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6.1 Description
In this system ground or surface water is used as a he-
at source. In the case of groundwater usage the wa-
ter is pumped out of a tap well, cooled down inside
the vaporizer and via the return well brought back in-
to the ground. It has to be ensured that the return well
is in flow direction of the groundwater downstream of
the tap well.
The heat exchange between the water and the coo-
lant happens inside the vaporizer with a stainless
steel plate heat exchanger.
To protect the vaporizer there is an automated mini-
mum temperature limit control and a water pressure
switch integrated and connected. A pressure redu-
cing valve is necessary for the operation of the water
pressure switch. (To be fitted on site, see illustration)
The enclosed flexible pipes have to be used to avoid
noise conduction. The groundwater pipes have to be
built on site.
Note:
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To avoid a blocking of the vaporizer, settle basins
have to be provided in case of high amounts of
particles inside the well water. (Sand, muck)
Flow and return pipes have to be frost protected,
with a slope towards the well.
The pipes inside the house have to be insulated
against condensing water.
A duct with electrical wires for the deep well pump
has to be placed from the tap well towards the he-
at pump.
The well cover has to be light and airtight to avoid
formation of algae and a silting of the well.
The well pump should be a deep well pump.
The well should be flushed for at least 48 hours af-
ter constructing to avoid a contamination of the
system.
6. Ground and Surface water systems
6.2 Range of Application
6.3 Accessories
Water inlet temperature
Min. water flow
Groundwater quality:
: min. +7°C!
: see chart on page 3
Following values have to be reached:
To be installed on site:
- Deep well pump with suitable pipe
- Motor protection switch for the deep well pump
- Water filter
- Water meter with gate valve
- Pressure reducing valve
- Maybe Thermometer
?
Ph-value:
6,5 - 9
Chloride:
< 100 mg/kg
Sulfate:
< 50 mg/kg
Nitrate:
< 100 mg/kg
Manganese:
< 1 mg/kg
Free Carbonic acid:
< 20 mg/kg
Ammoniac:
< 2 mg/kg
Iron:
< 2 mg/kg
Free Chloride:
< 0,5 mg/kg
Electric Conduction:
> 50 S/cm und < 600 S/cm
Oxygen
< 2mg/kg
A pump trial run for 48 hours at the end of February
and a water analysis is recommended to check the
possibility for groundwater as a heat source.
*
*
*
*If those limits are exceeded, the vaporizer and pi-
pes can get mocked up as well as the return well
can get silted.
m
m
A water meter (if required by the water authority),
otherwise blind fitting
Filter (Mash width max. 0,6mm)
galvanized, plastic
or stainless steel pipes
deep well pump,
power depends on
the depth of well
Groundwater flow direction
min. 15 m
return well, tap well
Exhaustion well
pressure reducing valve
bypass to flush the well
