Two-phase flow metering of maldistribution inside a header by means of venturi flowmeter solely

In evaporators, the distribution of the liquid and vapor phases among the channels is a convoluted problem, depending on a wide range of parameters. However, maldistribution causes important losses of performance. Due to their complexity, the accurate modeling of such two-phase flows is difficult to handle. Hence, experimental studies are...

Endothermic Heat Sinks for High-speed Supersonic Applications

Traditional fuel system designs do not provide the combination of sucient cooling and low system weight at the Mach 5+ range. Thus, if currently available non-cryogenic propellants are to be employed, an additional heat sink source beyond a simple physical heat sink is required to meet the regenerative cooling demand. The endothermic...

Entropy production minimisation of a compression-resorption heat pump

Waste heat recovery is essential to reduce energy consumption in industry. A heat pump can be used to upgrade waste heat to a temperature level that is suitable for process heat. This study concerns a compression-resorption heat pump. The goal is to optimise the heat pump energetically, while keeping the investment attractive. Entropy production...

Working fluid selection for a diesel engine waste heat recovery ORC module: Integral optimization of an ORC system

The Organic Rankine Cycle (ORC) is a thermodynamic cycle for the conversion of heat into electricity. ORC technology is applied to waste heat, biomass and natural heat sources, there is currently over 2000 MW installed capacity worldwide. Triogen is a Dutch company producing standardized ORC modules for the application with gaseous (waste) heat...

Design of a cooling system for the hybrid engine

In recent times the fuel prices have increased significantly. This implies major reductions in profit margins for airlines. Additionally the increasingly stringent emission standards for aircraft generate the need for better fuel economy. This master thesis aims at providing a contribution to lower the emissions made by future turbofan engines...

Heat integrated distillation in a plate-packing HIDiC

Distillation is an energy intensive separation method. To improve the exergetic efficiency of a distillation column, it can be designed as a heat integrated distillation column (HIDiC). In a HIDiC the vapour leaving the stripping section is compressed to the desired level and the rectification section is operated at a higher pressure and...

A structured approach to heat exchanger network retrofit design

Process plants have high energy consumption. Much energy can be saved by a proper design of the heat exchanger network, which contains the main heat transferring equipment of the plant. Existing plants can often be made more energy-efficient by a retrofit: the (physical) modification of the equipment and piping in the heat exchanger network....

Fluidized bed heat exchangers to prevent fouling in ice slurry systems and industrial crystallizers

Ozon layer depletion and global warming by synthetic refrigerants forces refrigeration industries to switch over to natural but hazardous refrigerants like ammonia and hydrocarbons. A promising technology to safely use the latter refrigerants is the application of indirect refrigeration systems with ice slurry as heat transfer fluid. Ice slurry,...

Determination of the heat transfer coefficient distribution on the longitudinal finned tubes in staggered arrangement using inverse and cfd method

Local heat transfer from a cylinder in tube bank has been extensively studied. In many applications such as design of heat exchangers, detailed information regarding the circumferential and longitudinal variation of heat transfer to a cylinder is required. There are many different methods for measuring local heat transfer like techniques using...

A study of fluid flow and heat transfer of three-dimensional plate-fin and tube heat exchangers by the least-squares finite element method

A numerical calculation procedure based on the least-squares finite element method (LSFEM) is employed to study the fluid flow and heat transfer in a 3-D heat exchangers with in-lined and staggered multiple-row (4 rows) tubes. In this study, the fin pitch of the heat exchanger is 8 fins per inch and the fluid flow is assumed steady,...