Midea MGA-D30W/SN1 - Page 40

MCAC-2008-11 Air-cooled Modular Chiller
40
 Water Quality
The demanded quality of the water used by system is shown as follows:
The freezing point and the boiling point of the glycol liquor(The consistency of glycol for preventing
freezing)
poidometer 5 10 15 20 25 30 35 40 Liquor
Consistency%
volumenometer 4.4 8.9 13.6 18.1 22.9 27.7 32.6 37.5
freezing point ℃ -1.4 -3.2 -5.4 -7.8 -10.7 -14.1 -17.9 -22.3
boiling point(100.7kpa) ℃ 100.6 101.1 101.7 102.2 103.3 104.4 105.0 105.6
The following is the standard of water quality:
PH value:
6.5～8.0
Total rigidity: <50ppm
Conductivity: <200μV/cm (25 )℃ Sulfur hydronium: None
Chlorine hydronium: <50ppm Ammonia hydronium: None
Vitriol hydronium: <50ppm Xi: <30ppm
Iron thickness <0.3ppm Natrium hydronium: None
Calcium hydronium: <50ppm
Relationship of water quality, furring and causticity
Water quality Furring Causticity Remark
1 PH≤6 acidic water Hard Big Hard C
a
SO
4
will be built easily
2 PH≥8 acidic water Soft --------
Soft deposit with Fe
3+
&Cl
-
will be
made.
3 Water of Ca
2+
, Mg
2+
Hard -------- Hard furring will be built easily.
4 Water of Cl
-
Dirt
resultant
Very
strong
Causticity will be very strong
special for iron and copper.
5 Water of SO
4
2-
, SiO
2
2-
Hard Big
Hard C
a
SO
4
& C
a
SO
2
will be built
easily
6 Water of Fe
3+
Hard &
Dirt
l
Big
Deposit of Fe(OH)
3
& Fe
2
O
3
-
will
be made.
7 Feculent water
Dirt
resultant
Very
strong
Causticity will be very strong for
copper.
8 Organic compound of water
Dirt
resultant
-------- Furring will be built easily.
9 Water of exhaust gas -------- Big
Copper pipe will be causticized
and perforated
10 Water of plastic dust
Dirt
resultant
-------- --------
11 Water of sulfurous acid gas in atmosphere --------
Very
strong
--------
12
Water interfused by natural effects of pollution, for ex.
humidity nearby sea or hexapod body of garden belt
Dirt
resultant
Big --------