Wind Speed Estimation Algorithm in the Presence of Observation Noise
A stochastic hub-height wind speed estimation algorithm for wind turbines, which requires only the rotor angular velocity measurement in the presence of observation noise is proposed. It is assumed th...
A stochastic hub-height wind speed estimation algorithm for wind turbines, which requires only the rotor angular velocity measurement in the presence of observation noise is proposed. It is assumed th...
Optical Characterization of Nonimaging Planar Concentrator for the Application in Concentrator Photovoltaic System
The design and construction of miniature prototype of nonimaging planar concentrator, which is capable of producing much more uniform spatial irradiance and reasonably high concentration ratio, were p...
The design and construction of miniature prototype of nonimaging planar concentrator, which is capable of producing much more uniform spatial irradiance and reasonably high concentration ratio, were p...
Preliminary Study on a Solar Water Heater Using Supercritical Carbon Dioxide as Working Fluid
J. Sol. Energy Eng. -- February 2010 -- Volume 132, Issue 1, 011010 (6 pages)
doi:10.1115/1.4000350
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In this paper, a solar water heater using supercritical carbon dioxide as working fluid is proposed and experimentally studied. For supercritical carbon dioxide, a small change in temperature or pressure can result in large change in density, especially in the state close to the critical point. Thus, natural convective flow of the supercritical carbon dioxide can be easily induced by solar heating or water cooling. Such convective flow absorbs and transports heat to water in solar collector tubes. Motivated by the above idea, an experimental setup was designed, and a solar water heater was tested. The obtained results show that natural convective flow is well induced, and a flow of 1900 Reynolds number can be achieved even in winter, when the lowest level of solar radiation condition occurs. Furthermore, the measured collector and heat recovery efficiencies are 66.0% and 65.0%, respectively. More details of its mechanism are to be studied, and a complete performance analysis is needed.
©2010 American Society of Mechanical Engineers
| History: | Received 10 September 2008; revised 28 June 2009; published 4 January 2010 | |
| doi: | http://dx.doi.org/10.1115/1.4000350 | |
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