An experimental study on the application of polyalcohol solid-solid phase change materials in solar drying with cross-corrugated solar air collectors

2017 International Conference on New Energy and Future Energy System

Gao, W.F.^1 ; Lin, W.X.^1,2 ; Liu, T.^1 ; Li, M.^1

Solar Energy Research Institute, Yunnan Normal University, Kunming

650500, China^1

School of Engineering and Physical Sciences, James Cook University, Townsville

QLD

4811, Australia^2

关键词: Drying chambers;    Heat charging;    Phase change temperature;    Solar air collector;    Solar drying systems;    Solid-solid phase change materials;    Temperature changing;    Thermal Performance;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/93/1/012075/pdf
DOI  :  10.1088/1755-1315/93/1/012075

来源: IOP

【 摘 要 】

In this paper, two identical solar driers with the same cross-corrugated solar air collectors and drying chamber were developed, one with phase-change materials (PCMs) and the other without PCMs. These two solar drying systems were tested in typical sunny and cloudy days in Kunming and their thermal performances were analyzed. The experimental results show that the temperature changing is smoother in the collector with the PCMs, which is beneficial for the drying as the useful drying time was prolonged. The same trend was also found in the chamber with the PCMs. The PCMs in solar drying system was found to play a role in temperature regulating. There were several cycles of heat charging-discharging in a cloudy testing day while the temperatures on collectors and in chambers with the polyalcohol PCMs is higher than each phase-change temperature. Nevertheless, there was only one cycle of heat charging-discharging in a sunny testing day. The collector with PCMs has higher daily useful heat gain than the collector without PCMs.