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Performance study of desiccant coated heat exchanger air conditioning system in winter

机译：冬季干燥剂涂层换热器空调系统性能研究

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Conventional air source heat pump system faces several challenges when adopted in winter season. Solid desiccant air conditioning system can provide humidification and heating power simultaneously and can be driven by low grade thermal energy; it provides a good alternative for air source heat pump systems. However, conventional solid desiccant air conditioning system adopts desiccant wheel with high cost as core component, which hinders the development of such system. Recently, desiccant coated heat exchanger (DCHE) with low initial cost and high efficiency was developed and this paper aims to investigate performance of DCHE air conditioning system adopted in Shanghai winter season. Performance of the system is predicted by a developed mathematical model where supply air states, mass of humidification and coefficient of performance (COP) are adopted as performance indices to evaluate the feasibility and energy utilization ratio of the system. Effects of regeneration water temperature on system performance are analyzed. It is found that under the simulation condition, relatively low regeneration temperature (such as 20 degrees C) cannot meet the designed standard and relatively high regeneration temperature (such as 40 degrees C) provides too much extra heating power, thus moderate regeneration temperature around 30 degrees C is recommended. Meanwhile, switch time is a crucial operation parameter for the system to obtain satisfied supply air, switch time from 40 s to 80 s and from 70 s to 240 s are recommended for transient and average supply air states, respectively. Both mass of humidification and COP increase with increasing regeneration temperature under simulation condition. Also, influences of ambient air temperature and humidity ratio on system performance are discussed to study the feasibility of such system regarding different climatic conditions. Results show that higher humidity ratio of ambient air results in increased humidity ratio of supply air, temperature of ambient air has neglectable effect on supply air. In conclusion, DCHE air conditioning system can be adopted for winter operation with moderate selection of regeneration temperature as well as switch time. (C) 2016 Elsevier Ltd. All rights reserved.
机译：传统的空气源热泵系统在冬季采用时面临着一些挑战。固态干燥剂空调系统可同时提供加湿和加热功率，并可由低等级的热能驱动；它为空气源热泵系统提供了很好的替代方案。然而，传统的固体除湿空调系统采用成本高的除湿轮作为核心部件，这阻碍了该系统的发展。近年来，开发了成本低，效率高的干燥剂涂层换热器（DCHE），旨在研究上海冬季使用的DCHE空调系统的性能。系统的性能由已开发的数学模型预测，其中将送风状态，加湿质量和性能系数（COP）用作性能指标，以评估系统的可行性和能源利用率。分析了再生水温度对系统性能的影响。发现在模拟条件下，较低的再生温度（例如20摄氏度）不能满足设计标准，较高的再生温度（例如40摄氏度）提供了过多的额外加热功率，因此适度的再生温度约为30摄氏度。建议摄氏度。同时，切换时间是系统获得满意的送风的关键操作参数，对于瞬态和平均送风状态，建议将切换时间分别从40 s更改为80 s和从70 s更改为240 s。在模拟条件下，加湿量和COP均随再生温度的升高而增加。此外，讨论了环境温度和湿度比对系统性能的影响，以研究该系统在不同气候条件下的可行性。结果表明，较高的环境空气湿度会导致供应空气的湿度比增加，环境空气的温度对供应空气的影响可忽略不计。总之，DCHE空调系统可在冬季运行时采用，再生温度和切换时间的选择适中。 （C）2016 Elsevier Ltd.保留所有权利。

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