Characteristics of Plate-Fin Heat Exchanger with Phase Change Material

相变材料板翅式换热器的特点

• 批准号: 61550169
• 负责人: OKADA Masashi
• 金额: $ 1.28万
• 依托单位: Aoyama Gakuin University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550169/
• 关键词: Heat exchanger; Plate-fin; Latent heat; Thermal energy storage; Cross flow; Effectiveness; overall heat-transfer coefficient; 周期運転

Latent heat-of-fusion energy systems are useful, because they are able to supply continuously the thermal energy to the lower-temperature fluid even when the supply of heat from the higher-temperature fluid varies with time. In the present report a plate-fin heat exchanger with a phase change material (PCM) was studied. The present heat exchanger, which was made with 310 copper square-tubes with 9.5 mm sides, 0.5 mm thickness, and 300 mm length, was a single-pass cross-flow type, both fluids (air) unmixed. The n-octadecane, of which the fusion temperature is 28.0 C, was used as the PCM. The 2.13 kg PCM was filled in the 154 tubes. three kinds of experiments were carried out and the inlet and outlet temperatures and the temperatures in the PCM were measured. In the first experiments, the effectiveness and the overall heat-transfer coefficient were obtained at steady states. The plate-fin improved the effectiveness by about 10 %. By the calculations of steady three-dimensional heat conduction, the effects of the parameters, --- dimensions, thermal properties, and heat transfer coefficients of air ---, on the overall heat-transfer coefficients were obtained clearly. In the second experiments, since the higher-temperature air-flow was stoped, the outlet temperatures of the lower-temperature air were maintained at the constant temperatures for 90-150 minutes. In the third experiments, the higher-temperature air was flowed intermittently with an equal interval. The flow rates were equally 400 1/min, and the inlet temperatures of air were 70 C and 10 C, and the period was 2 hours. The outlet temperature of the lower-temperature air was between 20 C <plus-minus> 2.5 C. The above transient and periodical experiments showed that the present heat exchanger with PCM had useful characters of latent heat storagf

熔化潜热能量系统是有用的，因为即使当来自较高温度流体的热量供应随时间变化时，它们也能够连续地向较低温度流体供应热能。本文对相变材料板翅式换热器进行了研究。本热交换器由310根边长为9.5 mm、厚度为0.5 mm、长度为300 mm的铜方管制成，为单通道错流式，两种流体（空气）不混合。使用熔点为28.0 ℃的正十八烷作为PCM。将2.13 kg PCM填充到154个管中。进行了三种实验，并测量了入口和出口温度以及PCM中的温度。在第一个实验中，在稳定状态下获得的有效性和总传热系数。板翅式换热器的效率提高了约10%。通过三维稳态导热计算，明确了空气的几何尺寸、热物性参数和传热系数对总传热系数的影响。在第二个实验中，由于高温气流停止，低温空气的出口温度保持在恒定温度下90-150分钟。在第三个实验中，较高温度的空气以相等的间隔间歇地流动。流速均为400 l/min，空气入口温度为70 ℃和10 ℃，时间为2小时。低温空气的出口温度在20 ℃ ~ <plus-minus>2.5 ℃之间。上述瞬态和周期性实验表明，该相变蓄热换热器具有良好的相变蓄热特性，