30 Questions
In a parallel flow arrangement, what can be restricted?
Max wall temperature
What is the main difference in mean temperature difference between parallel flow and counter-flow arrangements?
Mean temperature difference is higher in counter-flow
What is a key criteria for the selection of tube bundle configuration?
Max compact size
In a steam generator with a reverse scheme, where is the medium with higher pressure located?
Inside the intertubular space
What is a solution provided for decreasing thermal stresses in heat exchangers?
Special compensators on casing
What is a disadvantage of steam generators with a reverse scheme?
Metal intensity
What component experiences self-compensation due to tube bend in certain heat exchangers?
Heat-exchange tubes
Which type of flow arrangement results in a higher mean temperature difference?
Counter flow
What is a feature of the heat exchange surface of a horizontal SG of WWER-440 and 1000 mentioned in the text?
U-tubes
What is the location pattern in a direct scheme steam generator?
Working fluid inside tubes, heat-transfer agent in intertubular space
What is a challenge in steam generators with a reverse scheme that requires intensifying heat transfer?
Low flow rate in tubes
Which type of steam generator has a typical example known as LMC SG of OPG-2 type?
Steam generators with a reverse scheme
What is the abbreviated term for Nuclear Power Plant?
NPP
Which type of reactor is known as a pressurized water reactor?
PWR
In the context of the text, what does the term 'CANDU' refer to?
Pressurized heavy water cooled heavy water moderated reactor
What parameter describes the mass steam content in a BWR power unit?
$x > 0.4$
What is the thermal power of a typical BWR power unit as mentioned in the text?
$Q = 3579$ MW
Which type of reactor uses coolant parameters where pressure and temperature are approximately equal to each other?
LWCGR
What factors specify the intensity of convective heat transfer?
Geometry of heat transfer surface, coolants’ physical parameters, flow hydrodynamics
What type of flow conditions do NPP steam generators operate under on the coolant side?
Two-phase flow conditions
What is a challenge related to the investigations into heat transfer and hydrodynamics of two-phase flows in NPP steam generators?
Absence of accurate computational dependences for various two-phase parameters
To ensure reliability in continuous long-term operation, what condition must be fulfilled regarding the temperatures in steam generator tube walls?
(tw)perm > tw
Which of the following steel grades has a max permissible temperature of (tm)perm?
1Х18Н10Т
What is considered to be thoroughly studied regarding heat transfer and hydrodynamic regularities in NPP steam generators?
Single-phase flows
What is the main purpose of constructional calculations for NPP steam generators?
Calculating the geometrical dimensions of main elements of the steam generator
Which materials are typically used for heat-exchange surfaces in NPP steam generators?
Austenite-class alloys
How is the thickness of the cylindrical wall of a steam generator determined?
$2 \times φ \times [σ0.2] \times pd$
What is the typical design pressure used inside a vessel for constructional calculations in NPP steam generators?
125% of nominal value
Which type of SG element arrangement involves separate modules like evaporator, reheater, and superheater?
Section-module type
What is the significance of choosing the diameters of tubes in NPP steam generators?
Affecting the heat transfer efficiency
Understand the concept of restricting maximum wall temperature in parallel flow systems with the help of schematic diagrams showing flow arrangements of coolant and working fluid in both parallel and counter-flow setups. Learn about the impact of temperature differences and heat exchange surface area on wall temperatures.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
