On the page Heat Source, you can edit different data based on your system selection.

Heat Source Brine - Geothermal Probe

In a brine/water heat pump, the heat source system consists of:

• Brine (typically water with 25% glycol) which is pumped through
• Pipes with a
• Brine pump, resulting in the brine loop.

The pipes are placed in bored holes up to 400m deep as U- or coaxial pipes, and they are then known as geothermal heat probes.

U-pipes and double U-pipes can be calculated.

See more details: Designing a geothermal probe

Heat Source Brine - Geothermal Collector

The pipes are placed horizontally at one to two meters’ depth, and then they are called a geothermal collector.

The power input of the cold side of the selected heat pump is displayed.

Define the following data:

Geothermal collector: Area, laying depth, groundwater depth, resulting heat extraction rate

Brine: Rated power of the brine pump, flow rate, % glycol

Soil: Select the Soil (=ground) type. The program will display the corresponding ground characteristics: specific heat capacity, conductivity, % water

The following ground types are available:

• User-defined
• Dolomite brick
• Boulder drift / clay
• Lime rock
• Gravel / rocks, dry
• Gravel / rocks, water-saturated
• Marlstone
• Sand, humid
• Sand, dry
• Sand, water-saturated
• Sandstone
• Claystone

Or enter custom ground characteristics.

Heat Source Air

Air/water heat pumps with air as the heat source.

In an air/water heat pump, the heat source system consists of fans which generate the air stream for the vaporizer of the heat pump as well as a defrosting device.

The displayed values are characteristics of the heat pump.

Heat Source Groundwater

Define the following data:

Groundwater: Minimum and maximum temperature

Groundwater pump
The power input of the groundwater pump during continuous operation is not the same as the nominal power. During the pump’s start-up phase, it requires higher power to initiate water flow. However, after start-up, the pump’s primary task is to overcome pressure losses in the piping and the difference in water levels between the suction and injection wells, which is typically less than one meter. To ensure proper operation, it is also essential to have the nominal flow rate established.

Water/Brine intermediate loop (Brine/Water heat pumps, only): Rated power of the brine pump, temperature drop

By the way: The solar thermal collectors provide heat for the tank. They do not serve as a heat source for the heat pump.

Proceed to the next page.