A two-node heat and mass transfer network model for long-term simulation of void space of high-rise apartment houses equipped with gas-fired boilers

A simplified model was developed by use of thermal-ventilation network with the purpose of studying air environment in void space at the central portion of high-rise apartment houses when gas-fired boilers were installed in the void. First, a one-node model was studied assuming uniform temperature distribution in the void space, resulting mismatching between calculated and measured values for building surface temperature. Then, a two-node model was prepared by separating corridor region from void region. The changes of values by the two-node model were confirmed to be closer to the measured values for the building surface temperature. Finally, by using the two-node model, long-term simulation study was performed for 9 years on high-rise apartment houses in suburban area of Tokyo, Japan, and the conditions to produce high CO₂ concentration that relates closely to residents' health and normal burning conditions for the boilers were extracted.