CFD Simulation Studies on the Performance of Rectangular Coil Heat Exchanger

2010 ◽  
Author(s):  
N. Samsudeen ◽  
N. Anantharaman ◽  
Pol. Raviraj ◽  
Swapan Paruya ◽  
Samarjit Kar ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Cfd Simulation ◽  
Simulation Studies ◽  
Coil Heat Exchanger ◽  
Coil Heat

Thermodynamics Energy Efficiency Analysis and Thermal Modeling of Data Center Cooling Using Open and Closed-Loop Cooling Systems

2007 ◽  
Author(s):  
Ali Heydari
Keyword(s):  
Heat Exchanger ◽  
Thermal Management ◽  
Data Center ◽  
Closed Loop ◽  
Cfd Simulation ◽  
Open Loop ◽  
Cfd Model ◽  
Spot Cooling ◽  
Coil Heat Exchanger ◽  
Coil Heat

There is a strong need to improve our current capabilities in thermal management and electronic cooling, since estimates indicate that IC power density level could reach 500 W/cm2 in near future. This paper presents several possible closed and open loop cooling schemes for thermal management of electronic equipment in data centers. To be able to identify the overall energy consumption impact, a thermodynamics coefficient of performance (COP) analysis for a data center under each one of the proposed schemes is presented. A limited condition condition 2nd law of thermodynamics thermal efficiency (ηII) analysis of the proposed open-loop schemes is also presented. Using available performance data, the overall data center COP of open and closed-loop cooling schemes is evaluated. Also, the 2nd law efficiency of open-loop schemes is evaluated. To properly design and size the components of a liquid or refrigeration-assisted open or closed-loop cooling scheme requires heat exchanger modeling that need to be incorporated in existing CFD simulation models. For that, analytical modeling of two kinds of direct expansion refrigeration cooling evaporator and a secondary liquid cooling fan coil heat exchanger in conjunction with a computational fluid dynamics (CFD) model to analyze a refrigeration cooled high heat density electronic and computer data center installed on a raised floor is presented. Both models incorporate an accurate tube-by-tube thermal hydraulic modeling of the heat exchanger. The refrigeration coil analysis incorporates a multi region heat exchanger analysis for a more precise modeling of two phase refrigerant flow in the evaporator. The single phase secondary loop fan coil heat exchanger modeling uses an effectiveness method for regional modeling of the spot-cooling coil. Using an iterative method, results of the heat exchanger modeling is simultaneously incorporated in the CFD model and an optimal design of spot cooling heat exchanger is developed. The presented cooling schemes, theoretical thermodynamics analysis along with the detailed thermal-hydraulic heat exchanger simulation in conjunction with the state-of-the-art CFD simulation code should enable data center designers to be able to handle expected increased in heat density of the future data centers.

CFD Simulation Analysis of Pressure Drop in a Vertical Helical-Coil Heat Exchanger

2012 ◽  
Vol 562-564 ◽  
pp. 1095-1098
Author(s):  
Ning Jiang ◽  
Jia Li
Keyword(s):  
Heat Exchanger ◽  
Pressure Drop ◽  
Cfd Simulation ◽  
Simulation Analysis ◽  
Steel Tube ◽  
Stainless Steel Tube ◽  
Helical Coil ◽  
Two Phase ◽  
Coil Heat Exchanger ◽  
Coil Heat

The pressure drop in a helical-coil heat exchanger is studied. The helically coiled tube with a coil pitch of 1080 mm and coil diameter of 950 mm is fabricated by bending a stainless steel tube of 8m length and 15.6 mm inner diameter. The total height of the helix tube is 2.8 m. The concerned range of mass flow rate for two-phase flow is 25-100 kg/m2s. Computational fluid dynamics (CFD) simulation analysis of pressure drop in the vertical helical-coil heat exchanger is carried out.

scholarly journals Modeling the Temperature Field in the Ground with an Installed Slinky-Coil Heat Exchanger

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 4010
Author(s):  
Monika Gwadera ◽  
Krzysztof Kupiec
Keyword(s):  
Temperature Field ◽  
Heat Exchanger ◽  
Surface Temperature ◽  
Ground Surface ◽  
Heat Sources ◽  
Ground Surface Temperature ◽  
Coil Heat Exchanger ◽  
The Relationship ◽  
Temperature Responses ◽  
Coil Heat

In order to find the temperature field in the ground with a heat exchanger, it is necessary to determine temperature responses of the ground caused by heat sources and the influence of the environment. To determine the latter, a new model of heat transfer in the ground under natural conditions was developed. The heat flux of the evaporation of moisture from the ground was described by the relationship taking into account the annual amount of rainfall. The analytical solution for the equations of this model is presented. Under the conditions for which the calculations were performed, the following data were obtained: the average ground surface temperature Tsm = 10.67 °C, the ground surface temperature amplitude As = 13.88 K, and the phase angle Ps = 0.202 rad. This method makes it possible to easily determine the undisturbed ground temperature at any depth and at any time. This solution was used to find the temperature field in the ground with an installed slinky-coil heat exchanger that consisted of 63 coils. The results of calculations according to the presented model were compared with the results of measurements from the literature. The 3D model for the ground with an installed heat exchanger enables the analysis of the influence of miscellaneous parameters of the process of extracting or supplying heat from/to the ground on its temperature field.

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