Master's Thesis Tim Ebeling

 

Modeling and thermodynamic simulation of a Novel Heat Recovery Fan Unit with focus on maximum temperature efficiency”

The present paper focuses on the development and ener-getic evaluation of a Novel Heat Recovery Fan Unit which combines components of heat recovery and pres-sure generation in order to reduce the electrical energy demand as well as the number of components to increase the system compactness and the heat recovery rate.
Firstly, heat recovery efficiency rate and air-side pressure drop are investigated with the ε-NTU0 procedure and CFD analyses in order to evaluate the performance of the unit. Both methods are oriented to a parameter study of a defined reference status which is based on realistic application conditions. In order to calculate the amount of energy actually recovered energy balances consider the electrical energy demand.
Secondly, the pressure loss and the heat recovery rate of a counter-flow regenerator are focused. Therefore, the unit is compared to a system, which represents the state of the art.
In respect to the motivation for the chosen heat re-covery approach, neither the heat recovery grades nor the system compactness could be increased compared to the counter-flow regenerator. Moreover, heat recovery effi-ciency rates greater 50 % are not achieved in any test regarding the present configuration.