Optimum design of fluid distribution systems in heat exchangers

2010 ◽  
Vol 6 (5) ◽  
pp. 750-759 ◽  
Author(s):  
Vojtěch Turek ◽  
Jiří Hájek ◽  
Zdeněk Jegla ◽  
Petr Stehlík
Keyword(s):  
Optimum Design ◽  
Heat Exchangers ◽  
Distribution Systems ◽  
Fluid Distribution

scholarly journals Minimum mass vascular networks in multifunctional materials

2007 ◽  
Vol 5 (18) ◽  
pp. 55-65 ◽  
Author(s):  
H.R Williams ◽  
R.S Trask ◽  
P.M Weaver ◽  
I.P Bond
Keyword(s):  
Distribution Systems ◽  
Vessel Diameter ◽  
Constructal Theory ◽  
Fluid Distribution ◽  
Minimum Mass ◽  
Vascular Networks ◽  
Small Deviations ◽  
Structural Integration ◽  
Turbulent Flow Regime ◽  
Design Case

A biomimetic analysis is presented in which an expression for the optimum vessel diameter for the design of minimum mass branching or vascular networks in engineering applications is derived. Agreement with constructal theory is shown. A simple design case is illustrated and application to more complex cases with branching networks of several generations discussed. The analysis is also extended into the turbulent flow regime, giving an optimization tool with considerable utility in the design of fluid distribution systems. The distribution of vessel lengths in different generations was also found to be a useful design variable. Integrating a network into a structure is also discussed. Where it is necessary to adopt a non-optimum vessel diameter for structural integration, it has been shown that small deviations from the minimum mass optimum can be tolerated, but large variations could be expected to produce a punitive and rapidly increasing mass penalty.

Optimum design of horizontal ground-coupled heat pump systems using spiral-coil-loop heat exchangers

2016 ◽  
Vol 162 ◽  
pp. 330-345 ◽  
Author(s):  
Gyu-Hyun Go ◽  
Seung-Rae Lee ◽  
Seok Yoon ◽  
Min-Jun Kim
Keyword(s):  
Heat Pump ◽  
Optimum Design ◽  
Heat Exchangers ◽  
Spiral Coil ◽  
Ground Coupled Heat Pump

Optimum Design of Cross-Flow Shell and Tube Heat Exchangers with Low Fin Tubes

2008 ◽  
Vol 29 (10) ◽  
pp. 864-872 ◽  
Author(s):  
N. Benarji ◽  
C. Balaji ◽  
S. P. Venkateshan
Keyword(s):  
Optimum Design ◽  
Heat Exchangers ◽  
Cross Flow ◽  
Shell And Tube ◽  
Fin Tubes

Aero-Thermal Optimisation of a Spiral Primary Surface Recuperator: Modelling and Testing

2007 ◽  
Author(s):  
Hubert Antoine ◽  
Luc Prieels
Keyword(s):  
Pressure Drop ◽  
Heat Exchangers ◽  
Gas Flow ◽  
Central Zone ◽  
Flow Distribution ◽  
Fluid Distribution ◽  
Gas Flows ◽  
Surface Geometry ◽  
Half Angle ◽  
Flow Configurations

Recently, interest in spiral heat exchangers has grown for high temperature, high cycling applications, especially in the gas turbine industry. Air and gas flow distribution in heat exchangers is known to play a major role in their pressure drop performance and effectiveness. Modelling this distribution is needed to optimise the primary surface geometry. This optimisation has been applied to the ACTE spiral recuperator and resulted in smaller and lighter recuperators thanks to a better use of the metal. A specific CFD code was developed and used to investigate different ‘state of the art’ flow configurations and hydraulic diameters. The best of these was then adapted to ACTE’s manufacturing technology. The model has been validated by pressure drop, velocity profile and effectiveness measurements. The improved geometry consists of a primary surface cross-corrugated pattern for both air and gas flows (see fig. 4 and 5). The pattern includes a central zone with a half angle of 30° for counterflow and two lateral zones with a half angle of 45° for fluid distribution and collection. The corrugations are not strictly sinusoidal but include a flat area that allows welding the two sheets together. The sheet pair (or “doublet”) is thus made resistant to ballooning. It is also used to hoop the annular heat exchanger.

scholarly journals Investigation on the Optimum Design of Heat Exchangers in a Hybrid Closed Circuit Cooling Tower

1970 ◽  
Vol 37 ◽  
pp. 52-57
Author(s):  
MMA Sarker
Keyword(s):  
Heat Exchanger ◽  
Optimum Design ◽  
Heat Exchangers ◽  
Cooling Tower ◽  
Cooling Capacity ◽  
Closed Circuit ◽  
Design Parameters ◽  
Air Inlet ◽  
Staggered Arrangement ◽  
Temperature And Pressure

Investigation on the optimum design of a heat exchanger in a Hybrid Closed Circuit Cooling Tower having a rated capacity of 1RT is performed experimentally. The heat exchanger of dimension 0.4mx0.33mx0.572m has 15x7 bare type 15.88mm OD copper coils in staggered arrangement. The relevant design parameters were selected based on the typical East Asian meteorological constrains for the year-round smooth operation of the cooling tower. This study presents results related to the cooling capacity and the cooling efficiency with respect to wet bulb temperature and pressure drop with respect to air inlet velocity. Results are also presented in terms of number of transfer units (NTU). Cooling capacity was found to be close to the rated one for the wet mode but low in dry mode operation. Keywords: Hybrid closed circuit cooling tower, Cooling capacity, Wet mode, Dry modedoi:10.3329/jme.v37i0.820Journal of Mechanical Engineering Vol.37 June 2007, pp.52-77

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