Effectiveness Of Solar Collector Research Articles

Investigation of a parabolic trough solar collector utilising nanofluid and DIW: A relative study

The conventional (Non-renewable) energy reserves are deploying progressively due to increasing population and energy requirements. Due to increasing energy demand, we need to look for the non-conventional (renewable) power reserves which consist of Energy from sun, Wind, geothermal, tides, etc. Solar Energy is one the vast available energy among these renewable energies. Solar energy applications are of outmost requirement these days due to rapid decay of conventional energy resources. Solar Collectors are one of those devices which can be employed for the solar energy utilization. In this work, nano-fluids in combination with parabolic trough solar collectors are investigated. The temperature values at dissimilar flow rates (110LPH and 160LPH) and volume concentration of (0.10% and 0.15% TiO2) were noted and compared with that of the values with water at same mass flow rates. This study has proven that the effectiveness of solar collectors can be increased by employing nanofluids.

Performance enhancement of solar collector using strip inserts and with water based Al2O3/DI water nanofluids

ABSTRACT The effectiveness of solar collector using conical strip inserts with Al2O3/Deionized (DI) water nanofluids is presented in this paper. The experiments were conducted under various volume concentration levels from 0.15% to 0.35% with the interval of 0.05% of the nanofluids coupled with conical strip inserts in the Reynolds number ranging between 4000 and 15000. A higher heat transfer enhancement was observed for 0.35% volume concentration. The heat transfer rate increased by 7.82% at the lowest Reynolds number and 22.34% at the highest Reynolds number. The heat transfer increased further in the presence of conical inserts. It was observed that the heat transfer got enhanced by 28.59% at the lowest Reynolds number and 59.89% at the highest Reynolds number. The combination of nanofluids/Conical strip inserts performed better than nanofluids with no inserts.

Absorber Thickness Effect on The Effectiveness of Solar Collectors to Production Hot Air For Drying

One way to increase the drying rate using a solar collector is to increase the air temperature of the collector and the time of circulation of hot air delivered to the drying chamber. The optimization of heat absorber by utilizing solar energy has been shown to be strongly influence by fluid flow characteristics in the collector channel. This study examined the sharp turning channel on the air passage of a solar collector. Collector size used was 305 cm x 80 cm and had 10 sharp turning channel baffles. Solar radiation absorbent material used in this collector test is iron sand with three thickness variations, namely 3, 6, and 9 cm. The measurement results show that the air temperature that can be produced by the collector with a thickness of 3 cm absorber reaches 85 degree Celsius with an effective drying time of 8 hours and the final air temperature testing on the collector out side still reaches about 40 degree Celsius at air temperature of 32 degree Celsius. At a thickness of 6 cm absorber, the air temperature inside the collector was about 83 degrees and the duration of 10 hours of drying time, with the collector-out air temperature around 39 degree Celsius at the air temperature of 30 degree Celsius. In contrast to the 9 cm thickness of the absorber, the drying air temperature was only 81 degree Celsius and the drying time was 12 hours and the final air temperature measurement was 40 degree Celsius at the ambient temperature was 27 degree Celsius. This result can be seen as the effect of thick collector absorber on solar thermal energy that can also be absorbed by absorber solar collector.

Thermal analysis of insulated north-wall greenhouse with solar collector under passive mode

ABSTRACTAn insulated north wall greenhouse dryer has been fabricated and tested for no-load condition under passive mode. Testing has been conducted in two different cases. Case-I is considered for solar collector kept inside the dryer and Case-II is dryer without solar collector. Convective heat transfer coefficient and various heat transfer dimensionless numbers with have been calculated for thermal analysis. The maximum convective heat transfer coefficient is found 52.18 W/m2°C at 14 h during the first day for Case-I. The difference of the highest convective heat transfer coefficient of both cases was 8.34 W/m2°C. Net heat gain inside room curves are uniform and smooth for Case-I, which shows the steady heat generation process due to presence of solar collector inside the dryer. Above results depicts the effectiveness of solar collector and insulated north wall. The selection of suitable crop for drying can be done by analysing article’s result.

Studies on a Prefabricated Solar Collector Panels

The paper focuses on a new type of solar collector used double plastic-steel windows and covered of double common glasses. To ensure air passage closed and insulation, the collector is prefabricated made in whole. The inside and backplane of collector are covered of heated enamel in dark green with copper oxide, magnesium oxide and iron oxide; The penetrated metal mesh is placed in air passage between absorber and glasses to enhance heat transfer. The size and position of gas inlet and outlet of collector could be specified by means of simulation and analysis. Heat loss coefficients and thermal efficiency are tested. The results show that thermal efficiency of collector is superior and performance of heat preservation is good. The application of collector in solar buildings can replace the Trombe wall and be used as a type of outdoor, easy to regulate their construction process and ensure the effect of solar collector.