This paper focuses on the assessment of possibilities to subsidize the purchase and installation of solar collectors in Poland by government or local government grants and special funds designed for this purpose. It analysis of costs and profi ts resulting from the application of solar installations in the process of heat generation for household requirements, by calculating the payback time, w...

Mg-Ti-H thin films are found to have very attractive optical properties: they absorb 87% of the solar radiation in the hydrogenated state and only 32% in the metallic state. Furthermore, in the absorbing state Mg-Ti-H has a low emissivity; at 400 K only 10% of black body radiation is emitted. The transition between both optical states is fast, robust and reversible. The sum of these properties ...

Retrofitting “nearly-zero energy” heritage buildings has always been controversial, due to the usual association of target with high energy performance and utilization renewable sources in highly regarded cultural values buildings. This paper aims evaluate potential turning building stock into a hot, dry climates, which addressed only few studies. Therefore, four-phase integrated retrofitting m...

Efficiency of ultrathin flexible solar photovoltaic silicon microcell arrays can be significantly improved using nonimaging solar concentrators. A fluorophore is introduced to match the solar spectrum and the low-reflectivity wavelength range of Si, reduce the escape losses, and allow the nontracking operation. In this paper we optimize our solar concentrators using a luminescent/nonluminescent...

sustainable development would be a key solution for climate change and renewable energy plays an important role in this policy. recently, according to increase of co2 emission and other relevant impacts, solar energy has been gaining more attentions from policy makers. thus, compound parabolic concentrators collectors are considered as one of the promising applications from solar thermal advant...

We present an orthogonal concentration method to further confine sunlight within planar solar collectors. Radial-oriented couplers create micro-optic solar concentrators with >375x geometric concentration and a 20% reduction in guiding loss. ©2010 Optical Society of America OCIS codes: (220.1770) Concentrators; (230.7400) Waveguides, slab

This study proposes the concept of the local heat loss coefficient and examines the calculation method for the average heat loss coefficient and the average absorber plate temperature. It also presents an exergy analysis model of flat plate collectors, considering non-uniformity in temperature distribution along the absorber plate. The computation results agree well with experimental data. The ...