STUDY ON PNEUMATIC CONVEYANCE OF COLD ENERGY USING A PHASE-CHANGE MATERIAL ENCLOSED IN SMALL SPHERICAL CAPSULES

小球囊内相变材料气力输送冷能的研究

基本信息

批准号：
63850044
负责人：
KUROSAKI Yasuo
金额：
$ 3.9万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63850044/
关键词：
Cold Energy Utilization of Latent Heat Spherical Capsule Pneumatic Conveyance Freezing of Supercooled PCM 冷熱輸送小球カプセル潜熱蓄熱空気搬送ポンプ動力冷熱損失

项目摘要

In this research, a refined cold-energy conveying system which reduces the required pump power was proposed and feasibility of the proposed system was discussed. Generally speaking, the conventional cold-energy conveying system, in which the cold-energy is directly transported by chilled brine, requires large pumping power especially when the amount of transporting cold-energy becomes large. In order to overcome the defect of conventional system, the proposed refined system utilizes the latent heat of a phasechange material (PCM) enclosed in a small capsule and the capsules are conveyed with gas flow.Small scale test loop of the proposed system was constructed to measure the conveying performances and cold-energy conveying performance of the proposed system was compared with the one of conventional system. The results snowed that, under the condition of identical cold-energy conveying rate, the proposed system requires less pumping power than the conventional one especially when the conveying rate of cold-energy becomes large (e.g. > 1 MW). In order to minimize the required pumping power, effects of shapes and sizes of the capsules on the pressure drop were also examined. The results that the pumping power required for vertical transportation of the capsules by using large capsules outer diameter of which is almost similar to the inner diameter of duct, and that spherical capsules require less pump power than cylindrical ones.In addition to these investigation, the investigators proposed a fluidized-bed-type freezer which make the PCM enclosed in a capsule vibrate to enhance freezing of supercooled PCM, and effects of amplitude and frequency of the vibration on freezing was examined. The results showed that the fluidized-bed-type freezer in which the capsules are fluidized with chilled gaseous medium is suitable for reducing supercooling of PCM enclosed in a small capsule.

在这项研究中，提出了一种精制的冷能输送系统，该传送系统降低了所需的泵功率，并讨论了拟议系统的可行性。一般而言，传统的冷能输送系统，其中冷能是由冷盐水直接运输的，需要大的抽水功率，尤其是当运输冷能量变大的时候。为了克服常规系统的缺陷，拟议的精制系统利用了包含在小胶囊中的浮力材料（PCM）的潜热，并用气体流量输送胶囊。所拟议系统的小规模测试环由与拟议系统的传送性能相比，以衡量传送性能和冷雾性运输性能。结果下雪了，在相同的冷能输送速率的条件下，所提出的系统所需的泵送功率要比传统的泵功率少，尤其是当冷能的输送速率变大时（例如> 1兆瓦）。为了最大程度地减少所需的抽水功率，还检查了形状和胶囊大小对压降的影响。胶囊垂直运输所需的抽水功率通过使用大胶囊外直径几乎与管道内径相似，并且球形胶囊所需的泵舱比圆柱形的泵功率较少。在这些研究中，研究人员提出，该研究人员提出了一个易于旋转的液体，这使得PCM的自由液在液体上加入，以使其在液体中的自由液中的旋转量，以固定在液体状态下的液体量。 PCM，以及振动的振幅和频率对冰点的影响。结果表明，用冷冻气体介质将胶囊流动的流化床型冰柜适合减少封闭在小胶囊中的PCM的过冷。