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    Experimental and computational design improvement assessment of a household toast grill
    (Elsevier, 2020) Gunes, Dogan; Kukrer, Ergin; Yildirim, Canberk
    Small kitchen appliances have become very popular with increasing needs. One of the most common household appliances is the toast grills. The grills are available in every home or restaurant. It is necessary to reach a high temperature for the operation of these grills. However, some contact surfaces should also be kept within a certain temperature range for safety. In this paper, development and assessment of some design changes to reduce the high temperature on the upper (contact) surface of the grill and the overall performance effect are studied. Compliance with EU small domestic appliances standard (SDA), which states conditions that could threaten user health, overheating and electrical accidents constitute the A13 standard. Compliance of the new design proposals are also reported in this paper. Laboratory tests at several locations of the grill and infrared examination are carried out to analyze the results of the proposed changes. Temperature drops of up to 20. are observed on the top cover surfaces with the application of insulation as part of the new design proposal. Savings obtained in accordance with Electrotechnical Commission (ICE) standards and heat and energy efficiency gain are reported. Computational model of the toast grill developed in this paper is found in line with experimental and infrared results. The model may be used to improve new designs for further studies.
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    Liquid Level Sensor in Automotive Design
    (Iaria Xps Press, 2011) Erdem, Mehmet Emre; Gunes, Dogan
    New materials and technological developments in electronics and computers have changed all of the industries, as well as the world itself. These technological advancements have evolved automotive industry by redefining the concepts like: performance, efficiency, fuel consumption, driving dynamics, ergonomics etc. to a level far beyond expected. In this paper, the development stages; including the finite element analysis of the current sensors, using finite element analysis to design a new sensor, is elaborated. The new model designed in this study is computationally validated for production purposes and is planned to be experimentally tested. Also, in this paper a novel liquid level sensing device development strategy is presented in detail.
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    Performance Rating and Flow Analysis of an Experimental Airborne Drag-Type VAWT Employing Rotating Mesh
    (Mdpi, 2024) Gunes, Dogan; Kukrer, Ergin
    This paper presents the results of a performance analysis conducted on an experimental airborne vertical axis wind turbine (VAWT), specifically focusing on the MAGENN Air Rotor System (MARS) project. During its development phase, the company claimed that MARS could generate a power output of 100 kW under wind velocities of 12 m/s. However, no further information or numerical models supporting this claim were found in the literature. Extending our prior conference work, the main objective of our study is to assess the accuracy of the stated rated power output and to develop a comprehensive numerical model to analyze the airflow dynamics around this unique airborne rotor configuration. The innovative design of the solid model, resembling yacht sails, was developed using images in the related web pages and literature, announcing the power coefficient (Cp) as 0.21. In this study, results cover 12 m/s wind and flat terrain wind velocities (3, 5, 6, and 9 m/s) with varying rotational velocities. Through meticulous calculations for the atypical blade design, optimal rotational velocities and an expected Tip Speed Ratio (TSR) of around 1.0 were determined. Introducing the Centroid Speed Ratio (CSR), which is the ratio of the sail blade centroid and the superficial wind velocities for varied wind speeds, the findings indicate an average power generation potential of 90 kW at 1.4 rad/s for 12 m/s and approximately 16 kW at a 300 m altitude for a 6 m/s wind velocity.