Browsing by Author "Ceviz, M.A."

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Effects of Secondary Fluid Flow Rate on Cooling Performance of Vapor Compression Systems
(Gumushane University, 2022) Afshari, F.; Çiloğlu, D.; Ceviz, M.A.; Ceylan, M.
The vapor compression cooling devices operate on the same principle as heat pumps. In these types of machines thermal energy is transferred from the cold environment to the warmer side using provided power by the compressor. In this study, the effect of air flow rate on the cooling performance of vapor compression cooling devices has been investigated by simulating a designed system in AVL CRUISE™ M program. The simulated model is air-to-air cooling machine and refrigerant R134a was used as circulated gas inside the system. COP value of the system has been calculated in different working conditions and obtained results have been fully discussed. Accordingly, enthalpy variation in every element of the heat pump has been calculated in different working conditions and discussed on P-h diagram. This study presents a simulation method that is a practical solution method in the field of heat pumps, cooling machines and refrigerators which can be considered before installing device in order to have a proper prediction of the system performance. © 2022, Gumushane University. All rights reserved.
Experimental Analysis of the Performance and Noise Interactions of Heat Pipe Cooling Systems Applied to Electronic Components
(Gumushane University, 2025) Mandev, E.; Ceylan, M.; Ceviz, M.A.
This study experimentally investigates the thermal performance and noise interactions of heat pipe cooling systems used in electronic components. In the experimental setup, temperature distribution, air flow characteristics and acoustic effects were analyzed under different heat loads and fan speeds using a heat pipe and forced convection mechanism. The results show that increasing fan speed enhances heat dissipation efficiency but also raises noise levels. Thermal imaging confirms that higher fan speeds lead to a more uniform temperature distribution across the heat pipe. At lower fan speeds, temperature rise is more pronounced, while at higher speeds, cooling efficiency significantly improves. However, noise measurements indicate that increased fan speed negatively impacts acoustic comfort. This study provides essential data for optimizing both the thermal and acoustic performance of cooling systems used in electronic components. The findings offer valuable insights into the design of high-efficiency and low-noise thermal management systems, contributing to the development of more effective cooling strategies for modern electronic devices. In the experiments, the heater power ranged between 20–40 W while fan power varied from 0.25 to 1.30 W. The maximum source temperature was reduced from about 85 °C to 42 °C, and noise levels were measured between 55 and 75 dB. © 2025, Gumushane University. All rights reserved.
Experimental and Numerical Study on Solar Energy Storage in Black-Covered Sunspace Using Water-Filled Tin Cans
(Begell House Inc., 2023) Afshari, F.; Mandev, E.; Muratçobanoğlu, B.; Celik, A.; Ceviz, M.A.
An experimental and numerical study was carried to store solar energy in a sunspace room for energy saving in cold regions by using water-filled tin cans. The energy collected in the water during the sunbathing hours is transferred to the environment in the evening when the ambient air temperature suddenly drops. Also, the walls were covered with black material in the sunspace area to absorb maximum solar energy and then the heating performance was investigated. ANSYS Fluent software (2022 R1 version) as a computational fluid dynamics (CFD) program was applied to simulate the sunspace domain in analyses. The results revealed that, while there was a sudden drop in temperature in the ambient air after sunset, it was observed that the water temperatures in the tin cans decreased more slowly. This indicates that heat transfer from the tin cans to the ambient air occurs during the night times. The effect of black surface application was shown and the differences between indoor and outdoor temperatures were evaluated. While the average temperature difference between the indoor and outdoor environment during the sunshine period without the black surface was 4.67°C, this difference increased to 9.53°C when the black surface was applied. The highest energy efficiency was achieved with the usage of the black surface, reaching a notable 58.2%.