Steady-state simulation of ammonia converter - heat exchanger system

1982 ◽  
Vol 21 (3) ◽  
pp. 470-476 ◽  
Author(s):  
Michael J. Khayan ◽  
Filippo F. Pironti
Keyword(s):  
Steady State ◽  
Heat Exchanger ◽  
Converter Heat ◽  
Steady State Simulation

scholarly journals Implementation of a Single Effect Absorption LiBr-H2O Refrigeration Chiller by using Thermodynamic Modeling and Steady State Simulation

2019 ◽  
Vol 8 (2) ◽  
pp. 2900-2906
Keyword(s):  
Steady State ◽  
Heat Exchanger ◽  
Heat Source ◽  
Operating Parameter ◽  
High Heat ◽  
Cycle Performance ◽  
Refrigeration System ◽  
Single Effect ◽  
Steady State Simulation ◽  
The Impact

The objective of this research paper is to present steady state simulation model and EES program for design and thermodynamic analysis is used to predict the performance of single effect vapor absorption chiller. The working condition of steam is entering and exit to the generator. At that point, the program gives the thermodynamic properties of all purposes of the state, for example, design information each heat exchangers in the cycle and the overall performance of the cycle. The outcome is from EES program is utilized to contemplate the impact of structure parameters on cycle performance. In the conventional absorption refrigeration system dilute solution of LiBr is directly goes to the generator at inlet of generator in this type high heat source is required and increasing the area of the generator. In this paper is to present incorporation of heat reclaimer in the solution heat exchanger and the generator. The addition of one heat exchanger with increasing COP as well as reduced heat source and heat transfer area in the generator. This program gives the operating parameter at all state points, design value of all heat exchanger and design performance of the system. The refrigeration capacity of the system is 100TR. To check the performance of system by using changing flow rate of heat source, heat exchanger effectiveness. The output of this program and simulation results use for the sizing of new refrigeration system.

scholarly journals MODELLING OF RSG-GAS HEAT EXCHANGER FOR STEADY-STATE SIMULATION

2018 ◽  
Vol 22 (1) ◽  
Author(s):  
Andi S Ekariansyah
Keyword(s):  
Steady State ◽  
Heat Exchanger ◽  
Thermal Power ◽  
Steady State Condition ◽  
Simulation Performance ◽  
Heat Exchanger Design ◽  
Power Simulation ◽  
Full Power ◽  
Steady State Simulation ◽  
Fuel Elements

MODELLING OF RSG-GAS HEAT EXCHANGER FOR STEADY-STATE SIMULATION. The multipurposes reactor G.A Siwabessy (RSG-GAS) is a open pool, water cooled reactor with plate type fuel elements having thermal power of 30 MWt. Its design has been a subject for research in term of its safety against postulated design basis accident. For the purpose of safety analysis, its complete design have been modelled using various thermalhydraulic code, which has to be validated for the steady-state condition. The model generated so far did not include the model of the heat exchanger as it is designed and described in the RSG-GAS design specification. Therefore the purpose of this research is to obtain a heat exchanger model as realistic as possible using the RELAP5/ SCDAP/Mod3.4 code. From the generated model, the performace of the heat exchanger design will be evaluated to analyze its effect on the steady-state simulation during RSG-GAS full power. The simulation results show that the performance of the obtained heat exchanger model has been validated with the design specifications to remove the core heat during the full power simulation. On that condition, the inlet secondary temperature and loss coefficient plays important role in taking the inlet and outlet primary temperature to be close with the experimental data and other RSG-GAS model.Keywords: RSG-GAS, heat exchanger model, RELAP5, steady state simulation, performance

A matrix approach for steady-state simulation of heat exchanger networks

2007 ◽  
Vol 27 (14-15) ◽  
pp. 2385-2393 ◽  
Author(s):  
Luiz O. de Oliveira Filho ◽  
Eduardo M. Queiroz ◽  
André L.H. Costa
Keyword(s):  
Steady State ◽  
Heat Exchanger ◽  
Matrix Approach ◽  
Heat Exchanger Networks ◽  
Steady State Simulation

Cyclic Breathing Simulations in Large Scale Models of the Lung Airway From the Oronasal Opening to the Terminal Bronchioles

2012 ◽  
Author(s):  
D. Keith Walters ◽  
Greg W. Burgreen ◽  
Robert L. Hester ◽  
David S. Thompson ◽  
David M. Lavallee ◽  
...  
Keyword(s):  
Steady State ◽  
Boundary Conditions ◽  
Large Scale ◽  
Whole Body ◽  
Patient Specific ◽  
Cfd Simulations ◽  
Reduced Order ◽  
Scale Models ◽  
Steady State Simulation ◽  
Conducting Zone

Computational fluid dynamics (CFD) simulations were performed for unsteady periodic breathing conditions, using large-scale models of the human lung airway. The computational domain included fully coupled representations of the orotracheal region and large conducting zone up to generation four (G4) obtained from patient-specific CT data, and the small conducting zone (to G16) obtained from a stochastically generated airway tree with statistically realistic geometrical characteristics. A reduced-order geometry was used, in which several airway branches in each generation were truncated, and only select flow paths were retained to G16. The inlet and outlet flow boundaries corresponded to the oronasal opening (superior), the inlet/outlet planes in terminal bronchioles (distal), and the unresolved airway boundaries arising from the truncation procedure (intermediate). The cyclic flow was specified according to the predicted ventilation patterns for a healthy adult male at three different activity levels, supplied by the whole-body modeling software HumMod. The CFD simulations were performed using Ansys FLUENT. The mass flow distribution at the distal boundaries was prescribed using a previously documented methodology, in which the percentage of the total flow for each boundary was first determined from a steady-state simulation with an applied flow rate equal to the average during the inhalation phase of the breathing cycle. The distal pressure boundary conditions for the steady-state simulation were set using a stochastic coupling procedure to ensure physiologically realistic flow conditions. The results show that: 1) physiologically realistic flow is obtained in the model, in terms of cyclic mass conservation and approximately uniform pressure distribution in the distal airways; 2) the predicted alveolar pressure is in good agreement with previously documented values; and 3) the use of reduced-order geometry modeling allows accurate and efficient simulation of large-scale breathing lung flow, provided care is taken to use a physiologically realistic geometry and to properly address the unsteady boundary conditions.

scholarly journals A SIMPLE FIVE-STEP METHODOLOGY TO DETERMINE CONTROLLABILITY OF HEAT EXCHANGER NETWORKS USING STEADY-STATE INFORMATION

2011 ◽  
Author(s):  
Rodolfo Tellez ◽  
William Y. Svrcek ◽  
Brent R. Young
Keyword(s):  
Steady State ◽  
Heat Exchanger ◽  
Process Integration ◽  
Plant Design ◽  
State Information ◽  
Step Procedure ◽  
Heat Exchanger Networks ◽  
Propose Control Strategy ◽  
Optimum Heat ◽  
And Control

Process integration design methodologies have been developed and introduced to synthesise an optimum heat exchanger network (HEN) arrangement. However, controllability issues are often overlooked during the early stages of a plant design. In this paper we present a five-step procedure that involves the use of multivariable disturbance and control analyses based solely on steady-state information and with the purpose to assess process design developments and to propose control strategy alternatives appropriate and suitable for a HEN.

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