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首页> 外文会议>International Refrigeration and Air Conditioning Conference at Purdue >Experimental Investigation of Frost Formation in a Finned-Tube Evaporator under Simulated Real Operation Conditions
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Experimental Investigation of Frost Formation in a Finned-Tube Evaporator under Simulated Real Operation Conditions

机译：模拟实际操作条件下翅片管蒸发器中霜形成的实验研究

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Finned tube evaporators are used in a wide range of application such as commercial and industrial cold/freezed storage rooms with high traffic loading under frosting conditions. During the literature survey it has been realized that there is not enough experimental and visual data regarding the unit cooler tested with casing and fan integrated as in real operating conditions. As it is known, the usage of fan and evaporator external case and non-optimum distributor design may affect air and refrigerant side distribution, capacity and frost formation along the fins with respect to degree of maldistribution. In this paper, an evaporator with an integrated fan was manufactured and tested at under frosting conditions by only changing air flow rate at ambient balanced type test laboratory in contrast with testing at wind tunnel and more uniform flow distribution. During the test, operation performed according to three different air flow rate separately. The parameters concerning test operation such as the changes of air temperature, air relative humidity, surface temperature, air-side pressure drop and refrigerant side capacity etc. were followed in detail for each air flow rate. At the same time, the digital and thermal images were captured in front of heat exchanger; thus, the frost temperature distributions, blockage ratios and frost thicknesses occurring throughout all surfaces were investigated. In this study the effect of air flow rate on frosting has been investigated. The test and visual results showed that the trendline of air side pressure drop has increased slowly at the first stage of test operations, then this phenomena has increased linearly up to a top point and then the linearity has disrupted instantly and this point has admitted beginning of defrost operation for each case. On the other hand, the refrigerant capacities were declined continuously during the test operations. When examining visual and thermal images captured at certain time intervals, it was shown an uneven frost layers and detected the temperature distributions in front of evaporator as different degree for each case via thermal and digital camera. Similarly, the frost thicknesses distribution with time occurring at the specific area of each circuit was identified via Matlab Image Process Program. Moreover, the initial period of frost growth, which have significant impact on further frost growth, was investigated via a microscope camera.
机译：翅片管蒸发器用于广泛的应用，如商业和工业冷/冷冻储存室，在冻干条件下具有高交通负荷。在文献调查中，已经意识到，没有关于在实际操作条件下与壳体和风扇测试的单元冷却器的实验和视觉数据没有足够的实验和视觉数据。如已知的，风扇和蒸发器外壳的使用和非最佳分配器设计可能影响沿着翅片的空气和制冷剂侧分布，容量和霜形成程度。在本文中，通过在环境平衡型测试实验室的空气流速相比，在玻璃状速率和更均匀的流动分布时，通过在环境平衡型测试实验室的空气流速下，制造和测试具有集成风扇的蒸发器。在测试期间，单独根据三种不同的空气流量进行操作。对每个空气流速进行详细地接下来，对测试操作的参数如测试操作，例如空气温度，空气相对湿度，表面温度，空气侧压降和制冷剂侧容量等。同时，在热交换器前面捕获数字和热图像;因此，研究了整个表面发生的霜温分布，堵塞比和霜厚度。在这项研究中，研究了空气流速对冻剂的影响。试验和视觉结果表明，在测试操作的第一阶段，空气侧压降的趋势线增加，然后这种现象直接增加到顶点，然后线性地扰乱了，这一点已被录取开始针对每种情况的除霜操作。另一方面，在测试操作期间，制冷剂容量连续下降。当以特定时间间隔检查捕获的视觉和热图像时，通过热量和数码相机将蒸发器前面的温度分布检测到蒸发器前面的温度分布。类似地，通过MATLAB图像处理程序识别在每个电路的特定区域发生时发生的霜厚度分布。此外，通过显微镜摄像头研究了对进一步霜冻生长产生重大影响的霜生长的初始期。

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