a. No Heat Recovery: No measures for the implementation of the heat recovery                system for the proposed building.
       b. Run Around Coils, No Pipes: Heat exchanger positioned within the supply and               exhaust air streams of an Air Handling Unit (AHU) to recover the heat.
       c. Heat-Pipes: Heat pipe coils are charged with volatile refrigerant and has an                    evaporating and a condensing end which facilitates the heat transfer.
       d. Sensible or Enthalpy Wheels: Enthalpy is coated with desiccant material and               rotated between fresh air and exhaust air to exchange heat and moisture.

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