Experimental optimization on the volume-filling ratio of a loop thermosyphon photovoltaic/thermal system

Zhang, Tao; Yan, Zhiwei; Pei, Gang; Zhu, Qunzhi; Ji, Jie

doi:10.1016/j.renene.2019.05.014

Cited by 38 publications

(6 citation statements)

References 35 publications

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“…Though published studies about the application of loop thermosyphon pipes in the PV/T system are not too much, the existing literature can still inspire this research. Zhang et al experimentally discussed the volume-filling ratio of isobutene (R600a) as working fluid in a traditional loop thermosiphon PV/T system with the heat flux and inclination and concluded that the optimum figure lay in between 32% and 40% for this structure [12]. Yu et al [7] proposed a novel microchannel loop heat pipe PV/T which used several microchannel heat pipes as evaporators and used a novel triple PCM heat exchanger as condenser.…”

Section: Fig 2 the Layout Of The Novel Lt-pv/tmentioning

confidence: 99%

“…In addition, research about LT's characteristics and its' application in solar water heating systems or heat pump systems are of reference significance for this research. The heat transfer performance of loop thermosyphon is greatly affected by volume-filling ratio [15], tilt angle [12], heat flux [16], physical properties of the working fluid, geometrical and operational conditions [17] etc. Liu et al [15] experimentally investigated the heat transfer in LHP with volume-filling ratios ranging from 38% to 87% overheat flux from 35 to 395 W/cm −2 .…”

Section: Fig 2 the Layout Of The Novel Lt-pv/tmentioning

confidence: 99%

“…1. Traditional LT condenser in water tank [12] The condensing section of the loop thermosyphon pipes in PV/T, solar collector or solar-assisted heat pump system [13] is usually spiralled and immersed in a water tank [9], things like Fig. 1.…”

mentioning

confidence: 99%

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Experimental investigation and annual performance mathematical-prediction on a novel LT-PV/T system using spiral-descent concentric copper tube heat exchanger as the condenser for large-scale application

et al. 2022

Renewable Energy

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Section: Fig 2 the Layout Of The Novel Lt-pv/tmentioning

confidence: 99%

Section: Fig 2 the Layout Of The Novel Lt-pv/tmentioning

confidence: 99%

See 1 more Smart Citation

Experimental investigation and annual performance mathematical-prediction on a novel LT-PV/T system using spiral-descent concentric copper tube heat exchanger as the condenser for large-scale application

et al. 2022

Renewable Energy

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“…For the loop heat pipe PV/T system, it can transfer heat to the coolant through natural convection or forced convection heat exchange mode, and the refrigerant inside of the tube can be water, R134a, R600a, etc. Zhang et al [77] investigated the effect of the volume-filling rate of refrigerant on the performance of the loop heat pipe PV/T system with natural convection cooling mode. It was found that the highest performance was generated under the 32% filling condition (Fig.…”

Section: Loop Heat Pipe Pv/t (Lhp-pv/t) Systemmentioning

confidence: 99%

“…The testing Fig. 10 Schematic diagram of LHP-PV/T system [77] Fig. 11 Schematic of the micro-channel LHP-PV/T system [81] results showed that the electrical efficiency ranges from 15.59% to 18.34%, and thermal efficiency varies from 25.2% to 62.2%.…”

Section: Loop Heat Pipe Pv/t (Lhp-pv/t) Systemmentioning

confidence: 99%

A Review on the Heat Pipe Photovoltaic/Thermal (PV/T) System

Zhou

Zhong

et al. 2021

J. Therm. Sci.

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The Photovoltaic/thermal (PV/T) system combines the conventional PV panel with solar collector into one integrated system, which could achieve the function of generating power and providing thermal energy at the same time. Recently, it has become the most promising solar system for building applications. Most of the PV/T systems use water as the coolant, which could cause freezing problem in winter. To overcome this problem, the heat pipe PV/T system is developed to provide electrical and thermal energy stably without the seasonal barrier.Although some published review works have involved this type of PV/T system, they just stated a simple introduction on it, acting as a small part of their works. This paper focuses on the heat pipe PV/T system independently and provides a comprehensive and in-depth analysis of its performance. Firstly, the structure and operational principles of the heat pipe PV/T module and system are introduced concisely. Then the features and performance of different types of heat pipe PV/T systems, i.e., integral heat pipe, loop heat pipe, and pulsating heat pipe PV/T system, are presented and analyzed. This is followed by the review on the performance of the systems which combine heat pipe PV/T module and other devices. Finally, the research gaps in this field are identified, and some future research trends and directions are recommended.

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Improve the performance of renewable energy conversion and storage via ANN in a system of solar water heater with variable speed photovoltaic circulating pump

Asiri

Salilih

Alfawaz

et al. 2022

Intl J of Energy Research

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Summary A solar heater with a variable speed circulation pump is analyzed based on the manufacturer's data sheet of the PV generator, the DC pump as well as the solar collector under a specific climate condition via ANN approach. Direct normal irradiance, global horizontal irradiance and ambient temperature data of Tabuk city were used for system analysis. The detailed electrical characteristics of PV generator are performed based on a single diode model and transient thermal modeling of the storage tank is performed based on the Crank‐Nicolson numerical method which is developed based on thermodynamic energy balance. Hourly electrical performance output of PV generator is predicted considering maximum power point as MPPT is part of the PV pumping system which optimizes the power output of from the PV module. An empirical curve fitting correlation that determines the performance of the DC pump is developed from the performance curve of the pump which is obtained from the pump manufacturer. Similarly, an empirical correlation that relates flow rate and head loss at the solar collector is developed from the solar collector's manufacturer data sheet. Hydraulic features of the system such as hourly flow output and hourly head loss at the collector are determined based on a developed algorithm. Furthermore, hourly thermal characteristics are determined based on the Crank‐Nicolson technique. The power of solar cells was highly dependent on voltage and radiation intensity. To evaluate the sensitivity of the PV arrays, an artificial neural network (ANN) was used and it was found that the ANN with an R2 of .9998 had an error of less than 5% for more than 97% of the data points.

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Experimental optimization on the volume-filling ratio of a loop thermosyphon photovoltaic/thermal system

Cited by 38 publications

References 35 publications

Experimental investigation and annual performance mathematical-prediction on a novel LT-PV/T system using spiral-descent concentric copper tube heat exchanger as the condenser for large-scale application

Experimental investigation and annual performance mathematical-prediction on a novel LT-PV/T system using spiral-descent concentric copper tube heat exchanger as the condenser for large-scale application

A Review on the Heat Pipe Photovoltaic/Thermal (PV/T) System

Improve the performance of renewable energy conversion and storage via ANN in a system of solar water heater with variable speed photovoltaic circulating pump

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