Development of a Code for the Simulation of Absorption Refrigerating Machines

吸收式制冷机仿真代码的开发

• 批准号: 60850037
• 负责人: SAITO Takamoto
• 金额: $ 3.52万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60850037/
• 关键词: Absorption Refrigerating Machine; Static Characteristics; Optimal Operation; 省エネルギー; 臭化リチウム水溶液

For the purpose of improving the response to cooling load variations and the part load characteristics, the simulation code for a double-effect absorption refrigerating machine was developed, and the optimal operation method was investigated. The test machine was designed to be able to control energy input and weak solution flow rate continuously. It is composed of a gas-fired high-temperature generator, a separator, a low-temperature generator, an absorber, a condenser, an evaporator, and high- and low-temperature heat exchangers. The working fluid was Lithium Bromide and water solution. The standard output was 80 kW. Based on the experimental data, a simulation model of the static characteristics was developed. The experiments and simulation analysis indicate that there is an optimal weak solution flow rate which maximizes the coefficient of performance under any given cooling load condition. The optimal condition is closely related to the refrigerant steam flow rate flowing from the … More separator to the high-temperature heat exchanger with the intermediate solution.Because the heat capacity of absorption refrigerating machines is large compared with vapor compression refrigerating machines, the dynamic characteristics at the change in cooling load conditions are a problem to be improved. The control method of energy input and of weak solution flow rate following cooling load variations was investigated. As the changes in cooling load and cooling capacity are moderate, the optimal operation conditions corresponding to the cooling load can be estimated with steady state characteristics. If the relation between the cooling load and the optimal operation conditions is well known, a feed forward control can be employed. In this report a new control algorithm, which is called MOL (Multi-variable Open Loop) control, is proposed. Comparing the MOL control with the conventional chilled water outlet temperature proportional control, the MOL control enables the smooth changes in cooling capacity and the reduction in fuel consumption. Less

为提高双效吸收式制冷机对冷负荷变化的响应能力和部分负荷特性，开发了双效吸收式制冷机的仿真程序，并对双效吸收式制冷机的优化运行方法进行了研究。试验机设计为能够连续控制能量输入和稀溶液流速。它由燃气高温发生器、分离器、低温发生器、吸收器、冷凝器、蒸发器、高低温换热器组成。工作介质为溴化锂水溶液。标准输出功率为80 kW。在实验数据的基础上，建立了静态特性的仿真模型。实验和仿真分析表明，在给定的冷负荷条件下，存在一个最优的稀溶液流量，使性能系数最大。最佳条件与从蒸发器流出的制冷剂蒸汽流量密切相关。 ...更多信息 由于吸收式制冷机的热容量比蒸汽压缩式制冷机大，因此在冷负荷变化时的动态特性是一个有待改善的问题。研究了冷负荷变化时能量输入和稀溶液流量的控制方法。由于冷却负荷和冷却能力的变化是适度的，因此可以利用稳态特性来估计与冷却负荷相对应的最佳运行条件。如果冷却负荷和最佳操作条件之间的关系是众所周知的，则可以采用前馈控制。本文提出了一种新的控制算法，称为MOL（多变量开环）控制。与传统的冷冻水出口温度比例控制相比，MOL控制能够平滑地改变冷却能力并降低燃料消耗。少

项目成果

Eiji Hihara: "Modeling and Control of a Double-Effect Absorption Refrigerating Machine (1st Report: Modeling of the Static Characeristics)" Transactions of the Japanese Association of Refrigeration.

Eiji Hihara：“双效吸收式制冷机的建模和控制（第一份报告：静态特性建模）”日本制冷协会会刊。

飛原英治: 日本冷凍協会論文集.

Eiji Tobihara：日本制冷协会论文集。

Eiji Hihara: "Modeling and Control of a Double-Effect Absorption Refrigerating Machine (Part 1: Model Analysis)" 17th International Congress for Refrigeration.

Eiji Hihara：“双效吸收式制冷机的建模和控制（第 1 部分：模型分析）”第 17 届国际制冷大会。

Eiji HIHARA: 17th International Congress for Refrigeration, IIR. (1987)

Eiji HIHARA：第 17 届国际制冷大会，IIR。

Eiji Hihara: "Modeling and Control of a Double-Effect Absorption Refrigerating Machine (2nd Report: A Multi-variable Control Following the Cooling Load Variations)" Transactions of the Japanese Association of Refrigeration.

Eiji Hihara：“双效吸收式制冷机的建模和控制（第二次报告：冷负荷变化后的多变量控制）”日本制冷协会交易。