4AE3 U3 C1 Obj1
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Questions and Answers

Which of the following is true about steam?

  • Steam is a gas that is produced by boiling water
  • Steam is a liquid that is produced by freezing water
  • Steam is a solid form of water
  • Steam is water that has been evaporated by adding heat (correct)

    • Why do Power Engineers produce steam?

  • To transfer heat energy in industrial processes (correct)
  • To produce clean energy
  • To convert electrical energy to mechanical energy
  • To cool down machinery

    • What is a characteristic of a good heat transfer fluid?

  • Transfers a lot of heat with a small mass (correct)
  • Does not expand when heated
  • Transfers a lot of heat with a large mass
  • Is toxic

    • Why is water an ideal heat transfer fluid?

    <p>It expands to several hundred times its volume when converted to steam</p> Signup and view all the answers

    What is the main use of steam in industrial processes?

    <p>Transferring heat energy</p> Signup and view all the answers

    Which industry sector does NOT use steam as a heat transfer medium?

    <p>Vehicle manufacturing</p> Signup and view all the answers

    What is the purpose of using steam in the tanning industry?

    <p>To control humidity</p> Signup and view all the answers

    What happens to steam in a unit heater?

    <p>It gives off heat and condenses</p> Signup and view all the answers

    What is the temperature of superheated steam?

    <p>500°C</p> Signup and view all the answers

    What is the purpose of injecting steam below ground in the oil industry?

    <p>To heat heavy oil</p> Signup and view all the answers

    Which component keeps steam in the heater and allows only condensate to pass through?

    <p>Steam trap</p> Signup and view all the answers

    What would happen if the heater did not have a steam trap?

    <p>The heater would fill up with condensate and not provide heat</p> Signup and view all the answers

    Where does the steam vent to if it goes directly to the condensate tank without passing through the heater?

    <p>Atmosphere</p> Signup and view all the answers

    What happens to the condensate once it is in the condensate tank?

    <p>It is pumped back into the boiler</p> Signup and view all the answers

    How does the basic system described in the text differ from most process steam systems?

    <p>All of the above</p> Signup and view all the answers

    Which of the following is NOT a reason why steam is important in industrial processes?

    <p>Steam is non-toxic</p> Signup and view all the answers

    How does water become steam?

    <p>By adding heat</p> Signup and view all the answers

    What is the primary duty of Power Engineers in relation to steam?

    <p>To control the equipment that produces steam</p> Signup and view all the answers

    Why is steam a preferred heat transfer fluid in many industrial processes?

    <p>It expands to several hundred times its volume</p> Signup and view all the answers

    How does the use of steam in industrial processes differ from its use at home?

    <p>Steam is produced in boilers in industry</p> Signup and view all the answers

    Which of the following is NOT a use of steam in the industrial sector?

    <p>Automotive manufacturing</p> Signup and view all the answers

    Which of the following is NOT a characteristic of steam?

    <p>Only generated by burning fuel</p> Signup and view all the answers

    What happens to the steam in a unit heater?

    <p>It condenses and becomes condensate</p> Signup and view all the answers

    Why is the condensate reused in the steam cycle?

    <p>Because it is pure and still contains heat</p> Signup and view all the answers

    What is the purpose of a steam trap in a heater?

    <p>To keep steam in the heater and allow only condensate to pass through</p> Signup and view all the answers

    What is the purpose of a steam trap in a heater?

    <p>To keep steam in the heater and allow only condensate to pass through</p> Signup and view all the answers

    What would happen if the steam in the heater did not spend enough time in the heat exchanger to give up heat and condense?

    <p>The steam would flow directly to the condensate tank</p> Signup and view all the answers

    What is the main purpose of the condensate tank in the steam cycle?

    <p>To cool down the condensate before it is pumped back into the boiler</p> Signup and view all the answers

    How does the basic system described in the text differ from most process steam systems?

    <p>It uses multiple steam-consuming processes operating simultaneously</p> Signup and view all the answers

    What does Figure 4 in the text represent?

    <p>A boiler in a small power plant</p> Signup and view all the answers

    Which of the following is NOT a reason why Power Engineers produce steam?

    <p>To convert water into a heat transfer fluid</p> Signup and view all the answers

    What is the main advantage of using steam as a heat transfer fluid in industrial processes?

    <p>It can transfer a lot of heat with a small mass</p> Signup and view all the answers

    What is the unique property of water that makes it ideal for heat transfer applications?

    <p>It expands to several hundred times its volume when converted to steam</p> Signup and view all the answers

    How does the use of steam in industrial processes differ from its use at home?

    <p>Steam is used to transfer heat energy in industrial processes</p> Signup and view all the answers

    What is the volume ratio of steam to water at 100 degrees Celsius?

    <p>1600:1</p> Signup and view all the answers

    Which industry sector does NOT use steam as a heat transfer medium?

    <p>Mining and metal refining</p> Signup and view all the answers

    What is the purpose of injecting steam below ground in the oil industry?

    <p>To heat heavy oil</p> Signup and view all the answers

    What is the main purpose of the condensate tank in the steam cycle?

    <p>To store and reuse pure condensate</p> Signup and view all the answers

    Why is water an ideal heat transfer fluid?

    <p>Because it has a high specific heat capacity</p> Signup and view all the answers

    What is the primary duty of Power Engineers in relation to steam?

    <p>To ensure safe and efficient operation of steam systems</p> Signup and view all the answers

    Which component of the steam system prevents steam from flowing unimpeded through the heater?

    <p>Steam trap</p> Signup and view all the answers

    What would happen if the heater did not have a steam trap?

    <p>Steam would flow through the heater unimpeded</p> Signup and view all the answers

    What is the purpose of the condensate tank in the steam cycle?

    <p>To separate condensate from steam</p> Signup and view all the answers

    What would happen if the steam in the heater did not spend enough time in the heat exchanger to give up heat and condense?

    <p>Steam would vent to atmosphere wasting heat, water, and chemicals</p> Signup and view all the answers

    What is the main difference between the basic system described in the text and most process steam systems?

    <p>All of the above</p> Signup and view all the answers

    Study Notes

    Steam and Its Applications

    • Power Engineers produce steam for energy generation, heating, and as a thermal transport medium in various industrial processes.
    • Steam is used extensively in industries such as food processing, chemical manufacturing, and paper production for efficient heat transfer.
    • The tanning industry utilizes steam for controlling temperatures in the leather treatment process, ensuring effective tanning.
    • Steam acts as a powerful heat transfer fluid due to its high latent heat, allowing it to transfer large amounts of energy with minimal temperature change.

    Characteristics of Heat Transfer Fluids

    • A good heat transfer fluid should have high thermal conductivity, low viscosity, and stability at various temperatures.
    • Water is considered an ideal heat transfer fluid due to its high specific heat capacity, non-toxicity, and abundance.
    • Steam has unique properties including high energy content and the ability to transfer heat without a significant increase in temperature.
    • The volume ratio of steam to water at 100 degrees Celsius is approximately 1,600:1, highlighting steam's expansion capabilities.

    Steam Systems and Equipment

    • In a unit heater, steam releases its latent heat to the surroundings, condensing back to water while providing thermal energy.
    • Superheated steam typically exists at temperatures above 100 degrees Celsius and is utilized in applications requiring higher thermal energy.
    • A steam trap is essential in a heater, allowing condensate to exit while preventing steam loss, optimizing energy efficiency.
    • If a heater lacks a steam trap, steam would escape without condensing, resulting in energy loss and reduced heating effectiveness.
    • The condensate tank collects condensate, which can be reused in the steam cycle, conserving water and energy.

    Industrial Uses and Limitations of Steam

    • The oil industry injects steam below ground to enhance oil recovery, reducing viscosity and improving flow rates.
    • Some sectors, like electronics manufacturing, do not utilize steam as a heat transfer medium, opting for alternative methods.
    • The main purpose of the condensate tank is to manage the return of condensate to the boiler, sustaining the steam cycle.

    Differences Between Industrial and Domestic Steam Use

    • Industrial steam use focuses on large-scale, continuous processes, while home applications often involve batch heating, such as cooking or heating water.
    • The basic steam system described may differ from typical process systems in terms of scale, complexity, and the levels of automation involved.

    Challenges and Considerations

    • Insufficient residence time in a heat exchanger leads to incomplete heat transfer, meaning steam may not fully condense, affecting heating efficiency.
    • Understanding the purpose and operations of components within steam systems is crucial for optimizing performance and safety.
    • Power Engineers monitor and maintain steam systems, ensuring their efficiency and reliability across various industrial applications.

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    Description

    Test your knowledge on steam, its uses, and the basic steam cycle in power engineering. Learn why steam is important and how power engineers control the equipment that produces and consumes it.

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