The basic methods to enhance heat transfer are as follows

According to the basic heat transfer formula: q = k * f * t, it can be seen that the increase of heat production Q can be realized by increasing the heat transfer coefficient K, expanding the heat transfer area F and increasing the heat transfer temperature difference t.

1) Extended heat transfer area f

In order to increase heat transfer, it should not be understood as increasing heat transfer area by simply expanding the area of equipment or increasing the number of equipment, but should reasonably increase the heat transfer area per unit volume of equipment, such as using finned tube, corrugated pipe, plate fin heat transfer surface, etc., that is to say, from the research on how to improve the structure and layout of heat transfer surface, increase the heat transfer area, In order to achieve the purpose of high efficiency and compact heat exchange equipment.

2) Increase heat transfer temperature difference t

The temperature difference of heat transfer can be changed by changing the temperature of hot or cold fluid. For example, increasing the pressure of steam in the radiant heating plate tube; increasing the hot water temperature of hot water heating; replacing tap water with low temperature deep well water for condenser cooling water; and

Reducing the temperature of cooling water can directly increase the temperature difference of heat transfer. On the other hand, the flow pattern between the heat exchange fluids is changed,

Such as forward flow, counter current or cross flow, their heat transfer temperature difference is also different.

The increase of heat transfer temperature difference should consider whether the actual process or equipment conditions allow. For example, increasing the steam temperature of radiant heating panel can not exceed the radiation intensity allowed by radiation heating, and it will also be limited by boiler conditions. It should be realized that the increase of heat transfer temperature difference will increase the irreversibility of the whole thermodynamic system and reduce the available energy of the thermal system. Therefore, we should not blindly pursue the increase of heat transfer temperature difference, but consider the reasonable application of energy in the whole thermal system.

3) Increase heat transfer coefficient K

The positive measure to enhance heat transfer is to improve the heat transfer coefficient. Because the total thermal resistance of heat transfer process is the superposition of various partial thermal resistances, it is necessary to analyze each thermal resistance of heat transfer process to change the heat transfer coefficient. In the heat exchange equipment, it is generally thin-walled metal, and the thermal resistance of the wall is very small, which can be omitted. For the convenience of analysis, the fouling resistance is not considered.

The immersion heat exchanger is used in the heating system of immersed tube water tank designed and developed by Shanghai aidija Thermal Energy Technology Co., Ltd. this heating method adopts straight pipe or serpentine tube to form heat transfer surface, and the pipe is immersed in the liquid container or pool, as shown in the figure. This kind of heat exchanger can be used as the preheater and evaporator of liquid, as well as the cooler or condenser of gas and liquid. This heater is usually used for surface treatment of industrial products (metal parts, iron bars, iron wires, etc.)

1. Various pretreatment processes

Soaking pool

Spray system

Hot water supply system

Latex glove industry

2. Cleaning (industrial cleaning machinery)

Container cleaning

Component cleaning

Bottle cleaning

3. Food and beverage processing

Hot water tank

Wort processing container

Cleaning box

Depilation of livestock and poultry

bleach

4. Textile printing and dyeing industry

Dyeing cell

Cleaning tank

The immersed heat exchanger has the advantages of high heat efficiency, simple structure, convenient manufacture and repair, and easy cleaning. It is also suitable for corrosive fluids due to the convenience of changing pipes.