Journal of Solar Energy Engineering, Transactions of the ASME
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Moment-Based Load and Response Models With Wind Engineering ApplicationsA general method is shown here to model wind loads and responses for reliability applications. This method characterizes the short-term loads and responses by a few summary statistics: specifically, by a limited number of statistical moments. A suite of moment-based models are derived and applied here, illustrating how this statistical moment information can best be utilized. Two examples ... ...
Journal of Solar Energy Engineering, Transactions of the ASME - Tập 122 Số 3 - Trang 122-128 - 2000
Predicted Efficiency of a Low-Temperature Nanofluid-Based Direct Absorption Solar CollectorDue to its renewable and nonpolluting nature, solar energy is often used in applications such as electricity generation, thermal heating, and chemical processing. The most cost-effective solar heaters are of the “flat-plate” type, but these suffer from relatively low efficiency and outlet temperatures. The present study theoretically investigates the feasibility of using a nonconcentrating... ...
Journal of Solar Energy Engineering, Transactions of the ASME - Tập 131 Số 4 - 2009
Inter-Zone Convective Heat Transfer in Buildings: A ReviewResearch work on inter-zone convective heat transfer in buildings is reviewed and the parameters that govern this process are discussed. A limited comparison between the heat transfer rates calculated by existing correlations and those obtained in a full-scale test facility is presented. A number of research areas where more work is needed are identified.
Journal of Solar Energy Engineering, Transactions of the ASME - Tập 109 Số 2 - Trang 71-78 - 1987
Thermodynamic Study of Advanced Supercritical Carbon Dioxide Power Cycles for Concentrating Solar Power SystemsSupercritical CO2 (s-CO2) operated in a closed-loop Brayton cycle offers the potential of higher cycle efficiency versus superheated or supercritical steam cycles at temperatures relevant for concentrating solar power (CSP) applications. Brayton-cycle systems using s-CO2 have a smaller weight and volume, lower thermal mass, and less complex power blocks versus Rankine cycles due to the hig... ...
Journal of Solar Energy Engineering, Transactions of the ASME - Tập 135 Số 4 - 2013
Design of an Experimental Solar-Powered, Solid-Adsorption Ice MakerPurely thermal heat pumps can be devised with adsorbate/solid adsorbent pairs, for example for refrigeration purposes. As each cycle consists of two periods, i.e., heating/desorption/condensation and cooling/adsorption/evaporation, this mode of operation is well-suited to solar energy. After experiments with the Zeolite/Water pair, a solar-powered ice maker was designed with the Activated ... ...
Journal of Solar Energy Engineering, Transactions of the ASME - Tập 108 Số 4 - Trang 332-337 - 1986
A Circuit-Based Approach to Simulate the Characteristics of a Silicon Photovoltaic Module With AgingThe aging of photovoltaic modules results inevitably in a decrease of their efficiency all through their lifetime utilization. An approach to simulate the evolution of electrical characteristics of a photovoltaic module with aging is presented. The photovoltaic module is modeled by an equivalent electrical circuit whose components have time-dependent characteristics determined under accele... ...
Journal of Solar Energy Engineering, Transactions of the ASME - Tập 137 Số 2 - 2015
A Fundamental Equation for Exergy Balance on Solar CollectorsThis paper presents the exergy balance equation on a solar collector which acts as the fundamental and principal expression for the solar thermal design. The equation fully explains the exergy loss processes and can be used to derive the approximate optimum operating condition for solar collectors. Furthermore, using the equation, it can be shown that two different collectors, an evacuated... ...
Journal of Solar Energy Engineering, Transactions of the ASME - Tập 110 Số 2 - Trang 102-106 - 1988
Appropriate Thermodynamic Performance Measures for Closed Systems for Thermal Energy StorageSeveral definitions of energy and exergy efficiency for closed systems for thermal energy storage (TES) are developed and discussed. A simple model is utilized in which heat quantities are transferred at specified temperatures to and from a TES. Efficiency definitions are considered for the overall storage process and for the three component periods which comprise a complete storage proces... ...
Journal of Solar Energy Engineering, Transactions of the ASME - Tập 114 Số 2 - Trang 100-105 - 1992
Variable Speed Drive Volumetric Tracking for Airflow Control in Variable Air Volume SystemsAn airflow control method has been developed for variable air volume (VAV) systems. This airflow control method is termed VSD volumetric tracking (VSDVT) since both the supply and return airflows are determined using signals of variable speed drives (VSD) instead of flow stations. Its performance is studied and compared with the fan tracking (FT) method using model simulations. For the sim... ...
Journal of Solar Energy Engineering, Transactions of the ASME - Tập 125 Số 3 - Trang 318-323 - 2003
High Temperature Thermal Energy Storage Utilizing Metallic Phase Change Materials and Metallic Heat Transfer FluidsCost and volume savings are some of the advantages offered by the use of latent heat thermal energy storage (TES). Metallic phase change materials (PCMs) have high thermal conductivity, which relate to high charging and discharging rates in TES system, and can operate at temperatures exceeding 560 °C. In the study, a eutectic aluminium–silicon alloy, AlSi12, is identified as a good potenti... ...
Journal of Solar Energy Engineering, Transactions of the ASME - Tập 135 Số 3 - 2013
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