Discussion on the scheme of returning chilled water directly to the inlet of the circulation pump
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I’m seeking advice on how to direct the return water from the chilled water system directly into the inlet of the circulation pump, thereby capturing a pressure of 0.25 Mpa and reducing the head required by the circulation pump, with the aim of saving energy. Is the plan feasible? How to achieve it?
It’s not very scientific – the head has little to do with the inlet pressure
Why is the return water at 0.25 mppa? That’s the real question. Is it to ensure the water volume or is the return water level too high?
Place the water tank at a higher position to maintain pressure at the pump inlet
To save energy, the pump flow rate can be reduced
It is achievable, as long as the storage tank is turned into a pressure vessel (capable of withstanding a positive pressure of 0.25 MPaG)
Will it work? Will this help save energy?
It’s possible; lithium bromide chiller units work in this way. The tank is filled with nitrogen at a pressure of 0.25 MPa using pressure regulators, thereby providing a certain level of buffering capacity for the piping system. This approach is widely used in practice