一种新型热风干燥系统的节能分析

Analysis on Energy Conservation of a New Type Hot-air Drying System

本文提出了一种新型热风干燥系统一热泵／转轮联合热风干燥系统（HDSHR），介绍了它的系统组成和工作原理。通过热力学分析得出，在某些工况下，HDSHR比热泵干燥系统（HPDS）和转轮热风干燥系统（HDSR）都节能。以干燥系统的单位能耗除湿量（SMER）为性能指标，制冷系统采用环保工质R134a、最高冷凝温度为80℃、采用氯化锂除湿转轮，再生温度70℃时，确定了HD-SHR最佳工况：制冷剂的蒸发温度是20℃、干燥温度范围是55～70℃。在此工况范围内进行了计算，得出HDSHR的SMER值在1．545～2．168之间，HPDS的SMER值在0．813-1．125之间。可见，在最佳干燥温度范围内HDSHR具有显著的节能效果。

A new type hot - air drying intergrated system of heat pump and rotary desiccant wheel （HDSHR） is proposed, and the system configration and its working principle are introduced. Thermodynamic analysis results show that on some working condition, HDSHR is more energy - efficient than both heat pump drying system （HPDS） and hot - air drying system of rotary desiccant wheel （HDSR）. Using the specific moisture extraction rate （ SMER ） as performance index, R134a as the working fluid in refrigeration system, and when the maximum condensation temperature is 80℃ and the regeneration temperature of the LiBr rotary desiccant wheel is 70℃, we have determined the optimal working paremeters： the evaporation temperature of refrigeration system is 20℃ and the drying temperature of HDSHR ranges from 55℃ to 70℃. We have also calculated the SMER in its optimal drying temperature conditions, e.g. the SMER values of HDSHR ranges from 1.545 to 2. 168 and that of HPDS ranges from 0. 813 to 1. 125. The results showed that HDSHR has a remarkable energy - ef- ficient performance.