Thermal efficiency of single-pass solar air collector

Ibrahim, Zamry; Ibarahim, Zahari; Yatim, Baharudin; Ruslan, Mohd Hafidz

doi:10.1063/1.4858635

Cited by 5 publications

(8 citation statements)

References 9 publications

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“…Solar air heaters function by transmitting solar energy through cover sheets to heat absorber plates which in turn increases the internal energy of the air above it and inside the collector for space heating which can be applied for crop drying. Thus, solar air heaters increase the internal energy of the transporting medium (in this case, air) (Ibrahim, Ibrahim, Yatim, & Ruslan, 2013).…”

Section: Working Principle Of Low-thermal Solar Air Heatermentioning

confidence: 99%

Thermal Performance of Flat Plate Solar Collectors for Humid and Unpredicted Weather using Air Properties and Energy Method

Uba

Essandoh

Akolgo

et al. 2021

IJTMR

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Devising technologies to make use of renewable energy such as solar energy is very innovative and progressive sincetapping energy from a free source is cost effective in the long-term and totally ecologically friendly. The main aim ofsolar drying of crops is to preserve them by removing the excess moisture that will cause their deterioration in orderto improve their shelf life. Solar drying though found to be a mature, cost-effective and an efficient method ofdrying especially crops, it has not been widely deployed for crop drying both at the commercial and industrial levelin Ghana. The purpose of this research is to produce a solar heat collector for space heating using cheap andavailable materials and also to demonstrate the importance of incorporating obstacle/fins on plates to improve theefficiency of solar collectors. This study investigates the effect of increased air contact area of various configurationon the efficiency of solar air heaters. Nine different absorber plates (with and without fins) were considered by thisresearch in an experimental study to select the best design that will be suitable for absorbing or providing a highfraction of heat for conditioning humid atmospheric air (lowest relative humidity of the collector air). The bestdesigns of this study had an efficiency between 58% to 72% and maximum absorber temperatures above 80oC,collector air temperature above 70oC and collector air relative humidity below 20% while the worst design had anefficiency between 35% and 50%, collector air temperature bellow 45oC and the lowest collector air relativehumidity of 26%. The findings of this research have revealed that increasing the contact area of the air current orcirculation and the shapes of the fins attached to flat absorber plates increase their air contact areas and affect thethermal efficiency of the solar collectors. Also, it has revealed that the arrangement of fins contributes positively tothe efficiency of solar collectors. Citation: Felix Uba, Eric Osei Essandoh, Gilbert Ayine Okolo, Charles Nunya Dzikunu. Thermal Performance of Flat PlateSolar Collectors for Humid and Unpredicted Weather using Air Properties and Energy Method, 2020; 5(4): 30-49. Received: September 17, 2020Accepted: December 31, 2020

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Section: Working Principle Of Low-thermal Solar Air Heatermentioning

confidence: 99%

Thermal Performance of Flat Plate Solar Collectors for Humid and Unpredicted Weather using Air Properties and Energy Method

Uba

Essandoh

Akolgo

et al. 2021

IJTMR

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Section: F I G U R Ementioning

confidence: 99%

“…Recent studies has shown that in a single pass flow type, air cannot be heated to its maximum potential heat capacity because of high thermal losses to the ambient and short residence time of air for the heat extraction. Tables 3 and 4 present the details of thermal performance improvement under single air flow pass using single glazing [26][27][28][29][30][31][32][33] and double-glazing, 10,[34][35][36][37][38] respectively. From Tables 3 and 4, it can be noticed that most of the early studies about single air pass collector revealed that thermal efficiency range from 30% to 50% in both single and double glazing single air pass flow for flat-type solar collectors.…”

Section: Single Pass Air Flow Systemsmentioning

confidence: 99%

“…Types of single airflow pass A, under flow with single glazing, 28,29,31,54 B, under flow with double glazing, 29 C, over flow with single glazing 26,30,32,35,37 and D, over flow with double glazing 10,30,35,37,38 [Colour figure can be viewed at wileyonlinelibrary.com] Hence fin surfaces extend the flow path of the stream and cause better fluid mixing because of the formation of stream-wise and span-wise vortices. 76 Due to better aerodynamic features, pin fins have relatively good heat transfer augmentation surfaces than corrugated and longitudinal fins.…”

Section: F I G U R Ementioning

confidence: 99%

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A comprehensive review of experimental investigation procedures and thermal performance enhancement techniques of solar air heaters

Chamarthi

Singh

2020

Intl J of Energy Research

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This review composition aimed to comprehensively present the experimental investigation procedures and thermal performance augmentation techniques of solar air heaters. Various testing standards such as static and dynamic tests, and performance parameters, such as, thermal, thermo-hydraulic, and exergy efficiencies, are incorporated to present the experimental investigation procedures. The present review work deals with testing conditions (indoor and outdoor), instrumentation, various parameters of interest with corresponding optimum values, their uncertainty levels together with SAH orientation, air flow type, thermal energy storage devices, duct modifications and heat transfer surfaces using fins, baffles, and ribs employed to enhance the thermal performance. The authors of this review work believed that the current composition constitutes a summary of details to quickly access the information for analyzing the various experimental investigation procedures and heat transfer augmentation techniques along with the optimum values of flow and geometric parameters. Moreover, economical and efficient solar air-heating systems with low pressure drop and high heat exchange to air are presented and reviewed.

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“…Initially, packed bed techniques were used by researchers [1]. Thereafter, fins were applied in SAH to improve the performance [2][3][4][5]. Artificially roughened absorber plate is latest technique that is being used [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Correlation for Nusselt Number and Friction Factor for Solar Air Heater Having Absorber Roughened by Chamfered-square Elements

Azad¹

2019

IJFMTS

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The idea of introducing artificial roughness on absorber plate to improve the thermal performance of a solar air heater is very common now days. The technique uses the concept of providing artificial roughness by imbedded element in the absorber plate of the heater. Diagonally chamfered cuboids have been used as roughness element in the current study. A numerical study is performed to investigate the enhancement of the thermo-hydraulic performance of the heater for the various affecting parameters such as Relative Roughness Pitch (Transverse and Longitudinal) of 6 to 14, cross section of cuboids from 8 mm to 14 mm and relative roughness height of 0.44 to 0.088. The range of Reynolds number used in this study was 5000 to 22500. During the study a constant heat flux of 1000 W/m 2 on the absorber plate was considered. The standard k-ε turbulence model with enhanced wall treatment of the ANSYS FLUENT software has been used for numerical computation and to handle the flow turbulence. The Nusselt number and the average friction factor are determined for different values of relative roughness pitch and cross sectional areas of the roughness element. Using calculated computational data correlations for Nusselt number as well as friction factor have been developed as a function of flow and roughness parameters for solar air heaters. The predicted and computational values of Nusselt number and friction factor show a good agreement.

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Thermal efficiency of single-pass solar air collector

Cited by 5 publications

References 9 publications

Thermal Performance of Flat Plate Solar Collectors for Humid and Unpredicted Weather using Air Properties and Energy Method

Thermal Performance of Flat Plate Solar Collectors for Humid and Unpredicted Weather using Air Properties and Energy Method

A comprehensive review of experimental investigation procedures and thermal performance enhancement techniques of solar air heaters

Correlation for Nusselt Number and Friction Factor for Solar Air Heater Having Absorber Roughened by Chamfered-square Elements

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