Theoretical and experimental studies of impacts of heat shields on heat pipe evacuated tube solar collector

2019 ◽  
Vol 138 ◽  
pp. 999-1009 ◽  
Author(s):  
Xiaona Huang ◽  
Qiliang Wang ◽  
Honglun Yang ◽  
Shuai Zhong ◽  
Dongsheng Jiao ◽  
...  
Keyword(s):  
Heat Pipe ◽  
Solar Collector ◽  
Experimental Studies ◽  
Evacuated Tube Solar Collector ◽  
Heat Shields ◽  
Evacuated Tube

Computational Fluid Dynamics Modeling of a Heat Pipe Evacuated Tube Solar Collector Integrated With Phase Change Material

2019 ◽  
Author(s):  
Vivek R. Pawar ◽  
Sarvenaz Sobhansarbandi
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Energy Storage ◽  
Phase Change ◽  
Heat Pipe ◽  
Solar Collector ◽  
Cfd Modeling ◽  
Real Field ◽  
Evacuated Tube Solar Collector ◽  
Evacuated Tube

Abstract The increase in greenhouse gas and other global warming emissions makes it necessary to utilize renewable energy sources such as solar energy with high potential for heat production by means of solar thermal collectors. Among various types of solar collectors, evacuated tube solar collector (ETC) has attracted many attentions specially for the application in solar water heater systems (SWHs). However, due to the intermittence in solar intensity during the day, the ETCs may not work at their maximum functionality. There are number of studies investigating the effect of energy storage materials to eliminate the mismatch between supply and demand during peak hours. In the recent work of the authors, application of phase change materials (PCMs) integrated directly within the ETCs is studied experimentally. In this study, the computational fluid dynamics (CFD) modeling of heat pipe evacuated tube solar collector (HPETC) is performed. In order to cross-validate the obtained results to the recent experimental analysis, the boundary conditions are set as the real field-testing data. In the first part of the study, the 3D model of commercially available HPETC is simulated, while in the second part the HPETC integrated with the PCM is developed to analyze the improved thermal distribution. The selected type of PCM is Tritriacontane paraffin (C33H68), with a melting point of 72 °C and latent heat capacity of 256 kJ/kg. The simulation results show a acceptable agreement between the CFD modeling and the experimental data. The results from this study can be the benchmark for efficiency improvement of the ETCs in thermal energy storage systems.

Thermal Performance of a Heat-Pipe Evacuated-Tube Solar Collector

2021 ◽  
pp. 125-135
Author(s):  
Wayan Nata Septiadi ◽  
I. Ketut Gede Wirawan ◽  
I. Putu Agus Saskara Yoga ◽  
Gerardo Janitra Puriadi Putra ◽  
Sulthan Alif Ramadhan Lazuardy
Keyword(s):  
Heat Pipe ◽  
Thermal Performance ◽  
Solar Collector ◽  
Evacuated Tube Solar Collector ◽  
Evacuated Tube
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