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

Heat Exchanger Design for Ocean Thermal Difference Power Plants

1975 ◽  
Vol 97 (3) ◽  
pp. 1035-1045 ◽  
Author(s):  
J. G. McGowan ◽  
J. W. Connell
Keyword(s):  
Heat Exchanger ◽  
Power Plants ◽  
Thermal Power ◽  
Thermal Power Plants ◽  
Optimization Program ◽  
Preliminary Results ◽  
Heat Exchanger Design ◽  
Analytical Results ◽  
Thermal Difference

This paper discusses variations in heat exchanger design and configuration for a class of ocean thermal power plants. Details of the heat exchanger models are summarized and analytical results for component and cycle variations are presented. A heat exchanger optimization program is discussed in detail and preliminary results for this study are given.

Validation Experiment for the Cooling Capability of Passive Auxiliary Feedwater System (PAFS) With PASCAL Facility

2012 ◽  
Author(s):  
Byoung-Uhn Bae ◽  
Seok Kim ◽  
Yu-Sun Park ◽  
Bok-Deuk Kim ◽  
Kyoung-Ho Kang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Heat Exchanger ◽  
System Analysis ◽  
Thermal Power ◽  
Heat Removal ◽  
Steady State Condition ◽  
Single Tube ◽  
Decay Heat ◽  
Validation Experiment

The Passive Auxiliary Feedwater System (PAFS) is one of the advanced safety features adopted in the APR+ (Advanced Power Reactor Plus) which is intended to completely replace the conventional active auxiliary feedwater system. It removes the decay heat by cooling down the secondary system of the SG using condensation heat exchanger installed in the Passive Condensation Cooling Tank (PCCT). With an aim of validating the cooling and operational performance of the PAFS, PASCAL (PAFS Condensing Heat Removal Assessment Loop), was constructed to experimentally investigate the condensation heat transfer and natural convection phenomena in the PAFS. It simulates a single tube of the passive condensation heat exchangers, a steam-supply line, a return-water line, and a PCCT with a reduced area, which is equivalent to 1/240 of the prototype according to a volumetric scaling methodology with a full height. The objective of the experiment is to investigate the cooling performance and natural circulation characteristics of the PAFS by simulating a steady state condition of the thermal power. From the experiment, two-phase flow phenomena in the horizontal heat exchanger and PCCT were investigated and the cooling capability of the condensation heat exchanger was validated. Test results showed that the design of the condensation heat exchanger in PAFS could satisfy the requirement for heat removal rate of 540 kW per a single tube and the prevention of water hammer phenomenon inside the tube. It also proved that the operation of PAFS played an important role in cooling down the decay heat by natural convection without any active system. The present experimental results will contribute to improve the model of the condensation and boiling heat transfer, and also to provide the benchmark data for validating the calculation performance of a thermal hydraulic system analysis code with respect to the PAFS.

scholarly journals Simulasi dinamik sistem reaktor eksotermal adiabatik dengan alat penukar panas umpan-keluaran (FEHE)

2018 ◽  
Vol 5 (3) ◽  
pp. 513
Author(s):  
Tri P. Adhi ◽  
Gandi R. Setyadi
Keyword(s):  
Steady State ◽  
Heat Exchanger ◽  
Point Of View ◽  
Operational Parameter ◽  
Steady State Condition ◽  
Stable Case ◽  
Aspen Hysys ◽  
Mathematical Correlation ◽  
Operational Temperature ◽  
Process Operation

A study of dinamics behavior on adiahatic exothermal reactor with a Feed-Effluent Heat Exchanger (FEHE) is reported in this paper. In practice of a chemical proces industries, configuration of the heat integration of FEHE system are easi to found at process that involving adiabatic exothermal reactor with the demand of feed's heating and of reactor product's cooling. The FEHE system configuration increase the process thermal efficiency throught the use of heat flow on the reactor product to raise the temperature of reactor feed flow. From the steady state economical point of view, this off cource be very interesting to be implemented, althought controlling and operational considerations are need to be taken into account to keep those advantages un-eliminted by operational and controlling matters. The dynamic simulation can give some illustration on how the hehavior of process operation at FEHE system is. Dynamically this system can be examined so that the boundary of operational parameter which could mantain its stability and trigger unstable system can be known and determined. In this study, the simulation of dynamic and steady state condition on system of FEHE-adiabatic exothermal reactor has been performed by assist of process simulator Aspen-Hysys using ammonia synthesis as the model process. The examined un-stable case were the harmonic osilation phenomena on the operational temperature condition. The objective of this study was to obtain a mathematical correlation model that can be applied in predicting when the un-stable phenomena might be happen.Keywords: FEHE System, Oscillation Temperature, Unstabilize Operation  AbstrakSebuah kajian mengenai kelakuan dinamik sistem reaktor eksothermal adiabatik dengan alat pertukaran panas umpan-keluaran (Feed-Effluent Heat Exchanger, FEHE) disampaikan pada makalah ini. Dalam praktek industri proses kimia, konfigurasi integrasi pwws   sistem  FEHE mudah   ditemukan   pada    proses   yang    melihatkan    reaktor   eksothermal   adiahatik,   dengan kehutuhan pemmw.\·anlfiiiJHIII   reaktor dan pendinginan produk reakt01 Konfigurasi sistem FEHE memherikan  pening/wtan   efisiensi  thermal  proses   melalui  pemanfctatan   a/iran  panas  produk reaktor untuk  menaikkan  tempera fur  a/iran umpan reakt01  Dari sudut pmzdang  ekonomi sistem tunak,   lentu   saja   hal   tersehut   sangat   menarik    1111/uk   diimplemen/asilwn,    a/am   tetapi pertimhangan-pertimhangan    operasi  dan pengendalian   harus  diperhatikan  agar  keuntungan  ini tidak  lere/iminasi  oleh permasalahan-permasalahan   pengendalian   dan pengoperasian.   Simulasi dinamik  dapat  memherilwn  gmnbaran  hagaimana  kelalwan  operasi proses  pada  sistem  FEHE. Secara  dinamik,  sistem  ini dapat  diuji  sehingga  batas-batas  parameter   operasi vang  menjaga kestahilan  danmemicu  ketidakstahilan  dari sis/em  dapat diketaluti  dan ditentukan. Dalam  kajiwz ini simulasi  kondisi  lunak  dan  dinamik. sistem  reaktor  eksothermal  adiahatik-FEHE  dilakukan dengan  hantzwn  simulator  proses  Aspen-Hv.1ys  dengan  mengamhil  sintesi.1·  amoniak  sehagai model  proses.   Kasus  ketidak-stabilan  yang   dikaji  adalah jetwmena    osilasi  harmonik  kondisi tenzperatur operasi.  Tujuan yang  hendak dicapai dari kajian ini adalah untuk mendapatkan  suatu model  korelasi   matematik  yang   dapal  digunalwn   untuk  mcmprediksi  kapan  saat   terjadinyafenomena   ketidak-stahilanlersehut.Kata kunci: Ketidak-stabilan Operasi, Osilasi Temperatur, Sistem FEHE

scholarly journals On the Effectiveness of Heat-Exchanger Bypass Control

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 244
Author(s):  
Nicolò Soave ◽  
Massimiliano Barolo
Keyword(s):  
Steady State ◽  
Heat Exchanger ◽  
Heat Exchangers ◽  
Graphical Representation ◽  
Mass Balances ◽  
Heat Exchanger Design ◽  
Rules Of Thumb ◽  
Improve Heat Transfer ◽  
Steady State Heat ◽  
The One

In heat exchangers with bypassing, a fraction of the flowrate of one fluid (typically the one whose temperature needs to be controlled tightly) bypasses the exchanger and mixes right after the exchanger outlet with the fraction flowing through the exchanger. The advantages of this configuration are long known. Among them, the most significant is that it can improve heat-transfer control because the temperature dynamics is significantly faster than in a standard heat-exchanger configuration. Additionally, it can increase the rangeability of the process wherein the heat exchanger operates. Existing rules of thumb do not provide univocal indications for assigning the design bypass flowrate. In this study, using a simple graphical representation of steady-state heat and mass balances originally proposed for conventional heat-exchanger design, we clarify why and under which design conditions bypass control can be effective. Increased rangeability results from the fact that the heat-exchanger steady-state gain can be assigned by design when a bypass configuration is used, whereas it typically cannot in a conventional heat exchanger. The design bypass flowrate should therefore be assigned so as to make the heat exchanger operate in a region where the steady-state gain is relatively high (and constant).

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.

Reconsideration of a Scaling Study of CANDU-6 Moderator Tank Scaled-Down Test Facility

2014 ◽  
Author(s):  
Bo W. Rhee ◽  
H. T. Kim ◽  
Y. M. Song
Keyword(s):  
Steady State ◽  
Viscous Friction ◽  
Pressure Tube ◽  
Test Facility ◽  
Scaling Analysis ◽  
Steady State Condition ◽  
Order Of Magnitude ◽  
Computer Codes ◽  
Full Power ◽  
Cfd Analyses

According to the literature survey, several scaling studies have been performed to derive a set of scaling criteria which were thought to be suitable for reproducing the major thermal-hydraulic phenomena in a scaled-down CANDU moderator tank similar to that in a prototype power plant during a full power steady state condition [1,2,3]. The objective of building this scaled-down moderator tank is to generate the experimental data necessary to validate the computer codes which are used to analyze the accident analysis of CANDU-6 plants. The major variables of interests in this paper are moderator flow velocity and temperature of the moderator which is D2O inside the moderator tank during a steady state and transient conditions. The reason is that the local subcooling of the moderator is found to be a critical parameter determining whether the stable film boiling can sustain on the outer surface of the calandria tube if the contact of overheated pressure tube and cold calandria tube should occur due to pressure tube ballooning during LBLOCA with ECC injection failure[4]. The key phenomena involved include the inlet jet development and impingement, buoyancy force driven by the moderator temperature gradient caused by non-uniform direct heating of the moderator, and the pressure drop due to viscous friction of the flow across the calandria tube array. In this paper, the previous researches are reviewed, some concerns or potential problems associated with them implied by comparing CFD analyses results between the CANDU-6 moderator tank and 1/4 scaled-down test facility are described, and as a way to examine the assumption of the scaling analysis is true an order-of-magnitude analyses are performed. Based on the results of these analyses the assumption of neglecting (∇*)2V* .and (∇*)2T* terms cannot be justified for the power of 0.5 MW and 1.566 MW for the 1/4 scaled-down facility. Further investigation is thought to be necessary to confirm this result, i.e. if the scaling of the previous work1 is justifiable by some other independent analyses.

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