Plate heat exchanger – inertia flywheel performance in loss of flow transient
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T. Abou-El-Maaty
Abstract
One of the most versatile types of heat exchangers used is the plate heat exchanger. It has principal advantages over other heat exchangers in that plates can be added and/or removed easily in order to change the area available for heat transfer and therefore its overall performance. The cooling systems of Egypt's second research reactor (ETRR 2) use this type of heat exchanger for cooling purposes in its primary core cooling and pool cooling systems. In addition to the change in the number of heat exchanger cooling channels, the effect of changing the amount of mass flow rate on the heat exchanger performance is an important issues in this study. The inertia flywheel mounted on the primary core cooling system pump with the plate heat exchanger plays an important role in the case of loss of flow transients. The PARET code is used to simulate the effect of loss of flow transients on the reactor core. Hence, the core outlet temperature with the pump-flywheel flow coast down is fed into the plate heat exchanger model developed to estimate the total energy transferred to the cooling tower, the primary side heat exchanger temperature variation, the transmitted heat exchanger power, and the heat exchanger effectiveness. In addition, the pressure drop in both, the primary side and secondary side of the plate heat exchanger is calculated in all simulated transients because their values have limits beyond which the heat exchanger is useless.
Kurzfassung
Der Plattenwärmetauscher ist einer der am vielseitigsten einsetzbaren Wärmetauscher. Insbesondere bietet er die Möglichkeit einzelne Platten leicht hinzuzufügen bzw. auszubauen, um die zur Verfügung stehende Wärmeaustauschfläche und damit die Leistung des Wärmetauschers zu verändern. Im zweiten ägyptischen Forschungsreaktor (ETRR 2) werden Plattenwärmetauscher im primären Kern- und Beckenkühlsystem eingesetzt. In diesem Beitrag wird der Einfluss der Änderung der Anzahl der Kühlkanäle (durch Veränderung der Plattenanzahl) sowie der Einfluss einer sprunghaften Verringerung des Eintrittsmassenstroms, z. B. nach einer Schnellabschaltung, auf die Leistung des Wärmetauschers untersucht. Das zur Berechnung dieses Verhaltens entwickelte thermohydraulische Modell wird in diesem Beitrag beschrieben. Bei einer Loss of Flow Transiente hat die Trägheit des Schwungrads der Primärsystempumpe eine verzögernde Wirkung auf die Abnahme des Eintrittsmassenstroms des Wärmetauschers, der direkt hinter der Pumpe angeordnet ist. Um den Einfluss auf den Kern eines Forschungsreaktors zu berechnen wurde zusätzlich das Programm PARET verwendet. Die Kopplung des Modells und des Programms erfolgt über den Eintrittsmassenstrom in den Kern nach dem Durchlauf des Wärmetauschers und der Nachzerfallsleistung des Kerns. Berechnet wird die mittlere Kernaustrittstemperatur. Durch eine Variation der Eingabeparameter lässt sich so der Verlauf der Kernaustrittstemperatur bestimmen. Auch die Druckdifferenzen auf der Primär- und der Sekundärseite des Plattenwärmetauschers werden bei allen Transientenrechnungen mit berücksichtigt, da ihre Größen nur innerhalb einer vom jeweiligen Plattenwärmetauscher abhängigen Bandbreite liegen dürfen, um einen sinnvollen Betrieb zu gewährleisten.
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© 2009, Carl Hanser Verlag, München
Artikel in diesem Heft
- Contents/Inhalt
- Contents
- Summaries/Kurzfassungen
- Summaries
- Technical Contributions/Fachbeiträge
- AVR prototype pebble bed reactor: a safety re-evaluation of its operation and consequences for future reactors
- Design Concept of the High Performance Light Water Reactor
- Behavior of CANDU fuel under power pulse conditions at the TRIGA reactor of INR Pitesti
- Plate heat exchanger – inertia flywheel performance in loss of flow transient
- Performance analyses of the communication networks of a modern supervision and control system of research reactors
- Thermal analytical model for MoO3 ampoules irradiated in a high neutron flux
- Effect of using various grades of plutonium in the protective liquid wall of an IFE type fusion reactor
- A discrete ordinates scheme for void fraction evaluation with nonstandard reflective conditions and weakly divergent beams
- Application of the Laplace transform method for the albedo boundary conditions in multigroup neutron diffusion eigenvalue problems in slab geometry
- Modified Chebyshev polynomial (UN) approximation in the neutron transport theory and computation of critical half thicknesses
- Optimizing the dynamic response of the H. B. Robinson nuclear plant using multiobjective particle swarm optimization
- Assessment for inside building dispersion of aerosol from an outdoor radiological release
- Technical Notes/Technische Mitteilungen
- Analysis of a steam generator tube rupture under realistic initial and boundary conditions
Artikel in diesem Heft
- Contents/Inhalt
- Contents
- Summaries/Kurzfassungen
- Summaries
- Technical Contributions/Fachbeiträge
- AVR prototype pebble bed reactor: a safety re-evaluation of its operation and consequences for future reactors
- Design Concept of the High Performance Light Water Reactor
- Behavior of CANDU fuel under power pulse conditions at the TRIGA reactor of INR Pitesti
- Plate heat exchanger – inertia flywheel performance in loss of flow transient
- Performance analyses of the communication networks of a modern supervision and control system of research reactors
- Thermal analytical model for MoO3 ampoules irradiated in a high neutron flux
- Effect of using various grades of plutonium in the protective liquid wall of an IFE type fusion reactor
- A discrete ordinates scheme for void fraction evaluation with nonstandard reflective conditions and weakly divergent beams
- Application of the Laplace transform method for the albedo boundary conditions in multigroup neutron diffusion eigenvalue problems in slab geometry
- Modified Chebyshev polynomial (UN) approximation in the neutron transport theory and computation of critical half thicknesses
- Optimizing the dynamic response of the H. B. Robinson nuclear plant using multiobjective particle swarm optimization
- Assessment for inside building dispersion of aerosol from an outdoor radiological release
- Technical Notes/Technische Mitteilungen
- Analysis of a steam generator tube rupture under realistic initial and boundary conditions
