Microencapsulated phase change material (MPCM), which has a large amount of heat capacity during phase change, has been used as a thermal storage medium as a building composite material. MPCM is broken by heat-induced volume changes, and hence, thermal cyclic tests must be performed to estimate their durability. Existing methods for thermal cyclic testing have limitations such as few samples that can be tested or long duration of test. This paper proposes a thermal cyclic test device with a Venturi injector designed to test a large number of samples rapidly. Results of the detailed tests on the pressure and flow rate change of the Venturi tube and the reliability assessment of the developed equipment are presented. MPCM slurry can be transported with up to 25% mass concentration of MPCM at a flow rate of 5 LPM. At 25wt%, MPCM slurry could change 100% of its phase within a straight line of a heat exchange pipe length of 0.61 m from 28 to 35 °C. One thermal cycle for 1 kg of MPCM capsules has a duration of 47 s. Finally, a 5000–thermal cycle test of MPCM was carried out, and it showed that using this equipment caused no broken capsules.

微胶囊化相变材料（MPCM），其相变时具有较大的热容量，已被用作建筑复合材料的蓄热介质。MPCM 因热引起的体积变化而损坏，因此必须进行热循环测试以估计其耐久性。现有的热循环测试方法具有局限性，例如可以测试的样本很少或测试持续时间长。本文提出了一种带有文丘里注射器的热循环测试装置，旨在快速测试大量样品。文丘里管的压力和流量变化的详细测试结果以及开发设备的可靠性评估都被呈现出来。MPCM 泥浆可以在 5 LPM 的流速下以质量浓度高达 25% 的 MPCM 进行运输。在 25wt% 时，MPCM 浆料可以在 0.61 m 的热交换管长度的直线内从 28 到 35 °C 改变其相的 100%。1 公斤 MPCM 胶囊的一个热循环持续时间为 47 秒。最后，对 MPCM 进行了 5000 次热循环试验，结果表明使用该设备没有造成胶囊破裂。