What are the factors that affect the heat transfer area of the heat exchanger?

What are the factors that affect the heat transfer area of the heat exchanger?

Intrinsic factors affecting the effect of heat exchange area of heat exchanger

The air in the heat exchanger is not exhausted: the heat exchanger body is not designed with high-point air release valves on the tube side and shell side, which will affect the heat exchange effect to a certain extent. In order to reduce the impact, we have installed an air release valve at the highest point of the water supply and return pipes of the entire heating system. When the system is filled with water at the initial stage of operation and during operation, the air must be released from time to time to minimize the impact of air in the system. Heat exchange effect.

Scaling phenomenon in the heat exchanger: scaling of the heat exchanger will have a great impact on the heat exchange effect of the heat exchanger, resulting in a decrease in the heat transfer coefficient, a greatly reduced heat transfer efficiency, and a low outlet water temperature. In order to avoid fouling of the heat exchanger, when selecting the heat exchanger, we specially selected the double-strand tube heat exchanger. The special structure of the heat exchange tube of the heat exchanger makes the water flow in the tube in a turbulent state, and the flow rate is relatively fast. High, not easy to scale.

External factors affecting the effect of heat exchange area of heat exchanger

Blockage of the waterway: The blockage of the waterway of the heat exchanger will reduce the amount of circulating water flowing through the heat exchanger, resulting in a large temperature difference between the outlet water and the inlet water of the heat exchanger, a large pressure difference, and a high drain temperature.

Unsmooth drainage: The system has poor drainage of condensed water during operation, and the water level in the heat exchanger often reaches the upper limit. It is necessary to open a bypass to drain water, otherwise the water level in the heat exchanger will rise and the steam pressure on the steam side will rise. High, causing the safety valve on the steam side of the heater to jump. The existence of this situation makes the operator only reduce the amount of steam intake and open the bypass operation for a long time, which greatly reduces the heat exchange efficiency of the heat exchanger.