Скачать или смотреть AAON RND cabinet package DX rooftop unit with energy recovery wheel | HVAC total enthalpy wheels 

Here is a walk through of an energy recovery wheel on an AAON RND cabinet. This unit happens to be a 50 ton water source heat pump.

A total enthalpy wheel in a packaged DX unit works by transferring both sensible heat (temperature) and latent heat (moisture) between two airstreams: the exhaust air and the supply air.

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Here's how it works:

The wheel: The core of the system is a slowly rotating wheel made of a desiccant material, such as silica gel or zeolite. This material has the ability to adsorb and release both moisture and heat.

Summer operation:

Return Air / Exhaust air: As the exhaust air (relatively dry and cool) passes through one side of the wheel, it picks up moisture and heat that the wheel adsorbed from the supply air.

Rotation: The wheel continuously rotates, exposing the other side to the supply air (incoming outdoor air).

Outdoor Air / Supply Air: The desiccant, which was “dried and cooled” by the return air, adsorbs moisture and heat from the outdoor air, pre-conditioning it for more efficient cooling by the DX unit.

DX unit: Depending on the season and temperature requirements, the DX unit will either heat or cool the supply air further to achieve the desired comfort level inside the building.

Benefits of using a total enthalpy wheel in a packaged DX unit:

Reduced energy consumption: By pre-conditioning the supply air, the total enthalpy wheel reduces the load on the DX unit, leading to significant energy savings.

Compact design: Total enthalpy wheels are typically integrated into packaged DX units, making them a space-saving solution.

Things to consider:

Maintenance: The wheel requires periodic cleaning and maintenance to ensure optimal performance.

Initial cost: The initial cost of a packaged DX unit with a total enthalpy wheel may be higher than a unit without one. However, the energy savings can often offset the higher initial cost over time.

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