The heat exchanger has low efficiency
Thread Content
The heat exchange area of the heat exchanger is sufficient, and there is no fouling in the tube-shell section; therefore, no matter by how many degrees the inlet temperature of the circulating water is reduced, the temperature difference of the circulating cooling water remains stable, as does the temperature of the exhaust gas. Yet the heat exchange efficiency seems poor. What could be the reasons for this?
Another factor affecting heat exchange efficiency is the elimination of gas accumulation. Do you mean that the exhaust temperature remains constant when the temperatures on the inlet and outlet sides of the cooler are the same? Is there no temperature difference? Is it the same on the water side?
If the heat exchange efficiency is poor, how can it be said that the heat exchange area is sufficient? By how many degrees can the circulating water temperature be reduced? How much of an impact can the temperature difference of the exhaust gases have? Since water can carry heat away stably, it indicates that the heat transfer coefficient is relatively stable. It might be that the heat exchange area is insufficient! Or an unreasonable process structure reduces the heat transfer coefficient!
1. Check whether there is a problem with the temperature sensing, such as loosening that prevents the actual temperature from being accurately reflected. 2. Is there any blockage or other issues with the circulating water circuit (pump)? 3. Could there be some air or other substances trapped in the heat exchanger, resulting in a decrease in its heat exchange efficiency? The above opinions are for reference only
The heat exchange area is sufficient because a larger heat exchanger than the one specified in the design was used; no fouling was detected during on-site inspections. The temperature difference is 6°C. Even after reducing the inlet water temperature by 3°C, the temperature difference remains at 6°C – it seems that the heat cannot be transferred out
Is it possible that there is a leak in the recirculating water baffle, causing the water to exit before reaching the end of its path?
If the inlet water temperature drops by 3°C while the temperature difference remains unchanged, does that mean the outlet water temperature also drops by 3°C?
Even if there’s a leak, it can’t be completely straight-through, right? I don’t know whether your heat exchanger is at a low position or a high position, and whether the system has an exhaust valve Sometimes, there are too many bends in the system, which causes the returning water to disturb the liquid level in the tank significantly; as a result, bubbles accumulate in the pipes, leading to a decrease in heat exchange efficiency
1. What is the type of heat exchanger? 2. To cool gas with water… direct spraying is generally used for cooling; if a heat exchanger is employed for cooling, won’t it be difficult to achieve sufficient cooling? The heat transfer coefficients of the two methods differ greatly, as do the flow rates… 3. Is the equipment filled with water (please check by releasing air)? 4. Was the manufacturer consulted for evaluation and recommendations when making the choice?
It’s better to describe such issues as clearly as possible; otherwise, everyone can only guess :)