Development of a composite PVT panel with PCM embodiment, TEG modules, flat-plate solar collector, and thermally pulsing heat pipes

Kılkış, Birol

doi:10.1016/j.solener.2019.10.075

Cited by 43 publications

(17 citation statements)

References 22 publications

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“…The original equations were derived in this research by the Author (Except Eq. 1, which represents the very well-known 1st Law efficiency), based on our references [11,12,14,16,21] and presented above, were used to determine the relationship between the operating (supply) temperatures in the built environment and the CO 2 emissions, including the embodied emissions in district energy systems, which are gaining popularity for achieving the targets of decarbonization with total electrification. Exergy destructions play an important role in total ƩCO 2 emissions, which includes the nearly-avoidable emissions, CO 2 , as a result of exergy destructions.…”

Section: Resultsmentioning

confidence: 99%

“…Low-temperature renewable and waste heat sources, for example, have low ε sup . For solar energy insolation level of 750 W/m 2 impingent on a solar panel surface, ε sup is 0.52 kW/kW [11]. For a fossil fuel like natural gas, ε sup is 0.87 kW/kW.…”

Section: Resultsmentioning

confidence: 99%

“…The 2 nd Law defines an exergy-based COP, which includes the absolute values of the relevant temperatures [11,14]. Fig.…”

Section: Figure 11 Diminishing Returns Of N For Increasing Copmentioning

confidence: 99%

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Is exergy destruction minimization the same thing as energy efficiency maximization?

Kılkış

2021

Journal of Energy Systems

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This paper discusses whether the exergy destruction minimization or energy efficiency maximization comes first in resolving the climate emergency problem and provides sustainable solution options regarding the 2 nd Law of thermodynamics. It has been shown that low-temperature district energy systems with renewable energy sources and waste heat are effective in minimizing exergy destructions, while energy efficiency has a secondary impact. The research has been based on the Rational Exergy Management Model. The corresponding rational exergy management efficiency was directly related to nearly-avoidable CO2 emissions responsibility with a global magnitude of around 80% of direct emissions in the built environment. One conclusion deduced from such an unrecognized magnitude so far is that nearly-avoidable CO2 emissions may not be ignored anymore to develop new strategies for sustainable decarbonization, while the 1 st Law measures have limited remaining capabilities. New equations were developed to show the impact of exergy destructions on total CO2 emissions. Sample results show that a 30 percent-point decrease of exergy destructions comparing to the supplied exergy in thermo-mechanical systems has the potential of reducing total CO2 emissions by 35%. The paper argues that current exergy destruction is around 0.8 of the supply exergy, as an industry average, which gives ample room for improvement using the 2 nd Law, while the 1 st Law efficiency is already higher, and there is less room available for improvements concerning CO2 emissions. The paper shows that the 1 st Law efficiency may be increased by about 0.15 points, which gives a window of opportunity about a 25 percent-point decrease in emissions. The second main conclusion is that nowadays, new decarbonization strategies are needed based on the 2 nd Law, which will positively impact when coupled with the current 1 st Law measures towards meeting the Paris agreement.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Is exergy destruction minimization the same thing as energy efficiency maximization?

Kılkış

2021

Journal of Energy Systems

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“…The use nanofluid as coolant helps to increase the efficiency by 0.28% and 0.48% for unglazed and glazed PV panel respectively. Kilkis [9] proposed a multi-layered composite PVT module which consists of several small PVT cartridges, each fitted with PV cells, TEG modules, PCM layer, and a flat plate solar collector. Pilot scale tests have shown that the total power generation efficiency of this system is improved by up to 30% with the TEG.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Photovoltaic Passive Heat Storage System with Microencapsulated Paraffin Wax for Thermoelectric Generation

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Rostam

Noum

et al. 2021

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The depletion of non-renewable energy sources and negative effects towards the environment push research towards the widespread adoption of renewable energy sources such as solar energy. The main drawback of solar panels is that temperatures above 27°C will result in an efficiency drop of 0.1-0.5%/°C. In previous studies, usage of photovoltaic thermal (PVT) systems was mainly for the purpose of heating water, warming buildings, and drying crops. This research will focus on the usage of a standalone PVT and thermoelectric generator (TEG) system whereby it uses heat extracted from the PVT system for thermoelectric generation. A passive standalone PVT-TEG system design with microencapsulated paraffin wax as a phase change material (PCM) as a heat storage medium was created. The heat stored in the PCM is used as a heat source for thermoelectric generation. To extract the heat from the PV panel, an aluminum heatsink underneath the PV panel is used as a heat absorber to passively extract heat without external power sources. This setup reduces the surface temperature by 22.7°C. Transient thermal analysis and thermoelectric simulation of the system was conducted through Computational Fluid Dynamics (CFD) using ANSYS 2019 software. The error recorded between the experimental and simulation results was 4.2%. This proposed system panel successfully increased the electrical efficiency of the PV panel by approximately 12.8%, where the overall electrical power produced shows a significant increase from 7.7W to 17.7W.

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“…PVT panellerde ise bu değer 0,8'e kadar çıksa da ne yapılırsa yapılsın, önlenebilir CO 2 değeri sıfıra ulaşmaz [25]. İstanbul gibi kentlerde toprak kaynaklı ısı pompalarının ısı değiştirici ve mevsimlik ısı depolama hacimlerine yer kalmamıştır.…”

Section: Introductionunclassified

Yapılardaki Kat Adedinin Büyük Kentlerin Güneş Enerjisinden Akılcı Yararlanmasına Etkileri

Kılkış

2020

Mühendis Ve Makina

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Bu çalışmada, yoğun ve dikey kentleşme özelinde güneş enerjisinden akılcı yararlanma yöntemlerinin sürdürülebilir çözümleri araştırılmıştır. Bu bağlamda, çok yüksek katlı, cam giydirmeli bina cephelerindeki alüminyum malzemenin ve saydam PV gözelerinin gömülü enerji ve ekserjilerinin, bunlara bağlı olarak da gömülü CO2 salımlarının fazlalığı ve diğer fiziksel kısıtlar nedeni ile güneş enerjisinden akılcı ve çevreci biçimde etkin yararlanılmasının mümkün olmadığı görülmüştür. Güneş enerjisinden yararlanmada yüksek binaların komşu binaları gölgeleme etkisinin de yasal sorunları olabileceği üzerinde durulmuştur. Makalede, yapılı çevrede güneş enerjisinin etkin kullanımında en akılcı çözümün bireysel binalar yerine bölge enerji sistemlerinin geliştirilip yaygınlaştırılması olduğu öne sürülmekte, somut örnekler verilerek sadece güneş değil, rüzgâr, jeotermal ve biyogaz gibi yenilenebilir enerji sistemlerinin melez kullanımının önemine işaret edilerek CO 2 salımlarını azaltma amaçlı yeni bir şehir planlama modeline olan gereksinim belirtilmektedir. Yatay ve yaygın kentleşmenin alt yapı ve ulaşıma ilişkin ek yatırım ve işletim giderleri ile buna bağlı ek CO 2 salımlarının da göz önünde tutulduğu bir enuygun çözüm algoritması tanıtılmaktadır. Örnek çalışmalarla yüksek binalar yerine yaygın kentleşmeye özen gösterilmesine dikkat çekilmektedir. Enuygun Kentleşme Modeli adı verilen bu algoritmanın anlatımı yanı sıra yenilikçi bir örnek olarak tasarlanan güneş ve rüzgâr enerjili hidrojen evi tanıtılmaktadır.

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Development of a composite PVT panel with PCM embodiment, TEG modules, flat-plate solar collector, and thermally pulsing heat pipes

Cited by 43 publications

References 22 publications

Is exergy destruction minimization the same thing as energy efficiency maximization?

Is exergy destruction minimization the same thing as energy efficiency maximization?

Performance Analysis of Photovoltaic Passive Heat Storage System with Microencapsulated Paraffin Wax for Thermoelectric Generation

Yapılardaki Kat Adedinin Büyük Kentlerin Güneş Enerjisinden Akılcı Yararlanmasına Etkileri

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