Ceramic-Core Heat and Cold Recovery
A brief introduction to ceramic-core heat and cold recovery, along with the requirements placed on the ceramic core.
Ceramic-Core Heat and Cold Recovery
Ceramic-core heat recovery systems leverage the high specific heat capacity and thermal conductivity of ceramic materials to facilitate energy exchange between exhaust air and fresh air—whether in bidirectional fresh air systems or industrial waste heat recovery applications—thereby reducing energy consumption for air conditioning and heating.
Working Principle
Heat Absorption Phase: Indoor exhaust air flows through the ceramic core, and its thermal energy is absorbed and stored by the ceramic material.
Heat Release Phase: Outdoor fresh air flows through the ceramic core in the reverse direction; it is heated in the process before being delivered indoors.
Material Requirements for Ceramic Cores
Performance Parameters | Requirements | Description |
Specific Heat Capacity | ≥0.8 J/g·K | High heat storage capacity and efficiency |
Thermal Conductivity | 1.5-10 W/m·K | Moderate range to ensure efficient heat storage and release rates |
Coefficient of Thermal Expansion | ≤3×10⁻⁶/℃ | Resistant to thermal shock; prevents cracking |
Compressive Strength | ≥10 MPa | Withstands installation stresses and airflow impact |
Structural Requirements for Ceramic Cores
Structural Parameters | Typical Range | Description |
Cell Density | 100-400 cpsi | High cell density provides a large heat exchange surface area but results in high airflow resistance. |
Wall Thickness | 0.2-1.0 mm | Thin walls facilitate rapid heat exchange; thick walls offer strong heat storage capacity. |
Porosity | 50%-70% | Influences airflow resistance and heat exchange surface area. |
Shape | Cylindrical, Square | Selected based on the shape of the air duct. |
Sealing | Must be Effective | Prevents airflow short-circuiting, which would reduce efficiency. |
Selection Guidelines
By Heat Recovery Type: For sensible heat recovery only, select a ceramic core; for humidity recovery, select a total heat exchange membrane or a combination of both.
By Operating Temperature: For ambient temperature conditions, select Cordierite; for high-temperature conditions, select Silicon Carbide or Corundum-Mullite.
By Airflow Volume: For high airflow volumes, select a low pore density with larger channels; for low airflow volumes, a high pore density is suitable.
By Maintenance Conditions: If on-site maintenance is convenient, select a ceramic core (which is washable); if maintenance is difficult, select a total heat exchange membrane.
By Cost Budget: If initial investment cost is a primary concern, select a total heat exchange membrane; if long-term operating cost is the priority, select a ceramic core.
Summary
Ceramic-core heat and cold recovery systems primarily rely on sensible heat exchange, achieving efficiencies ranging from 60% to 80%. They are widely utilized in building ventilation systems and for industrial waste heat recovery. Cordierite is the preferred material in the construction sector, while silicon carbide is best suited for applications requiring rapid heat exchange. Material properties, channel structure, and maintenance requirements must be comprehensively evaluated during the selection process to achieve an optimal balance between efficiency and airflow resistance. We are a manufacturer of industrial ceramics based in China; for further information, please contact us via email at annayu@169chem.net or via WhatsApp at +8618909016373.