Haydar Kucuk

A Review on Thin-Layer Drying-Curve Equations

This paper presents a comprehensive review of thin-layer drying-curve models available in the literature and their comparisons for single-layer drying applications from 2003 to 2013. In this regard, a total of 67 models are selected and classified under 28 performance assessment criteria for comparison purposes. These models are then evaluated by considering the following parameters: (1) product type; (2) pretreatment type; (3) drying parameters, such as temperature, air velocity, layer thickness, microwave power levels, amount of solar radiation, vacum pressure, frequency of sound wave, excitation amplitude, relative humidity, bed depth, product shape, pH, salt content, absolute pressure, etc.; and (4) drying method employed. Furthermore, the best models obtained are employed for product drying applications and compared for different drying methods, drying parameters, and dried products.

Progress in Sustainable Energy Technologies: Generating Renewable Energy

Comparative Study of Effect of Cloudiness/Haziness Factor on the Quality of Solar Radiation -- Investigation of a Renewable Energy-Based Integrated System for Baseload Power Generation -- Investigation of Organic Rankine Cycle Performance with Variable Mixture Composition -- Comparative Performance Assessment of Two Geothermal-Based Integrated Systems for Hydrogen Production -- Exergetic Optimization of Two Renewable Energy Based Tri-Generation Systems Using Genetic Algorithm -- Performance Evaluation of Integrated Energy Systems -- Performance Assessment of a Two–Stage Heat Pump–Drying System -- Comparative Assessment of Nuclear Based Hybrid Sulfur Cycle and High Temperature Steam Electrolysis Systems Using HEEP -- Thermodynamic Analysis of a Cycle Integrating a Solid-Oxide Fuel Cell and Micro Gas Turbine with Biomass Gasification -- Exergy Analysis of Scroll-Based Rankine Cycles with Various Working Fluids -- Thermochemical Energy Storage Systems: Design, Assessment and Parametric Study of Effects of Charging Temperature -- Thermodynamic Assessment of Seasonal Stratified Thermal Storage -- Recent Developments in Solar-Powered Micro CHP Systems -- Evaluation of Transient Behavior of a Single-Effect Absorption Chiller -- Combined Effect of Global Warming and Buildings Envelope on the Performance of Ground Source Heat Pump Systems -- Concentrated Solar Power: A Vision for Rajasthan -- Dynamic Exergy Analysis of a Solar Ejector Refrigeration System with Hot Water Storage Tank -- Combined Photovoltaic Solar Cell – Fuel Cell System: Powering a Dormitory Building -- Investigation of a Combined Air Source Heat Pump and Solar Thermal Heating System within a Low Energy Research Home -- A Solar Water Heater for Subzero Temperature Areas -- Modeling of the Heliostat Field in Central Receiver Systems for a Given Input Power -- Single Pass Solar Air Heater without Absorber -- An Alternative Energy Concept: A Solar Power Plant with a Short Diffuser -- Production of Renewable Hydrogen by Aqueous-Phase Reforming of Glycerol over Ni-Cu Catalysts Derived from Hydrotalcite Precursors -- Effects of Pyrolysis Conditions on Structural Ingredients and Functional Groups of Hybrid Poplar -- Contribution for Solar Mapping in Algeria -- Experimental and Theoretical Investigations of Performance of Psychometric Humidification and Dehumidification Solar Water Desalination System Coupled with an Evacuated Tube Solar Collector -- Optimal Siting of Offshore Wind Farms -- An Investigation into a Small Wind Turbine Blade Design -- Hydrogen Production by Reforming Clathrate Hydrates Using the In-Liquid Plasma Method -- Facilitation of Wind Energy Conversion System Selection as Distributed Generation in Household/Commercial and Agricultural Sectors; Case Study of Iran -- An Integrated Monitoring Framework for Geothermal Space-Heating Systems in Residential Buildings, Fort McMurray -- Characterization of Heat Transport Processes in Geothermal Systems -- The Prospects for Geothermal Application in Algeria -- Thermal Interactions of Vertical Ground Heat Exchangers for Varying Seasonal Heat Flux -- Environmentally Friendly Systems: Earth Heat Pump System with Vertical Pipes for Heat Extraction for Domestic Heating and Cooling -- Thermal Response Test Analysis for an Energy Pile in Ground-Source Heat Pump Systems -- Thermal Performance Comparison between Longitudinal and Lateral Hollow Plate Fin Heat Sinks -- Model-Based Analysis of Singapore’s Energy System -- Analysis of a Combined Power and Heating Thermodynamic System Driven by Low Temperature Heat Source -- A Comparative Life Cycle Assessment (LCA) of Compressed Natural Gas (CNG) and Diesel Powered Refuse Collection Vehicles (RCVS) -- Anaerobic Treatment and Biogas Production af Raw Leachate from Fresh Market Waste Composting by an Anaerobic Hybrid Reactor -- A First Experimental Survey on the Urban Heat Island in Padua (Italy) -- Microwave Enhanced Pyrolysis of Gumwood -- Improving Operating Efficiency of Installed Capacity in a Power and Water Cogeneration Plant -- Simulation, Modeling and Analysis of Water/Power Ratios for a Dual Purpose Water and Power Production Plant.

Entropy Generation of Hydrogen Flow in a Curved Annular Duct

The main objective of this study is to numerically investigate the entropy generation of both hydrodynamically and thermally fully developed laminar flow of hydrogen gas under various operating pressures and temperatures in the concentric curved annular ducts with rectangular cross section. In this regard, the solutions of discretized continuity, momentum and energy equations have been obtained using elliptic Fortran Program based on the SIMPLE algorithm. The solutions have been achieved for (1) Dean numbers ranging from 2.3 to 202.9, (2) Annulus dimension ratios of 5.5, (3) Operating pressures of 0.101325, 1, 10, 40, 70 and 100 MPa, (4) Core wall temperature of 50 and 80 °C, (5) Duct wall temperature of 25 °C. In this regard, overall entropy generation in the whole flow field has been analyzed in detail. Moreover, the effects of Dean number, operating pressure and core wall temperature on entropy generation arising from the flow and heat transfer have been investigated. Accordingly, it is concluded that the effect of volumetric entropy generation that is a result of fluid flow can be neglected as compared with volumetric entropy generation due to heat transfer. When Dean number, operating pressure and core wall temperature increase the total volumetric entropy generation goes up. Thus, it is expected that this study will contribute to develop the energy efficient-hydrogen gas heaters for practical applications including hydrogen exchangers, PEMFC applications, hydrogen gas turbines, chemical mixing processes and hydrogen gas dryers in hydrogen industry.

Exergy-Based Sustainability Indicators for a Single Layer Solar Drying Process

The main objective of this study is to develop the exergetic sustainability indicators for a single layer solar drying process of the shelled and unshelled pistachio samples. In this regard, the exergetic sustainability indicators such as exergetic efficiency, waste exergy ratio, exergy recoverability ratio, exergy destruction ratio, environmental impact factor, and exergetic sustainability index are defined and estimated by depending on the experimental data obtained from the single layer solar drying process. Accordingly, it is noticed that the rise of waste exergy ratio decreases the exergetic efficiency and exergetic sustainability index while increasing environmental impact factor.

Viscous dissipation effects on entropy generation in heated vertical parallel-plate channels for mixed convection

In this study, effect of viscous dissipation on entropy generation for fully developed incompressible laminar flow mixed convection in vertical parallel-plate channels with asymmetric and symmetric uniform heat fluxes was parametrically analysed. Analytical equations were derived by using continuum approach and perturbation method. A specific MATLAB code was created to solve the governing equations. The effects of Gr/Re, the Brinkman number, and the ratio of wall heat flux on the entropy generation are presented and discussed. It is concluded that viscous dissipation has a significant effect on the entropy generation for mixed convection in heated vertical parallel-plate channels. Entropy generation resulting from fluid friction goes up, however, entropy generation due to heat transfer decreases by increasing of viscous dissipation. Consequently, it can be said that, this study will contribute to literature in optimising the systems that operates under mixed convection conditions in the vertical parallel-plate configuration.

Environmental Friendly Food Smoking Technologies

This study deals with the development of the food smoking technologies for environmental friendly unit operations. Smoking process include some different unit operations such as salting, drying and smoking. In this regard, the last innovative studies on the smoking technologies first defined. Second, the main environmental characteristics of unit operations in smoking process are discussed. Third, some sustainable strategies for improving the smoking process and minimizing the environmental impact are developed. Finally, a case study, including the cold air assisted salting, drying and smoking of the food, is presented by considering some food quality and safety parameters. Finally, the results show that the best method reduced environmental impact is the low temperature assisted brining, drying and liquid smoking. In summary, the low temperature process assisted production techniques are potential techniques for food smoking industry in order to achieve better product quality, safety and reduced environmental impact.

Common Applications of Thin Layer Drying Curve Equations and Their Evaluation Criteria

In this study, thin layer drying curve equations commonly used in the literature between 2003 and 2013 are systematically discussed and evaluated in terms of their applications and selection for thin layer drying processes by considering the model evaluation criteria. As a result of this study, serious complications, confusions, and conflicts in the applications of thin layer drying curve equations and their evaluation criteria are noticed. Consequently, it is recommended that the drying curve equations should be applied in accordance with the forms commonly used in the literature. Also, it is determined that the following drying curve equations give the best results for thin layer drying processes which are the Midilli-Kucuk, Page, Logarithmic, Two-term, Wang and Singh, Approximation of diffusion, Modified Henderson and Pabis, Modified Page, Henderson and Pabis, Two-term exponential, and Verma et al.