Particle size distribution in ice slurry systems-analysis of dual-view particle images.

Ice slurry is used as secondary refrigerant and for energy storage. It is a mixture of water, a freezing point depressant and small ice particles. The usage of ice slurry can reduce the exergy losses of a cooling system and the refrigeration charge in the primary system. It’s possible to uncouple the cooling demand from the cold production of refrigeration systems. Due to the latent heat of fusion of the small ice particles in the liquid phase, ice slurry has a high energy density compared to single phase secondary refrigerants.
Important parameters that may influence the thermophysical and rheological parameters of ice slurry are the ice particle size and the size distribution as well as the shape and surface characteristics of the ice particles.
The test rig and setup to measure the ice particle size and shape, which have be presented at the IJR2015-conference, will be summarized and sample measurements with ethanol based ice slurry will be shown as well. The methods and procedures to measure the particle size distribution from the ‘raw’ image to the distribution are described in detail. Also the values needed to evaluate the particles are shown. Sample measurements using an ethanol based ice-slurry are presented and the results of these measurements are discussed.

冰浆（ice slurry）常被用作二次制冷剂（secondary refrigerant）并应用于储能领域。其为水、防冻剂（freezing point depressant）与细小冰粒的混合物。采用冰浆可降低冷却系统的㶲损失（exergy losses）以及一次系统的制冷剂充注量，还能够实现冷却需求与制冷系统冷量生产的解耦。由于液相中细小冰粒的熔化潜热（latent heat of fusion），相较于单相二次制冷剂，冰浆具备更高的能量密度。

可能影响冰浆热物理（thermophysical）与流变（rheological）参数的重要参数包括冰粒粒径、粒径分布，以及冰粒的形状与表面特性。

此前在IJR2015会议上展示过的用于测量冰粒粒径与形状的试验台（test rig）与实验装置，本文将对其进行总结，并同时展示乙醇基冰浆（ethanol based ice slurry）的样本测量结果。文中将详细阐述从‘原始’图像获取粒径分布的方法与流程，同时给出颗粒评估所需的各项参数。此外还将呈现乙醇基冰浆的样本测量实例，并对此次测量的结果展开讨论。