and General requirements. This paper also includes the modeling guidelines and input parameters required in computational fluid dynamics and structural analyses utilizing ANSYS Fluent, ANSYS Mechanical, and nCode Design Life. The main purpose of this document is to serve as a reference and guideline for design and testing requirements, as well as to address the technical challenges and provide initial parameters for the computational models that will be employed for the development of sCO2 receivers.
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Kifner, Lydia H., Aria Amirbahman, Aram Calhoun, and Stephen A. Norton. "IDENTIFYING ENVIRONMENTAL PREDICTORS AND QUANTIFYING METHANE AND CARBON DIOXIDE FLUX FROM FOUR VERNAL POOLS, MAINE USA." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-305369.

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Parahovnik, Anatoly, Mostafa Asadzadeh, and Yoav Peles. "Near Critical Carbon Dioxide Characteristics of Heat Transfer Processes in Microchannels." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10045.

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Abstract Convective heat transfer of CO2 flows near the critical condition in a 300 μm hydraulic diameter microchannel was visualized and measured. Flow patterns of the gas, liquid, and supercritical phases are presented and discussed. An experimental rig and a microfluidic device were designed and constructed to enable precise control and measurements of temperature, pressure, and mass flux. Heaters and resistive temperature detectors (RTDs) were formed on the microchannel wall to provide heating power and to measure local surface temperature. Flow patterns for the near-critical condition of CO2 were visualized, and local heat transfer coefficient (HTC) of 4.5, 6.1, and 150 kW/m2K were measured, for gas supercritical and liquid cases, respectively. It was observed that there is a distinct difference in flow and heat transfer patterns of different phases near the critical point, which leads to the deviation of the HTC. Also, CO2 presents high HTC coefficients for supercritical and boiling conditions that make it a viable option as thermal fluid for different micro scale applications.
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Verdi, Leonardo, Marco Napoli, Margherita Santoni, Anna Dalla Marta, and Maria Teresa Ceccherini. "Soil carbon dioxide emission flux from organic and conventional farming in a long term experiment in Tuscany." In 2019 IEEE International Workshop on Metrology for Agriculture and Forestry (MetroAgriFor). IEEE, 2019. http://dx.doi.org/10.1109/metroagrifor.2019.8909242.

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9

Sheng-hui, Liu, Huang Yan-ping, Liu Guang-xu, and Wang Jun-feng. "Numerical Investigation of Buoyancy Effect on Forced Convective Heat Transfer to Supercritical Carbon Dioxide Flowing in a Heated Tube." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-81450.

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Numerical investigation of buoyancy effect on forced convective heat transfer to supercritical carbon dioxide flowing in a vertical tube was carried out. When the mass flux is low and wall heat flux high, it shows that the buoyancy effect is obvious, which might redistribute the radial and axial velocity, even M shaped distribution in the radial direction. When the zero-velocity-gradient region corresponding to the M shaped velocity distribution appears in the edge of viscous layer, the production and diffusion of eddy will be weakened, resulting in heat transfer deterioration. According to the extended simulations based on experimental data, reducing the wall heat flux, adding the mass flux or raising the inlet temperature can relieve the deterioration of heat transfer caused by buoyancy effect.
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Jeong, Siyoung, Dongho Park, Dae-Hwan Kim, and Byung-Jun Min. "Effect of Charging Amount on Evaporative Heat Transfer of CO2 in a Multi-Channel Micro Tube." In ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2008. http://dx.doi.org/10.1115/icnmm2008-62104.

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Carbon dioxide has gained a great interest as a promising alternative natural refrigerant due to good thermodynamic characteristics. One of the most important factors in applying micro tube to carbon dioxide refrigeration system is refrigerant distribution. In this paper, evaporating heat transfer characteristics were experimentally investigated relating the charge of carbon dioxide in a multi-channel micro tube. The heat transfer coefficient and the pressure drop of the 6-channel aluminum tube were measured at various charges. It was found that the dryout quality and heat transfer coefficient were heavily dependent on the maldistribution of carbon dioxide. If the charge of CO2 was not enough, maldistribution in the multichannel micro tube became serious and a sudden drop of heat transfer coefficient was observed. These phenomena were conspicuous at high mass flux of CO2. Also, the pressure drop was greater if the CO2 was not properly distributed.
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Reports on the topic "Carbon dioxide flux"

1

Fischer, M. Carbon Dioxide Flux Measurement Systems (CO2Flux) Handbook. Office of Scientific and Technical Information (OSTI), January 2005. http://dx.doi.org/10.2172/1020279.

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2

Lopez-Coto, Israel, Kuldeep Prasad, and James R. Whetstone. Carbon dioxide biogenic vs anthropogenic sectoral contribution for the Indianapolis Flux Experiment (INFLUX). Gaithersburg, MD: National Institute of Standards and Technology, January 2019. http://dx.doi.org/10.6028/nist.sp.1237.

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Mazzi, Jessica. The Impact of Drought on the Sierra Nevada Range: Using Remote Sensing Data to Estimate Large-Scale Carbon Dioxide Flux. Portland State University Library, January 2016. http://dx.doi.org/10.15760/honors.229.

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Chipman, D. W., and T. Takahashi. Determination of ocean/atmosphere carbon dioxide flux within OMP survey area. Final technical progress report, June, 1 1993--May 31, 1995. Office of Scientific and Technical Information (OSTI), October 1995. http://dx.doi.org/10.2172/402381.

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Liang Hu. Carbon Dioxide Separation from Flue Gas by Phase Enhanced Absorption. Office of Scientific and Technical Information (OSTI), June 2006. http://dx.doi.org/10.2172/901079.

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David A. Green, Thomas O. Nelson, Brian S. Turk, Paul D. Box, and Raghubir P. Gupta. Carbon Dioxide Capture from Flue Gas Using Dry, Regenerable Sorbents. Office of Scientific and Technical Information (OSTI), March 2006. http://dx.doi.org/10.2172/895490.

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David A. Green, Thomas O. Nelson, Brian S. Turk, and Paul D. Box Raghubir P. Gupta. Carbon Dioxide Capture from Flue Gas Using Dry, Regenerable Sorbents. Office of Scientific and Technical Information (OSTI), September 2006. http://dx.doi.org/10.2172/895860.

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Green, David A., Brian S. Turk, Raghubir P. Gupta, Alejandro Lopez-Ortiz, Douglas P. Harrison, and Ya Liang. CARBON DIOXIDE CAPTURE FROM FLUE GAS USING DRY REGENERABLE SORBENTS. Office of Scientific and Technical Information (OSTI), May 2001. http://dx.doi.org/10.2172/789031.

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Green, David A., Brian S. Turk, Raghubir P. Gupta, Douglas P. Harrison, and Ya Liang. CARBON DIOXIDE CAPTURE FROM FLUE GAS USING DRY REGENERABLE SORBENTS. Office of Scientific and Technical Information (OSTI), October 2001. http://dx.doi.org/10.2172/789618.

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Green, David A., Brian S. Turk, Jeffrey W. Portzer, Raghubir P. Gupta, William J. McMichael, Ya Liang, and Douglas P. Harrison. CARBON DIOXIDE CAPTURE FROM FLUE GAS USING DRY REGENERABLE SORBENTS. Office of Scientific and Technical Information (OSTI), July 2002. http://dx.doi.org/10.2172/803845.

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