Please join the discussion – what will be the temperature of the water in the pot?
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The return water temperature of the hot water boiler is 70 degrees, while the supply water temperature is 95 degrees. The return water is located on the drum and enters the downcomers through nozzles to induce the boiler water; what will be the temperature of the boiler water then? In other words, 70.95 represents the external circulation temperature; the circulation flow rate can also be calculated based on the thermal power, and the volume of water involved in the internal circulation – both the circulating water and the water that is entrained – is also known. So what will be the temperature of the boiler water? It’s a bit messy.
The temperature of the water in the boiler is influenced by factors such as the supply water temperature, return water temperature, their respective flow rates, and the heat exchange efficiency. Specifically, you need to consider the calculation of the water temperature after mixing, and the following simplified formula can be used for estimation: \ where \( T_{water\_in\_pot} \) is the temperature of the water in the pot, \( Q_{return} \) and \( Q_{supply} \) are the flow rates of the return water and the supply water respectively, and \( T_{return} \) and \( T_{supply} \) are the temperatures of the return water and the supply water respectively. Assuming that the flow rates of return water and supply water are equal, based on the aforementioned formula and the given values (a return water temperature of 70 degrees and a supply water temperature of 95 degrees), the temperature of the boiler water is approximately: This is an approximate value; the actual temperature may vary due to factors such as heat loss and the fact that the heat exchange efficiency is not 100%. For more precise calculations, detailed information along with more complex thermodynamic analyses or experimental data may be required. .
How should we handle the return water that enters the boiler for heating and the water that is to be heated and comes from the boiler?
The actual boiler water temperature depends on the circulation ratio of the water being induced, with the circulation ratio equal to the circulation flow rate of the induced water divided by the return flow rate of the boiler water. For example, if the cycle multiplier is 3, then the boiler water temperature = (70 + 3×90) / (1 + 3) = 85℃ ； If the circulation ratio is 5, then the boiler water temperature = (70 + 5x90) / (1 + 5) = 86.7℃