How does a heat pipe work? How does an electric heating pipe work

Heat pipe technology is a kind of heat transfer element called "heat pipe" invented by the Losalamos National Laboratory in the United States in 1963, which makes full use of the principle of heat conduction and the rapid heat transfer properties of the refrigerating medium, and quickly transfers the heat of the heating object to the heat source through the heat pipe, and its thermal conductivity exceeds the thermal conductivity of any known metal.

From a thermodynamic point of view, why do heat pipes have such good thermal conductivity? The heat absorption and exothermia of an object are relative, and whenever there is a temperature difference, there will inevitably be a phenomenon of heat transfer from high temperature to low temperature. There are three ways to transfer heat from it:

radiation, convection, conduction, of which heat conduction is the fastest. Heat pipes use evaporative refrigeration, so that the temperature difference between the two ends of the heat pipe is very large, so that the heat is quickly conducted. Generally, heat pipes are composed of a tube shell, a wick and an end cap.

The inside of the heat pipe is pumped into a negative pressure state and filled with an appropriate liquid, which has a low boiling point and is easy to volatile. The tube wall has a wick of liquid absorption, which is made of a capillary porous material. When the heat pipe is heated, the liquid in the capillary evaporates rapidly, and the vapor flows to the other end under a small pressure difference, and the heat is released, and it is re-condensed into a liquid, and the liquid flows back to the evaporation section along the porous material by the action of capillary force, so that the cycle continues, and the heat is transferred from one end of the heat pipe to the other end.

This cycle is fast, and the heat can be continuously conducted.

Like the heat pipe in the notebook, it is not really a heat pipe, but just a pure copper thermal conductive element.

The basic composition of a heat pipe consists of three parts: the shell, the capillary structure, and the action fluid.

Its working principle: 1) heat is transferred from the heat source through the heat pipe wall and the wick filled with the working liquid to the (liquid) interface; (2) the liquid evaporates at the (liquid-vapor) sub-interface in the evaporation section; (3) The steam in the steam chamber flows from the evaporation section to the condensing section; (4) The steam condenses on the vapor-liquid interface in the condensation section: (5) The heat is transmitted to the cold source from the (vapor-liquid) interface through the suction core, liquid and pipe wall

6) In the wick, the condensed working liquid is refluxed to the evaporation section due to capillary action.

Electric heating pipe principle: The resistance wire inside the electric heating pipe is used to heat.

An electric heating pipe is a kind of energy that consumes electricity and converts it into heat energy to heat the material to be heated. In the work, the low-temperature fluid medium enters its input port under pressure through the pipeline, and along the specific heat exchange flow channel inside the electric heating vessel, the path designed by the principle of fluid thermodynamics is used to take away the high-temperature attitude and open heat energy generated in the work of the electric heating element, so that the temperature of the heated medium rises, and the high-temperature medium required by the process is obtained at the outlet of the electric heating pipe.

The principle of copper tube heat dissipation is to use the excellent thermal conductivity of copper metal and the condensation conversion of liquid in the copper tube to export the heat in the motherboard.

When the motherboard is above the critical temperature, the water vapor in the heat dissipation copper tube will carry the heat away from the motherboard along the capillary structure. When the water vapor cools down and liquefies, it will start to circulate back.

A heat pipe heat sink consists of a sealed tube, a wick, and a vapor channel. The wick wraps around the wall of the sealed tube and is immersed in a volatile saturated liquid. This liquid can be distilled water, ammonia, methanol or acetone, etc.

Heat pipe radiators filled with liquids such as ammonia, methanol, and acetone still have good heat dissipation capacity at low temperatures.

The principle is that in the evaporation section of the heating heat pipe, the working liquid in the core is heated and evaporated, and the heat is taken away, the heat is the latent heat of evaporation of the working liquid, the steam flows from the central channel to the condensation section of the heat pipe, condenses into a liquid, and at the same time releases latent heat, and under the action of capillary force, the liquid flows back to the evaporation section. In this way, a closed cycle is completed, which transfers a large amount of heat from the heating section to the heat dissipation section.

When the heating section is at the bottom, the cooling section is at the top, and the heat pipe is placed vertically, the reflux of the working liquid can be satisfied by gravity, and there is no need for a capillary core, and the heat pipe without a porous core is called a thermosiphon. The thermosiphon has a simple structure and is widely used in engineering.

The heat from the external heat source rises through the tube wall of the evaporation section and the temperature of the immersion working fluid. The temperature of the liquid rises, the liquid level evaporates, until the saturated vapor pressure is reached, at which point the heat is transferred to the vapor in the form of latent heat. The saturated vapor pressure in the vapor segment increases as the temperature of the liquid increases.

Under the action of pressure difference, the vapor flows through the vapor channel to the condensing section with low pressure and low temperature, and condenses at the gas-liquid interface of the condensation section, releasing latent heat.

Phase change heat transfer. Boiling at one end, condensation at the other.

The working principle of an electric heating pipe is actually quite simple.

The alloy heating wire inside heats up the water by filling the tube and compressing the very compact magnesium oxide to the body of the heating pipe. It has nothing to do with what ions are in the water you are talking about. Water is just plain water, and there are no special requirements.

Hope it helps.

In fact, it is generated by the heat generated by the resistor. w=i2*r*t, that's the formula.

It is heated by using a resistance wire inside the electric heating pipe.

The instructions say that it conducts electricity by ions in water, so won't it leakage? Is it safe? Does it mean that it conducts heat by ions in water?

The best way to turn "slow heating" into "fast heating" is to increase the electrical power of the electric heating pipes, which is commonly referred to as wattage.

The outside is a metal tube, the inside is a resistance wire for heating, and the amethy stone conducts heat and insulation!

It's not the same, there is an electric heating wire in the electric heating pipe, which dissipates heat by heating the medium at high temperature, magnesium oxide.

The landlord is talking about electromagnetic heating pipes, right? It seems that this heating speed is like this, and the ordinary resistance wire electric heating pipe is easy to say, change to a high-power one.

Inside the electric heating pipe is an electric heating wire.

The heating element is a metal tube with a resistance wire inside, which is the same as the electric furnace wire. The principle of heat generation, the passage of an electric current through a resistor to generate heat. It has excellent performance such as long service life, high electro-heat conversion efficiency, far-infrared radiation, health and environmental protection.

According to the law of electric heating: the amount of heat generated is proportional to the square of the current and the product of the resistance. Principle of Thermal Effect of Electric Current:

The electrons are accelerated in the electric field, gain kinetic energy, have velocity, and then collide with other particles (atoms, molecules, clusters) to cause other particles to gain kinetic energy, resulting in an increase in average kinetic energy and an increase in temperature. Joule-Lenz law: When an electric current passes through a resistor, the resistance heats up and converts electrical energy into heat, a phenomenon called the thermal effect of electric current.

Through a large number of tests, Joules and Lenzes found that the heat generated by the resistance through the current is proportional to the square of the current, the resistance and the energizing time. This is the Joule-Lenz law. This article is from Zhongshan City, Tanzhou Town, Chuangxinxiang Hardware Electric Heating Equipment Manufacturing Factory.

When the cross-linked crystalline polymer material is heated above the crystalline melting point, it no longer flows, but is in a rubber state and becomes an elastomer. In this state, the expansion is cooled below the crystallization temperature under tension or deformation. As a result of crystallization, the frozen cross-linked chain is shaped into the desired expanded shape and becomes a product with a shape memory effect.

When the expanded product with shape memory heat shrinkage is reheated to the crystallization melting point temperature, it is restored to the initial shape of the irradiation cross-linking under the action of the cross-linked chain in the stress state, which is the heat shrinkage or shape memory principle.

The electric heat trace consists of nano conductive carbon particles and two parallel busbars with an insulating layer, thanks to this parallel structure, all self-limiting electric traces** can be cut to any length in the field and connected by two- or three-way junction boxes.

In each wire, the number of circuits between the busbars varies with the influence of temperature, when the temperature around the heat trace cools, the conductive plastic produces the contraction of micromolecules and makes the carbon particles connect to form circuits, and the current passes through these circuits, so that the heat trace heats.

When the temperature rises, the conductive plastic produces the expansion of micromolecules, and the carbon particles gradually separate, causing the circuit to interrupt, the resistance rises, and the heat trace automatically reduces the power output.

When the temperature becomes cold, the plastic returns to the state of micromolecular contraction, and the carbon particles are connected accordingly to form a circuit, and the heating power of the heat trace automatically rises.

Self-limiting heat tracing has the advantage of not being found in other heat tracing equipment, it controls the temperature from being too high or too low because the temperature is automatically regulated.