Thermal performance enhancement of flat-plate and evacuated tube solar collectors using nanofluid: A review

Muhammad, Mahmud Jamil; Muhammad, Isa Adamu; Sidik, Nor Azwadi Che; Yazid, Muhammad Noor Afiq Witri Muhammad

doi:10.1016/j.icheatmasstransfer.2016.05.009

Cited by 107 publications

(20 citation statements)

References 140 publications

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“…The influence of Lorentz or the Darcian body force at the boundary is presented in Table (3). The Skin friction coefficient increases but the Nusselt number decreases with increasing strength of parameters M and K. Figure (11), (14) demonstrated that the entropy of the system increases with increase in the strength of applied transverse magnetic field and the permeability of the medium. ation within boundary layer for Maxwell nanofluids due to variation in nanoparticle volume concentration parameter ϕ.…”

Section: Entropy Generation Analysismentioning

confidence: 92%

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Mathematical model for thermal and entropy analysis of thermal solar collectors by using Maxwell nanofluids with slip conditions, thermal radiation and variable thermal conductivity

2018

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Abstract:In the present research a simplified mathematical model for the solar thermal collectors is considered in the form of non-uniform unsteady stretching surface. The non-Newtonian Maxwell nanofluid model is utilized for the working fluid along with slip and convective boundary conditions and comprehensive analysis of entropy generation in the system is also observed. The effect of thermal radiation and variable thermal conductivity are also included in the present model. The mathematical formulation is carried out through a boundary layer approach and the numerical computations are carried out for Cuwater and TiO 2 -water nanofluids. Results are presented for the velocity, temperature and entropy generation profiles, skin friction coefficient and Nusselt number. The discussion is concluded on the effect of various governing parameters on the motion, temperature variation, entropy generation, velocity gradient and the rate of heat transfer at the boundary.

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Section: Entropy Generation Analysismentioning

confidence: 92%

“…Finally the review article of Muhammad et. al [14] covered almost all the literature of past ten years on use of nanofluids and enhancement in thermal efficiency of solar collectors.…”

Section: Introductionmentioning

confidence: 99%

Mathematical model for thermal and entropy analysis of thermal solar collectors by using Maxwell nanofluids with slip conditions, thermal radiation and variable thermal conductivity

2018

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“…Good agreement with the conditions of increasing the flow proportions of heat transfer fluid they used. Nano-fluids (metal oxide) also used in research as mentioned by Muhammad et al was suggested in the thermal functioning of improved flatplate and evacuated solar collectors [21]. Thermal conductivity comprises a significant factor to ensure the use of nano-fluids as heat transfer materials for solar applications.…”

Section: Introductionmentioning

confidence: 99%

Energy and Exergy Analyses of PV Roof Solar Collector

Prommas¹,

Phiraphat²,

Rattanadecho³

2019

IJHT

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Analysis of the energy and exergy for a naturally ventilated roof called a PV roof solar collector (PV-RSC) was the main purpose of this study, which is comprised of a PV panel (120 W) formed on an upper layer and an aluminum plate on the lower layer of the channel with a length and width of 1.2 and 0.7 m, respectively. Measurements of 30 o and 15 cm were set for the gradient angle and air gap of the channel, respectively. The PV panel temperature and air flow temperature affected the efficacy of energy and exergy, as suggested by the results. The research showed effectiveness values of 35-67 % and 15-21 % for total energy and exergy, respectively. Because exergy is expended in the system to geneproportion entropy, exergy yield is reduced compared to the exergy contribution of the system. Further, a correlation exists between the determined and computed values for mass flow proportion through the PV-RSC. Besides, study for other various conditions (such as different weather, PV inclination angles, aspect ratios) is required which would be leading to draw more than general conclusion and spread into adaptation of the system to make higher performance while adjusting the appropriated factors. The aim of this study is to investigate a natural ventilated PV roof solar collector (PV-RSC) and analysis the energy and exergy of the system. A simulation model was comprised of a PV panel (120 W) formed on an upper layer and an aluminum plate on the lower layer of the channel with a length and width of 1.2 and 0.7 m, respectively. Measurements of 30 o and 15 cm were set for the varies gradient angle and air gap of the channel. The PV panel temperature and air flow temperature affected the efficacy of energy and exergy, as suggested by the results. The research showed effectiveness values of 35-67 % and 15-21 % for total energy and exergy, respectively. Because exergy is expended in the system to gene proportion entropy, exergy yield is reduced compared to the exergy contribution of the system. Further, a correlation exists between the determined and computed values for mass flow proportion through the PV-RSC. Besides, study for other various conditions (such as different weather, PV inclination angles, aspect ratios) is required which would be leading to draw more than general conclusion and spread into adaptation of the system to make higher performance while adjusting the appropriated factors.

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“…Güneş enerjisi özelinde, ülkemiz ve dünya genelinde sıcak su elde etme başta olmak üzere birçok şekilde günlük hayatta istifade yolları karşımıza çıkmaktadır [2]. Isınma dışında güneş enerjisinden doğrudan elektrik elde etmek için fotovoltoik gibi birçok alanda çalışmalar devam etmekte; var olanı daha verimli kullanma ve yenileri ise keşfedip ortaya çıkarma çabaları devam etmektedir [3]. Güneş enerji piyasası 1920'li yıllarda başlayıp 1950'li yıllara kadar gelişimini sürdürmüştür.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Heat Pipe Evacuated Tubular Solar Collector Performance Improvement by Applications Of Nanofluid

Sözen

Menlik³

2019

Politeknik Dergisi

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Güneş enerjili sistemler, günümüzde çok farklı alanlarda, farklı amaçlar için yaygın olarak kullanılmaktadır. Güneş enerjili sistemlerin en önemli elemanı güneş kollektörleridir. Güneş kollektörleri genel olarak düzlem yüzeyli (DYGK), vakum tüplü (VTGK), ısı borulu (IBGK) ve parabolik (PGK) olmak üzere dört tipe ayrılmakla beraber en yaygın olarak DYGK kullanılmaktadır. DYGK'nin verimini etkileyen parametreler; kollektörlerde kullanılan akışkanın ısıl iletkenliği, ısı kayıpları ve optik kayıplardır. DYGK'ların düşük verimlerinden dolayı son zamanlarda güneş enerjili sistemlerde VTGK ve IBGK'ların harmonizasyonu olan vakum tüplü ısı borulu güneş kollektörleri (VTIBGK) kullanılmaya başlanmıştır. VTIBGK'lar DYGK'lerin termik ve optik kayıplarını minimize etmekte ve verim artmaktadır. Bu çalışmada Güneş kollektörlerinde verimi etkileyen diğer bir parametre çalışma akışkanı olup literatürde örneğine pek rastlanmamış olunan amorf yapıdaki nano partiküller kullanılarak hazırlanmış nano akışkanların performansa etkisi irdelenmiştir. Son yıllarda yapılan çalışmalarda nanoakışkanları ısıl sistemlerde ve özellikle ısı borularında iyi sonuçlar verdiği ve verimlerini dikkate değer derecede arttırdığı görülmüştür. VTIBK'lerde nano çözelti kullanılması ile düşük ısıl direnç, yüksek ısıl iletkenlik, yüksek çalışma sıcaklıkları, kısa sürede istenen sıcaklık değerlerine ulaşılması ve verimin arttırılması hedeflenmektedir. Anahtar Kelimeler: Isı borusu, güneş kollektörleri, nano çözelti, nano akışkan, performans iyileştirmesi, güneş enerjisi.

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Thermal performance enhancement of flat-plate and evacuated tube solar collectors using nanofluid: A review

Cited by 107 publications

References 140 publications

Mathematical model for thermal and entropy analysis of thermal solar collectors by using Maxwell nanofluids with slip conditions, thermal radiation and variable thermal conductivity

Mathematical model for thermal and entropy analysis of thermal solar collectors by using Maxwell nanofluids with slip conditions, thermal radiation and variable thermal conductivity

Energy and Exergy Analyses of PV Roof Solar Collector

Heat Pipe Evacuated Tubular Solar Collector Performance Improvement by Applications Of Nanofluid

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