本项目的主要目标是研究对具有主动增强机制的吸收式制冷机的影响。根据文献综述，研究了各种机制，如振动、旋转和气泡，以改善吸收过程。在完成文献回顾并与PMS（项目监测小组委员会）沟通后，选择了所需的机制、实验条件和吸收式制冷机。在本最终报告中，介绍了1462项目的实验条件和相应结果- 介绍并讨论了RP“增强吸附流体传热传质的主动机制”。经过长时间的短期初步实验，我们选择了振幅为0.1mm至0.4mm的15 Hz至30 Hz的垂直正弦振动作为主要条件（因为我们在更高的频率或振幅下遇到共振和其他技术挑战）。本项目使用容量为12kW（40946 Btu/hr）的商用吸收式制冷机。我们安装并建造了外围系统，包括一个振动系统和一个水循环系统，以在室外条件变化时维持重复的实验条件。 我们还安装了溶液流量和温度实时采集系统。我们可以利用这些测量值来计算稳态下吸收器的传热传质能力。当比较振动前和振动期间的差异时，可获得增强效果。实验分为不同组进行，以确定添加剂、不同溶液流速以及不同振幅和频率的影响。 利用商用吸收式制冷机和所提出的机制，我们发现，在特定的频率和振幅组合下，吸收器的传热和传质可以得到极大改善（在最佳条件下提高近40%）。该效应是溶液流速（即降膜厚度）、振幅和振动频率的综合效应。该项目的结果显示了最佳的频率和振幅组合（在25 Hz和0。 2-0.3mm），用于本研究中测试的吸收式制冷机。该项目的结果为开始填补吸收式制冷机技术中机械运动影响的知识空白提供了信息。引文:ASHRAE研究

The main objective of this project is to investigate the impacts on an absorption chiller with active enhancement mechanisms. From the literature review, various mechanisms, such as vibration, rotation and air-bubble, were investigated to improve the absorption process. After completing the literature review and communication with PMS (project monitoring sub-committee), the desired mechanism, experimental conditions and the absorption chiller were selected.In this final report, the experimental conditions and the corresponding results of the project 1462-RP "Active Mechanisms for Enhancing Heat and Mass Transfer in Sorption Fluids" were presented and discussed. After a long time short-term preliminary experiments, we selected vertical sine vibration from 15 Hz to 30 Hz with amplitude from 0.1mm to 0.4mm as the primary conditions (as we encounter resonance and other technical challenges at higher frequencies or amplitudes).A commercial absorption chiller with a capacity of 12kW (40,946 Btu/hr) is utilized in this project. We installed and constructed peripheral systems, including a vibration system and a water loop system, additional to the chiller in order to maintain a repetitive experimental condition when the outdoor conditions change. We also installed a data acquisition system for in-line (real-time) measurement on the solution concentration and temperature and flow rate of the solution and water loops. We can use these measurements to calculate the heat and mass transfer capacity in the absorber in steady-state. The enhancement is obtained when the differences, before a vibration and during a vibration, are compared. The experiments were conducted in different groups to identify effects from additives, different solution flow rates as well as different amplitudes and frequencies.With the commercial absorption chiller and the proposed mechanism, we found that, under specific combination of frequencies and amplitudes, the heat and mass transfer of the absorber can be greatly improved (with nearly 40% enhancement at the optimal conditions). The effect is a combined effect of the solution flow rate (i.e. falling film thickness), the vibration amplitude, and the vibration frequency. The results of this project revealed the optimal frequency and amplitude combinations (at 25 Hz & 0.2-0.3mm) for the absorption chiller tested in this study. The results of this project provided information to start filling the knowledge gap about the influence of mechanical motion in absorption chiller technology.