| Power abd Energy Engineering |
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| Exergy analysis of heat transfer elements of corrugated plate with perforations |
| LI Peng cheng1,2, SUN Zhi jian1,2, HUANG Hao1,2, CHENG Gong1,2, HU Ya cai1,2 |
| 1. Institute of Thermal Science and Power Systems, Zhejiang University, Hangzhou 310027；2. Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Hangzhou 310027 |
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Abstract A thermodynamic exergy analysis method was adopted in order to solve the problem that it is hard to evaluate the performance of corrugated plate heat transfer elements with perforations. Exergy loss curve and exergy loss coefficient curve were obtained by using transient test method. The curves both have a turning point at Reynolds number of about 4 400,and achieve the peak value at the turning point. The turning point was derived from the transition state that has violent irregular intense motions, and the entropy increases with the rising Reynolds number, making exergy loss and exergy loss coefficient get the maximum value of 41 kJ and 0.65, respectively. Turning point is the critical point of transition state to fully turbulent. The result shows that the exergy analysis method can evaluate the effect of heat transfer enhancement reasonably, and serious energy waste happens near the turning point.
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Published: 01 February 2016
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带扰流孔波纹板蓄热元件的分析
针对带扰流孔波纹板蓄热元件强化传热的综合效果较难评价的问题,提出基于热力学定律的分析方法.采用瞬态实验方法得到了损与损系数随雷诺数的变化曲线,曲线表明损和损系数在雷诺数为4 400左右有一个转折点,转折点处损和损系数的数值均达到峰值.转折点存在的原因为流体的流态处于过渡态时流体的无规则运动变化剧烈,导致流体的熵增会随雷诺数的增大而增大使损和损系数数值达到最大,分别为41 kJ、0.65.转折点即为流体流态从过渡态转变到完全湍流的临界点.结果表明,分析方法可较合理地评价强化传热综合效果且转折点附近能量浪费严重.
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