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    Hydrothermal behavior of hybrid magnetite nanofluid flowing in a pipe under bi-directional magnetic field with different wave types
    (Elsevier Ltd, 2022) Tekir, M.; Gedik, E.; Arslan, K.; Kadir, Pazarlioglu, H.; Aksu, B.; Taskesen, E.
    This experiment setup has been developed to elucidate the effect of different wave types (sinusoidal, triangle, square) of bi-directional magnetic field on hydrothermal characteristics of hybrid magnetite nanofluid flowing through a tube. The bi-directional magnetic field is not a novel method among active methods of heat transfer enhancements, yet the effects of different wave types have not been researched so far. In this study, the effects of different wave types of alternating magnetic fields with various frequencies (f) (2, 5, and 15 Hz) on flow and heat transfer characteristics of Fe3O4-Cu/Water hybrid magnetic nanofluid flow have been investigated experimentally. The major findings have been discussed for different combinations of hybrid magnetite nanofluid, types of waves, values of Reynolds number (Re), and f. The hydrothermal characteristics and their effects on usability in the industry with high efficiency have been established in terms of average Nusselt number (Nu), average friction factor (f), and Performance Evaluation Criteria (PEC). It is concluded that the use of triangle wave type with f = 15 Hz with 2% Fe3O4/water shows the highest enhancement in f by 500% compared to distilled water (DW) at Re = 994 while the use of square wave type with f = 5 Hz using the same Re and nanofluid presents the highest increase in Nu by 15.3% compared with DW. Above all, the triangular wave type is determined as an optimum wave type for f = 15 Hz while the sinus and square wave types are realized as optimum ones for f = 5 Hz. © 2022 Elsevier Ltd
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    Thermoeconomic analysis of a water to water heat pump under different condenser and evaporator conditions
    (2019) Aksu, B.; Uysal, Cüneyt; Kurt, Hüseyin
    A thermoeconomic analysis of a water to water heat pump are performed under different condenser andevaporator conditions. Experiments are realized for different volumetric inlet temperatures of 14.4, 17 and 19C? and different volumetric flow rates of 50, 100, 150 lt/h for condenser cooling water. Same inlet temperatureswith condenser cooling water are used for evaporator water inlet, while constant volumetric flow rate of 100 lt/his used for each case. Modified Productive Structure Analysis (MOPSA) is used for thermoeconomic analysis. Itis found that increases in inlet temperature and in volumetric flow rate cause to decrease in both the unit cost ofheat delivered ( H C ) and the unit cost of entropy generation ( S C ). As a result, in the case of inT =14.4 C? and ?= 50 lt/h, H C and S C values are obtained to be 0.0489 $/kWh and 0.0221 $/kWh, respectively, while HC andS C values are obtained to be 0.0385 $/kWh and 0.0175 $/kWh for inT =19 C? and ? = 150 lt/h, respectively.
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    THERMOECONOMIC ANALYSIS OF A WATER TO WATER HEAT PUMP UNDER DIFFERENT CONDENSER AND EVAPORATOR CONDITIONS
    (Yildiz Technical Univ, 2019) Aksu, B.; Uysal, C.; Kurt, H.
    A thermoeconomic analysis of a water to water heat pump are performed under different condenser and evaporator conditions. Experiments are realized for different volumetric inlet temperatures of 14.4, 17 and 19 degrees C and different volumetric flow rates of 50, 100, 150 lt/h for condenser cooling water. Same inlet temperatures with condenser cooling water are used for evaporator water inlet, while constant volumetric flow rate of 100 lt/h is used for each case. Modified Productive Structure Analysis (MOPSA) is used for thermoeconomic analysis. It is found that increases in inlet temperature and in volumetric flow rate cause to decrease in both the unit cost of heat delivered (C-H) and the unit cost of entropy generation (C-S). As a result, in the case of T-in =14.4 degrees C and (for all) over dot = 50 lt/h, C-H and C-S values are obtained to be 0.0489 $/kWh and 0.0221 $/kWh, respectively, while C-H and C-S values are obtained to be 0.0385 $/kWh and 0.0175 $/kWh for T-in =19 degrees C and (for all) over dot = 150 lt/h, respectively.