The Experts below are selected from a list of 23763 Experts worldwide ranked by ideXlab platform
Wenxing Shi - One of the best experts on this subject based on the ideXlab platform.
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A simplified model of heat and Moisture Transfer for tailrace tunnel ventilating in hydropower station
Applied Thermal Engineering, 2009Co-Authors: Wenxing ShiAbstract:Tailrace tunnel ventilating can be used as a highly efficient and energy saving air conditioning for factory buildings in hydropower stations. This paper describes a simplified model of heat and Moisture Transfer for tailrace tunnel ventilating system with the assumption of isothermal boundary for tunnel wall, and constructs a small-scale experimental set-up to simulate the heat and Moisture Transfer process during the air flowing through the tunnel. The model has been validated against the experimental and field-test data, and it shows a good agreement. This simplified model is intended for use in annual performances prediction of heat and Moisture Transfer or provides the design tools for tailrace tunnel ventilating system in hydropower stations.
Ibrahim Dincer - One of the best experts on this subject based on the ideXlab platform.
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Application of Moisture Transfer models to solids drying
Proceedings of the Institution of Mechanical Engineers Part A: Journal of Power and Energy, 2005Co-Authors: E. Kavak Akpinar, Ibrahim DincerAbstract:In this paper, a comprehensive experimental investigation is conducted to measure the Moisture content distributions within slab cut potato pieces during drying at temperatures of 60, 70, and 80 C and flow velocities of 1.0 and 1.5 m/s. Four drying models are employed to determine the drying process parameters (drying coefficient, lag factor, and half-drying time) and Moisture Transfer parameters (Moisture diffusivity and Moisture Transfer coefficient), and to calculate Moisture content distributions and compare them with extensive sets of experimental Moisture data measured during the drying of slab cut potato slices at different drying air temperatures and flow velocities. Good agreement is obtained between the calculations and experimental measurements for the cases. In addition, experimental drying times are determined and compared with those obtained by the four different drying models. The results show that all four models are well able to determine the drying parameters and Moisture content distributions. The experimental data and model findings are expected to be useful to the drying industry.
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Moisture Transfer models for slabs drying
International Communications in Heat and Mass Transfer, 2005Co-Authors: E. Kavak Akpinar, Ibrahim DincerAbstract:This paper deals with an experimental and theoretical investigation of drying of moist slabs. Experimental part includes the measurement of the Moisture content distributions of eggplant slices with 5 mm thickness and 35 mm diameter during drying at the temperatures of 55 °C, 65 °C, and 75 °C and the velocities of 1.0 and 1.5 m/s, respectively. Four drying models are used to determine drying process parameters (e.g., drying coefficient, lag factor, and half-drying time) and Moisture Transfer parameters (e.g., Moisture diffusivity and Moisture Transfer coefficient), and to calculate Moisture content distributions. The calculated values are then compared with the experimental Moisture data during the drying of eggplant slices at different drying air temperatures and flow velocities. An excellent agreement is obtained between the calculations and experimental measurements for the cases considered. Also, the experimental drying times are determined and compared with the ones obtained through four different drying models. The results show that all four models are capable of estimating the drying parameters and Moisture content distributions. The experimental drying data and model findings are expected to be useful to drying industry.
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Analysis of two‐dimensional heat and Moisture Transfer during drying of spherical objects
International Journal of Energy Research, 2003Co-Authors: M.m. Hussain, Ibrahim DincerAbstract:This paper deals with the numerical and analytical modelling of two-dimensional heat and Moisture Transfer during drying of a spherical object. Drying is considered to be a process of simultaneous heat and Moisture Transfer whereby Moisture is vapourized by means of a drying fluid (e.g. air), as it passes over a moist object. Numerical modelling of two-dimensional heat and Moisture Transfer during drying of a spherical object is carried out using an explicit finite-difference approach. Temperature and Moisture distributions inside the object are determined by using the developed computer code. Moreover, the results predicted from the present model are compared with the experimental data available in the literature and a considerably high agreement is found. Copyright © 2003 John Wiley & Sons, Ltd.
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Graphical determination of drying process and Moisture Transfer parameters for solids drying
International Journal of Heat and Mass Transfer, 2002Co-Authors: Ahmet Z. Sahin, Ibrahim DincerAbstract:In this paper a simple graphical method is proposed to determine the drying Moisture Transfer parameters such as Moisture diffusivity and Moisture Transfer coefficient for solid products. Once the lag factor and the drying coefficient are obtained from the experimental Moisture content data, the proposed graphical method can be used to estimate the drying Moisture Transfer parameters in a quick and efficient manner. Drying time can also be easily determined for a solid whose drying process parameters are known. Two illustrative examples are given to highlight the importance of the topic and validate the use of the present methodology for practical drying applications.
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Moisture Transfer analysis during drying of slab woods
Heat and Mass Transfer, 1998Co-Authors: Ibrahim DincerAbstract:This article presents an analytical technique for determining the Moisture diffusivities and Moisture Transfer coefficients for slab shaped woods subjects to drying process. The analysis of transient Moisture diffusion is carried out on the basis of two important practical criteria: 0.1 100. The drying coefficients and lag factors are defined for wood-drying applications and incorporated into the models. In order to verify the present models, the model results are compared with experimental measurements taken from the literature and good agreement was found. Results show that the technique presented here is capable of determining the Moisture diffusivities and Moisture Transfer coefficients for slab woods in a simple and accurate manner for practical applications and will be beneficial to the relevant wood␣drying industries. This approach can be extended to␣different wood products of regular and irregular shapes.
Yanhong Chen - One of the best experts on this subject based on the ideXlab platform.
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Effect of thermal intensity and initial Moisture content on heat and Moisture Transfer in unsaturated soil
Sustainable Cities and Society, 2020Co-Authors: Gao Yan, Shuyue Dong, Chuang Wang, Yanhong ChenAbstract:Abstract Soil is an economical and convenient energy storage medium that can be used for air conditioning and space heating. Thermal intensity and soil initial Moisture content are the key factors influencing Moisture Transfer in soil. In this paper, we investigated the coupled heat and Moisture Transfer in unsaturated soil under thermal effects, and developed mathematical models in one-dimension for the coupled heat and Moisture Transfer processes. A series of experiments with different thermal intensities and initial Moisture content were carried out to observe temperatures and Moisture contents in sandy soil. The model was validated on the basis of experimental data. The soil column experiment results showed that Moisture Transfer flux was positively correlated with heat source temperature. In addition, under different initial Moisture content conditions, the effects on Moisture Transfer were different even under the same driving force of temperature gradient. Under the same heat source temperature, soil with low Moisture content had a strong Moisture Transfer, thus removing more heat, but the actual process showed that soil with high Moisture content had a strong heat Transfer, indicating that heat Transfer, which indicates that heat conduction played a more important role than Moisture Transfer.
Jung-pyo Lee - One of the best experts on this subject based on the ideXlab platform.
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MODELING AND VERIFICATION OF HEAT AND Moisture Transfer IN AN ENTHALPY EXCHANGER MADE OF PAPER MEMBRANE
International Journal of Air-conditioning and Refrigeration, 2012Co-Authors: Eul-jong Lee, Jung-pyo Lee, Hyun-min Sim, Nae-hyun KimAbstract:In this study, heat and Moisture Transfer model of an enthalpy exchanger is proposed. With separately measured sorption constant and diffusion coefficient, the model predicts the heat and Moisture Transfer effectiveness of an enthalpy exchanger. Two sample enthalpy exchangers were tested at a KS condition to verify the model. The model predicts the heat Transfer effectiveness within 4%, and the Moisture Transfer effectiveness within 10%. Pressure drop is predicted within 6%. The spacer fin efficiency for heat Transfer was 0.11 to 0.13. The fin efficiency for Moisture Transfer, however, was negligibly small. For heat Transfer, the conduction resistance to total thermal resistance was less than 1%. For Moisture Transfer, however, membrane resistance was dominant to convective Moisture Transfer resistance.
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HEAT AND Moisture Transfer CHARACTERISTICS OF A PLATE-TYPE ENTHALPY EXCHANGER MADE OF PAPER
International Journal of Air-conditioning and Refrigeration, 2011Co-Authors: Eul-jong Lee, Nae-hyun Kim, Gil-sub Song, Jung-pyo LeeAbstract:In this study, heat and Moisture Transfer data of an enthalpy exchanger were obtained varying the indoor and outdoor condition systematically. At the same time, equilibrium water content ratios of the membrane were measured. It is shown that equilibrium water content ratio of the membrane increases with the increase of relative humidity. The effect of temperature on equilibrium water content ratio, however, is rather complex. It decreases with the increase of temperature to a certain value, and then increases with further increase of temperature. Moisture Transfer effectiveness of the enthalpy exchanger is also affected by relative humidity and temperature. Heat Transfer effectiveness, however, is independent of relative humidity and temperature. Moisture Transfer effectiveness of the enthalpy exchanger was successfully correlated by equilibrium water content ratio of the membrane.
Huang Yue-wu - One of the best experts on this subject based on the ideXlab platform.
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Heat and Moisture Transfer Characteristics of Multilayer Walls
Energy Procedia, 2018Co-Authors: Liu Rong, Huang Yue-wuAbstract:Abstract A transient model coupled heat, air and Moisture is developed and validated to investigate the heat and Moisture Transfer characteristics of the exterior walls. Relative humidity and temperature are chosen as the driving potentials. The temperature, relative humidity and heat flux of the internal surfaces of the Expanded Polystyrene( EPS) external insulation wall and concrete wall are analyzed. The results show that, when considering Moisture Transfer, the temperature fluctuations of internal surface is reduced. The thermal insulation wall has the lower internal surface temperature and is beneficial to improve the indoor thermal environment. The relative humidity of the inner surface of the insulation wall is higher. Moisture migration in the wall can cause Moisture accumulation and the added latent heat caused by Moisture Transfer can’t be ignored. Heat flow through the inner surface of the insulation wall is smaller, therefore the insulation wall is helpful to reduce air conditioning load.
