Energy and exergy analysis of photovoltaic–thermal collector with and without glass cover

Chow, Tommy W. S.; Pei, G.; Lin, Zhang; Chan, Alfred; Ji, J.

doi:10.1016/j.apenergy.2008.04.016

Cited by 485 publications

(126 citation statements)

References 19 publications

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“…The conversion efficiency of PV/T system depends on many factors which affect the overall system efficiency. The overall efficiency of the system is denoted by η pvt is equal to the sum of the electrical and thermal output divided by the total solar radiation incident on the PV panel per unit area [11,12]. The overall efficiency (η pvt ) of PVT system can be expressed as The PV/T system, the C f value between 0.35 and 0.40 is reported [14].…”

Section: Efficiency Calculation Of Pv/t Systemmentioning

confidence: 99%

Experimental investigations of hybrid PV/Spiral flow thermal collector system performance using Al₂O₃/water nanofluid

Gangadevi

Vinayagam

Senthilraja

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In this paper, the PV/T (Photovoltaic thermal unit) system is investigated experimentally to examine the thermal, electrical and overall efficiency by circulating Al 2 O 3 /water nanofluid of 1wt% and 2wt% with an optimum flow rate of 40L/H. The overall efficiency of PVT system is largely influenced by various factors such as heat due to photovoltaic action; energy radiated at the infrared wavelength of the solar spectrum, solar irradiance, mounting structure, tilt angle, wind speed direction, Ambient temperature and panel material composition. However, the major factor is considered in this study to extract the heat generated in the PV panel by using nanofluid as a coolant to increase the overall system efficiency. Therefore, the result shows that by using 2 wt% Al 2 O 3 /water nanofluid the electrical efficiency, thermal efficiency and overall efficiency of the PVT system enhanced by 13%, 45%, and 58% respectively compared with water. Keywords: PVT system, electrical efficiency, thermal efficiency, Al 2 O 3 /water nanofluid, IntroductionHybrid PVT System absorbs the direct solar radiation and converts into electrical and thermal energy. In this system solar cell, converts sunlight into electrical energy i.e electricity, and the thermal collector captures the remaining energy and removes heat generated by the PV panel. Matin Ghadidri et al., [1] investigated the performance of PVT system using ferrofluid as a heat transfer medium. They reported that the overall system efficiency is about 76% by using ferrofluid of 3wt% as a cooling medium. Michael et al., [2] analyzed that the copper sheet laminated PV/T system using 0.05 % copper oxide -water nanofluid .the result revealed that the thermal efficiency of 45.76%. Mohammad Sardarabadi et al., [3] investigated experimentally the effect of Silica/water on PV/T system. The result revealed that the thermal efficiency of 7.6% and 12.8% in case of 1wt% and 3wt% and the total exergy efficiency is about 24.31% at 3 wt% of Silica-water nanofluid respectively. YingYing Wu et al.,[4] studied the performance of photo electric hybrid system. The result showed that the unglazed PVT gives higher system performance by using nanofluid compared with water. Wei He et al., [5] studied the performance of a thermoelectric cooling and heating system in summer and winter operation modes. The result revealed that the COP of the system reaches 1.7 and the electrical and thermal efficiency increases into 16.7% and 23.5% respectively. Khelifa et al., [6] analyzed the hybrid PV/T system using Computational Fluid Dynamics (CFD). Adnan Ibrahim et al.,

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Section: Efficiency Calculation Of Pv/t Systemmentioning

confidence: 99%

Experimental investigations of hybrid PV/Spiral flow thermal collector system performance using Al₂O₃/water nanofluid

Gangadevi

Vinayagam

Senthilraja

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The sheet and tube PV/T system used in the present study composed of a PV module, a thermal absorber, glazing, working fluid, tube, and insulation (Figure 2). System modeling is based on the energy balance equations developed by Chow [28]. The following assumptions are considered in the model development:…”

Section: Pv/t Module Modelingmentioning

confidence: 99%

“…Therefore, techniques such as Dynamic Matrix Programming, PID, Model Predictive Control and Fault Tolerant were applied [23]- [26]. Additionally, Fuzzy Logic Controller (FLC) is used extensively in industrial applications due to its simplicity as a process to control system, and its low cost [27] [28]. Fuzzy logic controller (FLC) presents a rule-based controller where the control action depends on a defined set of rules, and on the considered input variables.…”

Section: Introductionmentioning

confidence: 99%

Improvement of PV/T Based Reverse Osmosis Desalination Plant Performances Using Fuzzy Logic Controller

Ammous¹,

Charfi²,

Harb³

et al. 2016

IJMNTA

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Photovoltaic based reverse osmosis desalination systems (PV/RO) present an effective method of water desalination especially in remote areas. The increase of the feed water temperature leads to an amelioration of the plant performances. Photovoltaic Thermal Collector (PV/T) represents an ideal power source as it provides both electric and thermal energies for the reverse osmosis process. Nevertheless, PV/T based RO plants should be controlled in order to solve operation problems related to electrical efficiency, reverse osmosis membrane, produced water and the rejected salts. This paper suggests a fuzzy logic controller for the flow rate of the circulating fluid into the PV/T collectors so as to ameliorate the system performances. The designed controller has improved the PV/T field electrical efficiency and preserved the reverse osmosis membrane which upgrades the system productivity. LABVIEW software is used to simulate the controlled system and validate the effectiveness of the controller.

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“…where the exergy obtained in the storage tank may be written as follows [20], and x output E may be calculated by:…”

Section: Second Law Efficiency Of the Systemmentioning

confidence: 99%

Comparative Experimental Analysis of the Thermal Performance of Evacuated Tube Solar Water Heater Systems With and Without a Mini-Compound Parabolic Concentrating (CPC) Reflector(C < 1)

Pei

Zhou

et al. 2012

Energies

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Evacuated tube solar water heater systems are widely used in China due to their high thermal efficiency, simple construction requirements, and low manufacturing costs. CPC evacuated tube solar water heaters with a geometrical concentration ratio C of less than one are rare. A comparison of the experimental rig of evacuated tube solar water heater systems with and without a mini-CPC reflector was set up, with a series of experiments done in Hefei (31°53'N, 117°15'E), China. The first and second laws of thermodynamics were used to analyze and contrast their thermal performance. The water in the tank was heated from 26.9 to 55, 65, 75, 85, and 95 °C. Two types of solar water heater systems were used, and the data gathered for two days were compared. The results show that when attaining low temperature water, the evacuated tube solar water heater system without a mini-CPC reflector has higher thermal and exergy efficiencies than the system with a mini-CPC reflector, including the average and immediate values. On the other hand, when attaining high temperature water, the system with a mini-CPC reflector has higher thermal and exergy efficiencies than the other one. The comparison presents the advantages of evacuated tube solar water heater systems with and without a mini-CPC OPEN ACCESSEnergies 2012, 5 912 reflector, which can be offered as a reference when choosing which solar water system to use for actual applications.

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Energy and exergy analysis of photovoltaic–thermal collector with and without glass cover

Cited by 485 publications

References 19 publications

Experimental investigations of hybrid PV/Spiral flow thermal collector system performance using Al₂O₃/water nanofluid

Experimental investigations of hybrid PV/Spiral flow thermal collector system performance using Al₂O₃/water nanofluid

Improvement of PV/T Based Reverse Osmosis Desalination Plant Performances Using Fuzzy Logic Controller

Comparative Experimental Analysis of the Thermal Performance of Evacuated Tube Solar Water Heater Systems With and Without a Mini-Compound Parabolic Concentrating (CPC) Reflector(C < 1)

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Energy and exergy analysis of photovoltaic–thermal collector with and without glass cover

Cited by 485 publications

References 19 publications

Experimental investigations of hybrid PV/Spiral flow thermal collector system performance using Al2O3/water nanofluid

Experimental investigations of hybrid PV/Spiral flow thermal collector system performance using Al2O3/water nanofluid

Improvement of PV/T Based Reverse Osmosis Desalination Plant Performances Using Fuzzy Logic Controller

Comparative Experimental Analysis of the Thermal Performance of Evacuated Tube Solar Water Heater Systems With and Without a Mini-Compound Parabolic Concentrating (CPC) Reflector(C < 1)

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Experimental investigations of hybrid PV/Spiral flow thermal collector system performance using Al₂O₃/water nanofluid

Experimental investigations of hybrid PV/Spiral flow thermal collector system performance using Al₂O₃/water nanofluid