Person: YAMANKARADENİZ, NURETTİN
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YAMANKARADENİZ
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NURETTİN
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Publication Performance analysis of a solar-assisted dual-tank heat pump system for climatic conditions in Turkey(Vinca Inst Nuclear Sci, 2022-01-01) Yamankaradeniz, Nurettin; YAMANKARADENİZ, NURETTİN; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği Bölümü; AAA-1753-2021This study aimed to analyze the performance of a solar-assisted dual-tank heat pump system under climatic conditions in Turkey. This system and its components were modeled and simulated using transient system simulation software. The system was designed not only to supply domestic hot water for a restaurant, but also to heat it in winter and cool it in summer. The modeled system works on the principle that a water-to-water heat pump operating between dual tanks transfers the heat from the cold water tank (source side) to the hot water tank (load side). The hot water for both heating and domestic hot water is supplied from the hot water tank throughout all seasons, whereas, the cold water is supplied from the cold water tank for cooling the space in summer. A photovoltaic thermal collector was integrated into the cold water tank to support the source side of the heat pump and also to generate electricity for the system in winter, but was used only for producing electricity in summer. Analyses were carried out for five provinces (Istanbul, Ankara, Izmir, Hakkari, and Trabzon) located in five different regions of Turkey. According to the simulation results, the highest seasonal performance factor (2.65) was obtained for Izmir, whereas the lowest seasonal performance factor value (1.74) was obtained for Hakkari. The system worked 52% more efficiently in Izmir than in Hakkari. With the photovoltaic thermal collector, 17.68% of the total electrical energy consumption of the system was compensated for Izmir Province and 12.09% for Hakkari Province.Publication Minimization of thermal insulation thickness taking into account condensation on external walls(Sage, 2015-09-01) Yamankaradeniz, Nurettin; YAMANKARADENİZ, NURETTİN; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu; AAA-1753-2021Condensation occurs in the inner layers of construction materials at whatever point the partial pressure of water vapor diffuses and reaches its saturation pressure. Condensation, also called sweating, damages materials, reduces thermal resistance, and by increasing the total heat transfer coefficient, results in unwanted events such as increased heat loss. This study applied minimization of thermal insulation thickness with consideration given to condensation in the external walls. The calculations of heat and mass transfers in the structure elements are expressed in a graphical form. While there was an increase in the required thermal insulation thickness subsequent to an increase in the internal environment's temperature, relative humidity, and the external environment's relative humidity, the required thickness decreased with an increase in the external environment's temperature. The amount of water vapor transferred varied with internal or external conditions and the thickness of the insulation. A change in the vapor diffusion resistance of the insulation material can increase the risk of condensation on the internal or external surfaces of the insulation.Publication Exergy and exergoeconomic analyses of an orc-assisted vapour compression refrigeration cycle(Inderscience Enterprises Ltd, 2022-01-01) Yamankaradeniz, Nurettin; YAMANKARADENİZ, NURETTİN; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği Bölümü.In this study, the thermodynamic performance of a vapour compression refrigeration cycle (VCRC) in which an organic Rankine cycle (ORC) has integrated and that generates electricity by utilising a geothermal source is investigated. The system's energy and exergy performance has evaluated by using various refrigerants used in the ORC system, depending on the evaporator (ORC) temperature (70 degrees C-120 degrees C), and an exergoeconomic analysis has performed to determine optimum operating conditions. As a function of the refrigerant and evaporator temperature, the coefficient of performance (COPsys) of the integrated system has varied between 0.55 and 1.01, whereas the exergy efficiency has varied between 14.20% and 20.16%. The unit exergy cost of the cooled air has been determined as 27.22 USD/GJ under the optimum operating conditions.Publication Perceived safety culture and occupational risk factors among women in metal industries: A study in Turkey(Elsevier, 2015-01-01) Karwowski, W; Schmorrow, D; AKALP, HÜSRE GİZEM; Aytaç, Serpil; AYTAÇ, SEVİNÇ SERPİL; YAMANKARADENİZ, NURETTİN; Gökçe, Ahmet; Çankaya, Oğuzhan; ÇANKAYA, OĞUZHAN; Tüfekçi, Ulviye; TÜFEKÇİ YAMAN, ÜLVİYE; Ahram, T; Bursa Uludağ Üniversitesi/Ziraat Fakültesi; Ahram, T; Karwowski, W; Schmorrow, D; 0000-0003-4895-8958; AAA-1753-2021; O-9218-2019; I-7814-2019; AAK-6269-2021; AAK-4195-2021Although work provides many economic and other benefits, a wide array of workplace hazards also present risks to the health and safety of people at work. These include but are not limited to, "chemicals, biological agents, physical factors, ergonomic conditions, allergens, a complex network of safety risks," and a broad range of psychosocial risk factors. Occupational risk factors are those factors which directly or indirectly influence the health and performance of the workers. There are different risk factors associated to the working people's health within the given environment of the workplace. Participation of women at work is ensured by the laps of globalization. When we look into the role of women in today's world, women are employed in every industry and institute and hold nearly every kind of jobs. Present study aims at understanding the association between perceived occupational risk factors, safety culture and psycho-social health of working women in metal industries in Turkey. In this study, researchers try to highlight the importance of the issue in the context of Turkey and more specifically working women in metal industries. For the present study, 1750 working women were sampled from metal industries through simple random sampling by using sample size determinant formula in Turkey. The results showed that there is a positive association among perceived occupational risk factors, safety culture and Perception of safety awareness. The negative directional relation is observed between the Fatalism perception and awareness of safety and health of working women.Publication Led junction and heatsink number calculation with computational fluids dynamic (CFD)(Türk Isı Bilimleri Teknolojisi, 2015-01-01) Sökmen, K. Furkan; Pulat, Erhan; Yamankaradeniz, Nurettin; Coşkun, Salih; PULAT, ERHAN; YAMANKARADENİZ, NURETTİN; COŞKUN, SALİH; AAA-1753-2021; DLL-8342-2022; CMA-0559-2022A LED (Light Emmitting Diode) is an optoelectronic component which includes active layer among N and P type semiconductor products like a sandwich and electrical taps. Since 1995 LED is used in automotive sector. On this application, 0.5-0.75-1-1.25 W powered a typical car head light LED's junction temperature (T-j) rates with HAD resolutions at 25, 50, 80 degrees C and heat transmission rates are calculated. The winglet numbers and types, optimum winglet gaps were found out with macro according to evidences. The geometric model of LED was designed by CATIA V5 R19 software. It is divided into its components with ICEM CFD and its temperature analysis is done via ANSYS CFX 14. Its airflow is assumed as in constant regime, laminar and solid. Thermo physical features of the weather's changes related to heat, buoyancy and radiation effects are taken into consideration. Heat transmission rate on circuit and temperature rates are calculated and compared with the literature rates. Appropriate fin design developed with the help of program developed and despite the increasing ambient temperature, junction temperatures taken appropriate values. Optimum fin interval was found to be an important parameter in the design of heat sinks. LED should be located where the ambient temperature is low in headlamp for LED life and performance to be expected level.