30 May 2005
Recently, new integrated heat pump systems for High Performance Houses were developed by
the Fraunhofer ISE in Freiburg-Germany. These buildings are constructed with a very thick thermal
insulation, three glazing windows and are equipped with a ventilation system with air-to-air heat recovery.
They feature an annual heating demand as little as 15 kWh/m² and a thermal peak load of 10
W/m². Thousands of these new buildings have been erected in central Europe so far .
The Compact Ventilation and Heating Device with Integrated Exhaust Air Heat Pump (CVHD) is
simultaneously used for space heating, domestic water heating and ventilation. The comparatively low
heating load of 1500 W is big enough capacity to fulfil all heating requirements.
The institute monitored and assessed these new systems in more than 30 single family houses.
The annual electricity demand for all services in these buildings equals on an average less than 17
kWh/m². For Passive Houses, this new kind of heating has reached a market share of 30% to 50% and
can be called a new „standard“. Some industrial companies are developing new units, often in cooperation
with Fraunhofer ISE.