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Experimental study on the thermal performance of air-PCM unit

机译：air-PCM单元热性能的实验研究

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In the present research paper thermal performance of an air-phase change material (PCM) unit has been experimentally studied. The influences of the air inlet temperatures and velocities have been investigated on the charging/discharging time of the PCM panels, heating/cooling load and effectiveness over the phase transition. These parameters play a vital on determining thermal performance of an air-PCM unit. Air inlet temperatures of 34 degrees C, 36 degrees C and 38 degrees C and air inlet velocities of 0.6 m/s, 1.6 m/s and 2.5 m/s. have been studied. The increase of the air inlet velocity reduced the charging and discharging time, however not linearly. The time for the complete melting and solidification is substantially reduced when the velocity has been increased from 0.6 m/s to 1.6 m/s. The air inlet temperature has been proved to be most important factor affecting the discharging time. For lower air inlet velocity the cooling and heating loads achieve lower values but remain nearly constant over a longer period of time. The effectiveness reaches its highest values for the air inlet velocity of 0.6 m/s for the charging and discharging processes. It has been concluded that discharging time can be extended by reducing the air inlet velocity and making the technology more suitable for heating and cooling applications for the buildings. A simplified methodology is proposed for the analysis of the PCM charging and discharging process through the identification of the critical points as result of the heat transfer behaviour in the air-PCM unit. (C) 2016 Elsevier Ltd. All rights reserved.
机译：在本研究论文中，已经对气相变化材料（PCM）单元的热性能进行了实验研究。研究了进气温度和速度对PCM面板充电/放电时间，加热/冷却负荷以及相变效率的影响。这些参数对于确定air-PCM单元的热性能至关重要。进气温度为34摄氏度，36摄氏度和38摄氏度，进气速度为0.6 m / s，1.6 m / s和2.5 m / s。已经研究过了。进气速度的增加减少了充电和放电时间，但是不是线性的。当速度从0.6 m / s增加到1.6 m / s时，完全熔化和固化的时间将大大减少。进气温度已被证明是影响放电时间的最重要因素。对于较低的进气速度，冷却负荷和加热负荷将达到较低的值，但在较长的时间段内几乎保持恒定。对于充气和放电过程，进气速度为0.6 m / s时，效率达到最高值。已经得出结论，可以通过降低进气速度并延长该技术的使用时间来延长排放时间，该技术更适合于建筑物的供热和制冷应用。提出了一种简化的方法，用于通过识别临界点来分析PCM充电和放电过程，这些临界点是空气PCM单元中的传热行为的结果。 （C）2016 Elsevier Ltd.保留所有权利。

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