Flow rate optimization in run-around heat recovery systems

Heat recovery technologies are used to reduce the energy use and operating costs for ventilation systems in buildings. Run-around heat commonly buildings when cross-contamination between air streams is not acceptable, with complex ducting retrofit projects space limitations. The design operation of run-around rather complex, especially variable flow rates since coupling liquid rate must be adjusted respect rate. This paper presents a mathematical model system. validated lab measurements further parametric studies evaluate how overall thermal effectiveness system influenced by different exchanger configurations, liquids conditions. Important findings suggests that highly sensitive rate, particularly designed high volumes. optimum cannot only determined as it configuration properties always found within turbulent regime.