Ali Kemal Yakut

Energy and exergy analyses of vacuum drying process of pine timbers

In this study, an experimental system for the vacuum drying of timbers is designed. Experiments in the different temperature, pressure and the residence time in vacuum are carried out. The drying experiments are conducted at three different drying temperatures varied between 40°C and 60°C. The drying experiments are conducted at three different pressures varied between 60 kPa and 80 kPa. The residence time in vacuum is varied between 5 min and 15 min. In addition, Programmable Logic Controller (PLC) system to drying system is added. Energy and exergy analyses of vacuum drying process of pine timbers are carried out.

Theoretical and Experimental Analysis of a Salt Gradient Solar Pond with Insulated and Reflective Covers

Abstract In this study, a salt gradient solar pond having a surface area of 3.5 × 3.5 m2 and depth of 2 m has been built for supplying hot water to a leather workshop on the campus area of Vocational College of Isparta/Yalvaç. A cover system was used on the surface of the pond to reduce the thermal losses from the top to air and to increase the thermal efficiency of the pond. Such an arrangement is used for the very first time. The system is composed of two covers that can be rotated between 0 and 180 degrees by a controlled electric motor and has insulation and reflection properties, i.e., the covers function as insulators when closed and as reflectors when opened. The ponds thermal analysis has been carried out theoretically and experimentally for different operating conditions. Results obtained from this study show that salt gradient solar ponds can be used as a source of warm water required at the leather workshop and for suitable domestic applications. The covers were effective both for reducing the night thermal losses and for increasing the daytime performance, although the former effect is negligible.

Energetic and exergetic performance investigation of a cement facility for clinker production

In this study, the energetic and exergetic analyses of a cement plant for clinker production are investigated. The exergy destruction rate, energy and exergy efficiency of process components are presented by using the thermodynamic balance equations. The energetic and exergetic efficiencies of cement plant are calculated as 60.78%, and 46.11%, respectively. The rotary kiln, raw mill and cooler component have the maximum exergy destruction rate among the other process components. The exergy efficiency of rotary kiln, raw mill and cooler component are calculated as 57.36%, 33.52% and 49.46%, respectively. Also, to analyse the cement plant performance more comprehensively, the parametric studies are conducted to determine the impacts of different design variables, such as rotary kiln temperature and raw material mass flow rate, and feedstock coal chemical properties and varying of ambient temperature on the energy efficiency, exergy efficiency and exergy destruction rate of plant components.

Application of an Automatic Plant Irrigation System Based Arduino Microcontroller Using Solar Energy

In this system, plants’ optimum water need level is controlled by Ardiuno Uno Microcontroller. With the help of the buttons on the Lcd Shields, the plant species are chosen and after the humidity level is entered, it is controlled by Ardiuno Uno Microcontroller. When the humidity level of the earth decreases, Ardiuno Uno Microcontroller sends data for irrigation the plant and takes photo of it with Raspberry Pi before irrigation. The e-mail which contains necessary datum and photos is sent to related person. When the irrigation of the plants reaches the chosen humidity level, Ardiuno Uno Microcontroller stops irrigation and Raspberry Pi sends photos of the plant as an e-mail to the related person again after irrigation. The energy of this system is provided by the battery charging.

Thermodynamic analysis and assessment of space heating with ground–source heat pump for sustainable future

In this paper, the thermodynamic modelling of exergy loss, exergy efficiency, exergy destruction rate, environmental destruction coefficient, improvement potential, exergy destruction factor, relative irreversibility, productivity lack and exergetic factor of ground source heat pump (GSHP) system are investigated. The results show that these exergy indexes should be used integratively. Compressor has the maximum exergy destruction rate, followed by the condenser and ground heat exchanger. Exergy efficiencies are obtained as 54.54% and 38.52% for the GSHP unit and whole system, respectively. Related parametric studies concerning about exergy destruction rate and exergy efficiency of the system components are carried out at different ambient temperatures.