jailcd2018045: "Study on the High Humidity in The Underfloor Space of Detached Houses During Summer: Examination on the Optimal Control Methods of Forced Ventilation in Underfloor Space Using Numerical Calculation"

Abstract

In a floor insulated house, forced ventilation is considered effective as a measure to improve high humidity under the floor during summer. It is considered operation control of ventilator depending on the condition of outside air humidity is better than all day ventilation. Confirm the effect of forced under-floor ventilation when the outside air humidity is used as the parameter of the ventilating fan operation control, and study optimal control method.Ventilator operation based on outside relative humidity was effective for alleviating high underfloor humidity in the entire period studied.In June, underfloor forced ventilation based on outside air humidity was effective, but from July onwards, all-day forced ventilation and ventilation based on outside air humidity showed roughly the same effects.Depending on the period, all-day forced ventilation and timebased ventilation showed adverse effects.The optimal control value for ventilator operation based on outside air humidity varies depending on the time/season, and it may also vary depending on the house and region. Accordingly, control based on the difference in humidity between outside air and underfloor air is considered to be effective.In case of ventilation, when the relative humidity of the outside air is lower than the relative humidity of the floor was effective for alleviating high underfloor humidity from July.However even if the outside air relative humidity is below the under floor relative humidity, it ventilation showed adverse effects when outside relative humidity is too high.Accordingly, control based on the difference in humidity between outside air, and control of ventilator below upper limit of ambient relative humidity underfloor air and is considered to be effective.