• Toutlet = 55.8 + (141 / (4.2 x 4)) = 64.2°C
Total pressure drop on waterside is (1):
• pd = (4.23 x 4²) + (1.62 x 4) = 74 kPa = 0.74 bar
Example point Y for a GA VSD working at 1500 RPM, when max RPM is 3000:
dT = 90-36 = 54°C
RPM
v
= 1500
RPM
max
= 3000
dT
v
= 54 x (1500/3000) = 27 °C
Q = 4.2 x 0.6 x 27 = 68 kW
Example point Z
• Compressor unit: GA160-50Hz
• Working pressure: 14 bar / 200 psi
• Water flow: 1 l/s / 2.12 cfm
• Water inlet temperature: 60°C / 140 °F
• Water outlet temperature: 87.8°C / 190 °F
The formula to calculate the amount of recovered energy results in (2):
• 4.2 x 1 x (87.8-60) = 117 kW
The outlet temperatures for a water flow of 1 l/s can be calculated backwards from formula (2):
• Toutlet = 60 + (117 / (4.2 x 1)) = 87.8°C
Total pressure drop on waterside is (1):
• pd = (4.23 x 1²) + (1.62 x 1) = 5.85 kPa = 58.5 mbar
This proves that it is possible to work at higher temperatures, but with less heating power.
The temperature of the vessel can be set to 100°C as well. The installation can work in a higher curve,
to obtain a higher water outlet temperature. This setting must be done by a service technician of Atlas
Copco.
Example point below the lowest curve
Instruction book
2920 1728 05 25
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