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.                            Generally, it refers to any intermediate stream used to transfer heat between                 two streams that are not directly connected for reasons of safety and                             practicality. When the exhaust air systems are used throughout the day, it                       makes sense to select run around coils as the heat recovery type.
       c. Heat-Pipes: The constant circulation of evaporating and condensing of the                    working fluid is the principle of the heat pipes heat transfer. It is a vacuum tight              device consisting of an envelope, a working fluid, and a wick structure.  Heat                pipes can transfer heat with minimal temperature difference between one end              and the other.
       d. Loading Cold with Air Conditioning: The Loading cold with air conditioning is                the basic form of Heat Recovery Ventilator which consist two ventilation ducts              running next to one another passing between the inside and the outside of the            house. One carries cool, fresh air in and the other carries stale air out. These                air streams run through the heat exchanger to transfer heat from outgoing air to            incoming air.
       e. Sensible or Enthalpy Wheels: The enthalpy wheel utilizes the heat in an                         exhaust ventilation process to preheat make-up air to reduce the required                     heat load of the system. The wheel is placed into a make-up air or air handling              unit to capture the heat from the exhaust air and transfer it to the supply air.

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