Is it better to have a built in coil or an external coil!!! Rush 10

There is no absolute sense of good or bad for the external coil and internal coil of the air energy water heater tank, each has its own advantages and disadvantages

Built-in coil. Advantages: high efficiency, fast heating, large energy efficiency ratio, low maintenance cost;

Disadvantages: For long-term use, the coil is easy to form scale in contact with water, which affects the thermal efficiency and is easy to corrode due to different water quality.

However, now the water tank with built-in coil of air energy water heater, like Chigo Air Energy's series of water heaters, has a built-in magnesium rod design, which can effectively prevent the scaling and corrosion of the water tank, so as to eliminate the shortcomings of the built-in coil and maximize the advantages of the inner coil.

PS: Magnesium anode rod (magnesium rod) Magnesium is the metal with the lowest potential in the electrochemical sequence and is physiologically non-toxic. Magnesium alloy is used as the anode of the metal component that needs to be protected, and it is easy to lose electrons by using its characteristics of easy electron loss, so that it can lose electrons and protect the metal components from losing electrons and being oxidized, so as to protect the components.

Its function is mainly anti-corrosion, that is, to protect the inner tank and prolong the life of the inner tank.

Working principle: When the weld of the inner tank leaks iron, it will be corroded quickly. Because magnesium is more active than iron, magnesium is corroded first to protect iron.

Therefore, the anode magnesium rod is not used to remove scale, and its protection principle shows that it mainly generates magnesium oxide, and of course it will also neutralize with other free negative ions, such as magnesium carbonate. None of these things are harmful to the human body. There is no need to worry too much.

External coils. Advantages: The coil is not in direct contact with water, and is not easy to be affected by water quality, scaling and corrosion;

Disadvantages: Compared with the inner coil, the thermal efficiency is low, the heating is slow, and the coil can only be replaced if it is damaged. The inner wall of the water tank will also produce scale during use, because of the repeated influence of thermal expansion and cold contraction, the coil wall is easy to separate, and the inner tank is easy to burst.

Therefore, the inner coil and outer coil of the air energy water heater tank have their own advantages and weaknesses. The choice is yours. However, as a consumer – I use Chigo Air Energy Evian.

A colorful product, the inner coil water tank is still good, I have used it for so many years without any problems, so I highly recommend you to use!

The external coil is good.

Depending on the design, statically heated air energy water heaters can be divided into a built-in coil type in which the heat exchange coil is placed in the water in the barrel and an external coil type in which the heat exchange coil is coiled outside the barrel wall.

The advantage of the built-in coil type is that the heat exchange efficiency is high, and the disadvantage is that the coil is immersed in water, which is easy to rust and crack, causing the refrigerant to flow into the water and pollute the bath water.

The external coil does not have such health hazard concerns, although the heat exchange efficiency is not a direct contact heat conduction, but the safety is guaranteed, so the heating method of the outer coil method is better.

The inner coil heats up relatively quickly, but with the extension of the use time, the scale on the surface of the heat exchange tube will continue to thicken, and the energy efficiency will be greatly reduced. Now Finney's air energy uses an outer coil, and if you are interested, you can go to Finney** to have a look.

In terms of current technology, in the long run, it is better to use an outer coil, which will always scale and consume energy when put into water, and may perforate, and shorten the service life a lot. Although some merchants now say that magnesium rods are added, magnesium rods are a consumable after all, and they will be useless in one or two years, and the cost of replacing them is too high. The outer coil does not consume much electricity than the inner coil, and the inner tank is thicker!

Good question, there are different opinions on the question of coiling. I don't know what kind of pump water circulation is being used in the house. Let's talk about the outer coil first, the outer coil is a copper pipe sandwiched between the polyurethane insulation layer and the inner tank of the water tank.

In this way, their inner tank will be thinner, and if it is too thick, the heating efficiency will be slower, and there will be a large heat loss. Moreover, when heating, the high-temperature copper pipe will burn the polyurethane layer of insulation material thinner and thinner. The insulation effect is also getting worse and worse.

Sometimes the appearance of the tank will feel hot when you touch it. This is heat loss. Further reduced his heating effect.

In the early stage, many air energy producers used inner coils. Later, because the quality of copper materials is not up to standard, it causes scaling and copper pipe corrosion.

Really good inner coil, because the copper tube is in the inner tank, directly heated, the heating efficiency is undoubtedly the highest. And it doesn't burn out the insulation. (Don't put a pump in the tank, it's difficult to use a pump in the tank for ten years without problems.)

If there is a real problem, that is, the manufacturer has a warranty, and it must be sent to the manufacturer to be cut layer by layer, and it will be repaired at the cost of destroying the insulation layer and reducing the insulation effect). If you want to make a built-in coil, the technology is there, and the selected material must be good, but the material is not good, no matter how good the technology is, there may be scaling and copper corrosion. Then add magnesium rod as an anodic protection copper tube.

If you can do this, with the support of technology, there is no problem in making a built-in coil. I don't know much about the so-called space energy combined with solar energy, and if there is a copper pipe, there is no need to add a pump in the tank, and the water circulation is without a coil. The cost of water recycling is lower than that of copper pipes.

The oxygen-free process we use copper, the cost of copper materials used in a water tank is thousands of yuan.

Please see**, water recycling type.

Coilless air energy means that there is no copper pipe in the tank, and its copper pipe is on the main engine side, which is now called the water circulation. It uses a casing heat exchanger, and the water flows in the S-shaped copper tube, and the casing on the outside of the copper tube flows in the refrigerant. In fact, its copper pipe is also in contact with water, and scaling and corrosion are inevitable, so the key is to look at the copper tube material, whether it is ordinary brass, commonly used alloy copper, or high-purity copper, the thermal conductivity and corrosion resistance of copper are significantly better than the first two.

Generally speaking, the internal components of water circulating air energy are strict, and more are used in engineering machines, and due to the problem of cost and cost of household machines, the general selection is smaller, and the highest is higher, which affects its cost performance.

At present, the household machine is still based on the built-in coil, with the copper pipe as the high quality, and the solar energy is used together, only need to use the hot water pipe to connect from the solar water tank, and then connect to the air energy tank cold water pipe inlet, so that when the solar water temperature is not enough, the air can start heating.