Post-installation heliostat field aiming strategy optimization based on heliostat flux distribution measurements

The technological innovation in the field of lighting and the need to reduce energy consumption connected to public lighting are leading many municipalities to undertake the renewal of public lighting systems, by replacing the existing luminaires with LED technologies. This renovation process is usually aimed at increasing energy efficiency and reducing maintenance costs, whist improving the lighting performance. To achieve these results, the new luminaires are often characterised by a luminous flux distribution much more downward oriented, which may remarkably influence and alter the perception of the night image of the sites. In this study the implications of the renovation of public lighting systems in terms of lighting and energy performance as well as the effects relating to the alteration of the night image, in historical contexts characterized by significant landscape value, are analysed. Results, along with demonstrating the positive effect that more sustainable and energy efficient lighting systems may have on the lighting performance and energy consumptions of public lighting systems, evidences the impact they may have on the alteration of the nocturnal image.

Download Full-text

Modeling and simulation of 1MWe solar tower plant’s solar flux distribution on the central cavity receiver

Simulation Modelling Practice and Theory ◽

10.1016/j.simpat.2012.07.011 ◽

2012 ◽

Vol 29 ◽

pp. 123-136 ◽

Cited By ~ 35

Author(s):

Qiang Yu ◽

Zhifeng Wang ◽

Ershu Xu ◽

Hongli Zhang ◽

Zhenwu Lu ◽

...

Keyword(s):

Modeling And Simulation ◽

Flux Distribution ◽

Solar Flux ◽

Central Cavity

Download Full-text

Interaction of Wheelspace Coolant and Main Flow in a New Aeroderivative LPT

Volume 6: Turbomachinery, Parts A and B ◽

10.1115/gt2006-90877 ◽

2006 ◽

Cited By ~ 2

Author(s):

Francesco Montomoli ◽

Michela Massini ◽

Nicola Maceli ◽

Massimiliano Cirri ◽

Luca Lombardi ◽

...

Keyword(s):

Flux Distribution ◽

Low Pressure ◽

Main Flow ◽

Space Region ◽

Heat Flux Distribution ◽

Gas Generator ◽

Component Reliability ◽

Accuracy Requirement ◽

Low Pressure Turbine ◽

Hot Gas

Increased computational capabilities make available for the aero/thermal designers new powerful tools to include more geometrical details, improving the accuracy of the simulations, and reducing design costs and time. In the present work, a low-pressure turbine was analyzed, modeling the rotor-stator including the wheel space region. Attention was focused on the interaction between the coolant and the main flow in order to obtain a more detailed understanding of the behavior of the angel wings, to evaluate the wall heat flux distribution, and to prevent hot gas ingestion. Issues of component reliability related to thermal stress require accurate modeling of the turbulence and unsteadiness of the flow field. To satisfy this accuracy requirement, a full 3D URANS simulation was carried out. A reduced count ratio technique was applied in order to decrease numerical simulation costs. The study was carried out to investigate a new two-stage Low Pressure Turbine from GE Infrastructure Oil&Gas to be coupled to a new aeroderivative gas generator, the LM2500+G4, developed by GE Infrastructure, Aviation.

Download Full-text

Comparison of core loss and magnetic flux distribution in amorphous and silicon steel core transformers

Electrical Engineering ◽

10.1007/s00202-017-0574-7 ◽

2017 ◽

Vol 100 (2) ◽

pp. 1125-1131 ◽

Cited By ~ 2

Author(s):

Atabak Najafi ◽

Ires Iskender

Keyword(s):

Magnetic Flux ◽

Flux Distribution ◽

Core Loss ◽

Silicon Steel ◽

Steel Core

Download Full-text

Design of a New 45 kWe High-Flux Solar Simulator for High-Temperature Solar Thermal and Thermo-Chemical Research

Volume 5: Energy Systems Analysis, Thermodynamics and Sustainability; NanoEngineering for Energy; Engineering to Address Climate Change, Parts A and B ◽

10.1115/imece2010-40492 ◽

2010 ◽

Author(s):

Katherine R. Krueger ◽

Jane H. Davidson ◽

Wojciech Lipin´ski

Keyword(s):

High Temperature ◽

Focal Plane ◽

Flux Distribution ◽

Solar Thermal ◽

Optimized Design ◽

High Flux ◽

Chemical Research ◽

Solar Simulator ◽

Peak Flux ◽

The Common

In this paper, we present a systematic procedure to design a solar simulator for high-temperature concentrated solar thermal and thermo-chemical research. The 45 kWe simulator consists of seven identical radiation units of common focus, each comprised of a 6.5 kWe xenon arc lamp close-coupled to a precision reflector in the shape of a truncated ellipsoid. The size and shape of each reflector is optimized by a Monte Carlo ray tracing analysis to achieve multiple design objectives, including high transfer efficiency of radiation from the lamps to the common focal plane and desired flux distribution. Based on the numerical results, the final optimized design will deliver 7.5 kW over a 6-cm diameter circular disc located in the focal plane, with a peak flux approaching 3.7 MW/m2.

Download Full-text