Comparing Sensible-only and Enthalpy Plate Heat Exchangers
How do sensible-only and enthalpy plate heat exchangers compare?
Sensible-Only Plate Heat Exchanger
A sensible-only plate heat exchanger is designed to transfer sensible heat (temperature) between two air streams without any moisture transfer. It consists of plates with alternating hot and cold air channels separated by thin walls. The heat transfer occurs through conduction across these walls, allowing the temperature of one air stream to be increased while the temperature of the other is decreased, and vice versa.
Enthalpy Plate Heat Exchanger
An enthalpy plate heat exchanger, also known as a total heat exchanger, is designed to transfer both sensible heat and latent heat (moisture) between two air streams. It includes plates with alternating hot and cold air channels, like the sensible-only plate heat exchanger. However, the plates also incorporate a special membrane to facilitate the transfer of moisture between the air paths.
Advantages of Sensible-Only Plate Heat Exchangers
Simplicity: Sensible-only plate heat exchangers have a simpler design compared to enthalpy plate heat exchangers. They do not require the addition of a desiccant or hygroscopic material, resulting in lower complexity and lower cost.
Reduced Maintenance: Sensible-only plate heat exchangers do not involve the handling or maintenance of a desiccant material. This can reduce the frequency of maintenance requirements and potentially extend the operational life of the heat exchanger.
Advantages of Enthalpy Plate Heat Exchangers
Moisture Transfer: Enthalpy plate heat exchangers allow for the transfer of both sensible heat and latent heat (moisture). This enables better humidity control in HVAC systems, as the moisture from one air stream can be transferred to the other, reducing the need for additional humidification or dehumidification equipment.
Energy Efficiency: By transferring both sensible and latent heat, enthalpy plate heat exchangers can improve the overall energy efficiency of HVAC systems. The recovered heat and moisture from the exhaust air can be utilized to precondition the incoming air, reducing the load on heating or cooling equipment and resulting in energy savings.
The choice between a sensible-only plate heat exchanger and an enthalpy plate heat exchanger depends on the specific requirements of the application. If humidity control is not a significant concern, a sensible-only plate heat exchanger may be sufficient and offer simplicity and lower maintenance. However, if humidity control is important or energy efficiency is a priority, an enthalpy plate heat exchanger would be preferred due to its ability to transfer both sensible heat and moisture.
