Quality of the heat receiving medium
Characteristics/content Value
pH value 7.5 – 9.0
Hardness [°dH] 0 – 20
Carbonate hardness* [°dH] <20
Chlorides (Cl) [mg/l] <100
Iron (Fe), dissolved [mg/l] <0.5
Sulphate (SO
4
) [mg/l] <100
HCO
3
/SO
4
ratio >1
Electrical conductivity [µS/cm] 10 – 800
Ammonia (NH
4
+
) [mg/l]
<1
Manganese (Mn), dissolved [mg/l] <0.1
Glycol [%] 20–40
Solids (particle size) [mm] <0.1
Bacterial count [CFU*/ml] 10,000
Suspended solids [ppm]
(portion of undissolved matter)
<20
* CFU: colony-forming units
Tab. 36 Quality of the heat receiving medium
Heat capacity
Maximum heat capacity
available
ASK 28 ASK 34 ASK 40
[kW] 13.6 16.9 19.8
[MJ/h] 49 61 71
[kcal/h] 11700 14500 17000
Tab. 37 Heat capacity (Option W2/W3)
Flow rate for heating from 45 °C to 70 °C (equates to ΔT=25K)
ASK 28 ASK 34 ASK 40
Flow rate [m
3
/h]
0.47 0.58 0.68
Pressure drop [bar] 0.15 0.15 0.15
Tab. 38 Flow rate / pressure drop (option W2)
Flow rate for heating from 15 °C to 70 °C (equates to ΔT=55K)
ASK 28 ASK 34 ASK 40
Flow rate [m
3
/h]
0.21 0.26 0.31
2 Technical Specifications
2.15 Heat recovery
16
Operating Manual Screw Compressor
ASK 901824 12 E
Option W2
Option W3
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