scholarly journals Energy and exergy analyses of PV, solar thermal and photovoltaic/thermal systems: a comparison study

2020 ◽  
Author(s):  
Jiang Qingyang ◽  
Yang Jichun ◽  
Zeng Yanying ◽  
Fu Huide
Keyword(s):  
Solar Thermal ◽  
Input Output ◽  
Pv System ◽  
Thermal Systems ◽  
Solar Systems ◽  
Space Reduction ◽  
Energy And Exergy ◽  
Semi Empirical ◽  
Exergy Performance ◽  
T System

ABSTRACT Compared with photovoltaic (PV) or solar thermal (ST) system alone, the hybrid photovoltaic/thermal (PV/T) system has many advantages such as simultaneous production of electrical and thermal energies, efficient utilization on solar energy, space reduction and so on. However, there is limited data on both the energy and exergy performance comparisons of these three solar systems, especially for annual performance data. This paper aims to present a comparative study on the performances of the PV, ST and PV/T systems by a series of full-day experiments. Energy and exergy performances of these three solar utilization systems were all calculated and analyzed. Moreover, two typical evaluation methods, i.e. semi-empirical system efficiency model method and input–output method, were also used for evaluating the performances of these systems. Finally, based on the input–output method, the annual performances of the PV, ST and PV/T systems under typical meteorological conditions of Hong Kong region were predicted. The results show that the ST system has the highest total energy gain and energy efficiency and the PV system has the highest total exergy gain and exergy efficiency of these three systems. However, by a comprehensive consideration on the energy and exergy performances, the PV/T system has the best overall performance of these three solar systems.

scholarly journals Potential for Building Façade-Integrated Solar Thermal Collectors in a Highly Urbanized Context

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5801 ◽  
Author(s):  
Andrea Frattolillo ◽  
Laura Canale ◽  
Giorgio Ficco ◽  
Costantino C. Mastino ◽  
Marco Dell’Isola
Keyword(s):  
Primary Energy ◽  
Building Envelope ◽  
Solar Thermal ◽  
Thermal Systems ◽  
The Real ◽  
Solar Systems ◽  
Energy Needs ◽  
Solar Thermal Collectors ◽  
The Mediterranean

Development of technologies, materials, support systems, and coatings has made the integration of solar thermal systems into the building envelope increasingly possible. Solar thermal collectors can either be directly integrated, substituting conventional roof or façade covering materials, or constitute independent devices added to a roof or façade structure. Aimed at estimating the real effectiveness of building-integrated solar systems for domestic heat water (DHW) production or for heating integration, when horizontal or inclined pitches on buildings are not applicable, the authors analyze a case study with different scenarios, taking into account the issues connected to a highly urbanized context in the Mediterranean climate. A GIS model was used for estimating the energy balance, while the real producibility of the simulated systems was calculated by a dynamic hourly simulation model, realized according to ISO 52016. The savings in terms of primary energy needs obtained by installing solar thermal systems on the facade are presented, and the differences between the cases in which the system is used for DHW production only and for space heating too are distinguished and discussed. The evaluated potential is quantified in the absence of roof collectors, despite their high potential in the Mediterranean region, in order to better appreciate the effects induced by integrated facade systems.

A critical analysis on the energy and exergy performance of photovoltaic/thermal (PV/T) system: The role of nanofluids stability and synthesizing method

2022 ◽  
Vol 51 ◽  
pp. 101887
Author(s):  
Seyed Masoud Parsa ◽  
Alireza Yazdani ◽  
Hossein Aberoumand ◽  
Yousef Farhadi ◽  
Abolfazl Ansari ◽  
...  
Keyword(s):  
Critical Analysis ◽  
Energy And Exergy ◽  
Exergy Performance ◽  
T System

scholarly journals Reviewing the Exergy Analysis of Solar Thermal Systems Integrated with Phase Change Materials

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 724
Author(s):  
Macmanus Chinenye Ndukwu ◽  
Lyes Bennamoun ◽  
Merlin Simo-Tagne
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Second Law Of Thermodynamics ◽  
Heat Transfer Fluid ◽  
Solar Still ◽  
Thermal Systems ◽  
Solar Systems ◽  
Exergy Balance ◽  
Change Material

The application of thermal storage materials in solar systems involves materials that utilize sensible heat energy, thermo-chemical reactions or phase change materials, such as hydrated salts, fatty acids paraffin and non-paraffin like glycerol. This article reviews the various exergy approaches that were applied for several solar systems including hybrid solar water heating, solar still, solar space heating, solar dryers/heaters and solar cooking systems. In fact, exergy balance was applied for the different components of the studied system with a particular attention given to the determination of the exergy efficiency and the calculation of the exergy during charging and discharging periods. The influence of the system configuration and heat transfer fluid was also emphasized. This review shows that not always the second law of thermodynamics was applied appropriately during modeling, such as how to consider heat charging and discharging periods of the tested phase change material. Accordingly, the possibility of providing with inappropriate or not complete results, was pointed.

Environmental assessment of solar thermal systems for the industrial sector

2018 ◽  
Vol 176 ◽  
pp. 99-109 ◽  
Author(s):  
Angeliki Kylili ◽  
Paris A. Fokaides ◽  
Andreas Ioannides ◽  
Soteris Kalogirou
Keyword(s):  
Environmental Assessment ◽  
Industrial Sector ◽  
Solar Thermal ◽  
Thermal Systems

Fault Analysis of Solar Thermal Systems in Bhutan

2021 ◽  
pp. 60-71
Author(s):  
Tshewang Darjay ◽  
Cheku Dorji ◽  
Tshewang Lhendup ◽  
Martin Elborg
Keyword(s):  
User Behavior ◽  
Policy Instrument ◽  
Fault Analysis ◽  
Solar Thermal ◽  
Second Phase ◽  
Thermal Systems ◽  
Field Surveys ◽  
Government Sector ◽  
Solar Thermal Applications ◽  
Secondary Information

The Royal Government of Bhutan has accorded the highest priority towards diversifying the energy-mix through the promotion of renewable energy technologies. There is a national target to generate 3 MW equivalent of energy from the installation of solar thermal systems alone. However, little investment and priority are given for development of solar thermal applications. Some of the present existing solar water heating (SWH) systems are exhibiting faults which leads to low consumer confidence in SWH technology due to the non-functioning of previous installations which is very detrimental in this introductory stage. This study aims to identify problems of existing SWH systems through field surveys and develop a draft guideline to avoid faults in the future. To analyse the problems with existing SWH systems in Bhutan, the first phase of the study consists of collecting secondary information and opinion from the relevant government sector, local installing companies and end-users. The information on the manufacturer’s products, policy barriers, markets and consumer challenges is also collected. Base on this information, findings on the limitation of existing policy instrument and gap in demand and supply side is described. The second phase of the study comprises field visits to existing SWH system sites. The field surveys of twelve representative existing SWH systems are analyzed. Out of twelve sites, eight SWH systems had critical faults which causes major failure of the system and the other four sites had minor faults. To analyse the faults of existing SWH systems, faults are classified into design faults, plumbing circuit faults, solar collector faults, absorber faults, installation faults and user behavior faults. The major faults which lead to the failure of the existing SWH system are plumbing failure, condensation inside the collector and absorber tube leakage. The causes and solutions of the faults are discussed.

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