T.H. Technologie Consulting Holding AG - Isomax - Terrasol

Based on the parameters specified above, the heat demand for heating purposes in a singlefamily
home is calculated as follows:
Outside walls without temperature barrier
Outside walls with temperature barrier = +18° C, WRG
Q h = 15.488 kWh/a
Q h = 4.412 kWh/a
Referred to the building useful area A N = 255 m²:
Outside walls without temperature barrier
Outside walls with temperature barrier = +18° C, WRG
Q h = 60,7 kWh/m²a
Q h = 17,3 kWh/m²a
Setting out from this calculation there can be verified that the annual heat demand for heating
of a building with Terra-Sol building technology consisting of temperature barrier and
Pipe-in-Pipe counterflow system is approximately equal to that of a passive house standard
with an annual heat demand for heating purposes of q h = 15 kWh/m².
Upon a closer look at this calculation there will be noted that the major portion of the annual
heat demand for heating purposes is attributable to the high U-value related to the quality of
windows and doors. Accordingly, a heat demand for heating purposes reduced further to
approx. 10 kWh/m² and less will be achievable when using windows and doors with a lower
U-value and applying the Terra-Sol building technology and conventional insulation thicknesses.
Herein, attention should be paid that the costs for a Terra-Sol building are lower than
those of a building of conventional construction inter alia due to the fact that great insulation
thicknesses and expensive windows with an extremely low U-value are not necessary.
4. Examples and further development
The Terra-Sol building technology has already been employed successfully in several countries
such as Luxembourg, India and China. Diagram 3 shows a series of measurements
over a period of four years with measurements of indoor temperature, outdoor temperature
and the temperature prevailing in the ground storage of a single-family home. This building
was constructed in Luxembourg in 2000 with a wall structure of light-weight concrete walls of
15 cm thickness with 7,5 cm insulation each on the inside and on the outside and with a floor
area of 175 m² in case of 1 ½ storeys. The theoretical consider-ations are confirmed in an
impressive manner by the measuring values obtained.
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