one of the effective methods to improve the thermal efficiency of solar collectors is using nanofluids as the coolant. the present study experimentally investigated the effect of sio2/water nanofluid with 1% mass fraction on the performance of a symmetric collector, i.e. conical solar collector. the conical solar collector with 1 m2 area and normal to the earth was tested in ahvaz, a city in th...

The aim of this work is to develop dual purposes solar heating system using a heat pipe evacuated tube collector. transfer fluid between the thermal loads and collector loop was oil. study provided two loads; water baking/cooking that had experimentally investigated under various weather conditions. experimental pilot unit installed in Solar Energy Department, National Research Centre, Giza, Eg...

Heat pipe solar collectors (HPSCs) are heat exchangers that carry based on the phase change of working fluid. It is aimed to increase operating temperature range by changing fluid in at low temperature. For this reason, it has become widespread use nanofluids obtained mixing nanosized metal oxides with base certain proportions order both thermal conductivity fluids and specific closures. The ma...

Solar thermal water heating systems have been developed to replace conventional heating. Therefore, the design of a parabolic cylinder collector-type solar unit with coil-shaped heater (absorber) has carried out. The cylindrical collector is made an aluminum plate covered reflective sticker and base insulated, having diameter, height, length, position focal point 150, 60, 200, 22.4 cm, respecti...

This research aims to investigate the performance solar water collector by varing five parameters; which are mass flowrate, inclination angle, total radiation, pipe size, and number of glass covers. The test rig was established collect data for whole months September October use it as a focal point analysis heating system's performance. dynamic behavior simulated optimizated with MATLAB softwar...

This paper attempts to analyze the propagation characteristics of radio signal inside a partially open drain environment using an empirical approach. The proposed research topic concerns a unique situation in several Asian countries because the drainage systems in these countries differ notably from those in the US and Europe in that the former are partially open on the top while the latter are...

A reference counting garbage collector cannot reclaim unreachable cyclic structures of objects. Therefore, reference counting collectors either use a backup tracing collector seldom, or employ a cycle collector to reclaim cyclic structures. Recently, the first on-the-fly cycle collector, that may run concurrently with program threads, was presented by Bacon and Rajan [3]. This demonstrated the ...

the shape of a solar collector is an important factor in solar-to-thermal energy conversion. conical shape is one of the stationary and symmetric shapes that can be employed as a solar water heater. flow rate of working fluid on the solar collector has an important effect on the efficiency of the collector. the present study is an experimentally investigated of the performance of the solar coni...