Ultrasonic Guided Wave Phased Array Focusing Technology and Its Application to Defrosting Performance Improvement of Air-Source Heat Pumps
Ultrasonic Guided Wave Phased Array Focusing Technology and Its Application to Defrosting Performance Improvement of Air-Source Heat Pumps
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超声波导波相控阵聚焦技术及其在空气源热泵除霜性能改善中的应用
DOI：
10.3390/en12163117
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发表时间：
2019-08
期刊：
影响因子：
3.2
通讯作者：
Xu Guanghua
中科院分区：
文献类型：
--
作者：
Tan Haihui;Zhang Xiaofeng;Zhang Li;Tao Tangfei;Xu Guanghua
以往的研究表明，一个基本的霜层会对传热效率产生负面影响，并且很难使用单个超声波换能器去除。本文提出了一种超声相控阵技术用于蒸发器盘管的清洗。首先计算了导波在振子传递板和结霜翅片中的频散曲线，并利用MATLAB软件进行数值计算，确定了各超声振子的前进时间和不同速度下的超声近场压力。然后，根据提前时间，进行超声阵列聚焦，去除基础霜层。最后，对空气源热泵机组的能耗、供热焓差和性能系数进行了分析。理论分析、数值计算和实验结果一致表明，超声阵列聚焦补偿了能量耗散，扩大了有效聚焦面积。另外，Lamb波引起的垂直应力和SH波引起的横向剪应力均超过了基础霜层的抗拉强度和粘附应力。在超声应力作用和空化效应的共同作用下，基础霜层破裂并福尔斯脱落。在超声阵列激励下，空气源热泵机组的平均功率消耗从-3.27%下降到0.12%，而供热焓差从4.47%增加到10.86%。因此，COP的百分比增加在7.16%和11.12%之间，并且逆循环换能器的功耗是超声阵列换能器的3-12倍。
Previous studies have indicated that a basic frost layer negatively affects the heat-transfer efficiency and is difficult to remove using a single ultrasonic transducer. Herein, an ultrasonic phased array technology is proposed for evaporator coil defrosting. First, the dispersion curve of the guided wave in the vibration transfer plate and frosting fin is calculated, and the advance time of each ultrasonic vibrator and the ultrasonic near-field pressures under different velocities are determined through numerical calculations using the MATLAB software. Next, according to the advance time, ultrasonic array focusing is performed to remove the basic frost layer. Finally, the power consumption, heat-supply enthalpy difference, and coefficient of performance (COP) of the air-source heat pump (ASHP) unit are analysed. The theoretical analysis, numerical calculations, and experimental results consistently revealed that ultrasonic array focusing compensates for the energy dissipation and expends the effective defrosting area. Additionally, the perpendicular stress elicited by the Lamb wave and the differential transverse shear stress generated by the SH wave exceed the tensile strength and adhesion stress of the basic frost layer. The basic frost layer cracks and falls away, owing to the combination of the ultrasonic stress effect and the cavitation effect. The defrosting power consumption of the ASHP unit under ultrasonic array excitation decreases from −3.27% to 0.12%, whereas the heat-supply enthalpy difference increases from 4.47% to 10.86%. Therefore, the percentage increment of the COP is between 7.16% and 11.12%, and the power consumption of the reverse-cycle defrosting is 3–12 times that of ultrasonic array defrosting.
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影响因子：
11.2
作者：
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