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首页> 外文期刊>Journal of enhanced heat transfer >OVERALL HEAT LOSS FROM BOTH SIDES OF A TILTED UNGLAZED SOLAR COLLECTOR UNDER INDOOR CONDITIONS USING FLOW CALORIMETRY AND THERMOGRAPHY
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OVERALL HEAT LOSS FROM BOTH SIDES OF A TILTED UNGLAZED SOLAR COLLECTOR UNDER INDOOR CONDITIONS USING FLOW CALORIMETRY AND THERMOGRAPHY

机译：流动量热法在室内条件下倾斜的未上釉的太阳能集热器的两个方向的总热损失

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摘要

An experimental investigation of the overall heat loss on a flat plate absorber solar collector in the natural convection regimen from both sides of the plate is presented in terms of the heat transfer coefficient, U-L. The study considers variations of the inclination angle with respect to the horizontal axis and the input-ambient temperature difference. The experiments were based on the steady-state energy balance under controlled indoor conditions, using heat flow calorimetry and infrared imaging. The U-L value was determined in the range of 0 degrees-90 degrees. for the tilt angle and 3.3-34.1. degrees C for the inputambient temperature difference. It can be seen that the U-L value changes by 9.7% due to the plate tilt angles and 16.8% due to the input-ambient temperature difference over the working range. The maximum U-L value was found at a 45. flat plate tilt angle, slightly decreasing as it changes its position vertically or horizontally. The U L value varies nearly linearly with the input-ambient temperature difference, with a slope of 0.035 W/m(2) K/K. The two-variables correlation was obtained of the U-L value, which agrees well with a root-mean-square error of 0.12 W/m(2) K(R-2= 0.97). Therefore, with a non-considerable wind effect on unglazed solar collectors, the U-L value is affected as the tilt angle and input-ambient temperature difference change with regard to the characterization parameters.
机译：根据传热系数U-L，对平板吸收器太阳能集热器在自然对流方式下从板的两侧进行的总体热损失进行了实验研究。研究考虑了相对于水平轴的倾斜角和输入环境温度差的变化。实验是基于热流量热法和红外成像在受控室内条件下的稳态能量平衡进行的。在0度至90度的范围内确定U-L值。倾斜角和3.3-34.1。 C为输入环境温度差。可以看出，由于板的倾斜角度，U-L值变化了9.7％，而由于在整个工作范围内的输入环境温度差，导致U-L值变化了16.8％。在45°平板倾斜角处发现了最大的U-L值，随着垂直或水平方向位置的改变，U-L值略有减小。 U L值随输入环境温度差几乎线性变化，斜率为0.035 W / m（2）K / K。 U-L值获得了两个变量的相关性，与0.12 W / m（2）K（R-2 = 0.97）的均方根误差非常吻合。因此，在未上釉的太阳能集热器上产生不可思议的风效应时，U-L值会随着倾斜角和输入环境温度差相对于特征参数的变化而受到影响。

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