CFD simulations and reduced order modeling of a refrigerator compartment including radiation effects

Bayer, Özgür
Paksoy, Akin
Aradağ Çelebioğlu, Selin
Considering the engineering problem of natural convection in domestic refrigerator applications, this study aims to simulate the fluid flow and temperature distribution in a single commercial refrigerator compartment by using the experimentally determined temperature values as the specified constant wall temperature boundary conditions. The free convection in refrigerator applications is evaluated as a three-dimensional (3D), turbulent, transient and coupled non-linear flow problem. Radiation heat transfer mode is also included in the analysis. According to the results, taking radiation effects into consideration does not change the temperature distribution inside the refrigerator significantly; however the heat rates are affected drastically. The flow inside the compartment is further analyzed with a reduced order modeling method called Proper Orthogonal Decomposition (POD) and the energy contents of several spatial and temporal modes that exist in the flow are examined. The results show that approximately 95% of all the flow energy can be represented by only using one spatial mode.


Quasi-dynamic model for an organic Rankine cycle
Bamgbopa, Musbaudeen O.; Uzgoren, Eray (Elsevier BV, 2013-08-01)
When considering solar based thermal energy input to an organic Rankine cycle (ORC), intermittent nature of the heat input does not only adversely affect the power output but also it may prevent ORC to operate under steady state conditions. In order to identify reliability and efficiency of such systems, this paper presents a simplified transient modeling approach for an ORC operating under variable heat input. The approach considers that response of the system to heat input variations is mainly dictated by...
Wellbore Modeling for Predicting the Flowing Behavior of Gas Condensate during Production
Adagulu, D.; Gumrah, F.; Sınayuç, Çağlar (Informa UK Limited, 2009-01-01)
Many models used to determine pressure and temperature profiles for two-phase flow systems assume that the fluid composition does not change along the wellbore. The aim of this study is to use and combine two-phase flow temperature and pressure profile models and include the effect of composition change for two-phase flow of gas condensate fluid through a wellbore under steady-state conditions. Temperature and pressure profiles obtained from varied composition and constant composition cases are compared for...
Evaluation of hybridsolar-wind-hydrogenenergy system based on methanol electrolyzer
Budak, Yagmur; DEVRİM, YILSER (Wiley, 2020-10-01)
In this study, it is aimed to meet the annual electricity and heating needs of a house without interruption with the photovoltaic panel, wind turbine, methanol electrolyzer, and high temperature proton exchange membrane fuel cell system. The system results show that the use of the 2 WT with 18 PV was enough to provide the need of the methanol electrolyzer, which provides requirements of the high temperature proton exchange membrane fuel cell. The produced heat by the fuel cell was used to meet the heat requ...
PEM fuel cell degradation effects on the performance of a stand-alone solar energy system
ÖZDEN, Ender; Tarı, İlker (Elsevier BV, 2017-05-04)
After comparing fresh and degraded performances of Polymer Electrolyte Membrane (PEM) based components of a hydrogen cycle with the help of computational fluid dynamics simulations, recently established stand-alone solar energy system producing hydrogen for energy storage is investigated focusing on the effects of degradation of fuel cells on the overall performance of the system. A complete model of the system has been developed using TRNSYS, and a degraded PEM Fuel Cell Subsystem has been incorporated int...
Reserve estimation using geostatistics
Kök, Mustafa Verşan (Informa UK Limited, 2008-01-01)
Application of geostatistics are being increasingly considered by reservoir analysts and engineers in generating more accurate reservoir models together with usable measures of spatial uncertainty. Geostatistics provides a probabilistic framework and a toolbox for data analysis with early integration of information. In this research, hydrocarbon volume of afield is estimated considering different parameters as gross rock volume, net to gross rock thickness, porosity, permeability, and saturation. Therefore,...
Citation Formats
Ö. Bayer, A. Paksoy, and S. Aradağ Çelebioğlu, “CFD simulations and reduced order modeling of a refrigerator compartment including radiation effects,” ENERGY CONVERSION AND MANAGEMENT, pp. 68–76, 2013, Accessed: 00, 2020. [Online]. Available: