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Showing papers in "Applied Thermal Engineering in 2011"


Journal ArticleDOI
TL;DR: In this paper, a sizing model of the ORC is proposed, capable of predicting the cycle performance with different working fluids and different components sizes, based on the thermodynamic and economic optimization of a small scale ORC in waste heat recovery application.

613 citations


Journal ArticleDOI
TL;DR: In this article, high-temperature thermal storage in a packed bed of rocks is considered for air-based concentrated solar power plants, and the unsteady 1D two-phase energy conservation equations are formulated for combined convection and conduction heat transfer, and solved numerically for charging/discharging cycles.

317 citations


Journal ArticleDOI
TL;DR: In this article, Qiu and Guoquan proposed a method to improve the quality of the data collected by the data collection system. Tel: +44 115 8467132; +44 11 951 3159.

294 citations


Journal ArticleDOI
TL;DR: In this paper, forced convective heat transfer in a water based nanofluid has experimentally been compared to that of pure water in an automobile radiator, and the results showed that the water can be changed in the range of 2-5 l/min to have the fully turbulent regime.

291 citations


Journal ArticleDOI
TL;DR: In this article, the authors present an experimental study on heat transfer characteristics of PCMs embedded in open-cell metal foams and expanded graphite, respectively, and show that the addition of porous materials, either opencell metal foam or expandable graphite can enhance the heat transfer rate of PCM.

285 citations


Journal ArticleDOI
TL;DR: In this paper, a theoretical framework for the energy analysis and exergy analysis of the solar power tower system using molten salt as the heat transfer fluid was presented to identify the causes and locations of the thermodynamic imperfection.

260 citations


Journal ArticleDOI
TL;DR: In this paper, the effects of various parameters such as power levels, number of fins, fin height and fin thickness on the performance of a phase change material (PCM)-based heat sink were investigated.

235 citations


Journal ArticleDOI
TL;DR: In this article, the influence of compression ratio and injection parameters such as injection timing (IT) and injection pressure (IP) on the performance and emissions of a DI diesel engine using biodiesel (%5, 20, 50%, and 100%) blended-diesel fuel.

219 citations


Journal ArticleDOI
TL;DR: In this article, a plate and fin heat exchanger is considered and air, as an ideal gas, is defined in both sides of the heat exchange as the working fluid Several geometric variables within the logical constraints are considered as optimization parameters Two different objective functions including the total rate of heat transfer and the total annual cost of the system are defined.

217 citations


Journal ArticleDOI
TL;DR: In this paper, a photovoltaic/thermal (PV/T) solar air heater with a double pass configuration and vertical fins in the lower channel is investigated.

215 citations


Journal ArticleDOI
TL;DR: In this paper, a genetic algorithm (GA) from Matlab optimization toolbox was used to optimize a propane pre-cooled mixed refrigerant (C3-MR) LNG plant that was originally designed by Mortazavi et al.

Journal ArticleDOI
TL;DR: In this paper, the authors provided energy consumption data of a sample of 2570 retail food stores from a number of major retail food chains in the UK, covering all major store categories from convenience stores to hypermarkets.

Journal ArticleDOI
TL;DR: In this paper, an energy planning methodology is applied to several cases where use of smart energy storage system helps integration of energy flows, transformations and energy demand at the location of the energy end-use or close to it.

Journal ArticleDOI
TL;DR: In this article, a detailed analysis of an organic rankine cycle (ORC) heat recovery power plant using R134a as working fluid is presented, where mathematical models for the expander, evaporator, air cooled condenser and pump are developed to evaluate and optimize the plant performance, and the relationship between controlled variables (optimal relative working fluid mass flow rate, the optimal relative condenser fan airmass flow rate) and uncontrolled variables (the heat source temperature and the ambient dry bulb temperature) are near liner function for maximizing system net power generation and quadratic function

Journal ArticleDOI
TL;DR: In this article, the use of supercritical and transcritical carbon dioxide cycles for this application is proposed, and three different cycles are considered, the first two are stand-alone closed cycle gas turbines using carbon dioxide, the third proposal is a combined cycle that comprises a topping carbon dioxide gas turbine and a bottoming Organic Rankine Cycle.

Journal ArticleDOI
TL;DR: In this article, the role of heat transfer between the rock matrix and circulating fluid on economic hot water production from fractured geothermal systems is investigated and a numerical procedure is developed by coupling fluid flow with heat transfer.

Journal ArticleDOI
TL;DR: In this paper, the influence of compression ratio on the performance of a spark ignition engine fuelled by a blend of 78% gasoline-22% ethanol (E22) or hydrous ethanol(E100) was investigated.

Journal ArticleDOI
TL;DR: In this article, a comprehensive thermodynamic and exergoeconomic modeling of a Gas Turbine (GT) power plant is presented, where a multi-objective optimization is performed to find the best design variables.

Journal ArticleDOI
TL;DR: In this article, the state-of-the-art in thermal management materials for automotive ECU applications is reviewed, and it is shown that of the different materials currently available, the Al/SiC composites in particular have very good potential for automotive ECCU application.

Journal ArticleDOI
TL;DR: An overview of options and potential barriers and risks for reducing the energy consumption, peak demand, and emissions for seven key energy consuming residential products (refrigerator-freezers, dishwashers, clothes washers, dryers, electric ovens, gas ovens and microwave ovens) is presented in this article.

Journal ArticleDOI
TL;DR: In this article, the effect of geometric parameters on water flow and heat transfer characteristics in micro-channel heat sink with triangular reentrant cavities is numerically investigated, and the optimal geometric parameters are obtained in principle.

Journal ArticleDOI
TL;DR: In this article, the authors presented a validated TRNSYS model for forced circulation solar water heating systems used in temperate climates, which consisted of two flat plate collectors and a heat pipe evacuated tube collector.

Journal ArticleDOI
TL;DR: In this paper, a double layer phase change material (PCM) floor is put forward to store heat or cold energy in the off-peak period and release them in the peak period during heating or cooling.

Journal ArticleDOI
Meral Ozel1
TL;DR: In this article, thermal performance and optimum insulation thickness of building walls with different structure materials under dynamic thermal conditions were investigated for a south-facing wall and the climatic conditions of Elazig, Turkey.

Journal ArticleDOI
TL;DR: In this paper, a study of the heat transfer performance of liquid-cooled heat sinks with conventional and novel micro-channel flow field configurations for application in electronic devices, fuel cells, and concentrated solar cells is presented.

Journal ArticleDOI
TL;DR: In this paper, the effect of temperature differences on the fluid flow and heat transfer in the energy storage/release system is analyzed using a commercial computational fluid dynamics (CFD) package based on the finite volume method.

Journal ArticleDOI
TL;DR: In this paper, the authors demonstrate that the medium-or low-temperature solar heat can be used to generate power efficiently by integrating into conventional coal-fired power plants by using a regenerative Rankine cycle to pre-heat feedwater.

Journal ArticleDOI
TL;DR: In this paper, an empirical relationship between the gas turbine's ability to generate power when exposed to site ambient conditions, such as the ambient temperature, which differ from ISO conditions, was proposed.

Journal ArticleDOI
TL;DR: In this paper, a comparative test rig had been set up to measure and analyze the performance of hybrid photovoltaic and thermal (PV/T) system, and the experimental results showed that the daily thermal efficiency of PV/T system was about 40%, which was about 75% of that for a traditional solar thermosiphon system.

Journal ArticleDOI
TL;DR: In this paper, the effects of ethanol-gasoline blended fuel on cold-start emissions of an SI engine were studied, where the ECU controls fuel injection rate based on cooling water temperature and intake air temperature, which were carefully controlled during the experiment.