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为了探究溶液除湿/再生过程热质耦合传递的不可逆性，提出焓(火积) Eh概念，导出焓(火积)耗散数 Eh~*，研究 Eh~*和等效热容比 C*、焓效率εh及传热单元数(NTU)的变化关系，同时建立基于 Eh~*的顺/逆流除湿/再生器性能预测解析模型，分析 Eh~*对装置性能的影响。结果表明，Eh~*与εh近似呈负线性关系，且随 C*减小而逐渐增大，随 NTU 变大逐渐减少趋于稳定；当 Eh~*较小时，除湿/再生程度更深，而当 Eh~*趋近于 1 时，除湿/再生的热质传递趋于停止；在相同 Eh~*下，溶液进口温度和流量比对装置性能影响更大。
Abstract：In order to study the irreversibility of coupled heat and mass transfer processes of parallel/counter flow solution dehumidification/regeneration, a concept of enthalpy entransy Eh was proposed,and the enthalpy entransy dissipation number Eh~* of solution dehumidification/regeneration was deduced. Its relationship with the equivalent heat capacity ratio C*, the number of heat transfer unit (NTU) and the enthalpy efficiency εh were obtained, respectively. Moreover, an analytical model of dehumidifier/regenerator based on Eh~* was established,and the effect of the enthalpy entransy dissipation number Eh~* on the performance of dehumidifier/regenerator was analyzed. The results show that the E_h* shows negative linearity relationship with the εh, and it increases with the decrease of C* and decreases to a stable value with the increase of NTU. The degree of heat and mass transfer processes taking place between the solution and air is deeper when E_h* is smaller, while their processes tend to stop when E_h* approaches 1.0. At constant E_h*, the solution inlet temperature and the flow-rate ratio have more significant effects on the performance of the device.
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基本信息:
中图分类号:TU834.9
引用信息:
[1]彭冬根,曹卓.基于焓(火积)耗散数的绝热型溶液除湿/再生器性能预测解析模型[J],2022,36(04):543-553.
基金信息:
国家自然科学基金(51766010);; 江西省研究生创新专项资金(YC2019-S002);; 南昌市高效制冷知识创新团队(2018-CXTD-004)