Güncel Gönderiler: Enerji Sistemleri Mühendisliği Bölümü Koleksiyonu
Toplam kayıt 117, listelenen: 61-80
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Investigating the exergetic and environmental effects of subcooling and superheating processes on the performance of direct expansion systems
(Springer International Publishing, 2014)Recently, subcooling and superheating applications, which are proposed as an approach for the efficient use of energy, have positive effect on the emission next to increasing the energy efficiency. This study examines ... -
Energy analysis of hydrogen production from a hybrid wind turbine-electrolyzer system
(Springer International Publishing, 2014)In this study, the energy performance of hybrid wind-hydrogen system is investigated. In addition to energy performance, a cost analysis of hydrogen production is also carried out for stand-alone system for different PEM ... -
Prediction of daily average global solar radiation and parabolic monthly irradiation model parameters for Turkey
(Springer International Publishing, 2014)The amount of solar radiation falling on the surface of the earth is a very important data for engineers and scientists tomodel the solar energy systems and to design and carry out a performance analysis. Solar global ... -
Evaluation of waste human hair as graphene oxide and examination of some characteristic properties
(TUBITAK, 2020)In this study, graphene oxide was synthesized from activated carbon obtained from waste hair for the first time using Modified Hummers method. the Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy ... -
Investigation of a hybrid solar and geothermal driven absorption cooling system for district applications
(Inderscience Enterprises Ltd, 2012)In this paper, a new hybrid geothermal and solar driven absorption cooling system (ACS) is proposed for low-temperature district energy applications. Two approaches are proposed in this study, namely: (a) a new model for ... -
A novel approach for estimation of photovoltaic exergy efficiency
(Pergamon-Elsevier Science Ltd, 2012)In this study, a novel approach is proposed to determine the maximum amount of exergy from the sun when applied to a conventional photovoltaic (PV) system in order to formulate its exergy efficiency. the variations of ... -
Performance assessment of a novel hybrid district energy system
(Pergamon-Elsevier Science Ltd, 2012)In this paper, a new hybrid system for improving the efficiency of geothermal district heating systems (GDHSs) is proposed. This hybrid system consists of biogas based electricity production and a water-to-water geothermal ... -
Estimation of the monthly based hourly wind speed characteristics and the generated power characteristics for developing bidding strategies in an actual wind farm: a case study
(Springer Heidelberg, 2013)This manuscript proposes a new approach for the estimation of the monthly based hourly wind speed characteristics and the generated power characteristics in an actual wind farm. the proposed approach uses the probability ... -
Inverse magnetocaloric effect of epitaxial Ni-Mn-Sn thin films
(Amer Inst Physics, 2013)Epitaxial Ni-Mn-Sn thin films of 200 nm thickness were prepared by magnetron sputtering and deposited onto MgO(100) substrate. They reveal an inverse magnetocaloric effect with a martensitic phase transition around 260 K. ... -
Hydrothermal gasification of Rosa Damascena residues: Gaseous and aqueous yields
(Elsevier, 2014)The gasification of Rosa Damascena residues - by-products of the rose-oil industry - was investigated under hydrothermal conditions at 500 degrees C and 600 degrees C, 35-45 MPa pressure with a reaction time of 1 h. the ... -
Supercritical conversion of biomass
(Blackwell Science Publ, 2014)The focus of this chapter is biomass conversion in the supercritical water. the two main processes of the supercritical conversion of biomass are the supercritical water gasification and the supercritical water oxidation. ... -
A new approach to determine the outdoor temperature distributions for building energy calculations
(Pergamon-Elsevier Science Ltd, 2014)This study formulated annual, monthly and hourly ambient temperature distributions for simplifying the calculation of cooling and heating degree-hours. in this regard, Turkey was selected as an application country, of which ... -
The magnetostructural and magnetocaloric properties of CoMnGe1-xGaxB0.015 (x=0.05 and 0.06) alloys
(Elsevier Science Bv, 2014)The magnetostructural and magnetocaloric properties of CoMnGe1-xGaxB0.015 (x=0.05 and 0.06 are named Alloy-1 and Alloy-2, respectively) alloys have been investigated by X-ray powder diffraction, calorimetric and magnetization ... -
The magnetic and magnetocaloric properties of CoMnGe1-xGax alloys
(Elsevier Science Sa, 2014)The magnetic and magnetocaloric properties of CoMnGe1 Ga-x(x) (0.02 <= x <= 0.063) alloys have been investigated by using calorimetric, X-ray diffraction and magnetic measurements. Our results show that the structural and ... -
Fault diagnosis of a vapor compression refrigeration system with hermetic reciprocating compressor based on p-h diagram
(Elsevier Sci Ltd, 2014)The aim of this study is to show how to use the p-h diagram successfully for diagnosing faults in the vapor compression refrigeration cycle. This new approach is able to remove the gap between the information required to ... -
Comparing advanced exergetic assessments of two geothermal district heating systems for residential buildings
(Elsevier Science Sa, 2014)Advanced exergy analysis method has been increasingly utilized in analyzing and assessing the performance of energy-related systems in recent years due to more deeply investigating the exergy destructions. in this study, ... -
The effect of the substitution of Cu for Mn on magnetic and magnetocaloric properties of Ni50Mn34In16
(Elsevier Science Bv, 2014)The influence of Cu substitution for Mn on magnetic and magnetocaloric properties has been investigated in Ni50Mn34-xCuxIn16 (x=1.3 and 1.6) Hensler alloys by using calorimetric and magnetic measurements. the temperature ... -
Investigation of Cd1-xCoxS diluted magnetic semiconductor thin films fabricated by chemical bath deposition method
(Elsevier Science Sa, 2014)Chemical bath deposition method was used for preparation of Cd1-xCoxS thin films. the effects of Co doping and thermal annealing on structural, optical, electrical and magnetic properties of CdS thin films were investigated. ... -
Effects of size reduction on the magnetic and magnetocaloric properties of NdMn2Ge2 nanoparticles prepared by high-energy ball milling
(Wiley-V C H Verlag Gmbh, 2015)A nanostructured NdMn2Ge2 sample is prepared by a high-energy ball-milling technique. the structural and magnetic properties of ball-milled nanopowder have been studied by high-resolution transmission electron microscopy ...
