混合工质变浓度空调系统动态特性的模拟

本文在分析混合工质变浓度空调系统的传热传质和参数间的相互耦合关系的基础上,以实际流体的质量、动量和能量守恒方程为基础,结合系统各部件的特点,分别建立了各部件的数学模型,并实现了对系统动态特性的模拟计算和分析。     

Analysis of Long-Term Optical Effects in Double-Coated Optical Fibers Induced by Hydrostatic Pressure and Thermal Loading

The hydrostatic pressure and thermal loading simultaneously induced optical effects in double-coated optical fibers in the long-term are analyzed by the viscoelastic theory. Using the Laplace transformation method, close-form solutions for the microbending loss and refractive index changes are obtained. The results of the microbending loss are initially identical to those obtained by the elastic analysis, and then decrease gradually as time progresses. The microbending loss and refractive index changes of the glass fiber are functions of the material properties of the primary and secondary coatings. To minimize the microbending loss and refractive index changes in the long-term, the Young's modulus of the primary coating, and the viscosity and Poisson's ratio of the secondary coating should be increased. Nevertheless, the viscosity and Poisson's ratio of the primary coating, and the Young's modulus of the secondary coating should be decreased.     

混合工质匹配性能的热力学分析

利用经典热力学的基本理论,建立了传热过程不可逆损失与匹配性能之间的关系式,从理论上揭示了制冷工质与变温热源的温度匹配性能与其不可逆损失之间的内在联系和混合工质的节能机理,使热力学理论在研究不可逆传热过程中得到了充分的应用与发展。     

Modelling of coupled heat and moisture transfer in porous construction materials

In this paper, a mathematical model is proposed for predicting air temperature and humidity in a two-room region. The model contains a coupled relationship between temperature and humidity within the constructions and can be solved by using the numerical method. However, the two-room region can be reduced to a single region when the region with no ventilation is considered, and then the room temperature and relative humidity can be obtained analytically. The solution obtained in this paper is verified by comparing with the result of the analytical method. It shows that the two results are in agreement. In addition, the proposed model can also be applied to simultaneously obtain the transient temperature and humidity of a two-room region for different porous construction materials.