Heat exchanger design
Thread Content
Design a horizontal shell-and-tube steam-water heater with water in the tube and steam condensed outside the tube. The mass flow rate of water is 3.5kg/s, and it is required to be heated from 60°C to 90°C. The heating steam is dry saturated steam with an absolute pressure of 1.6×105Pa, and the condensed water is saturated water. The outer diameter of the heat exchanger tube is 19mm and the thickness of the brass tube is 1mm. The water side fouling thermal resistance is 1.7×10-4m2·K/W, and the water side resistance loss is required to be less than 0.3×105Pa.
Heat exchange area = heat transfer amount/(heat transfer coefficient x logarithmic average temperature difference)
It is simpler, less troublesome and energy-saving to insert the steam pipe directly into the water for heating, unless there are special process requirements.
Calculate the heat transfer area F=Q/(K* K1 * Δtm) Among them, Q-heat transfer amount MW K—heat transfer coefficient W/㎡·℃ Δtm—logarithmic average temperature difference K1—coefficient that affects heat transfer efficiency due to uneven distribution of dirt and heat medium (taken from 0.85~0.9)
Does inserting a steam pipe into water save energy, or inserting a water pipe into steam saves energy?
What is the main point of your post?
This is still feasible, but be careful about water hammer.