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Preparation, Sem Characterisation And Proportion Optimization Of Nano Composite Based Cost Effective Solar Absorber

Preparation, Sem Characterisation And Proportion Optimization Of Nano Composite Based Cost Effective Solar Absorber

The merge of solar technology and nano technology is the need of the hour, as this combination can enhance the thermal performance of solar collector. In this connection, it is essential to prepare the nano-composite based absorptive coating for its usage in solar absorbers. It is also essential to characterize the absorptive coating and optimize the proportion of the constituents of the nano-composites. In the present investigation, the nano- composite based absorptive coating was prepared and it was coated on galvanized iron absorber. The prepared coating was characterized and it was found that the sizes of grains were in nano scales. The proportion of the constituents of the nano-composite was optimized and the optimal ratio of carbon and metal oxide was 75:25. On the basis of the generated reliable database of the present investigation, it could be concluded that the nano-structured solar absorber (especially with optimal quantity of constituent based nano-composite coating) would be used in solar collectors not only to have enhanced absorption of radiation but also to have cost effectiveness.

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BEHAVIOR OF BLACK NICKEL TIN SOLAR ABSORBER COATING

BEHAVIOR OF BLACK NICKEL TIN SOLAR ABSORBER COATING

Besides the analysis of the composition of Ni-Sn-P by the above methods, for the black Ni-Sn-P X-ray photoelectron spectroscopy XPS is studied. Thermo SCIENTIFIC K-ALPHA. The optical properties, namely, solar absorbance and ultra violet emittance of the black samples were measured by a solar reflectometer. These instruments provide an average value of solar absorbance and emittance. A PG Instruments T80+ UV–visible double-beam spectrophotometer (PG Instruments, United Kingdom).

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Numerical Study of an Efficient Solar Absorber Consisting of Metal Nanoparticles

Numerical Study of an Efficient Solar Absorber Consisting of Metal Nanoparticles

experiment data [23, 24]. As the metal nanoparticle layers consist of infinite continuous nanoparticles, we choose one metal nanoparticle cell as the simulation model. We plot a unit cell of the periodical single-layer NPA structure in Fig. 1b. A normally incident TM light is incident along the negative y direction with the polarization along the x direction. Therefore, the simula- tion period P is the same as the diameter of the metal nanoparticle (20 nm). The minimum mesh size is set as 0.1 nm. Periodical boundary condition is adopted for single unit cell in Fig. 1b. Perfect match layers (PML) are adopted at the bottom and top of the structure. The absorbance is calculated as A = 1 − R − T , where R is the reflection and T is the transmission. The thickness of the metal substrate is set as 300 nm, which is much lar- ger than its typical skin depth to avoid transmitting light. Thus, there is nearly no transmittance in the overall fre- quency range, and the absorbance of the absorber can be calculated as A = 1 − R .

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Heat transfer in solar absorber plates with micro channels

Heat transfer in solar absorber plates with micro channels

architectural designs, Tripanagnostopoulos et al. (2000) investigated FPCs with coloured (black, blue and red brown) absorbers; they recorded high thermal losses in the unglazed collectors but used flat booster reflectors to increase the radiation falling on the collectors. Juanicó (2008) presented a new design of a roof-integrated water solar collector. Matuska and Sourek (2006) compared the thermal behaviour of façade collectors with standard roof mounted collectors and concluded that façade collectors should have approximately 30% greater area than similar standard FPC in order to have comparable performance. They noted that façade collectors also affect the indoor comfort of buildings by limiting the increase in temperature to no more than 1 °C in all their investigated configurations. A low cost solar water heating system using cement concrete was studied by Chaurasia (2000); the system produced water which varied from 36 °C to 58 °C. A comprehensive review of various approaches to building integration of solar systems is presented by Hestnes (1999).

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A solar air collector with integrated latent heat thermal storage

A solar air collector with integrated latent heat thermal storage

A solar air collector is a basic part of any active solar air system. There are many possible configurations of solar air collectors. One way of classification of air solar collectors is according to the airflow path around the solar absorber. The four basic configurations are: a front-pass collector, a back-pass collector, a front and back pass collector and a through-pass collector. Each configuration is suitable for a different application. The back-pass collectors are usually unglazed. These types of collectors are very often used as facade elements that also reduce the transmission heat loss of a building. A glazed double facade is an example of the front-pass solar air collector. The front and back pass configuration increases the heat exchange area of a collector since the air flows on both sides of the absorber. The highest ratio between the heat exchange surface and the insolated area of the absorber can be achieved in the through-pass configuration where air flows through the cavities (channels) inside the absorber.

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Various Designs of Solar Collectors for Enhancement of Thermal Performance

Various Designs of Solar Collectors for Enhancement of Thermal Performance

In an Integral storage collector unit, the hot water storage tank is the solar absorber. The tank or tanks are mounted on the insulation box with glazing on one side and are painted with black or coated with a selective surface. The sun shines through the glazing and hits the black tank, warming the water inside the tank. The single tanks are typically made of steel, while the tubes are typically made of copper. Achievable temperature with such collectors is a little bit less then in flat-plate collectors. Pool Collector

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Optimization of Single Pass Solar Collector with Fins Absorber Plate

Optimization of Single Pass Solar Collector with Fins Absorber Plate

were also investigated on energy, outlet temperature of air and effective heat gain criteria. Finally the performance of finned SAH is compared with the conventional flat plate SAH. Hachemi [13] carried out his experimental investigation on staggered fin which is soldering underside of the absorber plate. Effect of four different fin length (L) from 2.5 to 20 cm and space between consecutive fin rows (e) 2.5 and 5.0 cm in the staggered fin rows is explored by the author.

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Analysing Efficiency of Solar Collector using ETC Absorber Tube

Analysing Efficiency of Solar Collector using ETC Absorber Tube

---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract – This paper centers around the analyzing efficiency of solar collector using ETC absorber tube. India’s total peak electricity demand in 2017-18 was 164 Gw and is expected to be 235 Gw by 2021-22. Solar energy will play an important role in the future. It is not an easy task to provide energy need of 1.2 billion populations. Lots of Different comes on the way like under development infrastructure, conventional technologies etc. There is an urgent need to Modernise non-conventional source of energy. During experiment source of enegy. During experiment it was found that ordinary collector lies in the range of 9% to 21% and it is increased upto 10% to 23.4% with ETC absorber tube.

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Use The Thermal Efficiency Criterion To Optimize The Fins Dimensions For The Absorber With Fins On A Compact Solar Collector.

Use The Thermal Efficiency Criterion To Optimize The Fins Dimensions For The Absorber With Fins On A Compact Solar Collector.

and 2.5 mm. For the circular fins, the diameter is 2.5 mm. R. Sivakumar and al [11] used the Computational Fluid Dynamics (CFD) studies to simulate a transient heat transfer in an integrated collector-storage type flat plate solar water heater without and with fins, dimples and V- grooves in absorber surface. CFD studies showed an improved heat transfer with increase in depth of fin. The particularity of the solar collectors studied in this work is on the level of the shape of the absorber. This absorber is provided with right fins with rectangular section on its internal face (face wet in water) and also on its external face (Fig 1).

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Optimization of Single Pass Solar Collector with Fins Absorber Plate

Optimization of Single Pass Solar Collector with Fins Absorber Plate

He found that efficiency of finned SAH is increases when distance between consecutive row of fin decreases and considerable enhancement in the air temperature as compared to the flat plate solar air heater was achieved. A. Hachemi [14] carried out his experimental investigation on offset rectangular fin soldering underside of the absorber plate. The fin was placed on the staggered pattern on the absorber plate. The Effect of plate fin length (F L ) and effect of

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Design and Development of Wire Mesh Type Solar Air Heater Unit

Design and Development of Wire Mesh Type Solar Air Heater Unit

Efficiency versus time of the day at different solar radiation of the wire mesh air heater is shown in Fig. 6. The efficiency for most of the cases was found to be increased with the standard local time of the day from morning until 13:30 p.m. with slight decrease in the afternoons. The average efficiency for the wire mesh type solar air heater is 64% at the mass flow rate of 0.0064 kg/s. Generally the thermal efficiency increased as the air mass flow rate was increased.

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Performance Analysis of Solar Air Heater with Finned Vertical Absorber

Performance Analysis of Solar Air Heater with Finned Vertical Absorber

Fig-2: A complete assembly of Actual design. Here total six number of experiment was conducted from 9 am to 8 pm every day in the month of April. The following measurement has been recorded that is air flow rate, temperature of air inside the annulus, solar radiation, and ambient/atmospheric air temperature. Inlet and outlet air temperature and also wind speed. Variation for wind speed was from 0 to 3 m/s for various days and solar radiation was ranging from 40 to 1000 W/m2. And the average annual normal solar radiation for tested location (Mahesana) was found to be 5.87kwh/m2/day. The experiment was conducted for six different conditions to get the best efficiency. The measured conditions for vertical type solar air heater are tabulated in the table. Here among six experimentations first three were performed with specified mass flow rates that is 0.0221, 0.0279 & 0.0349 kg/sec, that is at a speed of 1.9m/s, 2.4 m/s & 3m/s respectively. From the data extracted from experimentation it is clear that temperature difference between inlet and outlet will increase with increase in solar radiation. From the six cases

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Analysing Efficiency of Solar Collector using ETC Absorber Tube

Analysing Efficiency of Solar Collector using ETC Absorber Tube

---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract – This paper centers around the analyzing efficiency of solar collector using ETC absorber tube. India’s total peak electricity demand in 2017-18 was 164 Gw and is expected to be 235 Gw by 2021-22. Solar energy will play an important role in the future. It is not an easy task to provide energy need of 1.2 billion populations. Lots of Different comes on the way like under development infrastructure, conventional technologies etc. There is an urgent need to Modernise non-conventional source of energy. During experiment source of enegy. During experiment it was found that ordinary collector lies in the range of 9% to 21% and it is increased upto 10% to 23.4% with ETC absorber tube.

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Design and Fabrication of Solar Air Heater to Increase Heat Transfer Rate using Artificial Roughness

Design and Fabrication of Solar Air Heater to Increase Heat Transfer Rate using Artificial Roughness

The layout of geometry is shown in fig-1. After the assembly of the heater and its final inspection, the experimental setup was done on the balcony of the college. The blower was turned on an hour prior to taking the temperature readings every time so as to obtain accurate results. Temperature readings of inlet, plate and outlet we taken for three consecutive days at peak hours.The blower attached was used to create suction in the solar air heater. The air is first passed through the S-Pattern on top of the Solar Air Heater. Then it enters the 2nd pass from the hole cutout into the absorber plate and then navigates itself via the fins and to the outlet. The arrangement of fins on absorber plate in v-down discrete pattern is as shown in fig-2

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CFD analysis of solar air heater duct with rectangular rib surface

CFD analysis of solar air heater duct with rectangular rib surface

Solar air heater is one of the basic equipment through which solar energy is converted into thermal energy. Solar collectors in the system for the utilization of solar thermal energy are widely used in various equipments. Solar collectors (air heaters), because of their simplicity in design, are cheap and most widely used devices for solar systems. The main applications of solar air heaters are space heating, seasoning of timber [4], curing of industrial products and these can also be effectively used for curing/drying of concrete/clay building components.

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Design and Fabrication of Solar Air Heater to Increase Heat Transfer Rate using Artificial Roughness

Design and Fabrication of Solar Air Heater to Increase Heat Transfer Rate using Artificial Roughness

A simple solar air collector consists of a flat, dark metal absorber plate encased in an airtight, insulated metal frame with glass over the top. The increase in temperature of air is directly proportional to the flow of air, for which complex designs are used which inhibit roughened surfaces or channels to increase the disturbance of air as it flows through the collector. Commercial manufacturers use black aluminum for the absorber plate. [14]

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Simulation and Analysis of Small-Scale Solar Adsorption Cooling System for Cold Climate

Simulation and Analysis of Small-Scale Solar Adsorption Cooling System for Cold Climate

Summer cooling is a growing market in buildings services. Increased living standards, occupants’ comfort demands and building architectural trends (popular glass buildings) are the main reasons for the increasing energy demand for summer air cooling [1]. Cooling needs are higher in southern European countries. However, there is an increasing need for cooling in other countries too including northern Europe, particularly in office and commercial buildings. Solar energy can significantly contribute to prevent a drastic increase in conventional energy consumption for cooling and to reduce harmful emissions to the environment [2], [3].

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Design and Performance Analysis of Solar Oven with Multi Reflector Arrangement by using Microcontroller

Design and Performance Analysis of Solar Oven with Multi Reflector Arrangement by using Microcontroller

Once visible light has passed through the glass or plastic barrier, it is converted into thermal energy through absorption by a dark object. Dark objects appear dark because they absorb visible light; however, they emit the energy they have absorbed in the form of heat. A solar oven therefore includes both a glass or plastic panel and some type of dark object or surface on the interior for the conversion of light into heat.

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Experimental investigation of rooftop solar chimney for natural 
		ventilation

Experimental investigation of rooftop solar chimney for natural ventilation

Analysis of the experimental measurements on three different designs of roof top solar chimney demonstrate that the system designed with additional absorber plate in the vertical passage, model 3, has the best performance compared with another two designs without additional absorber plate. Model 3 provided the highest average air flow rate and highest heat transfer rate compared to the other investigated models. In terms of air flow rate, model 3 showed improvement of 1.2% and 7.6% compared to model 1and model 2, respectively. The additional of vertical absorber plate increases the heat transfer due to the increase in the contact area between the air particles and the hot absorber surfaces. High buoyancy force is produced and lead to high air flow rate.

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Solar Air Heater with W Shaped Roughness on Absorber Plate

Solar Air Heater with W Shaped Roughness on Absorber Plate

The aim is to find the heat transfer rate from absorber plate of solar air heater. The theoretical and experimental analysis was done of solar air heater with roughness on absorber plate. Presence of W- shaped roughness on absorber plate enhances the Nusselt number and increases the friction factor. On creating the W- shaped surface roughness on absorber plate, the laminar sub-layer breaks and the friction factor as compared to smooth surface found to be increased. In temperature vs time graph the maximum temperature we got is at 56°C and at this particular temperature the thermal efficiency, kinetic energy of molecules and static pressure is maximum.

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