Tap water/water vapor condensate. Heat transfer problems.
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Conditions: :hug: Vapor condensate temperature of 140°C, pressure of 0.3 Mpa, flow rate of 100 M3/h. The inlet temperature of tap water (non-desalinated water) is 10°C. Purpose: Tap water at 80–95°C is required. I have a question. 1. What type of heat exchanger should be used, as the cleaning of scale in tap water also needs to be taken into consideration. 2. Tap water production volume? Since it’s for personal investment, the lower the cost, the better: L:L:L
If cost is a concern, there’s no need to use any heat exchanger; the large tank can be used directly for mixing, and the temperature of the discharged water can be controlled by adjusting the amount of tap water used. . . . . Personal opinion, for reference only!
At 140–145°C and 0.3 Mpa, with a flow rate of 100 M3/h for the water vapor, we use circulating water for heat exchange here; I want to capture the heat from this section of water vapor. If you buy 0.6Mpa steam directly, the price won’t be cheap. What I’m thinking now is to use a large tank with coils inside it. Only the calorific value is taken, but I’m not sure if there are better methods, such as using a plate exchanger or something similar.
Plate exchangers get clogged more easily than your coiled tubes... Is the investment low?
Coiled tubes can be considered for use in creating a core-pulling mechanism
First, I would like to ask what you plan to use the heated tap water for – is it for bathing or for a hot water circulation system? If it is for bathing, it is recommended to heat it to only 50 degrees, as this allows for the use of more heat while also reducing scaling. If it is used in a hot water circulation system, the water should be soft water.
Could you explain in detail? I am planning to sell hot water for bathing. What if we use a large water tank with coils inside?
Add steam at 0.3~0.6 MPa directly into the large tank! There’s no need to worry about scaling issues; control the steam flow based on temperature.