Outdoor air supply heating without recirculation

Air flow rates that are too high are to be avoided in this configuration because the room air can become too dry. The heating power demand of the building should not exceed 10 W/m2 to be able to supply the required heat to the rooms via the supply air. Figure 11.1.3 shows that for typical winter conditions and for an hourly air flow rate of 30m3/person, the indoor air will have approximately 40 per cent relative humidity. Depending on the living area per person, this corresponds to 0.4 to 0.2 room air changes hourly. Assumed in this calculation are mean outdoor humidities for Zurich as follows:

• a moderate internal humidity production: dx/dt = 78 g/(h.P).

In Figure 11.1.3, the left curve assumes a ventilation rate of 30 m3/P , the right curve 60 m3/P

o cc

o cc

Source: Anne Haas, EMPA 175, Duebendorf, www.empa.ch/abt175

Figure 11.1.3 Room air humidity (steady state) as a function of outdoor air change rate for two indoor temperatures and two typical outdoor humidity values

Outdoor air change rate [1/h]

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