溴化锂吸收式制冷机的应用分析

概述了溴化锂吸收式制冷的原理，分析了溴化锂吸收式制冷机的综合效益及其一次能源利用率，以热电厂热电冷三联供系统为例分析了溴化锂吸收式制冷机的节能效益，并指出了溴化锂吸收式制冷机在工程应用中应注意的问题。     

溴化锂水溶液的结晶控制及应用对策

从应用实例出发,对溴化锂吸收式制冷机组运行时可能发生的溶液结晶现象,以及溴化锂水溶液的结晶机理进行分析,并提出溴化锂水溶液的结晶的应用对策,部分机组运行验证的结果表明这种策略可行.     

塑料管单效溴化锂吸收式制冷机理论研究

分析了塑料管单效溴化锂吸收式制冷机的理论循环，对塑料管单效溴化锂吸收式制冷机进行了热力计算和传热计算，为塑料管单效溴化锂吸收式制冷机的结构设计及实验研究提供理论依据。     

酸性溴化锂熔盐水合物溶解木质素的实验研究

以溴化锂对木质素的溶解为研究基础,研究溴化锂浓度及反应温度对纯化后酸性玉米芯木质素溶解性能的影响,使用傅里叶红外光谱仪(FTIR)表征溶解前后木质素的官能团,得出最适合溶解木质素的条件:溴化锂浓度为60％,反应温度为120℃最适合木质素溶解;酸性溴化锂熔盐水合物能选择性裂解木质素β—O—4芳基醚键,木质素的α—OH在溴...     

利用汽车发动机余热的溴化锂吸收式制冷研究

根据现有汽车空调的制冷系统和发动机冷却水及排气系统的结构特点,结合溴化锂吸收式制冷系统的工作原理,提出将汽车排气管和发动机冷却水箱进行结构改造作为溴化锂吸收式制冷系统的发生器,代替传统的汽车空调的制冷和采暖系统及发动机冷却系统。并对该溴化锂制冷系统进行了热力计算和传热面积的计算,计算结果表明,溴化锂制冷系统充分利用了废气余热和冷却水余热,减少了汽车油耗,并且改造后的排气热交换器和冷却水箱传热面积小,结构简单紧凑。     

溴化锂吸收式制冷机与蒸汽压缩式制冷机的能耗比较

本文对溴化锂吸收式制冷机与蒸汽压缩式制冷机的能耗进行了比较研究,认为溴化锂吸收式制冷机节电不节能,而溴化锂吸收式制冷机与离心式制冷机联合运行,既可缓解供电紧张,又可提高能量利用效率,应予以充分重视。     

浅析溴化锂制冷系统的节能

分析了影响溴化锂制冷系统能耗的诸多因素 ,提出了降低溴化锂制冷系统能耗而进行的节能改造及取得的节能效果     

溴化锂制冷机组节能综合效果评价

通过溴化锂和往复式制冷机组的能耗比较,在机组制冷容量与空调最大冷负荷相匹配的条件下,两种机组能耗无明显差异,但溴化锂机组节电显著。只要合理利用废汽和余汽,溴化锂机组是目前制冷设备选型中考虑节能因素的首选机型。     

吸收式制冷技术的应用与发展

溴化锂吸收式制冷技术在我国得到了飞速发展和广泛应用。介绍了溴化锂吸收式制冷技术在我国应用情况,对单效机,双效机及直燃机的应用场合进行了分析,同时对溴化锂吸收式制冷技术将来的发展进行了展望。     

溴化锂吸收制冷的工艺过程

<正> 溴化锂吸收制冷于1945年试制成功,但由于金属的腐蚀等问题没有得到很好解决,所以一直未能发展起来。从六十年代起,我国的钢铁、纺织部门开始使用溴化锂吸收制冷技术。近年来,石化系统也对其发生了极大的兴趣。溴化锂吸收制冷是以消耗热能为补偿,利用溴化锂—水溶液的热力特性来完成工作循环     

用元素扩散方程和化学平衡热力计算的方法求解多组分反应流场

提出了一种新的方法来计算多组分化学反应流场。它首先引入了元素的分布方程，然后根据化学平衡的热力计算方法求解每一位置的组分及温度。这样，在计算低速流场时，就避免了处理化学反应源项引起的数值计算过程中的方程刚性问题，也减少了组分方程的数量。计算结果表明，这种方法的计算结果比EBU模型的计算结果更好的反应了物质热解离的情况。     

Equations of motion for a rotor blade,including gravity,pitch action and rotor speed variations

This paper extends Hodges–Dowell's partial differential equations of blade motion, by including the effects from gravity, pitch action and varying rotor speed. New equations describing the pitch action and rotor speeds are also derived. The physical interpretation of the individual terms in the equations is discussed. The partial differential equations of motion are approximated by ordinary differential equations of motion using an assumed mode method. The ordinary differential equations are used to simulate a sudden pitch change of a rotating blade. This work is a part of a project on pitch blade interaction, and the model will be extended to include an aerodynamic model and be used for analysis of basic properties of pitch blade interaction. Copyright © 2007 John Wiley & Sons, Ltd.     

链条炉排加煤粉复合燃烧锅炉炉膛传热计算基本方程

推导了链条炉排加煤粉复合燃烧锅炉炉膛的物擀平衡方程和上下炉膛的烟气热平衡方程，方程中考虑了上下炉膛间的辐射换热。用直接计算辐射换热量的方法，推导了炉膛的辐射换热方程，这些方程联立求解，可进行该类型锅炉炉膛的传热计算。     

THE k-ε MODEL AND COMPUTED SPREADING RATES IN ROUND AND PLANE JETS

Several prior computational works that employ the steady, incompressible boundary layer (BL) equation have reported their inadequacy in predicting measured values of spreading rates in jets. This work employs a model that solves the complete set of transient conservation equations for multidimensional reacting flows and the k- k model without making the assumptions that lead to the steady, incompressible BL form of the equations. This work discusses the dependence of the computed spreading rates on the numerical resolution and on the additional terms that appear in the multidimensional equations, including the k- k model, relative to the BL equations.     

Stability of Partial Functional Integro-Differential Equations

Using the Fourier method of separation of variables and a procedure proposed in this paper, namely, reducing integrodifferential equations to systems of ordinary differential equations, the exponential stability of partial functional integro-differential equations is studied. Various tests for the exponential stability are proposed. In contrast to many other known methods our approach does not assume the smallness of integral terms. This allows us to use the method for stabilization of processes described by unstable differential equations by adding controls in the form of integral terms. Finally, using our approach, a phase transition model is analyzed. 2000 Mathematics Subject Classification. 34K15, 35B05. This research was supported by the program KAMEA of the Ministry of Absorption of the State of Israel.     

Analysis of residual stresses in a long hollow cylinder

This paper presents an analytical method for solving the axisymmetric stress problem for a long hollow cylinder subjected to locally-distributed residual (incompatible) strains. This method is based on direct integration of the equilibrium and compatibility equations, which thereby have been reduced to the set of two governing equations for two key functions with corresponding boundary and integral conditions. The governing equations were solved by making use of the Fourier integral transformation. Application of the method is illustrated with an analysis of the welding residual stresses in a butt-welded thick-walled pipe.     

Thermal Stresses in Anisotropic and Radially Inhomogeneous Annular Domains

This paper presents an analytical approach for construction of solutions to the plane quasi-static, non-axially-symmetric elasticity and thermoelasticity problems for cylindrically anisotropic and radially inhomogeneous hollow cylinders and disks subjected to in-plane external force loadings and temperature distribution. This approach is based upon the direct integration of equilibrium equations, which are independent of material properties. The original problems are reduced to integral equations of Volterra type. By application of the resolvent technique, solutions of the governing integral equations are constructed in explicit form, which is convenient for analysis and appropriate for various kinds of inhomogeneity.     

Simplified solution of developing laminar forced flow between parallel plates

A simplified simulation for developing laminar forced flow in the entrance region between two parallel plates is presented. This simulation is based on an implicit finite difference numerical representation of a boundary layer model describing the flow in the entry region. This boundary layer model comprises the two conservation equations of mass and momentum. A non‐iterative implicit numerical scheme is developed to convert the partial differential form of these governing equations into algebraic equations. The resultant algebraic equations have been solved simultaneously via a simplified simulation using spreadsheet programs as well as a Fortran code for the sake of comparison. The numerically obtained developing axial velocity profile at large distance downstream of the entrance shows excellent agreement with the available fully developed analytical profile. Comparison between the abilities of the spreadsheet simulation with other high‐level programming languages is outlined. Copyright © 2002 John Wiley & Sons, Ltd.     

正交各向异性媒质中电磁场的有限元法

针对非均匀正交各向异性媒质中的电磁场问题,给出了相应的约束方程和定解条件;对边值问题及其变分问题的等价进行了证明,在此基础上建立了相应的有限元方法,并对非均匀正交各向异性媒质中的有限元方程进行了编程计算。     

Three-Dimensional Temperature and Thermal Stress Analysis of an Inhomogeneous Layer

In this article we present a technique for analytical solution of three-dimensional heat-conduction and thermal-stress problems for an elastic layer whose thermophysical and mechanical properties are arbitrary functions of the transversal coordinate. This technique is based on direct integration of the original heat-transport and thermoelasticity equations and allows for reducing the original problems to solution of the governing Volterra integral equations of second kind. The obtained governing equations are solved by making use of the resolvent kernel.