Primary energy savings

For the different row houses in Zurich's climate, the space heating demand (see Figure 9.4.8) and primary energy savings were calculated (see Figure 9.4.9).

The lower the space heating demand, the higher the specific primary energy demand per kWh heating. For the reference house, a low temperature gas heating system with radiators was assumed; for the passive house standard, a heat pump mainly heating warm water and air was assumed. Since the tool used was a German tool (PHPP), the conversion factor for electricity is for the German energy mix. If the primary energy savings are related to the gross area of solar wall heating, this results in primary energy savings from 50 to 200 kWh (see Figure 9.4.9). It has to be kept in mind that the solar

Source: Fachverband TWD e.V. Gundelfingen, Germany

Figure 9.4.8 Yearly space heating demand for different building standards and variable solar wall heating design (Zurich climate)

solar solar no SWH 5m2 SWH 10m2 SWH 15m2SWH

insulation lnsulation2

solar solar no SWH 5m2 SWH 10m2 SWH 15m2SWH

insulation lnsulation2

Source: Fachverband TWD e.V. Gundelfingen, Germany

Figure 9.4.8 Yearly space heating demand for different building standards and variable solar wall heating design (Zurich climate)

wall was oriented to the south and shading from surrounding buildings was assumed to be minimal for windows and walls. It is obvious that for passive houses, the savings are much smaller than for houses without ventilation heat recovery.

Source: Fachverband TWD e.V. Gundelfingen, Germany

Figure 9.4.9 Primary energy savings per gross area solar wall heating for the climate of Zurich and for different building insulation levels

Source: Fachverband TWD e.V. Gundelfingen, Germany

Figure 9.4.9 Primary energy savings per gross area solar wall heating for the climate of Zurich and for different building insulation levels

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