The hot water circulator pump is a key element in heating systems with forced circulation and causes the coolant to move within the system, which is especially important for homes with more than one floor with an extensive system of distributing pipes. Coolant circulation pump helps to overcome resistance in the pipe. What the pipe thickness, the less resistance and less than the required pump power.
Circulating pumps create a certain pressure difference at the installation site. The differential pressure is used to overcome the sum of all the hydraulic friction loss in pipes, that is due to a liquid is maintained in constant motion. To determine the actual pressure of the pressure drop is added to the static pressure.
When choosing a hot water circulator pump is necessary to know:
- Operating conditions (coolant temperature, a substance used as a coolant or a percentage of the solution, the diameters of the pipes).
- Performance. For hot water circulators performance can be calculated using the following formulas, in any case and it is based on the condition of maximum load.
- Head. In the selection of water pumps must take into account losses that arise in the pipeline for the resulting velocity of circulation.
Parameters of the hot water circulator pump are selected so that within an hour after it is run triple the total volume of the coolant system. Performance of a specific model is determined by the pump pressure-flow characteristics of the second pump rotation speed, with a head equal to the hydraulic resistance of the system. As a rule, due to the small circulation of the coolant velocity, the magnitude of the hydraulic resistance for a private home does not result in losses of more than 1-2 meters (0.1 – 0.2 atm). Therefore, if the calculation of hydraulic resistance is problematic, then the performance of a particular pump model is recommended to determine the midpoint of its pressure characteristics.
Grundfos UP Series Product Guide (pdf)
Grundfos UP15-10SU7P/TLC (595916) Installation Manual
Grundfos UP15-10SU7P/TLC (595916) Secondary Installation Manual
