Investigation on the ultrasonic propagation mechanism and its application on air-source heat pump defrosting
Investigation on the ultrasonic propagation mechanism and its application on air-source heat pump defrosting
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超声波传播机理及其在空气源热泵除霜中的应用研究
DOI：
10.1016/j.applthermaleng.2016.06.185
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发表时间：
2016-08
影响因子：
6.4
通讯作者：
Luo Ailing
中科院分区：
文献类型：
--
作者：
Tan Haihui;Xu Guanghua;Tao Tangfei;Zhang Sicong;Luo Ailing
空气源热泵（ASHP）机组室外盘管结霜严重影响机组的运行性能和能效。因此，定期检查是必要的。首先，通过数值计算确定了超声导波在蒸发器中传播机理的频散曲线。此外，利用有限元法分析了超声激励下的剪切应力和振动特性。最后分析了超声振动的振幅和阻尼性能。数值计算结果表明，蒸发器中存在三种导波模式，即兰姆波的A0和S0模式以及SH波的SH0模式，其中兰姆波的S0模式是最佳的导波模式。结果表明，翅片和管中存在明显的S0模态和纵向模态振型，管中也存在扭转和弯曲模态，有限元计算结果与数值计算结果一致。阻抗分析和激光测振仪测试结果表明，外载荷的增加导致了谐振频率的偏移、电声转换效率和振动能量的降低。超声振动抑制翅片表面霜存款的实验结果表明，超声振动可以抑制翅片表面霜的沉积。
Frosting deposited on the outdoor coil of air-source heat pump (ASHP) units deteriorates the operational performance and energy efficiency. Therefore, periodic defrosting is necessary. First, the dispersion curves for the propagation mechanism of an ultrasonic guided wave in the evaporator are determined through numerical calculation. In addition, the shear stress and vibration characteristics under ultrasonic excitation are analysed using finite element method (FEM). Finally, the vibration amplitude and defrosting performance of ultrasonic vibration is analysed. The numerical calculation results indicate that three guided wave modes exist in the evaporator, including both A0 and S0 modes of the Lamb wave and SH0 mode of the SH wave, with the optimal defrosting mode being S0 of the Lamb wave. The FEM results show that the vibrational shapes of S0 mode and longitudinal mode clearly exists in the fin and tube, the torsional and flexural modes also exist in the tube, and the FEM results are consistent with the numerical calculation results. The impedance analysis and laser vibrometer results indicate that the resonance frequency shifting, electro-acoustic converting efficiency and vibration energy decrease is due to increasing external load. The ultrasonic defrosting experimental results indicate that ultrasonic vibration can suppress frost deposit on the fin surface.
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间歇超声振动翅片管蒸发器除霜性能实验研究
影响因子：
11.2
作者：
Tan Haihui;Xu Guanghua;Tao Tangfei;Sun Xiaoqi;Yao Wudong
通讯作者：
Yao Wudong
影响因子：
2.4
作者：
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影响因子：
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作者：
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DOI：
10.1016/j.ijrefrig.2015.07.004
发表时间：
2016-06-01
期刊：
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
影响因子：
--
作者：
Ge, Yijing;Sun, Yuying;Liu, Jingdong
通讯作者：
Liu, Jingdong
影响因子：
11.2
作者：
Jaehong Kim;Hwanjong Choi;K. Kim
通讯作者：
Jaehong Kim;Hwanjong Choi;K. Kim