ENGLISH-121
0
3
O
THERS
3. Ground heat exchanger circulation water (anti-freeze) usage standard (mandatory checklist)
When using ground heat source, use anti-freeze to manage the freezing point. If you do not use anti-freeze, it will cause the
pipes to freeze and burst. Note that the manufacturer does not take responsibility for any damage caused.
1) All the circulating water (anti-freeze) and additives (corrosion inhibitor, bacteria inhibitor, foam inhibitors) must
be used after consulting with the business ordering party or supervisor for its impact on environment, toxicity,
corrosiveness, harmfulness to human and management plan.
2) Contractor must take extra care regarding on handling, packaging and transporting regulations and procedure of the
anti-freeze.
3) Do not use the anti-freeze that is harmful to humans or equipment. In addition, anti-freeze must be injected to the
pipe according to specification and concentration level that is actually required by system. (Do not directly inject
undiluted solution, consult business ordering party or supervisor when undiluted solution was brought to the site)
4) Before injecting the anti-freeze, evacuate any air that may remain in the system and apply pressure to check for
leakage.
5) User must monitor and manage periodically to maintain initially designed concentration level of the anti-freeze.
If the concentration level decrease due to leakage or over certain period of time, it may cause due to pipe to freeze
and burst.
6) Usage condition of the anti-freeze when ground heat exchanger is installed (mandatory)
- Flash point: Flash point of the anti-freeze must be over 90 °C (194 °F).
- Biochemical oxygen demand: Amount of oxygen in 1 g of anti-freeze at 10 °C must be within 0.1 ~ 0.2 g and this
value must be maintained for 5 days.
- Freezing point: Maintain concentration level of the anti-freeze so that freezing point of the anti-freeze complies to
the setting of the option switch (K21/K22).
- Toxicity: LD50 per each 1 kg of anti-freeze must be less than 5 g.
- Storage stability: It must not be separate when heated or cooled, and also turbidity should not be increased.
- Corrosion resistance: It must be corrosion resistant to all the metallic material used for ground heat pumps and
pipes.
- Scale: Scale that has been accumulated on the plate type heat exchanger for one year of performance should not
cause performance decrease over 15 %.
4. Standard data for status of Anti-freeze [Based on temperature of anti-freeze at 15 °C (59 °F)]
Type of anti-freeze [Based on
15 °C (59 °F)]
Concentration [% Wt.]
Freezing temperature
Density
°C
°F
kg/m
3
lb/ft
3
Methanol
10
-5.6
21.9
983.60
61.4
20
-11.7
10.9
975.60
60.9
Ethanol
10
-3.9
25.0
983.60
61.4
20
-8.3
17.1
972.40
60.7
Ethylene glycol
10
-3.2
26.2
1014.87
63.4
20
-7.8
18.0
1031.39
64.4
30
-14.1
6.6
1047.07
65.4
40
-22.3
-8.1
1061.65
66.3
Propylene glycol
10
-3.3
26.1
1009.75
63.0
20
-7.1
19.2
1020.91
63.7
30
-12.7
9.1
1030.51
64.3
40
-21.1
-6.0
1038.65
64.8
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