Performance Analysis of Trapezoidal Corrugated Solar Air Heater with Sensible Heat Storage Material

Lakshmi, D.V.N.; Layek, Apurba; Kumar, Pranav

doi:10.1016/j.egypro.2017.03.069

Cited by 63 publications

(19 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The hot air produced by SAH can be used as a source of heat for process heating in industrial applications, crop drying in agriculture, preheating of air in boiler furnaces, etc. Thermal performances of SAHs can be improved passively by providing artificial ribs/protrusions on their absorber plates (Prasad and Saini, 1988;Gupta et al, 1997;Varshney and Saini, 1998;Momin et al, 2002;Jaurker et al, 2006;Bhushan and Singh, 2011;Lanjewar et al, 2011;Tanda, 2011;Yadav and Bhagoria, 2014;Jin et al, 2015;Mahmood et al, 2015;Rajaseenivasan et al, 2015;Maithani and Saini, 2016;Pandey and Bajpai, 2016;Lakshmi et al, 2017;Kumar and Layek, 2018;Kumar and Mohan Jagadeesh Kumar, 2019;Murali et al, 2019) and packed beds (Mittal and Varshney, 2006;Ho et al, 2013;Lakshmi et al, 2017;Mahmood et al, 2015;Singh et al, 2019;Singh, 2020). Prasad and Saini (1988) developed explicit equations to calculate the average Stanton number and average friction factor for the case of internal turbulent flow through SAH corrugated with small diameter protrusion wires.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance of a double-pass solar air heater (SAH) with ribbed absorber surface – an experimental study

Sah¹,

Mandapati²

2020

WJE

View full text Add to dashboard Cite

Purpose Use of packed beds, enhanced tubes, nano-fluids and artificial ribs are few passive techniques to increase heat transfer in solar air heaters (SAHs). Artificial ribs attached to the absorber plate of the SAH will enhance the turbulence near the plate. Experimental analyses are conducted to find the thermal performance of SAH with ribs of regular geometries including rectangular, semi-circular and triangular in cross section. This paper aims to present the improvement in thermal performance of SAH with modified-arc. Design/methodology/approach Absorber plates are designed with ribs of rectangular, triangular, semi-circular and modified-arc in cross-section using existing data in literature. Physical dimensions of the ribs are designed by adapting procedure from literature. Absorber plates are manufactured with ribs and coated with blackboard paint and fixed to the existing SAH. Experiments are conducted with a variable-speed blower fixed to the inlet section of the SAH, which is used to supply air at different mass flow rates in a range between 0.495 and 0.557 kg/min. Findings Efficiency is found to be a strong function of mass flow rate of air through the SAH from the present experimental investigations. It was found that use of modified-arc ribs enhanced the efficiency of SAH by 105.35 per cent compared to SAH with plane absorber plate. Efficiency of SAH with modified-arc ribs is found to be higher by 24.43, 45.61 and 63.21 per cent, respectively, for SAH with semi-circular, rectangular and triangular arc ribs on its absorber plate. Research limitations/implications Experiments on SAH are conducted during daytime from 9:00 am to 5:00 pm in open atmospheric conditions. Solar intensity is continuously changing during the experimentation from morning to evening. Calculations are made based on the observations with average values of solar intensity and temperature readings. More accurate values of SAH efficiency can be obtained with constant heat supply to the absorber plate by simulating the experimental setup in indoor conditions. Temperature and flow rate observations could be more accurate with sophisticated instrumentation rather than using simple thermocouples and orifice meters. Social implications SAHs are basically used to supply hot air for both rural and industrial applications. These are used for crop drying, preheating of air, removal of moisture from leather, chemicals, etc. Conventionally, formers in India are using open sun drying to remove moisture from agricultural products. In this method, the moisture can be removed up to a level of 20 to 25 per cent. Use of SAH can remove moisture up to below 5 per cent and process is clean without reducing the quality of agricultural products. Enhancing the efficiency of SAHs will surely increase its usage by formers for crop drying. Originality/value Use of artificial ribs on absorber plate of SAH is most economical among many of the active and passive techniques. Numerical and experimental investigations are found in literature with regular cross-sectional ribs, including rectangular, triangular and semi-circular. The present work proposed new shape of the ribs named as modified-arc, which was not presented in the literature. Experimental analysis proved that the use of modified-arc makes the SAH more efficient in heat transfer.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermal performance of a double-pass solar air heater (SAH) with ribbed absorber surface – an experimental study

Sah¹,

Mandapati²

2020

WJE

View full text Add to dashboard Cite

show abstract

“…Extensive literature on various types of thermal storage materials and their applications are presented in Farid et al (2004), Zhou et al (2012) and Saxena and Goel (2013). Thermal performance analysis of SAH with sensible heat storage material was discussed by , Singh et al (2015) and Lakshmi et al (2017). Similar analysis with latent heat storage material was discussed by Ahmet koca et al (2008), Kooli et al (2015) and Ali et al (2017).…”

Section: Introductionmentioning

confidence: 94%

“…Solar air heater is had 43.5 per cent collection efficiency and supplied hot air at an average temperature of 43°C for a period of more than 12 h after the sunset. Lakshmi et al (2017) conducted experiments on trapezoidal corrugated SAH with gravel placed below its absorber plate as a sensible heat storage material. The average daily thermal efficiency of flat plate SAH increased by 4 and 24 per cent with the use of trapezoidal corrugations and sensible heat storage material, respectively.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance of a packed bed double pass solar air heater with a latent heat storage system: an experimental investigation

Dosapati¹,

Mandapati²

2019

WJE

View full text Add to dashboard Cite

Purpose Solar energy applications are limited because of its intermittent and discontinuous availability with respect to time. Hence, solar energy thermal conversion systems need integration with thermal storage units (TSUs) to use solar energy in off sunshine hours. This paper aims to perform thermal analysis of a solar air heater (SAH) integrated with a phase change material (PCM)-based TSU to supply hot air during night period. Design/methodology/approach An experimental setup with TSU as main component was prepared with SAH at its upward side, food chamber at its downward side as subcomponents. In TSU, paraffin wax was used as thermal energy storage material. Mass flow rate of air considered as an input parameter in the experiment. Two different absorber plates, namely, plane and ribbed absorber plates were used for the experimentation. Each day for a fixed mass flow of air, observations were made during charging and discharging of PCM. Findings Nusselt number and convection heat transfer coefficients were analytically calculated by considering flow through TSU as external flow over bank of tubes in a rectangular duct. A temperature drop of around 7-8°C during charging of PCM and temperature rise of around 4-5°C during discharging of PCM was observed from the experimental results. The average practical efficiency of TSU with ribbed absorber plate SAH during charging and discharging of PCM was 22 and 6 per cent, respectively, higher than that of TSU with plane absorber plate SAH. Research limitations/implications There are no limitations for research on SAH integrated with TSU. Different PCM including paraffin wax, Glauber’s salt, salt hydrates and water are used for thermal storage. Only limitation is lower efficiency of SAH integrated with TSU because of lower heat transfer coefficients with air as working medium. If it can improve heat transfer coefficients of air then heat transfer rates with these units will be higher. Practical implications There are no practical limitations for research on SAH integrated with TSU. Sophisticated instrumentation is needed to measure flow rates, temperatures and pressure variations of air. Social implications In poultry farms during night, chicks cannot survive at cold climatic conditions. Hence, hot air should be supplied to poultry farms whenever the atmospheric temperature drops. It is proposed that, in combination with TSUs, heat produced by SAH is stored in day time in the form of either sensible or latent heat and is retrieved to provide hot air in the night times. This will reduce total operating costs in poultry farms. Originality/value Conventionally, people are producing hot air by combusting coal in poultry forms. This cost around Rs. 75,000 per month for a batch of 225 to 250 chicks in a poultry form. Hot air could be produced economically during off sunshine hours from SAH integrated with TSU compared to the conventional method of coal burning. Present experimental investigations conducted to fill the literature gap in this area of research and to design a SAH integrated with TSU to produce hot air for poultry forms.

show abstract

“…Adapun penelitian dengan penggunaan penyerap berbentuk gelombang trapesium. Hal tersebut bertujuan untuk meningkatkan luas penampang penyerap, yang dapat meningkatkan perpindahan panas konveksi antara material penyerap, dan udara [4].…”

Section: Pendahuluanunclassified

“…Kesimpulan yang dapat ditarik dari penelitian ini adalah temperatur udara sisi outlet pada kolektor dengan penyerap, bentuk trapesium lebih tinggi daripada kolektor jenis pelat datar. Efisiensi termal maksimum pada pelat datar adalah 15,8% dan 21.5% pada penyerap, bentuk trapesium [4].…”

Section: Pendahuluanunclassified

Experimental Study of Artificial Solar Air Heater Using Trapezoidal Wave Plate

Diana¹,

Safitra²,

Firmansyah³

et al. 2019

r.e.m

View full text Add to dashboard Cite

A solar air heater is needed for the drying process, especially in Indonesia. It means the researches to produce a solar air heater that had high performance is necessary. This research analyses the performance of solar air heater using trapezoidal absorber plate with variation of folded angle 83˚, 85˚, and 87˚. The research carry out artificial experimentally using halogen lamp as a solar simulator. The working principle of solar air heating begins with an induction fan sucking air to enter through the honeycomb then flowing into the air heating duct. The process of heat transfer occurs in a halogen heat lamp passed by the transparent glass and then absorbed by the absorbent plate. This heat will heat the air flowing in the air heating pipe to be transmitted into the drying cupboard. The experiment used several variations of the mass airflow rate 0.022 until 0.051 kg/s and intensity 850, 900, dan 950 W/m2. Temperature measurement is carried out by installing a thermocouple at several points that have been determined. The best performance produced by the wave plate-shaped trapezoidal wave heaters 83˚ when I = 950 W/m2 air mass flow rate 0.022 kg/s with the temperature of the absorbent plate 87 ˚C, the temperature of the exit air 43.2 ˚C, the difference in the rise in air temperature 15.2 ˚C, and when I = 950 W/m2 air mass flow rate 0.051 kg/s the useful heat generated by the air heater 527 Watt, and thermal efficiency 96.8%.

show abstract

Performance Analysis of Trapezoidal Corrugated Solar Air Heater with Sensible Heat Storage Material

Cited by 63 publications

References 6 publications

Thermal performance of a double-pass solar air heater (SAH) with ribbed absorber surface – an experimental study

Thermal performance of a double-pass solar air heater (SAH) with ribbed absorber surface – an experimental study

Thermal performance of a packed bed double pass solar air heater with a latent heat storage system: an experimental investigation

Experimental Study of Artificial Solar Air Heater Using Trapezoidal Wave Plate

Contact Info

Product

Resources

About