CFD Prediction of CO2 level in an Appartment with Hybrid Ventilation System

conference paper

English

High energy cost is the reason why houses with low energy consumption are being developed and built. The most important parameters which should be optimized to achieve a low energy house, are the wall heat transfer coefficient and efficiency of a ventilation system. Nowadays, the attention is drawn to hybrid ventilation systems, which are a good compromise between mechanical and natural ventilation systems. The paper deals with CFD simulation of efficiency of a hybrid ventilation system in a typical 3 bedroom apartment. The parameter which is monitored as the efficiency of the ventilation system in this case is CO2 level in the apartment. The recommended value, which should not be exceeded is 1000 ppm CO2 otherwise people who are in the apartment become tired. The main source of CO2 in the apartment is production of the people. Four people are assumed to be in the apartment. Three day time variants and three night time variants are compared. Fresh air in the apartment is provided by inlet devices which are situated in each bedroom and in living room. Different air flow through the inlet devices in different variants is prescribed. Thermal comfort in the apartment is not discussed therefore simulated thermal conditions correspond with standard thermal conditions in residential buildings. The CFD model of the apartment was created and solved using the commercial code FLUENT.

hybrid ventilation, CO2 contamination, CFD

SCHOLLER, M.; HEISELBERG, P.

2006

30. 5. 2006

Chicago

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