Steam heating issues
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1\ Who knows how many tons of water can be heated from 20°C to 80°C using steam with an instantaneous flow rate of 30 tons and a capacity of 16.2 T/H? Thank you. 2\ What is the final temperature when 65°C water and 80°C water are mixed in a 9:1 ratio? How is this calculated? I forgot what we learned in school
The owner also didn’t specify what grade the steam is; how can it be calculated? Steam and vapor are not exactly the same thing. As for such a simple question, the original poster can find the answer by looking up books on chemical engineering principles
Perform a heat balance, that is, the heat provided by the steam should be equal to the heat absorbed by the water, plus 5–10% for heat losses.
For the first question, it is necessary to know the temperature and pressure of the steam, as well as how heat exchange takes place. For the second question, (65*9+80*1)/10=66.5 degrees
For an accurate calculation, it is necessary to know the enthalpy value at the steam inlet and the enthalpy value at the outlet; the enthalpy difference along with the heat transfer losses can then be used to determine it. However, in practical production, it is estimated that 1 t/h of steam can raise the temperature of 500 t/h of water by 1 degree.
Hehe, the views of the two people above are quite correct. I’ll explain a bit more to help the original poster understand. The heat load Q is given by Q = C * M * T, where C is the specific heat at constant pressure, M is the mass flow rate, and T is the temperature difference. Generally, the specific heat at constant pressure for water is around 4.17 kJ/kg·K, while the latent heat of steam is approximately 2200 kJ/kg. In its liquid state, water has little variation in either density or specific heat. So when the two are combined, the equation can be 9(X-65) = (80-X), which is the formula for floor 4. The sensible heat of steam is 2200, which is approximately equal to 500*4.17*1; this is why, as mentioned on the 5th floor, 1 t/h of steam is sufficient to raise the temperature of 500 t/h of water by 1 degree