Ahmet Kabul

Exergetic assessment of a rotary kiln for clinker production in cement industry

Cement industry is one of the most energy consuming sectors in the world. Through a cement plant, rotary kiln is the most energy intensive section that consumes the highest portion of the total energy, so it is getting very substantial to perform energy and exergy analyses for determining possible energy–saving options. In this study, thermodynamic assessment of the rotary kiln unit of a cement plant is carried. For the analysis, mass, energy and exergy balances of the rotary kiln are constituted and using actual plant data the performances of the rotary kiln are identified. The rotary kiln clinker capacity is 79 tons per hour. The energy and exergy efficiency of the unit is found to be 68% and 58.6%, respectively. At the end of the study, the results are compared with the other studies concerning with the same matter of different plants and available heat recovery possibilities are discussed.

Chapter 2.17 – Design, Energy and Exergy Analyses of Linear Fresnel Reflector

Abstract Lighting, heating, transport, industrial output: without energy we would have none of these essential day-to-day services without which we and our businesses cannot function. Renewable energy refers to natural energy resource (solar, wind, biogas, tidal, geothermal, etc.) alternatives to fossil and nuclear fuels. All renewable energy sources like solar, wind, geothermal, hydropower, and wave and tidal power are forms of sustainable energy. Solar energy is the most important part of the renewable energy resources such that it is an essential building block for our future global sustainable energy system. Solar energy technologies are divided into two groups: photovoltaic power systems and thermal power systems. The linear Fresnel reflector (LFR) is a thermal power system. The LFR collects the suns rays through reflective surfaces and then transfers the energy to the fluid in the receiver located at the focal point. The heated fluid is provided with thermal energy conversion thanks to the LFR. It is converted to electrical energy from the thermal energy generated by various transducer equipment. In this chapter, we researched design and performance analysis of LFR. System efficiency has been shown to vary with design and incoming radiation intensity.

Thermodynamic and thermoeconomic analysis of subcooled and superheated vapour compressed refrigeration system using R152A, R410A and R600A

In this study, thermodynamic and thermoeconomic analysis procedures are applied to a subcooled and superheated vapour compression refrigeration system for different refrigerants. By thermodynamic analysis, Coefficient of Performance (COP), irreversibilities and exergetic efficiencies of a theoretical refrigeration system are determined to evaluate the system performance. With the thermoeconomic analysis procedure, optimum working conditions such as condenser, evaporator, subcooling and superheating heat exchangers and temperatures are determined. A cost function is specified for the optimum conditions. The analyses are made for three refrigerants: R152A, R410A and R600A.