scholarly journals Effect of Boosting Solar Radiation Intensity on Thermal and Hydraulic Performance and Characteristics of Forced Circulation Food Dryer Provided with Roughened Solar Air Heater

2020 ◽  
Vol 9 (4) ◽  
pp. 2180-2186
Keyword(s):  
Moisture Content ◽  
Specific Humidity ◽  
Solar Air Heater ◽  
Forced Circulation ◽  
Air Heater ◽  
Solar Radiation Intensity ◽  
Solar Intensity ◽  
Parabolic Reflectors ◽  
Solar Heater ◽  
Food Dryer

This paper focus on effects of boosting solar intensity on the thermal performance of solar food dryer coupled with roughened solar heater. Boosting of solar intensity increases the temperature of air entering into the food dryer without changing the specific humidity. The methods which have been used to increase the intensity of incidence radiation on the collector of food dryer are plane mirrors with tracking, parabolic reflectors and compound parabolic concentrator. It has been observed experimentally that boosting intensity improves performance characteristics of solar air heater and food dryer. It increases collector efficiency, dryer efficiency, loss of moisture content and diminishes the moisture content in the product at any time.

The Influence of Internal Heat Storage Material and Longitudinal Fins on a Double-Pass Solar Air Heater Performance

2020 ◽  
Vol 143 (1) ◽  
Author(s):  
H. Sivarathinamoorthy ◽  
G. Sureshkannan
Keyword(s):  
Heat Storage ◽  
Internal Heat ◽  
Solar Air Heater ◽  
Storage Material ◽  
Double Pass ◽  
Air Heater ◽  
Sunshine Hours ◽  
Heat Storage Material ◽  
Solar Intensity ◽  
Overall Performance

Abstract This study presents the overall performance of a double-pass solar air heater (DPSAH) with three different configurations: (i) double-pass solar air heater without fins and heat storage (DPSAHWF), (ii) double-pass solar air heater with longitudinal fins and without heat storage (DPSAHLF), and (iii) double-pass solar air heater with longitudinal fins and heat storage (DPSAHLFHM). Five longitudinal fins on the upper channel and granular carbon at the bottom of lower channel as heat storage material were used for the analysis. Each configuration was examined for the following flowrates of air (ṁ1 = 0.008 kg/s, ṁ2 = 0.012 kg/s, and ṁ3 = 0.016 kg/s). The results show an improvement in thermal efficiency with an increase in the air flowrate. The outlet air temperature increases considerably with a decrease in flowrate, for all the three orientations. The lowest and the highest efficiencies during the peak sunshine hours were recorded as 33% and 65% for the conventional heater and the heater with fins and heat storage material, respectively. A maximum of 849 W/m2 of solar intensity was recorded during the test period. The system is also examined for thermal discharge after the sunshine hours to determine the effectiveness of the heat storage material.

Effect of solar intensity on efficiency of the convection solar air heater

2012 ◽  
Vol 4 (4) ◽  
pp. 042901 ◽  
Author(s):  
M. Sekar ◽  
M. Sakthivel ◽  
S. Satheesh kumar ◽  
C. Ramesh
Keyword(s):  
Solar Air Heater ◽  
Air Heater ◽  
Solar Intensity

scholarly journals Various Designs of Solar Collectors for Enhancement of Thermal Performance

2011 ◽  
Vol 8 (1) ◽  
pp. 101-105
Author(s):  
M. K. Lalji ◽  
R. M. Sarviya ◽  
J. L. Bhagoria
Keyword(s):  
Thermal Performance ◽  
Thermal Efficiency ◽  
Energy Demand ◽  
Packed Bed ◽  
Wire Mesh ◽  
Solar Air Heater ◽  
Air Heater ◽  
The Matrix ◽  
Solar Heater ◽  
Economical Alternative

Solar energy is an economical alternative to the today's energy demand. Solar air heater is used for heating the air economically but produces low thermal efficiency. In this paper, an attempt has been made to study the design of solar heaters to increase the thermal efficiency. The matrix solar air heater with a wire mesh produces higher thermal efficiency over the conventional flat plate solar air heater. The evaluation of different methods for increasing efficiency of packed bed solar air heater has been done . Effect of different parameters on thermal efficiency of solar heater has also been studied.

scholarly journals Thermal and Cost Analysis of a Multi-Pass Solar Air Heater with Reversed Absorber and Reflector

2020 ◽  
pp. 141-146
Keyword(s):  
Cost Analysis ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Cost Effective ◽  
Solar Air Heater ◽  
Constant Mass ◽  
Air Heater ◽  
Effectiveness Model ◽  
Solar Intensity

Solar air heater is a major component of solar dryer. A model of multi pass solar air heater (MPSAH) with reversed absorber and reflector was developed. Exhaustive Study over the performance of MPSAH with and without reversed absorber and cost analysis was done. The performance curves show the effect of solar intensity on MPSAH with and without reversed absorber at constant mass flow. It was observed that the thermal efficiency of MPSAH is depending on solar intensity and losses when mass flow rate remain constant. At constant mass flow rate 26.90 gm/sec, the collector efficiency increased by 9% at average solar intensity 457w/m². Theoretical and experimental analysis showed close agreement. In addition the cost-effectiveness model has been used to examine the performance MPSAH with and without reverse absorbers. The air heaters annual cost (AC) estimation and annual power acquirement (AG) was analyze. The result is evidence for that multi-pass solar air heater with reverse absorbers and reflector is more cost-effective than multi-pass solar collectors without reverse absorber.

Analytical Modeling and Optimization of a Solar Chimney Power Plant

2016 ◽  
Vol 25 ◽  
pp. 78-88 ◽  
Author(s):  
Cherif Khelifi ◽  
Fateh Ferroudji ◽  
Mohammed Ouali
Keyword(s):  
Power Plant ◽  
Electrical Power ◽  
Operating Conditions ◽  
Solar Air Heater ◽  
Solar Chimney ◽  
Operating Cycle ◽  
Promising Alternative ◽  
Air Heater ◽  
Solar Radiation Intensity ◽  
Solar Chimney Power Plant

Wind and solar resources are diluted and intermittent on the earth; their combination allowed increasing their availability and stability. At great scale, the use of Solar Chimney Power Plant (SCPP) technique constitutes a promising alternative to fossil fuel for generating electrical power particularly in rich regions of natural resources such as solar, wind, terrain, built material, water…etc.). Recently, various research works investigate the design and optimization of these systems under operating conditions. The analysis of different studies carried out on (SCPP), allowed to develop a parametric modelization approach in steady state, founded on 1D heat and mass transfer inside the (SCPP) in order to describe, optimize and to assess its performances under the influence of geometric, operating and ambiance conditions using Matlab-Simulink code. From the present simulation results, the (SCPP) appeared feasible since the temperature gradient of the airflow between the inlet and outlet of the chimney attains 13°C and remains constant during operating cycle. The (SCPP) output is strongly influenced by solar radiation intensity, air heater surface, and chimney height. The solar air heater, the tower (chimney) and the (SCPP) efficiencies obtained are 22.6%, 19.2% and 2.6% respectively.

Design and Development of V-Grooved Natural Convection Solar Air Heater for Odisha

2015 ◽  
Vol 813-814 ◽  
pp. 668-673
Author(s):  
D.V.N. Lakshmi ◽  
S.S. Mohapatra ◽  
Anbalgan Satheesh ◽  
Harish Das
Keyword(s):  
Experimental Study ◽  
Natural Convection ◽  
Mass Flow Rate ◽  
Air Temperature ◽  
Flow Rate ◽  
Meteorological Conditions ◽  
Second Law ◽  
Solar Air Heater ◽  
Air Heater ◽  
Solar Heater

This paper presents an experimental study of natural convection V-grooved solar heater. Based on the experimental study, the first law and second law efficiencies and entropy generation have been calculated considering the available radiation under the meteorological conditions of Bhubaneswar, Odisha, India. Experiments were conducted during the month of November 2014 to March, 2015 for studying the performance characteristics of the solar air heater. The results obtained are quite significant with respect to outlet air temperature as compared to other solar heaters. The maximum air heater efficiency was found to be 16.91%, calculated at a mass flow rate of 3.55 gm/s of air and the second law efficiency was 6.72%.

scholarly journals Eco-Friendly and Economical Solar Heater Design Using Internal Structure and Phase Change Materials

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7423
Author(s):  
Jihu Lee ◽  
Sung-Hun Son ◽  
Kibum Kim
Keyword(s):  
Phase Change ◽  
Internal Structure ◽  
Air Temperature ◽  
Phase Change Materials ◽  
Operating Conditions ◽  
Internal Space ◽  
Solar Air Heater ◽  
Air Heater ◽  
Solar Heater ◽  
Heater Design

Indoor heating systems currently used are highly dependent on fossil fuels; hence, it is urgent to develop a new heating system to achieve carbon zero-emission. A solar air heater is eco-friendly because it generates nearly zero greenhouse gases. In this study, a parametric study was conducted for optimizing solar air heater design applicable to indoor heating. Installing the internal structure in the solar heater changes the interior flow characteristic, resulting in the air temperature increased by about 14.2 K on average compared to the heater without the internal structure. An additional case study was carried out to optimize the ideal quantity of phase change materials (PCM) in terms of mass fraction and heat capacity for various operating conditions. An excessive amount of PCM (e.g., 66% of the storage space filled with PCM) deteriorates the performance of the air heater unless the entire PCM could be melted during the daytime. After heating, the air temperature was maintained the longest when only 33% of the internal space was filled with PCM. The solar air heater can fully replace or partly assist a conventional heater for indoor heating, and it could reduce approximately 0.6 tCO2 per year.

scholarly journals Experimental Study on Solar Air Heating

2018 ◽  
Vol 14 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Miqdam T Chaichan ◽  
Ali J. Ali ◽  
Khaleel I. Abass
Keyword(s):  
Fossil Fuels ◽  
Solar Air Heater ◽  
Horizontal Section ◽  
Air Heater ◽  
Air Movement ◽  
Winter Conditions ◽  
Air Heating ◽  
Solar Intensity ◽  
Vertical Part ◽  
New Type

Abstract   A new type of solar air heater was designed, fabricated, and tested in Baghdad, Iraq winter conditions. The heater consists of two main parts. The horizontal section was filled with the black colored iron chip while the vertical part has five pipes filled with Iraqi paraffin wax. A fan was fixed at the exit of the air. Two cases were studied: when the air moved by natural convection and when forced convection moved it. The studied air heater has proven its effectiveness as it heated the air passing through it to high temperatures. The results manifest that using little air movement makes the temperatures, stored energies, and efficiencies of the two studied cases converge. The suitable solar intensity of Baghdad city makes the use of solar air heater suitable to reduce the electricity and fossil fuels consumption.    

PERFORMANCE ANALYSIS OF DOUBLE PASS COUNTER FLOW SOLAR AIR HEATER FOR DRYING APPLICATION

2018 ◽  
Author(s):  
D.V.N. Lakshmi ◽  
Palanisamy Muthukumar ◽  
Dr.Apurba Layek ◽  
Abhimanyu Kumar Singh ◽  
Sushoban Das
Keyword(s):  
Performance Analysis ◽  
Solar Air Heater ◽  
Double Pass ◽  
Counter Flow ◽  
Air Heater
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