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 the minimum 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 of 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/cold in an exhaust ventilation process to precondition the make-up air to reduce the required energy load of the system. The wheel is placed into a make- up air or air handling unit to capture the heating/cooling energy from the exhaust air and transfer it to the supply air.

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