A sensitivity study of a hybrid photovoltaic/thermal water-heating system with natural circulation

Ji, Jie; Lü, Jianping; Chow, Tommy W. S.; He, Wei; Pei, Gang

doi:10.1016/j.apenergy.2006.04.009

Cited by 255 publications

(79 citation statements)

References 15 publications

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“…At the City University of Hong Kong, Chow [95,233] built a dynamical model for a PVT collector, which was used to calculate the performance of a thermosyphon system. At the University of Science and Technology of China, in cooperation with Chow, Ji et al [234,215,96] carried out a sensitivity study for this system and He et al [97] describe experimental results. In India, the focus was on stand-alone thermosyphon applications for PVT, that were largely carried out at the Centre of Energy Studies of the Indian Institute of Technology in New Delhi and at the University of Delhi [98][99][100]230,235,129].…”

Section: History Of Pvt Water Heatingmentioning

confidence: 99%

Flat-plate PV-Thermal collectors and systems: A review

Zondag

2008

Renewable and Sustainable Energy Reviews

555

220

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Section: History Of Pvt Water Heatingmentioning

confidence: 99%

Flat-plate PV-Thermal collectors and systems: A review

Zondag

2008

Renewable and Sustainable Energy Reviews

555

220

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“… The ohmic losses in the solar cell are negligible [24]. The term total efficiency η o has been widely used in the performance evaluation of PV/T system [4,27,28], i.e. η 0 = η e + η t (1) Where η t and η e are, respectively, the thermal efficiency and electrical-power generation efficiency of the PV/T system.…”

Section: Energy Balance Equationsmentioning

confidence: 99%

“…PV/T modules have the ability to generate more energy per unit surface area than side by side PV panels and solar thermal collectors, at a lower production and installation cost. Because of its high efficiency per unit surface area, PV/T is particularly well suited for applications with both heat and power demand [4,5]. In the Netherlands it is showed by ECN (Energy Research Centre of the Netherlands) that with the use of PV/T collectors it was possible to reduce the total collector area by 40% while generating the same amount of energy [6].…”

Section: Introductionmentioning

confidence: 99%

Experimental Performance Investigation of Photovoltaic/Thermal (PV–T) System

Özgören

Aksoy

Bakir³

et al. 2013

EPJ Web of Conferences

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Abstract. Photovoltaic solar cells convert light energy from the sun into electricity. Photovoltaic cells are produced by semi-conducting materials to convert the energy into electricity and during this process heat is absorbed by the solar radiation. This heat causes a loss of electricity generation efficiencies. In this study, an experimental setup was designed and established to test two separate photovoltaic panel systems with alone PV and with water cooling system PV/T to examine the heat effect on PV systems. The absorbed heat energy behind the photovoltaic cell's surface in insulated ambient was removed by means of a water cooling system and the tests for both systems were simultaneously performed along the July 2011. It is found that without active water cooling, the temperature of the PV module was higher during day time and solar cells could only achieve around 8% conversion efficiency. On the other hand, when the PV module was operated with active water cooling condition, the temperature dropped significantly, leading to an increase in the efficiency of solar cells as much as 13.6%. Gained from absorbed solar heat and maximum thermal conversion efficiencies of the system are determined as 49% and 51% for two different mass flow rates. It is observed that water flow rate is effective on the increasing the conversion efficiency as well as absorption and transition rates of cover glass in PV/T (PV-Thermal) collector, the insulation material and cell efficiency. As a conclusion, the conversion efficiency of the PV system with water cooling might be improved on average about 10%. Therefore, it is recommended that PV system should be designed with most efficient type cooling system to enhance the efficiency and to decrease the payback period.

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“…Bilbao and Sproul [12] conducted an experimental study on PV/T water cooling system with an improvement the 5% efficiency of the system. Ji et al [13] presented a sensitivity analysis of a hybrid PV/T water heating system with natural circulation. Their results showed saving of around 65% of primary energy on the daily basis with a PV cell covering factor of 0.63.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Photovoltaic Panels with Earth Water Heat Exchanger Cooling

Jakhar

Soni

Gakkhar

2016

MATEC Web of Conferences

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Abstract. The operating temperature is an important factor affecting the performance and life span of the Photovoltaic (PV) panels. The rising temperature can be maintained within certain limit using proper cooling techniques. In the present research a novel system for cooling of PV panels named as Earth Water Heat Exchanger (EWHE) is proposed and modelled in transient analysis simulation tool (TRNSYS v17.0) for the conditions of Pilani, Rajasthan (India).The various parameters which include cell temperature, PV power output and cell efficiency are observed with respect to variation in mass flow rate of fluid. Simulation results of the system without cooling show that the maximum PV panel temperature reached up to 79.31 °C with electrical efficiency dropped to 9% during peak sunshine hour. On the other hand, when PV panels are coupled with EWHE system, the panel temperature drops to 46.29 °C with an efficiency improving to 11% for a mass flow rate of 0.022 kg/s. In the end the cooling potential of EWHE is found to be in direct correlation with mass flow rate. The proposed system is very useful for the arid regions of western India which are blessed with high solar insolation throughout the year.

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A sensitivity study of a hybrid photovoltaic/thermal water-heating system with natural circulation

Cited by 255 publications

References 15 publications

Flat-plate PV-Thermal collectors and systems: A review

Flat-plate PV-Thermal collectors and systems: A review

Experimental Performance Investigation of Photovoltaic/Thermal (PV–T) System

Performance Analysis of Photovoltaic Panels with Earth Water Heat Exchanger Cooling

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