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GREATLAB在Applied Thermal Engineering发表论文(2022年07月15日)

由成家豪、余文等撰写的论文Evaluation of heat pump dryers from the perspective of energy efficiency and operational robustness在Applied Thermal Engineering 2022年第215卷在线发表。作者深入探讨了不同构型的闭式热泵烘干系统的能效和运行稳健性,并以海苔(紫菜)烘干系统为例,验证了设计方法和模型精度。

论文链接

论文摘要:

Vapor compression heat pump dryers (HPDs) are widely applied in food and industrial drying. Many efforts have been devoted to evaluating the HPD performance from the perspectives of energy, exergy, economy, etc. The current work offers a perspective of both energy efficiency and operational robustness to evaluate HPDs, intending to measure their design and off-design performance for various drying applications. Based on the proposed method, a case study on conveyor seaweed drying is presented. The preferable system(s) are found out among three candidates in general use, i.e., the basic heat pump dryer HPDbasic, the HPD with air bypass HPDbypass, and the HPD with air bypass and subcooler HPDsubcooler. The results show that, HPDbasic is not applicable for seaweed drying due to the required huge circulating air flow rate. HPDbypass and HPDsubcooler are more preferred with better energy performance and operational robustness. Moisture extraction rate (MER) of 30.4 kg/h and specific moisture extraction rate (SMER) of 2.20 kg/kWh are reached in HPDbypass at the design condition (Tdb = 45 °C, RH = 0.4), and are further increased to 35.8 kg/h and 2.58 kg/kWh in HPDsubcooler. Meanwhile the off-design robustness indices are 0.14 and 0.22 for HPDbypass and HPDsubcooler, and can be enlarged to 0.19 and 0.33 after reselecting a compressor withstanding condensing temperature up to 58 °C (2 °C higher). Besides, HPDbypass and HPDsubcooler can bear at least 30% air leakage in operation. Finally, operational robustness on other applications is also discussed for conveyor and batch dryers.

    
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