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Improved Property Data Correlations of Absorption Fluids for Computer Simulation of Heat Pump Cycles 热泵循环计算机模拟中吸收液性能数据关联的改进
根据在实验室设备和工作热泵系统中进行的测量,多年来已经产生了大量关于吸收流体热力学和传输特性的数据。近年来,一直在努力将可用数据的范围扩大到更高的温度和压力,以促进高级多级循环的实施。这些数据以各种形式出现在文献中,包括表格、基于热力学模型的状态方程和不同范围的经验方程。对吸收系统的计算机模拟的日益增长的需求促使了性能数据的关联。本研究的目的是汇编关于常见吸收液的最新可用信息,并以适合计算机计算的形式呈现。 考虑到一个复杂循环的建模可能涉及模拟程序的大量迭代,对所需特性的简单评估至关重要。在关联数据时,已努力将任何迭代计算减少到最低限度。已经为吸收系统中最常用的流体——水、溴化锂(LiBr)——水和水氨——建立了性能数据关联式。关联式基于物理状态方程,依赖于热力学模型。给出了汽液平衡(PTX)、液体和蒸汽焓、液体密度和蒸汽熵的关联式。这些关联式已在用于模拟吸收系统的计算机程序中实现,并且被发现既准确又便于计算。关键词:1996年,计算,性能,水,溴化锂,吸收剂,混合物,计算机,热泵,循环,热力学,热含量,沸点,温度,吸收式热泵,传热流体引用: 研讨会论文,乔治亚州亚特兰大,1996年
Substantial amounts of data have been generated over the years on the thermodynamic and transport properties of absorption fluids, based on measurements conducted both in laboratory equipment and in working heat pump systems. In recent years, efforts have been under way to extend the range of available data to higher temperatures and pressures to facilitate implementation of advanced, multistage cycles. The data have been presented in the literature in various forms, including tables, equations of state based on thermodynamic models and empirical equations for different ranges. The growing need for computer simulations of absorption systems has prompted the correlation of property data. The objective of the present study has been to compile the most recent available information on common absorption fluids and present it in a form suitable for computer calculations. Considering the fact that modelling a complex cycle may involve a large number of iterations by the simulation program, easy evaluation of the required properties is of utmost importance. In correlating the data, an effort has been made to reduce to a minimum any iterative calculations. Property data correlations have been developed for the fluids most commonly used in absorption systems - water, lithium bromide (LiBr)-water, and water-ammonia. The correlations are based on physical equations of state, relying on thermodynamic models. Correlations are given for vapour-liquid equilibrium (PTX), liquid and vapour enthalpy, liquid density, and vapour entropy. The correlations have been implemented in a computer code for simulation of absorption systems and were found to be both accurate and convenient for calculations.KEYWORDS: year 1996, calculating, properties, water, lithium bromide, absorbents, mixtures, computers, heat pumps, cyclic, thermodynamics, heat content, boiling point, temperature, absorption heat pumps, heat transfer fluids
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