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Polygeneration Study of Low-to-Medium Enthalpy Geothermal Reservoirs in Mexico

Journal of thermal Science 2021年第3期30卷 1077-1087页

作者： CHÁVEZ Oscar GODÍNEZ Francisco Tecnológico Nacional de México/I.T.Chihuahua.Av.Tecnológico 2909 C.P.31310ChihuahuaChihuahuaMéxico Instituto de Ingeniería Universidad Nacional Autónoma de MéxicoUNAMC.U.Ciudad de MéxicoC.P.04510México Polo Universitario de Tecnología Avanzada Universidad Nacional Autónoma de MéxicoVía de la Innovación No.410Autopista Monterrey-Aeropuertokm.10 PIITC.P.66629Apodaca Nuevo LeónMéxico

This study combines the thermodynamic analysis of a polygeneration system along with the numerical modelling of the thermal behavior of geothermal reservoirs in Mexico to exploit their *** reservoir was modeled as a porous medium assuming a five-spot well configuration and local thermal *** heat conduction-convection along with the Laplace equations were solved to compute temperature distributions,the useful life and the optimum distance between injection-extraction *** predicted temperature and pressure of the geothermal fluid at the outlet of the reservoir were exploited in the polygeneration system consisting of:(1)a Rankine cycle,(2)an absorption refrigeration cycle,and(3)a heat *** developed approach allows calculating both the optimal distance between injection-extraction wells and the global(utilization)efficiency of six arrangements(each composed by a reservoir connected to a polygeneration system)by assuming that reservoirs have a lifespan of 30 *** also show that:(a)due to the low efficiency of the Rankine cycle,very little thermal energy is converted into electrical one;(b)not only the temperature and the size are important when evaluating the power production performance of reservoirs,but also the permeability plays a fundamental role;(c)the first law efficiency of the polygeneration system ranges from 41.9%to 43.7%;(d)the utilization efficiency of the six arrangements lies in the range between 25.8%and 31%.

关键词： polygeneration system geothermal reservoir local thermal equilibrium low-to-medium enthalpy

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Forced　Convective　Heat　Transfer　in　a　Plate　Channel　Filled　with　Solid　Particles

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Journal of thermal Science 1996年第1期5卷 43-53页

作者： Pei-Xue Jiang Ze-Pei Ren Bu-Xuan Wang Zhan WangDepartment of thermal Engineering,Tsinghua University,Beijing 100084 China) Department of thermal Engineering Tsinghua University Beijing China

A numerical study of fluid flow and convective heat transfer in a plate channel filled with solid (metallic)particles is presented in this *** study uses the thermal equilibrium model and a newly developed numerical model which does not assume idealized local thermal equilibrium between the solid particles and the *** numerical simulation results are compared with the experimental data in reference[2].The paper investigates the effects of the assumption of local thermal equilibrium versus non-thermal equilibrium,the thermal conductivity of the solid particles and the particle diameter on convective heat *** the conditions studied,the convective heat transfer and the temperature field assuming local thermal equilibrium are much different from that for the non-thermal equilibrium assumption when the difference between the solid and fluid thermal conductivities is large. The relative values of the thermal conductivities of the solid particles and the fluid also have a profound effect on the temperature distribution in the *** pressure drop decreases as the particle diameter increases and the convective heat transfer coefficient may decrease or increase as the particle diameter increases depending on the values of ε,λs,λf,λd,αv, ρu.

关键词： porous media local thermal equilibrium non-thermal equilibrium particle diameter convective heat transfer.

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Characteristics of Analyte Ionization in Low Power Microwave Plasma Torch

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Chemical Research in Chinese Universities 1993年第3期9卷 208-213页

作者： ZHANG Han-qi, LIU Xiao-jing, YU Ai-min and JIN Qin-han (Department of Chemistry, Jilin University, Changchun, 130023)

The ionization characteristics of the analytes in a low power Ar microwave plasma torch (MPT) was studied. The influence of forward microwave power, the flow rate of carrier gas and matrix element on the degree of ionization were observed. The axial profiles of the degree of the ionization of some elements were determined. The experimental results are very important for developing the new analytical source——microwave plasma torch (MPT).

关键词： Microwave plasma torch (MPT) Degree of ionization local thermal equilibrium Excitation temperature

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