A Study on Polymer Electrolyte Membrane (PEM)-Based Electrolytic Air Dehumidification for Sub-Zero Environment
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Electrolytic dehumidification with polymer electrolyte membrane (PEM) is a compact and effective independent humidity control method for refrigerators. To explore the performance of PEM-based dehumidification under sub-zero conditions, experiments were conducted at low temperatures of −10–0 °C. Results showed that this device could operate stably at temperatures above −8.5 °C. The moisture removal rate was 0.05–0.08 × 10−9 g/s, and the energy efficiency was 0.64–0.68 × 10−2 g/(J m2), respectively. It has also been found that the moisture removal rate and energy efficiency decreased with the decrease of absolute humidity in the air. Furthermore, the performance under sub-zero conditions was relatively low, which the dehumidification rate at −8.5 °C was only 1/6 of that at 25 °C. The possible reason is that water inside the PEM may be frost, hindering the proton transmission below 0 °C. Besides, the electrical conductivity also reduces due to the low temperature. This study proved that PEM-based dehumidification is a promising alternative for independent humidity control under low-temperature conditions.
KeywordsElectrolytic dehumidification Refrigerator Sub-zero environment Independent humidity control Experiments
Mass flow rate
The project is supported by the National Key Research and Development Program (No. 2016YFB0901404), National Natural Science Foundation of China (51876067), the National Science Fund for Distinguished Young Scholars of Guangdong Province (2018B030306014). It is also supported by the Science and Technology Planning Project of Guangdong Province: Guangdong–Hong Kong Technology Cooperation Funding Scheme (TCFS), No.2017B050506005.
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