The present study describes the optimization of spacer length parameter perforated delta-shaped winglets (PDWs) imposed on absorber plate solar air heater (SAH). An experimental set up is designed to analyze influence artificial roughness (AR) variation thermo-hydraulic performance SAH. variable PDWs ( S pdw ) which varies from0 mm 300 in steps 100 mm. impact Nusselt number Nu , friction factor...

Utilization of solar energy can be found in various domestic and industrial applications. The performance of any solar collector is largely affected by various parameters such as glazing, absorber plate, top covers, and heating pipes. Technology improvements have brought us another method for conversion of solar energy to direct electricity using solar photovoltaic system. Utilization and extra...

With the strong advancement of global carbon reduction strategy and rapid development renewable energy, compressed air energy storage (CAES) technology has received more attention for its key role in large-scale access. This paper summarizes coupling systems CAES wind, solar, biomass energies from perspective system topology, points out advantages limitations each system. It is shown that wind ...

The previous researches focused on the influence of anthropogenic greenhouse gases exerting global warming, but not consider whether desert sand may warm the planet, this could be improved by accounting for sand's physical and geometric properties. Here we show, sand particles (because of their geometry) at the desert surface form an extended surface of up to 1 + π/4 times the planar area of th...

State of the research about the technology of solar energy with LHTS (Latent Heat Thermal Storage ) at home and abroad was firstly introduced, and a fresh air system with solar energy and LHTS was then introduced. After that the fuzzy control system of fresh air temperature was studied. Firstly, a mathematical model of the fan coil was built as the controlled plant. Then, a fuzzy controller was...

[1] Increasing the albedo of urban surfaces has received attention as a strategy to mitigate urban heat islands. Here, the effects of globally installing white roofs are assessed using an urban canyon model coupled to a global climate model. Averaged over all urban areas, the annual mean heat island decreased by 33%. Urban daily maximum temperature decreased by 0.6 C and daily minimum temperatu...