The present study is aimed at numerical investigation, by using conjugated heat transfer approach... more The present study is aimed at numerical investigation, by using conjugated heat transfer approach, of the effect of different types of rectangular fins (outer zigzag-inner zigzag-flat-outer zigzag (type B) and inner zigzag-flat-inner zigzag (type C)), which are mounted on a flat plate channel having three-dimensional rectangular cross section, on heat transfer enhancement in a plate fin heat exchanger. The numerical computations are performed by solving a steady, three-dimensional Navier−Stokes equation and an energy equation by using the FLUENT software program. Air is taken as a working fluid. The study is carried out at Re = 400, at the inlet temperatures and velocities of cold and hot air fixed at 300 K, 600 K and 1.338 m/s, 0.69 m/s, respectively. The results show that the heat transfer is increased by 9 percent at the exit of channel with the fin type C, when compared to a channel without a fin with counterflow. The effect exerted on heat transfer enhancement by different values of the Reynolds number and fin heights, and also by temperature distributions on the hot and cold fluid sides of the channel surface are investigated in the case of parallel flow and counterflow.
Keywords: plate heat exchanger, numerical heat transfer, fin
Original scientific paper In the present study, heat transfer structures were investigated for th... more Original scientific paper In the present study, heat transfer structures were investigated for thermal bridges on both intermediate floor beamed wall block and balcony extension intermediate floor beamed wall. Temperature and heat flux contours were obtained for all models in the case of internal and external insulation cases with different insulation thicknesses (S i = 3 cm, 5 cm and 7 cm). Results showed that high heat transfer rates were obtained in the region of heat bridges for all building models. However the heat transfer rate did not decrease on the heat bridge region in the case of internal insulation. The most appropriate insulation model was the external insulation case and it was also obviously determined that heat transfer rate decreased with increments of insulation thickness.
The present study is aimed at numerical investigation, by using conjugated heat transfer approach... more The present study is aimed at numerical investigation, by using conjugated heat transfer approach, of the effect of different types of rectangular fins (outer zigzag-inner zigzag-flat-outer zigzag (type B) and inner zigzag-flat-inner zigzag (type C)), which are mounted on a flat plate channel having three-dimensional rectangular cross section, on heat transfer enhancement in a plate fin heat exchanger. The numerical computations are performed by solving a steady, three-dimensional Navier−Stokes equation and an energy equation by using the FLUENT software program. Air is taken as a working fluid. The study is carried out at Re = 400, at the inlet temperatures and velocities of cold and hot air fixed at 300 K, 600 K and 1.338 m/s, 0.69 m/s, respectively. The results show that the heat transfer is increased by 9 percent at the exit of channel with the fin type C, when compared to a channel without a fin with counterflow. The effect exerted on heat transfer enhancement by different values of the Reynolds number and fin heights, and also by temperature distributions on the hot and cold fluid sides of the channel surface are investigated in the case of parallel flow and counterflow. Keywords: plate heat exchanger, numerical heat transfer, fin
In the present study, the effects of different types thermal bridges formed by beams for floor-wa... more In the present study, the effects of different types thermal bridges formed by beams for floor-wall junctions in reinforced concrete structures, with and without balconies , and the optimum configuration of the insulation layers to avoid heat loss were investigated as numerically. Both insulation between the walls and internal insulation was selected for floor-wall junctions and internal insulation was used for floor-wall junctions with balcony. Fluent package program was used to solve the temperature domain numerically. Results showed that high heat transfer rates were obtained in the region of thermal bridges for all building models. It was also obviously obtained that heat transfer rate decreased with making insulation on the beam surfaces.
In this study, an exergoeconomic analysis of condenser type parallel flow heat exchangers is pres... more In this study, an exergoeconomic analysis of condenser type parallel flow heat exchangers is presented. Exergy losses of the heat exchanger and investment and operation expenses related to this are determined with functions of steam mass flow rate and water exit temperature ...
Numerical simulation of flow and heat transfer in two adjacent channels is conducted with one of ... more Numerical simulation of flow and heat transfer in two adjacent channels is conducted with one of the channels partially blocked. This system simulates typical channels of a material testing reactor. The blockage is assumed due to the buckling of one of the channel plates inward along its width. The blockage ratio considered in this work is defined as the ratio between the cross-sectional area of the blocked and the unblocked channel. In this work, we consider a blockage ratio of approximately 40%. However, the blockage is different along the width of the channel, ranging from 0% at the end of the channel to 90% in the middle. The channel walls are sandwiching volumetric heat sources that vary spatially as chopped cosine functions. Interesting patterns are highlighted and investigated. The reduction in the flow area of one channel results in the flow redistributing among the two channels according to the changes in their hydraulic conductivities. The results of the numerical simulations show that the maximum wall temperature in the blocked channel is well below the boiling temperature at the operating pressure.
Original scientific paper In the present study, heat transfer structures were investigated for th... more Original scientific paper In the present study, heat transfer structures were investigated for thermal bridges on both intermediate floor beamed wall block and balcony extension intermediate floor beamed wall. Temperature and heat flux contours were obtained for all models in the case of internal and external insulation cases with different insulation thicknesses (S i = 3 cm, 5 cm and 7 cm). Results showed that high heat transfer rates were obtained in the region of heat bridges for all building models. However the heat transfer rate did not decrease on the heat bridge region in the case of internal insulation. The most appropriate insulation model was the external insulation case and it was also obviously determined that heat transfer rate decreased with increments of insulation thickness.
The present study is aimed at numerical investigation, by using conjugated heat transfer approach... more The present study is aimed at numerical investigation, by using conjugated heat transfer approach, of the effect of different types of rectangular fins (outer zigzag-inner zigzag-flat-outer zigzag (type B) and inner zigzag-flat-inner zigzag (type C)), which are mounted on a flat plate channel having three-dimensional rectangular cross section, on heat transfer enhancement in a plate fin heat exchanger. The numerical computations are performed by solving a steady, three-dimensional Navier−Stokes equation and an energy equation by using the FLUENT software program. Air is taken as a working fluid. The study is carried out at Re = 400, at the inlet temperatures and velocities of cold and hot air fixed at 300 K, 600 K and 1.338 m/s, 0.69 m/s, respectively. The results show that the heat transfer is increased by 9 percent at the exit of channel with the fin type C, when compared to a channel without a fin with counterflow. The effect exerted on heat transfer enhancement by different values of the Reynolds number and fin heights, and also by temperature distributions on the hot and cold fluid sides of the channel surface are investigated in the case of parallel flow and counterflow.
Keywords: plate heat exchanger, numerical heat transfer, fin
Original scientific paper In the present study, heat transfer structures were investigated for th... more Original scientific paper In the present study, heat transfer structures were investigated for thermal bridges on both intermediate floor beamed wall block and balcony extension intermediate floor beamed wall. Temperature and heat flux contours were obtained for all models in the case of internal and external insulation cases with different insulation thicknesses (S i = 3 cm, 5 cm and 7 cm). Results showed that high heat transfer rates were obtained in the region of heat bridges for all building models. However the heat transfer rate did not decrease on the heat bridge region in the case of internal insulation. The most appropriate insulation model was the external insulation case and it was also obviously determined that heat transfer rate decreased with increments of insulation thickness.
The present study is aimed at numerical investigation, by using conjugated heat transfer approach... more The present study is aimed at numerical investigation, by using conjugated heat transfer approach, of the effect of different types of rectangular fins (outer zigzag-inner zigzag-flat-outer zigzag (type B) and inner zigzag-flat-inner zigzag (type C)), which are mounted on a flat plate channel having three-dimensional rectangular cross section, on heat transfer enhancement in a plate fin heat exchanger. The numerical computations are performed by solving a steady, three-dimensional Navier−Stokes equation and an energy equation by using the FLUENT software program. Air is taken as a working fluid. The study is carried out at Re = 400, at the inlet temperatures and velocities of cold and hot air fixed at 300 K, 600 K and 1.338 m/s, 0.69 m/s, respectively. The results show that the heat transfer is increased by 9 percent at the exit of channel with the fin type C, when compared to a channel without a fin with counterflow. The effect exerted on heat transfer enhancement by different values of the Reynolds number and fin heights, and also by temperature distributions on the hot and cold fluid sides of the channel surface are investigated in the case of parallel flow and counterflow. Keywords: plate heat exchanger, numerical heat transfer, fin
In the present study, the effects of different types thermal bridges formed by beams for floor-wa... more In the present study, the effects of different types thermal bridges formed by beams for floor-wall junctions in reinforced concrete structures, with and without balconies , and the optimum configuration of the insulation layers to avoid heat loss were investigated as numerically. Both insulation between the walls and internal insulation was selected for floor-wall junctions and internal insulation was used for floor-wall junctions with balcony. Fluent package program was used to solve the temperature domain numerically. Results showed that high heat transfer rates were obtained in the region of thermal bridges for all building models. It was also obviously obtained that heat transfer rate decreased with making insulation on the beam surfaces.
In this study, an exergoeconomic analysis of condenser type parallel flow heat exchangers is pres... more In this study, an exergoeconomic analysis of condenser type parallel flow heat exchangers is presented. Exergy losses of the heat exchanger and investment and operation expenses related to this are determined with functions of steam mass flow rate and water exit temperature ...
Numerical simulation of flow and heat transfer in two adjacent channels is conducted with one of ... more Numerical simulation of flow and heat transfer in two adjacent channels is conducted with one of the channels partially blocked. This system simulates typical channels of a material testing reactor. The blockage is assumed due to the buckling of one of the channel plates inward along its width. The blockage ratio considered in this work is defined as the ratio between the cross-sectional area of the blocked and the unblocked channel. In this work, we consider a blockage ratio of approximately 40%. However, the blockage is different along the width of the channel, ranging from 0% at the end of the channel to 90% in the middle. The channel walls are sandwiching volumetric heat sources that vary spatially as chopped cosine functions. Interesting patterns are highlighted and investigated. The reduction in the flow area of one channel results in the flow redistributing among the two channels according to the changes in their hydraulic conductivities. The results of the numerical simulations show that the maximum wall temperature in the blocked channel is well below the boiling temperature at the operating pressure.
Original scientific paper In the present study, heat transfer structures were investigated for th... more Original scientific paper In the present study, heat transfer structures were investigated for thermal bridges on both intermediate floor beamed wall block and balcony extension intermediate floor beamed wall. Temperature and heat flux contours were obtained for all models in the case of internal and external insulation cases with different insulation thicknesses (S i = 3 cm, 5 cm and 7 cm). Results showed that high heat transfer rates were obtained in the region of heat bridges for all building models. However the heat transfer rate did not decrease on the heat bridge region in the case of internal insulation. The most appropriate insulation model was the external insulation case and it was also obviously determined that heat transfer rate decreased with increments of insulation thickness.
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Papers by Ertan Buyruk
Keywords: plate heat exchanger, numerical heat transfer, fin
Keywords: plate heat exchanger, numerical heat transfer, fin