Introduction to Exhaust Fans : Heat Recovery/Leak Detection System

 Heat Recovery Systems:

  • Function as emergency recovery ventilation systems.

  • Exhaust air, though unsuitable for human comfort, may still contain heat energy.

  • Heat recovery systems use this residual heat instead of disposing of it.

Types of Heat Recovery Systems:

  • Rotary Thermal Wheels:

    • Compact, suitable for large sizes, low pressure drop.

  • Heat Pipes:

    • Fan location is not critical, no moving parts except the tilt.

  • Fixed Plate Heat Exchangers:

    • Easily cleaned, no moving parts.

  • Runaround Systems:

    • Allows separation of exhaust airstream from supply air.

Operational Considerations:

  • Not used when no heat is needed (e.g., during cooling mode).

  • May be legally required as an energy-saving and climate-friendly measure.

Refrigerant Leak Detection Systems:

  • Essential for systems that use refrigerants, which can be harmful if leaked.

  • Purpose: Control unintended emissions and prevent dangerous situations.

  • Installed to detect and eliminate refrigerant leaks.

Functionality:

  • Uses sensors to detect refrigerant leaks.

  • Contains audible and visual alarms to alert of leaks.

  • Activates exhaust fan to remove noxious gas and prevent accumulation.

  • Notifies the team of a leak to enable quick identification and repair.


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