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Basic Airflow Principles

Modes of Heat Transfer

  • Conduction: heat flows from higher temperature region to a lower temperature. This occurs in solid, liquid or gaseous mediums that make physical contact
  • Convection: the combined action of conduction, energy storage and mixing motion
  • Radiation: heat flows from a higher temperature to a lower temperature when bodies are separated in space
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    Pros

    Cons

    Free Convection

    Low cost

    High reliability

    Low noise

    Poor cooling capacity

    Conduction (heat sinks)

    Low cost

    Limited cooling capacity

    Forced Convection (fans)

    Moderate to good cooling

    Medium/high cost

    Noise

    Reliability

    Refrigeration

    High cooling capacity

    High cost

    Reliability

    Maintainability

    Size