Person: COŞKUN, SALİH
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COŞKUN
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SALİH
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Publication Numerical and experimental investigation of energy efficiency by applying phase change material to open vertical type refrigerated display cabinet(Gazi Univ, Fac Engineering Architecture, 2023-01-01) Sökmen, Furkan; Balkan, Cağrı; PULAT, ERHAN; Çelik, Ayse Burcu; Pulat, Erhan; COŞKUN, SALİH; Coşkun, Salih; Mühendislik Fakültesi; Makine Mühendisliği BölümüIn this study, phase change material (PCM) was applied to increase the energy efficiency of an open vertical type refrigerated display cabinet (OVRDC) with a width of 2500 mm, a height of 2059 mm, and a depth of 920 mm. First of all, tests were carried out on traditional OVRDC without PCM and then on OVRDC with PCM in a test room designed according to TS EN ISO 23953-2 standard. For both designs, distribution of cold air in the OVRDC, product temperatures on shelves, compressor on-off period, defrost times and energy consumption values were examined. The test data has been validated using by the computational fluid dynamics method. According to the results, it has been observed that the OVRDC with PCM in the specified cabinet sizes reduced total refrigerated electrical energy consumption by 5.1% compared to the conventional cabinets.Publication Examination of flat plate collector solar hot water system for ankara province in Turkiye with trnsys software(Gazi Univ, 2022-11-10) Seyhan, Aslıhan Kurnuç; Uzun, Sinem; Coşkun, Salih; COŞKUN, SALİH; Ziraat FakültesiA domestic solar water heating system using a flat plate collector is modeled for the domestic hot water requirement of a residential unit in Ankara, Turkey. The necessary design parameters were determined and the analysis was carried out using the TRNSYS simulation program. In the modeled system, the domestic water temperature was determined as 55 degrees C and water withdrawals were carried out at different flow rates during the day according to the usage intensity. The water withdrawal rates were determined as 80 kg/h between 07.00-09.00, 100 kg/h between 12.00-13.00 and 50 kg/h between 17.00-22.00. According to the results obtained, the designed system was able to meet the hot water need in summer and winter months by using solar energy through auxiliary heaters. While the collector efficiency reached its highest value with 40% in September, it reached the lowest efficiency value with 8% in December.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.Publication Exergy analysis of banana drying process via a closed-loop air source heat pump system(Taylor & Francis Inc, 2022-09-14) Tunçkal, Cüneyt; Yüksel, Ahmet; Coşkun, Salih; COŞKUN, SALİH; Teknik Bilimler Meslek Yüksekokulu; İklimlendirme ve Soğutma Programı; CMA-0559-2022In this study, an air source heat pump drying system with an external condenser circuit connected in series was developed. The system was designed to enable the external condenser to be activated serially with the internal one via the solenoid valves controlled by the digital thermostat when the drying temperature of the cabinet reaches the desired level. Temperature control of the drying chamber was achieved by activating the external condenser along with the internal condenser. Exergy analysis was conducted for the process of drying banana slices via a closed-loop air source heat pump dryer (HPD) at various drying temperatures. Exergy efficiencies and losses for the HPD system were calculated. As a result, the exergy efficiency of the dryer was calculated to be between 75.93% and 80.95%, while the exergy efficiencies of the system and heat pump were found to range from 7 to 13.07%. Moreover, the expansion valve was found to have the highest exergy efficiency with 93.32%. The highest exergy losses were also found in the compressor and condenser with 0.557 kW and 0.366 kW, respectively.Publication Examination of flat plate collector solar hot water system for Ankara province in Turkiye with trnsys software(Gazi Univ, 2022-12-01) Seyhan, Aslihan Kurnuç; Uzun, Sinem; Coskun, Salih; COŞKUN, SALİH; Ziraat FakültesiA domestic solar water heating system using a flat plate collector is modeled for the domestic hot water requirement of a residential unit in Ankara, Turkey. The necessary design parameters were determined and the analysis was carried out using the TRNSYS simulation program. In the modeled system, the domestic water temperature was determined as 55 degrees C and water withdrawals were carried out at different flow rates during the day according to the usage intensity. The water withdrawal rates were determined as 80 kg/h between 07.00-09.00, 100 kg/h between 12.00-13.00 and 50 kg/h between 17.00-22.00. According to the results obtained, the designed system was able to meet the hot water need in summer and winter months by using solar energy through auxiliary heaters. While the collector efficiency reached its highest value with 40% in September, it reached the lowest efficiency value with 8% in December.Publication Performance analysis of a solar-assisted ground source heat pump system in climatic conditions of Turkey(Vinca Inst Nuclear Sci, 2020-01-01) Coşkun, Salih; COŞKUN, SALİH; Elektrik ve Enerji Bölümü; Teknik Bilimler Meslek Yüksekokulu; CMA-0559-2022In order to contribute to widespread use of RES in Turkey, a solar-assisted ground source heat pump system was modeled using TRNSYS software and simulated for heating and supplying daily hot water to meet the needs of a restaurant in five sample provinces having different climatic conditions. During the simulation, the dining room temperature of the restaurant was kept constant at 22 degrees C during the winter season and a total of 300 Lph of water (55 degrees C) was used for 15 minutes four times a day. According to the simulation results, power consumption rates in the solar-assisted ground source heat pump system were determined as about 60% for the heat pump, 16% for heaters, 14% for the ground pump and 8% for fans and other pumps. The highest power consumption, as expected, was obtained for Hakkari Province (6723 kW) in the Eastern Anatolia region, which has a cold climate, while the lowest power consumption was obtained for Izmir Province (2822 kW) in the Aegean region, which has mild climatic conditions. The lowest seasonal performance factor and solar factor values were calculated as 2.27 and 32% for Hakkari and the highest as 2.71 and 56% for Izmir; respectively.