Max Wall Temperature in Parallel Flow
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Questions and Answers

In a parallel flow arrangement, what can be restricted?

  • Smaller temperature difference
  • Max wall temperature (correct)
  • Heat exchange surface area
  • Mean temperature difference

What is the main difference in mean temperature difference between parallel flow and counter-flow arrangements?

  • Mean temperature difference is not mentioned in the text
  • Mean temperature difference is the same in both arrangements
  • Mean temperature difference is higher in parallel flow
  • Mean temperature difference is higher in counter-flow (correct)

What is a key criteria for the selection of tube bundle configuration?

  • Lack of self-compensation
  • Max compact size (correct)
  • Increased heat exchange surface area
  • Higher thermal stresses

In a steam generator with a reverse scheme, where is the medium with higher pressure located?

<p>Inside the intertubular space (C)</p> Signup and view all the answers

What is a solution provided for decreasing thermal stresses in heat exchangers?

<p>Special compensators on casing (B)</p> Signup and view all the answers

What is a disadvantage of steam generators with a reverse scheme?

<p>Metal intensity (B)</p> Signup and view all the answers

What component experiences self-compensation due to tube bend in certain heat exchangers?

<p>Heat-exchange tubes (D)</p> Signup and view all the answers

Which type of flow arrangement results in a higher mean temperature difference?

<p>Counter flow (C)</p> Signup and view all the answers

What is a feature of the heat exchange surface of a horizontal SG of WWER-440 and 1000 mentioned in the text?

<p>U-tubes (A)</p> Signup and view all the answers

What is the location pattern in a direct scheme steam generator?

<p>Working fluid inside tubes, heat-transfer agent in intertubular space (C)</p> Signup and view all the answers

What is a challenge in steam generators with a reverse scheme that requires intensifying heat transfer?

<p>Low flow rate in tubes (C)</p> Signup and view all the answers

Which type of steam generator has a typical example known as LMC SG of OPG-2 type?

<p>Steam generators with a reverse scheme (A)</p> Signup and view all the answers

What is the abbreviated term for Nuclear Power Plant?

<p>NPP (D)</p> Signup and view all the answers

Which type of reactor is known as a pressurized water reactor?

<p>PWR (D)</p> Signup and view all the answers

In the context of the text, what does the term 'CANDU' refer to?

<p>Pressurized heavy water cooled heavy water moderated reactor (A)</p> Signup and view all the answers

What parameter describes the mass steam content in a BWR power unit?

<p>$x &gt; 0.4$ (D)</p> Signup and view all the answers

What is the thermal power of a typical BWR power unit as mentioned in the text?

<p>$Q = 3579$ MW (C)</p> Signup and view all the answers

Which type of reactor uses coolant parameters where pressure and temperature are approximately equal to each other?

<p>LWCGR (A)</p> Signup and view all the answers

What factors specify the intensity of convective heat transfer?

<p>Geometry of heat transfer surface, coolants’ physical parameters, flow hydrodynamics (A)</p> Signup and view all the answers

What type of flow conditions do NPP steam generators operate under on the coolant side?

<p>Two-phase flow conditions (A)</p> Signup and view all the answers

What is a challenge related to the investigations into heat transfer and hydrodynamics of two-phase flows in NPP steam generators?

<p>Absence of accurate computational dependences for various two-phase parameters (A)</p> Signup and view all the answers

To ensure reliability in continuous long-term operation, what condition must be fulfilled regarding the temperatures in steam generator tube walls?

<p>(tw)perm &gt; tw (C)</p> Signup and view all the answers

Which of the following steel grades has a max permissible temperature of (tm)perm?

<p>1Х18Н10Т (A)</p> Signup and view all the answers

What is considered to be thoroughly studied regarding heat transfer and hydrodynamic regularities in NPP steam generators?

<p>Single-phase flows (C)</p> Signup and view all the answers

What is the main purpose of constructional calculations for NPP steam generators?

<p>Calculating the geometrical dimensions of main elements of the steam generator (B)</p> Signup and view all the answers

Which materials are typically used for heat-exchange surfaces in NPP steam generators?

<p>Austenite-class alloys (B)</p> Signup and view all the answers

How is the thickness of the cylindrical wall of a steam generator determined?

<p>$2 \times φ \times [σ0.2] \times pd$ (A)</p> Signup and view all the answers

What is the typical design pressure used inside a vessel for constructional calculations in NPP steam generators?

<p>125% of nominal value (C)</p> Signup and view all the answers

Which type of SG element arrangement involves separate modules like evaporator, reheater, and superheater?

<p>Section-module type (C)</p> Signup and view all the answers

What is the significance of choosing the diameters of tubes in NPP steam generators?

<p>Affecting the heat transfer efficiency (C)</p> Signup and view all the answers

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