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Maritime Geothermal Ltd.
17-Feb-00
NORDIC® Vertical EMDX - Typical Loop design
NOTE:
Layout for one borehole shown
below. Actual installation re-
quires one borehole per ton.
(I.E. (3) holes for a EMDX-45,
(4) holes for a EMDX-55 and
(5) for a EMDX-65
NOTES:
•
Drill vertical bore to a depth of 30 to 35 m.
•
Pre-assemble or construct on site the dual (9 and 13 mm) piping assem-
bly required. Seal both ends and pressurize with 1000 kPa nitrogen for
leak checking. Silver brazing a schrader valve in the end of the 9 mm
line will allow gauge checking for loss of pressure.
•
Check for leaks with soap suds. After a minimum 2 hr waiting period,
recheck the line for loss of pressure. If the
temperature
of the loop
hasn’t changed then the
pressure
should be same as it was originally.
•
Insulate both liquid lines and vapor lines from the heat pump to the well
head unless in separate horizontal trenches. Vapor lines in separate
horizontal trenches need only be insulated from 3 m out in the trench to
the basement wall. Liquid lines must be insulated from the heat pump
to approx. 1 m down the drop pipes in the vertical boreholes.
•
Install spacers to keep the pipes separated as far as possible from one
another in the boreholes.
•
Install 30 to 35 m of dual tubing (13 mm vapor & 9 mm liquid). Re-
check pressure on lines. Secure pipes through opening in borehole
head. Backfill with pea gravel to 10 m from top. Seal hole with ben-
tonite clay from 10 m to surface.
•
Most commercial installations will require tremie grouting of the bore-
hole from bottom to top with bentonite with 28 to 30% solids.
•
Install linesets from well heads in horizontal trenches to heat pump in
building. Silver braze all joints with 5% silver solder using dry nitrogen
to purge the system. When all joints are complete, pressurize the entire
system with 1000 kPa nitrogen and recheck for leaks. Vacuum until
system stays below 500 microns for five minutes after vacuum pump
has been shut off.
•
Charge the prescribed amount of refrigerant through the high side
schrader valve located on the front of the machine.
Pinch around pipes
and silver braze.
Keep pipes up 13
mm off bottom to
insure good flow.
22 mm Stub Cap (Copper)
NORDIC® DX
“Energy Module”
Heat Pump
Liquid Line
Vapor Line
35 m max.
2 m
Spacers
Insulate liquid line
to here
Trench
