The present work deals with the theoretical study on heat transfer characteristics and the performance of a cylindrical parabolic solar water heater with twisted tape inserted inside the absorber tube. The absorber tube equipped with twisted tape with six different twist ratios 5, 6, 7, 8, 9 and 10. The theoretical work is conducted in a turbulent flow regime and considering water as a working ...

This study analyzes the thermal performance of solar thermal energy using double-pass absorber plate in Sanandaj, Iran. To this end, a mathematical model was encoded according to the energy and exergy balance equations and solved by MATLAB software. Given the environmental conditions and radiation intensity of a winter day in Sanandaj, the effects of external parameters such as radiation intens...

We use a halo occupation approach to connect Mg II absorbers to dark matter halos as a function of redshift. Using the model constructed in Tinker & Chen (2008), we parameterize the conditional probability of an absorber of equivalent width Wr being produced by a halo of mass Mh at a given redshift, P(Wr|Mh,z). We constrain the free parameters of the model by matching the observed statistics of...

The CBM muon detection system is designed to measure muon pairs from the decay of vector mesons (ρ, ω, φ, J/ψ) produced in heavy-ion collisions. At FAIR energies the muon momenta can be rather low, and, therefore, we developed a muon detection concept which a dynamical definition of absorber thickness according to the muon momentum. The actual design of the muon detector system consists of 6 ha...

Machine tool chatter causes an instability that can occur in tool-workpiece-machine system. Hence surface roughness and tool wear in metal cutting processes. This instability caused by interaction between current tool positions and surface left by previous tool passes. Many methods have been developed to minimize the effects of regenerative chatter in machine tools and to enhance the damping ca...

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 ...

The unified picture of X-ray/UV absorbers offers an unique opportunity to probe the nuclear environment of AGNs. To test the unified absorber scenario and to understand the physical properties of the absorber we obtained the first UV spectrum of PG1114+445 using HST FOS. PG1114+445 is known to have an X-ray ionized (“warm”) absorber, so that UV absorption is predicted. The HST spectrum clearly ...

The photovoltaic thermal (PVT) system is an up-and-coming renewable energy technology that simultaneously produces and electrical energy. objective of this paper to improve the efficiency with without ∇-groove absorber. This study experimental investigation under indoor solar simulator at National University Malaysia. characteristic PVT characterized by scheming current (A), voltage (V), power ...

This paper presents a reduce roll vibration of the full vehicle model with passive suspension systems using vibration absorber to change the dynamic system matrix stat’s eigenvalue. Since using the controller system has been splurged and required to energy consuming, in this research the vehicle body roll vibration has been reduced and supplied vehicle stability using a vibration absorber for t...