Is it better to have a larger fin to fin ratio for finned tube radiators

Is it better to have a larger fin to fin ratio for finned tube radiators

Finned tube radiators are the main equipment in many heat exchange devices. The working principle of finned tube radiators is to use refrigerant to cool air, or heat medium to heat air. A finned tube radiator can enhance heat transfer by adding fins to a regular base tube, in order to have a heating effect. When heating is needed, it can use high-temperature water, steam, or high-temperature thermal oil to heat the air.

For example, a 1 meter long cable φ The finned tube with 25 * 2 seamless tubes and aluminum sheets, with a sheet height of 10mm, a sheet spacing of 2.5mm, and a sheet thickness of 0.3mm, has a heat dissipation area of 0.0785m2 without fins. After adding fins, the total heat dissipation area is 1.24m2. The ratio of the total heat dissipation area after adding fins to the heat dissipation area of the light tube is the finning ratio, with 1.24/0.0785=15.8. Is it better to have a larger fin to fin ratio for finned tube radiators? The answer is negative, for the following reasons:

1. When the heat transfer area of a finned tube radiator doubles, its heat transfer coefficient cannot double, but needs to be discounted, generally ranging from 0.9 to 0.7. Moreover, the higher the fins, the greater the discount value, and even drops below 0.5. This indicates that the higher the fins, the lower the fin efficiency, and increasing the fins results in a decrease in economic efficiency.

2. If the fins are too high or too dense, it is easy to cause dust accumulation and difficult to clean.

3. Fins that are too high or too dense will increase the difficulty of the process and increase processing costs.

One of the characteristics of detachable plate heat exchangers is that they are easy to maintain and clean. Some customers often dismantle and install the heat exchanger due to process requirements, but sometimes due to urgent needs, the plates and gaskets are not cleaned thoroughly before installation, resulting in plate slippage and displacement, leading to installation failure.

Clean the plates and gaskets (especially oil) thoroughly, air dry them before installing the machine. This work should not be done carelessly, because when there is water or oil on the plates and gaskets, it is easy for them to slip and shift between the plates and gaskets during clamping equipment. If forcibly clamped, it will also damage the plate positioning parts, and ultimately require rework. If not done quickly, it will not be achieved.

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