Optical Performance of Conical Windows for Concentrated Solar Radiation

1994 ◽  
Vol 116 (1) ◽  
pp. 47-52 ◽  
Author(s):  
A. Kribus
Keyword(s):  
Incident Radiation ◽  
Combined Cycle ◽  
Radiative Energy ◽  
Actual Distribution ◽  
Radiative Energy Transfer ◽  
Input Radiation ◽  
Overall Performance ◽  
Concentrated Solar Radiation ◽  
Solar Receiver ◽  
Collection Methods

Radiative energy transfer through a truncated cone window with a back-plane reflector is considered. This geometry is proposed for a high-pressure direct-radiation (volumetric) central solar receiver for use in combined-cycle electricity generation. The transmission and loss characteristics, computed by ray-tracing, are parameterized by the angle of incident radiation relative to the cone axis. The overall performance of the window is an integral of the angle-dependent transmission data, weighted by the actual distribution of input radiation, over all incidence angles. This parameterization provides insight and assists in tailoring of the window geometry to different solar collection methods. Results are presented for several window geometries. Overall window performance is presented for a dish-type distribution of input radiation.

Non-radiative energy transfer in aqueously dispersed polymeric nanoparticles for photovoltaic applications

2021 ◽  
Vol 275 ◽  
pp. 116740
Author(s):  
Maiara de Jesus Bassi ◽  
Luana Wouk ◽  
Wesley Renzi ◽  
Camilla Karla Oliveira ◽  
José Leonil Duarte ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Polymeric Nanoparticles ◽  
Radiative Energy ◽  
Radiative Energy Transfer ◽  
Photovoltaic Applications

scholarly journals Challenges in 3D Live Cell Imaging

Photonics ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 275
Author(s):  
Herbert Schneckenburger ◽  
Verena Richter
Keyword(s):  
Live Cell Imaging ◽  
Laser Scanning ◽  
Cell Imaging ◽  
Live Cell ◽  
Laser Scanning Microscopy ◽  
Radiative Energy ◽  
Wide Field ◽  
Optical Sectioning ◽  
Continuous Increase ◽  
Radiative Energy Transfer

A short overview on 3D live cell imaging is given. Relevant samples are described and various problems and challenges—including 3D imaging by optical sectioning, light scattering and phototoxicity—are addressed. Furthermore, enhanced methods of wide-field or laser scanning microscopy together with some relevant examples and applications are summarized. In the future one may profit from a continuous increase in microscopic resolution, but also from molecular sensing techniques in the nanometer range using e.g., non-radiative energy transfer (FRET).

Experimental and Numerical Analyses of a Pressurized Air Receiver for Solar-Driven Gas Turbines

2010 ◽  
Author(s):  
Illias Hischier ◽  
Pascal Leumann ◽  
Aldo Steinfeld
Keyword(s):  
Power Generation ◽  
Monte Carlo ◽  
Steady State ◽  
Gas Turbines ◽  
Porous Ceramic ◽  
Operating Pressure ◽  
Radiative Fluxes ◽  
Monte Carlo Techniques ◽  
Concentrated Solar Radiation ◽  
Solar Receiver

A high-temperature pressurized air-based receiver for power generation via solar-driven gas turbines is experimentally and theoretically examined. It consists of an annular reticulate porous ceramic (RPC) foam concentric with an inner cylindrical cavity-receiver exposed to concentrated solar radiation. Absorbed heat is transferred by combined conduction, radiation, and convection to the pressurized air flowing across the RPC. The governing steady-state mass, momentum and energy conservation equations are formulated and solved numerically by coupled Finite Volume and Monte Carlo techniques. Validation is accomplished with experimental results using a 1 kW solar receiver prototype subjected to average solar radiative fluxes in the range 1870–4360 kW m−2. Experimentation was carried out with air and helium as working fluids, heated from ambient temperature up to 1335 K at an absolute operating pressure of 5 bars.

Numerical Investigation of Cowl Lip Adjustments for a Rocket-Based Combined-Cycle Inlet in Takeoff Regime

2016 ◽  
Vol 33 (3) ◽  
Author(s):  
Lei Shi ◽  
Xiaowei Liu ◽  
Guoqiang He ◽  
Fei Qin ◽  
Xianggeng Wei ◽  
...  
Keyword(s):  
Numerical Integration ◽  
Numerical Investigation ◽  
Flow Separation ◽  
Static Condition ◽  
Combined Cycle ◽  
Variable Geometry ◽  
Overall Performance ◽  
Negative Impacts

AbstractNumerical integration simulations were performed on a ready-made central strut-based rocket-based combined-cycle (RBCC) engine operating in the ejector mode during the takeoff regime. The effective principles of various cowl lip positions and shapes on the inlet operation and the overall performance of the entire engine were investigated in detail. Under the static condition, reverse cowl lip rotation in a certain range was found to contribute comprehensive improvement to the RBCC inlet and the entire engine. However, the reverse rotation of the cowl lip contributed very little enhancement of the RBCC inlet under the low subsonic flight regime and induced extremely negative impacts in the high subsonic flight regime, especially in terms of a significant increase in the drag of the inlet. Changes to the cowl lip shape provided little improvement to the overall performance of the RBCC engine, merely shifting the location of the leeward area inside the RBCC inlet, as well as the flow separation and eddy, but not relieving or eliminating those phenomena. The results of this study indicate that proper cowl lip rotation offers an efficient variable geometry scheme for a RBCC inlet in the takeoff regime.

Modelling unusually fast non-radiative energy transfer in crystals

1994 ◽  
Vol 4 (1) ◽  
pp. 31-33 ◽  
Author(s):  
S.R. Rotman ◽  
A. Eyal ◽  
Y. Kalisky ◽  
A. Brenier ◽  
C. Pedrini ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Radiative Energy ◽  
Radiative Energy Transfer
Sign in / Sign up

Export Citation Format

Share Document