Experimental thermodynamic analysis of a forced convection solar air heater using absorber plate with pin-fins

Journal of Thermal Analysis and Calorimetry - This research paper deals with the experimental thermodynamic analysis of a forced convection solar air heater using pin-fin absorber plate and...     

Thermal performance evaluation of a solar air heater with and without thermal energy storage

This communication presents the experimental study and performance analysis of a solar air heater with and without phase change material (PCM) viz. paraffin wax and hytherm oil. There are three different arrangements viz. without PCM, with PCM and with hytherm oil to study the comparative performance of this experimental system. Inlet, outlet temperatures and radiation with respect to time have been recorded and found that the output temperature in case with thermal energy storage (TES) is higher than that of without TES, besides, the outlet temperature with paraffin wax is slightly greater than that of with hytherm oil. Also there is no energy gain in the evening in case of without TES but in case of with TES there is a heat gain for around 4 h in the evening which gives the backup for hot air for around four more hours which is the main advantage of this systems with TES. Based on the data, the efficiency of the system has been calculated and it is noted that the efficiency in the case of heat storage is higher than that of without TES, besides the efficiency in the case of the paraffin wax is slightly higher than that of the hytherm oil case.     

Second law of thermodynamics analysis for nanofluid turbulent flow inside a solar heater with the ribbed absorber plate

Journal of Thermal Analysis and Calorimetry - Employing rough surfaces and nanofluids in solar heater ducts are recognized as effective techniques to improve thermal performances of these devices....     

Heat transfer and exergy analysis of solar air heater tube with helical corrugation and perforated circular disc inserts

Journal of Thermal Analysis and Calorimetry - The effects of perforated circular disc swirl generator on heat transfer (HT) and flow fields in a solar air heater helical corrugated tube have been...     

Analytical investigation of exergetic performance on jet impingement solar air heater with multiple arc protrusion obstacles

Journal of Thermal Analysis and Calorimetry - In this present work, an exergetic efficiency of the solar air heater (SAH) with jet impingement on multiple arc protrusion roughened absorber plate is...     

Energetic,exergetic and enviro-economic analysis of parallel pass jet plate solar air heater with artificial roughness

Journal of Thermal Analysis and Calorimetry - In this work, the thermal performance of single-pass double-duct jet plate solar air heater with various designs of artificial roughness is analyzed by...     

Thermal performance enhancement of solar air collector using a novel V-groove absorber plate with pin-fins for drying agricultural products: an experimental study

Journal of Thermal Analysis and Calorimetry - An experimental investigation of a novel V-groove absorber plate with pin-fins on double-pass solar air collector was made to study the enhancement of...     

Analytical predictions of exergoeconomic performance of a solar air heater with surface roughness of metal waste

Journal of Thermal Analysis and Calorimetry - The current study is the authors’ next work from the perspectives of the second law and economics of an air collector having artificial roughness...     

Experimental analysis and exergetic assessment of the solar air collector with delta winglet vortex generators and baffles

Journal of Thermal Analysis and Calorimetry - To increase the efficiency of solar air collectors (SACs), the combined effects of baffles and delta winglet vortex generator (DWLVG) on the...     

Numerical analysis on flow and performance characteristics of a small-scale solar updraft tower (SUT) with horizontal absorber plate and collector glass

Journal of Thermal Analysis and Calorimetry - A numerical analysis has been performed to examine and assess the flow and performance characteristics of the solar updraft tower (SUT) power plant. A...     

Effects of thermal conductivity and geometry of materials on the temperature variation in packed bed solar air heater

The efficiency of energy collection of a flat plate type of solar air heater is low because of the large thermal losses and low heat transfer coefficient between the absorber plate and the air flowing in the duct. Packed beds have been successfully employed for the enhancement of the heat transfer coefficients in solar air heaters and such air heaters can be used for drying agricultural produce and space heating as well. This article deals with the theoretical investigation on the effects of thermal conductivity of material and geometry of a screen on the temperature variation in woven wire screen packed bed solar air heater. Theoretical results have been compared with the experimental results reported earlier by other researchers and found to match reasonably well with them. It has been found that the thermal performance depends upon a little on the thermal conductivity of screen material. Instead, it depends more on the geometry and an extinction coefficients of the matrix. A low value of extinction coefficient is desirable for maximum absorption of solar radiations and minimum thermal losses. The numerical method of analysis used here is based on finite difference approximation. The finite difference equations have been solved through a computer program in C⁺⁺.     

Performance analysis of a double-pass solar air heater system with asymmetric channel flow passages

Journal of Thermal Analysis and Calorimetry - The present work seeks to address the forced convection heat transfer behaviour of a double-pass solar air heater system (DPSAHS) provided with...     

Experimental investigation on solar thermal air heater with a combination of roughness elements for heat transfer improvement

Journal of Thermal Analysis and Calorimetry - This work attempts to determine the influence of the integration of a combination of roughness elements on the heat dissipation and frictional losses...     

Thermal performance modeling of modified absorber wall of solar chimney-shaped channels system for building ventilation

Journal of Thermal Analysis and Calorimetry - This paper aims to compare the thermal performance of four different configurations of absorber wall for the solar chimney-shaped channels. A detailed...     

Experimental study of thermal performance and pressure drop on a solar air heater with different orientations of arc-shape rib roughness

Journal of Thermal Analysis and Calorimetry - An exhaustive experimental investigation was carried out for the thermal performance of artificially roughened solar air heaters (SAHs) under the...     

Use of sinusoidal surface profile in the absorber tube of a parabolic trough solar collector to enhance its thermal performance

Journal of Thermal Analysis and Calorimetry - In this work, the primary objective is to develop a sinusoidal wave profile at the inner surface of an absorber tube, study with different working...     

Investigation on influence of dimpled surfaces on heat transfer enhancement and friction factor in solar water heater

Journal of Thermal Analysis and Calorimetry - The solar water heating system efficiently converts available solar energy into useful thermal energy. The collector is the predominant unit of the...     

Effect of coadsorbent properties on the photovoltaic performance of dye-sensitized solar cells

Stearic acid as a coadsorbent, which has a low dipole moment and high solubility, retarded the rate of dye adsorption during the competitive anchoring process on the TiO(2) layer in dye-sensitized solar cells (DSCs), thereby increasing the content of strongly bound dye on the TiO(2) surface. This resulted in an approximately 25% improvement in both J(SC) and the power conversion efficiency of the DSCs, even for much lower dye coverage.     

Effect of coadsorbent on the photovoltaic performance of zinc pthalocyanine-sensitized solar cells

The effect of chenodeoxycholic acid as a coadsorbent on TiO 2 nanocrystalline solar cells incorporating phthalocyanine sensitizers was studied under various conditions. Adding chenodeoxycholic acid onto TiO 2 nanoparticles not only reduces the adsorption of phthalocyanine sensitizers but also prevents sensitizer aggregation, leading to different photovoltaic performance. The inspection of IPCE and absorption spectra showed that the load of phthalocyanine sensitizers is strongly dependent on the molar concentration of chenodeoxycholic acid coadsorbent. The open circuit voltage of the solar cells with chenodeoxycholic acid coadsorbent increases due to the enhanced electron lifetime in TiO 2 nanoparticles coupled with the band edge shift of TiO 2 to negative potentials.