Effect of non-uniform air velocity distribution on evaporator performance and its improvement on a residential air conditioner
Effect of non-uniform air velocity distribution on evaporator performance and its improvement on a residential air conditioner
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家用空调风速不均匀分布对蒸发器性能的影响及其改进
DOI：
10.1016/j.applthermaleng.2012.02.024
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发表时间：
2012-07
影响因子：
6.4
通讯作者：
黄东
中科院分区：
文献类型：
--
作者：
黄东
采用数值模拟和实验相结合的方法，研究了风速分布不均匀对多回路蒸发器性能的影响。实验测量了蒸发器上的非均匀风速分布，并对相应的蒸发器性能进行了测试和数值模拟。在等风量均匀配风条件下，对蒸发器的性能进行了数值模拟。结果表明，非均匀配风下蒸发器的蒸发量比均匀配风下蒸发器的蒸发量减少了7.78%。蒸发器容量的降低主要是由于第一排较低管的总传热系数较小，因为总传热系数在较小的空气流速下变化显著，而在较大的空气流速下变化平缓。在蒸发器的背衬板上安装两块三角形导风板，使部分气流向蒸发器底部偏转，以提高下部管的风速，减小较小风速所覆盖的面积。实验结果表明，设置导风板可以减少高温风和低温风的混合损失，从而降低出口空气的干、湿温度。最终，制冷量和能效比分别提高了3.02%和5.1%。
The effect of non-uniform air velocity distribution on performance of a multi-circuit evaporator was studied numerically and experimentally. The non-uniform air velocity distribution on evaporator was measured experimentally, and its corresponding evaporator performance was tested and approximated numerically. The evaporator performance was also investigated numerically at the equal airflow rate but under uniform air distribution. The results showed that the evaporator capacity under non-uniform air distribution was decreased by 7.78% than that under uniform air distribution. The decrease in evaporator capacity was mainly attributed to smaller overall heat transfer coefficient of lower tubes with smaller air velocity in first row because overall tube heat transfer coefficient varied remarkably at smaller air velocity and gently at greater air velocity. Two triangle air guide plates were installed on sheet backing of evaporator to deflect part of airflow towards evaporator bottom to increase air velocity of lower tubes and to decrease the area that smaller air velocity covered. The experimental results showed air guide plates decreased blend loss of high temperature air leaving upper circuits and low temperature air leaving lower circuits, thus decreasing outlet air dry and wet temperatures. Finally, the cooling capacity and EER were increased by 3.02% and 5.1%, respectively.
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影响因子：
6.4
作者：
A. Aganda;J. Coney;C. Sheppard
通讯作者：
A. Aganda;J. Coney;C. Sheppard
DOI：
10.1016/s0017-9310(99)00333-6
发表时间：
2000-08
影响因子：
5.2
作者：
Chi-Chuan Wang;K. Chi;C. Chang
通讯作者：
Chi-Chuan Wang;K. Chi;C. Chang
DOI：
10.1016/j.ijrefrig.2009.01.013
发表时间：
2009-09
期刊：
International Journal of Refrigeration-revue Internationale Du Froid
影响因子：
--
作者：
Jun-Hyeung Kim;J. Braun;E. Groll
通讯作者：
Jun-Hyeung Kim;J. Braun;E. Groll
影响因子：
3.2
作者：
MOFFAT, RJ
通讯作者：
MOFFAT, RJ
影响因子：
2.3
作者：
M. G. Beiler;D. Kröger
通讯作者：
M. G. Beiler;D. Kröger