Calculation examples
Example point X
High temperature rise, low water flow application, e.g. pre-heating of boiler feed water in open circuit:
• Compressor unit: GA160-50Hz
• Working pressure: 14 bar / 200 psi
• Water flow: 0.6 l/s / 1.27 cfm
• Water inlet temperature: 36°C / 97 °F
• Water outlet temperature: 90 °C / 194 °F
The formula to calculate the amount of recovered energy results in (2):
• 4.2 x 0.6 x (90 - 36) = 136 kW ( ± as indicated on the curve)
The outlet temperature for a water flow of 0.6 l/s can be calculated backwards from formula (2):
• Toutlet = 36 + (136 / (4.2 x 0.6)) = 90 °C
Total pressure drop on waterside is (1):
• pd = (4.23 x 0.6²) + (1.62 x 0.6) = 2.5 kPa = 25 mbar
Example point Y
Low temperature rise, high water flow application, e.g. central heating in closed circuit:
• Compressor unit: GA160-50Hz
• Working pressure: 14 bar / 200 psi
• Water flow: 4 l/s / 0.87 cfm
• Water inlet temperature: 55.8°C / 132.4 °F
• Water outlet temperature: 64.2 °C / 147.6 °F
The formula to calculate the amount of recovered energy results in (2):
• 4.2 x 4 x (64.2-55.8) = 141 kW ( ± as indicated on the curve of 85°C)
The outlet temperatures for a water flow of 6 l/s can be calculated backwards from formula (2):
Instruction book
24 2920 1728 05
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