دانلود رایگان مقاله صرفه جویی در انرژی و سیستم های تهویه عرضه منیفولد

Abstract

The total energy demand for mechanical ventilation systems depends on the pressure drop. Except for fans, any component in a mechanical ventilation system creates a pressure drop. The fan has to provide a sufficient pressure to compensate for the pressure drop caused by the components. A reduction of the energy required for ventilation is therefore a question of limiting the pressure drop in the individual components. In this study, a mechanical ventilation system incorporating a manifold with multiple fans was designed aiming at reducing the energy consumption for the main fan by decreasing the pressure drop. The key advantage of using a manifold is that it is suitable for residential buildings with limited space for air handling unit and duct-work. In this study, the use of a manifold in combination with multiple fans instead of dampers is presented. The results from the experimental studies supported the conclusion that a ventilation system with manifold and multiple fans required 40% less energy compared with a ventilation system with manifold and dampers.

5. Conclusion

A mechanical ventilation system with manifold and multiple fans has been described in the form of a mock-up in a laboratory environment and a case study of a residential building. This study confirms that by use of multiple fans instead of balancing flat plate dampers the dimensioning pressure for the main fan can be reduced and a potential for energy saving is achieved. The degree of energy saving depends on the efficiency of the multiple fans in the manifold. For the studied ventilation system, the required fan efficiency of the multiple fans in the manifold had a minimum of 48% of the efficiency of the main fan. When the multiple fans in the manifold had an efficiency of less than 48% of the efficiency of the main fan, the energy saving was negative. When the efficiency of the multiple fans was the same as the ef- ficiency of the main fan, the energy saving was 42%. The manifold supply ventilation system with multiple fans is suitable for residential buildings. The manifold requires less installation space because the flexible pipes are usually smaller in diameter than ducts in a traditional ventilation system.