scholarly journals Numerical and Experimental Study on Energy Performance of Photovoltaic-Heat Pipe Solar Collector in Northern China

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Hongbing Chen ◽  
Xilin Chen ◽  
Sai Chu ◽  
Lei Zhang ◽  
Yaxuan Xiong
Keyword(s):  
Heat Pipe ◽  
Water Flow ◽  
Thermal Efficiency ◽  
Solar Collector ◽  
Water Flow Rate ◽  
Northern China ◽  
Energy Performance ◽  
Good Choice ◽  
Water Type ◽  
Pv Panel

Several studies have found that the decrease of photovoltaic (PV) cell temperature would increase the solar-to-electricity conversion efficiency. Water type PV/thermal (PV/T) system was a good choice but it could become freezing in cold areas of Northern China. This paper proposed a simple combination of common-used PV panel and heat pipe, called PV-heat pipe (PV-HP) solar collector, for both electrical and thermal energy generation. A simplified one-dimensional steady state model was developed to study the electrical and thermal performance of the PV-HP solar collector under different solar radiations, water flow rates, and water temperatures at the inlet of manifold. A testing rig was conducted to verify the model and the testing data matched very well with the simulation values. The results indicated that the thermal efficiency could be minus in the afternoon. The thermal and electrical efficiencies decreased linearly as the inlet water temperature and water flow rate increased. The thermal efficiency increased while the electrical efficiency decreased linearly as the solar radiation increased.

311 Study on the dropping water type air conditioning : the effect of between heat load and water flow rate

2005 ◽  
Vol 2005.44 (0) ◽  
pp. 100-101
Author(s):  
Shoutaro TAKAHASHI ◽  
Masayoshi KOBIYAMA ◽  
Kiyoshi ENOKI ◽  
Makoto SHIMODA
Keyword(s):  
Water Flow ◽  
Flow Rate ◽  
Heat Load ◽  
Air Conditioning ◽  
Water Flow Rate ◽  
Water Type

Prediction of top water flow rate to SAGD steam chamber and its impact on thermal efficiency

2021 ◽  
pp. 108976
Author(s):  
Qi Jiang ◽  
Jiali Liu ◽  
Zhongyuan Wang ◽  
Guanchen Jiang ◽  
Siyuan Huang ◽  
...  
Keyword(s):  
Water Flow ◽  
Flow Rate ◽  
Thermal Efficiency ◽  
Water Flow Rate ◽  
Steam Chamber

scholarly journals Experimental Diagnosis of the Heat Pipe Solar Collector Malfunction. A Case Study

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3050
Author(s):  
Pawel Znaczko ◽  
Emilian Szczepanski ◽  
Kazimierz Kaminski ◽  
Norbert Chamier-Gliszczynski ◽  
Jacek Kukulski
Keyword(s):  
Heat Pipe ◽  
Geometric Structure ◽  
Thermal Efficiency ◽  
Solar Collector ◽  
Experimental Investigations ◽  
Manufacturing Processes ◽  
Solar Systems ◽  
University Of Technology ◽  
Working Medium

Work was carried out to diagnose irregularities in the operation of a vacuum-tube solar collector. Experimental investigations of the collector were carried out at the solar collector field test stand in the Laboratory of Solar Collectors at the Koszalin University of Technology. The scope of the work included the following: research on thermal efficiency characteristics, research on the temperature distribution on the solar collector manifold, and research on the geometric structure of the heat pipe and filling with the working medium. Based on the diagnostic tests carried out, the occurrence of incorrect sedimentation in the condenser on the neck of the heat pipe (44%) and an incorrect amount of working medium (66%) were found. The results show that the functioning of the heat pipe significantly depends on its geometric structure and the amount of working medium. Any irregularity at the production stage contributes to a reduction in the thermal efficiency of the solar collector. The results of the experimental research presented in this paper can be used in the diagnostic analyses of solar systems as well as in the organisation of the manufacturing processes of these systems.

scholarly journals Design and verification of ultra-high temperature lithium heat pipe based experimental facility

2021 ◽  
pp. 263-263
Author(s):  
Chongju Hu ◽  
Dali Yu ◽  
Meisheng He ◽  
Taosheng Li ◽  
Jie Yu
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
Water Flow ◽  
Flow Rate ◽  
Water Flow Rate ◽  
Cooling Water ◽  
Heating Power ◽  
Normal Operation ◽  
Experimental Facility ◽  
Cooling Water Flow Rate

Lithium heat pipe has broad applications in heat pipe cooled reactors and hypersonic vehicles due to its ultra-high working temperature which is around 1700 K. In this paper, a lithium heat pipe based experimental facility has been designed to test the heat transfer performance of the lithium heat pipe. A simplified mathematical model of heat pipe has been implemented into a CFD approach, which is used to verify the design of lithium heat pipe and its experimental facility. Results showed that the CFD approach is in good agreements with some well-known existing models and experimental data, and deviation between the results is within 5% range. The adjustment range of mixed gas thermal resistance and cooling water flow rate was obtained by analyzing the effects of different cooling conditions on the performance of the experimental facility. It is necessary to ensure the cooling water flow rate is above 0.11l/h to prevent water boiling when the heating power is10kW around, and the optimal proportion of helium is 70% -90%.The operation characteristics of the lithium heat pipe under unsteady state with varying heating power were simulated numerically. The results show that the proportion of helium must be less than 60% for normal operation of the lithium heat pipe. This work provides a reference and numerical verification for the design of lithium heat pipe based experimental facility, which can be used to reveal the heat transfer mechanisms of the lithium heat pipe during the experiment.

scholarly journals Increasing photovoltaic panel power through water cooling technique

2017 ◽  
Vol 2 (1) ◽  
Author(s):  
Calebe Abrenhosa Matias ◽  
Licínio M. Santos ◽  
Aylton J. Alves ◽  
Wesley P. Calixto
Keyword(s):  
Water Flow ◽  
Cooling System ◽  
Water Flow Rate ◽  
Front Surface ◽  
Climatic Conditions ◽  
Net Energy ◽  
Water Cooling ◽  
Photovoltaic Panel ◽  
Reuse Water ◽  
Pv Panel

This paper presents the development of a cooling apparatus using water in a commercial photovoltaic panel in order to analyze the increased efficiency through decreased operating temperature. The system enables the application of reuse water flow, at ambient temperature, on the front surface of PV panel and is composed of an inclined plane support, a perforated aluminum profile and a water gutter. A luminaire was specially developed to simulate the solar radiation over the module under test in a closed room, free from the influence of external climatic conditions, to carry out the repetition of the experiment in controlled situations. The panel was submitted to different rates of water flow. The best water flow rate was of 0.6 L/min and net energy of 77.41Wh. Gain of 22.69% compared to the panel without the cooling system.

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