Comprehensive utilization of circulating water
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The current circulating water system has a return water pressure of 0.14 MPa and is equipped with 3 cooling towers. There is a proposal to use the backflow pressure to drive a circulation water pump in order to reduce electricity consumption. Is this idea feasible? (In summer, the temperature of the circulation water is high, so it must be cooled in a cooling tower; in winter, only one pump needs to be used, with the excess water being used to drive the water pump via a turbine.) ）
This post was last edited by 3983596_FPPZ on 2019-2-22 at 14:32. The energy available from water is too low to be of any practical use. From the perspective of energy conversion, when water energy is converted into mechanical energy, the efficiency is around 60%-80%. So, just how much energy does 0.14 MPa represent, and how much of it can be converted into mechanical energy?
A few years ago, we installed a cooling tower that was driven by a water turbine; it didn’t use electricity, and its power output was around 40 kW. What I’m thinking is that since there are devices of this kind, why not carry out integration work? Although the amount of energy recovered isn’t much, small amounts add up over time. It’s a shame to waste water pressure by not using cooling towers in winter. What do you think?
Turbine renovation addresses the energy loss of the drive pump motor at its source. If the height of the device you produce is indeed high and such high pressure is required for circulation, it is more economical to use hydraulic drive, as the excess head in this return water cannot be eliminated. (What is the maximum elevation for the circulating water usage?) ) If it is because a water pump with a too-high head was selected during design, a more energy-efficient and straightforward approach is to reselect the water pump based on the actual operating conditions. It can reduce the efficiency losses of various devices in the process.
The preliminary work for upgrading the high head of the water pump has been completed; the aim is to utilize the excess head available in winter to carry out some energy-saving measures
Is it only driven by residual pressure during winter? In winter, mechanical ventilation is usually turned off or used less; if the operating conditions permit, it’s certainly a good idea to use some of the residual pressure as a substitute. It is only necessary to ensure proper data support for the technical renovation project plans and investment evaluations.