Abstract
With the use of small particles, it is possible to recuperate a significant amount of waste heat. In a two-stage direct-contact heat exchanger system, particles first remove the heat from the exhaust gas, and then add the heat to the combustion air inlet stream. The primary mode of heat transfer is by convection. In high-temperature apaplications, radiative heat transfer may affect the heat exchange effectiveness. In this work, the effects of radiative heat transfer on the performance of the two stages are investigated. The model of radiative transfer employs the P1-approximation, which accounts for absorbing, emitting and isotropically scattering particles. In the particle heater unit, the results indicate that the effectiveness is reduced by up to 10%, Thus it could be important to consider this mode of energy transfer.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 121-130 |
| Number of pages | 10 |
| Journal | American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD |
| Volume | 276 |
| State | Published - Dec 1 1994 |
| Event | Proceedings of the 6th AIAA/ASME Thermophysics and Heat Transfer Conference. Part 1 (of 10) - Colorado Springs, CO, USA Duration: Jun 20 1994 → Jun 23 1994 |
All Science Journal Classification (ASJC) codes
- Mechanical Engineering
- Fluid Flow and Transfer Processes