Dear seniors, please help me figure out what the problem is – it’s an issue with cooling after the board replacement
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Plate heat exchanger model: BR03B. Number of plates: 172. Heat exchange area: 50 square meters. Inlet temperature of the cooling water: 7 degrees Celsius; outlet temperature: 11 degrees Celsius. Flow rate: 40 tons/h (the cooled water is discarded directly). Inlet temperature of the heating water: 19 degrees Celsius; outlet temperature: 17 degrees Celsius. Flow rate: 80 tons/h (for central air conditioning systems). Single-pass system. The flow velocity inside the plate heat exchanger is unknown. The outlet temperature of 17 degrees Celsius is not sufficient; at least 15 degrees Celsius is required. The cooling water inflow and outflow rate is 40 tons/h, while the heat exchange water inflow and outflow rate is 80 tons/h – these values cannot be changed. Please help me, experienced colleagues; what methods can be used to reduce the outlet water temperature to below 15 degrees? Should we increase the plate heat exchangers, change the process, or are there other methods? I would like to thank all the seniors here first. This post was last edited by bodian on 2009-2-4 at 11:53.]
The fluid flows in pure counterflow mode to increase the heat exchange area, ensuring that the outlet temperature of the cooling water is above 15 degrees. At the same time, the heat exchanger is insulated to reduce cold source losses. Only in this way can we barely meet your requirements. This will also reduce the outlet pressure, and measures need to be taken.
Adopt the counter-current method; can we add more steps to the process?
With counterflow, the process combination requires at least 2 processes. Because you are currently using a single flow process, the flow velocity between the plates is too low, preventing turbulence from occurring; in other words, the design standards are not met. Based on the parameters you provided, I’ve done the calculations; it’s best to use 19 degrees for process 2 here, and process 3 for well water. Anyway, a single process definitely won’t work