Why is the circulating water in coolers controlled at the outlet?
Thread Content
This post was last edited by reading_wyc on 2015-9-15 20:04. As the title suggests, why is this approach used? What are the advantages? What are the downsides of import controls?
Increase the pressure of the cooling water inside the heat exchanger to prevent vaporization and ensure full-flow conditions.
Export control ensures that the liquid inside the heat exchanger is fully filled, resulting in uniform heat exchange； If import control is used, it can easily result in a small volume, preventing uniform heat exchange; moreover, at high water temperatures, gasification occurs, leading to gas blockages that prevent heat exchange. This results in an increase in temperature after cooling and poses safety hazards.
Agree with the person above! :D, no score given – it’s free! Sorry!
I think it’s essentially about controlling the pressure range; you can understand it that way.
There is a limit to this; once, our company’s boiler slag cooler experienced a vaporization explosion due to poor control of the outlet valves – the valve openings were too small, which led to the pipes bursting and even the walls being damaged
For oil coolers, using a cooling water inlet valve brings more disadvantages than advantages. Controlling the inlet can save cold water, but limiting the water flow at the inlet can cause a short circuit in the water flow inside the cooler or a reduction in flow velocity, resulting in hot water on top and cold water at the bottom. The use of export controls can ensure flow rate and heat exchange efficiency. Entry control is generally not advisable.
With inlet control, the heat exchanger cannot be filled to capacity, which creates gas blockage and affects heat transfer. As for the concern that export controls will overload the equipment, it’s because your operating pressure exceeds the equipment’s capacity.
If the cooling water flows through the shell side, what’s the difference?
The circulating water is quite dirty, and it’s difficult to clean when it flows through the shell side. There is not much difference in heat exchange efficiency.