Anne Haas 1111 Concept

The low heating power needed by high-performance housing can be covered by using the supply air of a balanced mechanical ventilation system to deliver needed heat. This dual function - delivering fresh air and heat with the same system - is economical. Eliminating a separate heat distribution system is a big saving.

This does require some careful engineering. The air flow rates of the mechanical ventilation system are specified to ensure good indoor air quality. At the same time, the air flow rate must be adequate to deliver the needed heating power for design conditions. Ventilation losses occur between the heat exchanger (HE) and the room air outlet. Therefore, the heating power supplied by the air must exceed the demand of the rooms (see Figure 11.1.1). Some of the heat lost from the ducts may be 'lost' into rooms along the duct path, as well as in the room being heated.

Notes:

pHE, The: heat transfer of heat exchanger (HE) (including ground heat exchanger, if present) and supply air temperature after HE (and fan).

ph, Tsup: heating power of air heater and supply air temperature. pv: part of heating power ph needed to compensate ventilation losses. pr, Tr: heat released in room to compensate for transmission and infiltration losses, pr= ph - pv, and room air temperature.

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

Figure 11.1.1 Heat delivery and heating power

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