Mechanical Science Heat Exchangers

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Author:
ereim
ID:
28729
Filename:
Mechanical Science Heat Exchangers
Updated:
2010-08-06 12:38:29
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Heat Exchangers
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Chapter 3
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  1. A heat exchanger that condenses vapor into liquid
    Condenser
  2. The process of heat transfer between interacting adjacent molecules of the material through which the heat is being transferred.
    Conduction
  3. The transfer of heat by a process of bulk motion and mixing of macroscopic portions of a fluid
    Convection
  4. A flow pattern in a surface heat exchanger in which two fluids flow in opposite directions; also called reverse flow.
    Counter flow
  5. A flow pattern in a surface heat exchanger in which one fluid flows at right angles to another fluid.
    Cross flow
  6. A heat exchanger in which two fluids come in contact and mix with each other.
    Direct contact heat exchanger
  7. A heat exchanger that functions to pre-heat feedwater prior to the reactor
    Feedwater heater
  8. A device that is designed to transfer heat from one fluid to another
    Heat exchanger
  9. A heat exchanger in which the two fluids are separated by a solid surface; also called a surface heat exchanger
    Indirect contact heat exchanger
  10. The change in enthalpy required for a substance at a given pressure and temperature to change from a vapor to a liquid.
    Latent heat of condensation
  11. A flow pattern in surface heat exchangers in which two fluids flow in the same direction.
    Parallel flow
  12. A flow pattern in a surface heat exchanger in which two fluids flow in opposite directions; also called counter flow.
    Reverse flow
  13. Heat which results in a temperature increase in the substance to which it is added
    Sensible heat
  14. The outer casing of a heat exchanger
    Shell
  15. A type of surface heat exchanger that uses tubes and tube sheets to separate the two fluids in the shell.
    Shell and tube heat exchanger
  16. The fluid that flows around the outside of the tubes of a shell and tube heat exchanger.
    Shell side fluid
  17. A change in temperature that induces excessive thermal stress on heat exchanger components.
    Thermal shock
  18. The fluid in a shell and tube heat exchanger that flows through the tubes.
    Tube side fluid
  19. A mechanical device used to remove non-condensable gas from a condenser.
    Vacuum pump (Hogger)
  20. A condition that occurs when the velocity of a fluid suddenly changes and impacts on pipe bends or component restrictions.
    Water hammer
  21. STATE the two types of heat exchanger construction.
    • surface (non-mixing)
    • direct contact (mixing)
  22. LIST at least three applications of heat exchangers
    • Feedwater heaters
    • condenser
    • Evaporators
  23. Single-pass versus multi-pass heat exchangers.
    • Single pass has only one path for the shell and the tube
    • Multi Pass has multi pass for either the tube or shell or both
  24. Regenerative versus non-regenerative heat exchangers
    • A regenerative heat exchanger is one in which the same fluid is used as the
    • cooling fluid and the cooled fluid.

    • In a Non-Regenerative Heat Exchanger (NRHX), the hot fluid
    • is cooled by a colder fluid, which is supplied by another system where the heat
    • is eventually transferred to a heat sink.
  25. STATE precautions associated with startup and shutdown of heat exchangers
    • Cold side should also be filled and vented before adding the hot side during startup
    • During shutdown the hot side should be removed first and then the cold

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