Study on design and thermal characteristics of vacuum tube solar collector intubated with heat storage tube

He, Ya‐Ling; Xiao, Lixian; Yang, Yongrong

doi:10.1002/er.4773

Cited by 8 publications

(5 citation statements)

References 10 publications

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“…At the same operating temperature, the methanol conversion rate of the indirect heating reactor is higher than that of an electric furnace reactor. Yongtai et al (2019) [13] studied the thermal characteristics of the heat storage tube and vacuum tube solar collector. Based on the structure of the heat storage vacuum tube, the internal energy conversion, transmission, and storage theories are formed.…”

Section: Design Optimization Of Electronic Heat Absorption Equipment ...mentioning

confidence: 99%

Simulation Experiment of Heat Transfer Tubes for Electronic Heat Absorber in Thermal Power Generation System of Power Plants

2022

IJOMAM

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The study aims to improve the performance of the thermal power generation system in power plants by analyzing its working principle. The thermal power generation system of large power plants is taken as the research object. The Fluent software is used for simulation experiments. A new optimization method of the rotor structure in the electronic heat absorption equipment and heat exchange pipeline is proposed. By improving the rotor, the heat transfer efficiency of the heat exchange pipeline is greatly improved. Through the relevant research on the thermal power generation system, the rotor's heat transfer performance of the exchange tube is analyzed based on the strong heat transfer convection mechanism. Then the simulation experiment is carried out. Based on the heat transfer mechanism of the combined rotor in the tube path unit, the heat transfer pipe is optimized. The numerical simulation results of rotor heat transfer and fluid flow show that the average resource utilization rate increases with time. The average resource utilization efficiency of the system reaches more than 70% in 45 ms. When the pipe size is 100 mm, the performance of the resistance coefficient is 3.6 before improvement and 2.8 after improvement. When iteration times are 200, the rotor heat transfer of four kinds of pipes reaches the maximum, and the rotor heat transfer of No. 1 pipe with the size of 22 mm can reach 10000W. The research demonstrates the superiority of the proposed heat exchange tube, which provides a theoretical reference for optimizing the heat transfer tube and the efficiency of the thermal power generation system.

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Section: Design Optimization Of Electronic Heat Absorption Equipment ...mentioning

confidence: 99%

Simulation Experiment of Heat Transfer Tubes for Electronic Heat Absorber in Thermal Power Generation System of Power Plants

2022

IJOMAM

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“…The other type is a U-tube ETSC, which is the same concept, except that the heat pipe is changed to a copper tube that goes into the evacuated tube and comes back to the header again so that it has an inlet header and an outlet header. 19…”

Section: Evacuated Tube Collectormentioning

confidence: 99%

“…All the heat pipes are connected to the header which allows the heat to be transformed from the heat pipes to the fluid inside the tank. The other type is a U ‐tube ETSC, which is the same concept, except that the heat pipe is changed to a copper tube that goes into the evacuated tube and comes back to the header again so that it has an inlet header and an outlet header 19 …”

Section: Introductionmentioning

confidence: 99%

Energy and exergy analysis for stationary solar collectors using nanofluids: A review

Eltaweel

Abdel‐Rehim

2020

Int J Energy Res

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Summary Fossil fuels demonstrate pollution effects and significant emissions on the atmosphere, which made the use of clean, renewable sources of energy a necessity. Renewable energy has many sources, but the most promising and cheapest energy source is solar energy, which has led to a focus on efficient solar energy harvesting to be cheaper for public use. Stationary solar collectors like evacuated tube and flat‐plate solar collectors are the most commonly used solar collectors for their simplicity of installation and maintenance. They are mostly used for domestic applications such as solar water heaters. Nanofluids can improve the thermal properties of the working fluid which can improve the performance of a collector. This review paper discussed the effect of different parameters on the stationary solar collector's performance, such as nanoparticle use, nanoparticle size, concentration, and the base fluid of the nanofluid. This review paper also aims to summarize previous studies performed on the use of different nanofluids on the two types of circulation that can be either thermosiphon or forced circulation for both collectors to investigate the energetic and exergetic efficiencies. The theoretical performance analysis equations of stationary solar collectors are provided too. From the reviewed results, it was concluded that a substantial improvement in both the energetic and exergetic efficiencies of both collectors had been obtained from the use of carbon‐based nanofluids compared to a significant number of different nanofluids. The paper also discusses the significant challenges of nanofluid use and how to overcome them in stationary solar collectors.

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“…Therefore, many researchers are interested in studying the phase change materials (PCM) and using them with solar heaters in order to store heat for a longer time. In solar air heaters integrated with PCM, many researchers have experimented the effect of using acetamide (Mehla and Yadav 2018 ), paraffin (Abokersh et al 2017 ; Algarni et al 2020 ; Essa et al 2018 ; Z. Wang et al 2020 ), and other materials such as stearic acid, mannitol-graphite, and erythritol (Chopra et al 2019 ; Li and Zhai 2017 ; Yongtai et al 2019 ). All found that PCM increases the efficiency of thermal performance and thermal storage, where the heat lasts longer after the disappearance of sunlight.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of solar air heater performance with evacuated tubes connected in series and involving nano-copper oxide/paraffin wax as thermal storage enhancer

Elbrashy

Abou-Taleb

El-Fakharany

et al. 2022

Environ Sci Pollut Res

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The investment of solar energy in life applications has become mandatory to maintain a clean environment and reduce the use of fossil fuels. This work aimed to improve the performance of solar air heater (SAH) by using evacuated tube solar collectors ETSC integrated with nano-enhancer phase change material (NE-PCM). To achieve this purpose, a system consisting of 5 linked collecting panels was designed, fabricated, and experimentally investigated. Each panel included a glass-evacuated tube with two concentric aluminum pipes installed inside. NE-PCM was placed between the inlet and outlet air paths inside the evacuated tube to enhance the heat transfer rate. The performance was investigated with and without NE-PCM at five mass flow rates (0.006, 0.008, 0.01, 0.03, and 0.05 kg/s). Experimental results revealed that the highest temperature was 116, 108, 102, 95, and 93 °C, respectively, for the above mass flow rates without adding NE-PCM. The outlet temperature was decreased by 6–15 °C when using NE-PCM. The SAH efficiency was increased by 29.62% compared to the system without NE-PCM at 0.05 kg/s. The maximum thermal efficiency for the system with NE-PCM was 62.66% at 0.05 kg/s, and the pressure drop was 6.79 kPa under the same conditions. As well known, the hot air is used for a variety of purposes including space heating, food processing, drying of fruit, vegetables, dairy, and solar cooking.

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Study on design and thermal characteristics of vacuum tube solar collector intubated with heat storage tube

Cited by 8 publications

References 10 publications

Simulation Experiment of Heat Transfer Tubes for Electronic Heat Absorber in Thermal Power Generation System of Power Plants

Simulation Experiment of Heat Transfer Tubes for Electronic Heat Absorber in Thermal Power Generation System of Power Plants

Energy and exergy analysis for stationary solar collectors using nanofluids: A review

Experimental study of solar air heater performance with evacuated tubes connected in series and involving nano-copper oxide/paraffin wax as thermal storage enhancer

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