Hot Water Boiler - Circulation Rates
Calculate boiler power and water flow relationships in imperial and SI units. Determine circulated water flow based on boiler capacity and temperature drop.
Hot Water Boiler - Circulation Rates
Boiler power and water flow - Imperial and SI-units.
The relation between:
- Boiler capacity (or power)
- Temperature drop of the water flow in a system serviced by boiler
- Circulated water flow
are indicated in the diagrams below.
Conversion Factors
Flow Rate Conversions:
- 1 gal (US)/min = 6.30888×10⁻⁵ m³/s = 0.0227 m³/h = 0.06309 dm³(liter)/s = 2.228×10⁻³ ft³/s = 0.1337 ft³/min = 0.8327 Imperial gal (UK)/min
Power Conversions:
- 1 hp (English horse power) = 745.7 W = 0.746 kW = 550 ft lb/s = 2,545 Btu/h
- 1 Btu/h = 0.293 W
- 1 kW = 3,412 Btu/h = 1.341 British hp
Example
A boiler with capacity 50 kW increases the temperature of the circulated water by 20 °C - the water flow through the boiler is 0.6 kg/s