The basic principle and function of PTC heater PTC type ceramic heater is made of PTC porcelain hot parts and wavy aluminum plate through high temperature viscose. This type of ptc electric heater has the advantages of small heat transfer coefficient and high heat exchange efficiency. It is a fully automatic temperature control and power saving electric heating device. One of its prominent characteristics depends on the safety factor. Under all operating conditions, it is not easy to cause the surface "redness" of the heating tube electric heater, which will cause burns, fire accidents and other full risks. The obvious characteristics are: PTC type ceramic heater saves costs and has a long life. The professional temperature controller and thermal resistance thermal resistance and other temperature sensors can carry out the hot operation of the electric heater through the temperature feedback. The service life of the water heater. PTC type ceramic heater is safe, low-carbon and environmentally friendly. The design scheme of the electric heater itself has a heating temperature of multiple levels below 200 degrees Celsius. Under all conditions, it is not reddened and has a maintenance protection layer. All applications do not require asbestos and other heat insulation materials to cool down, and can be used with confidence There is no problem of scalding the human body and causing fire. The PTC ceramic heater saves electric energy.
Briefly describe the energy saving of thermistor
According to the different temperature coefficients of resistance, PTC thermistors can be divided into three categories:
1. Positive resistance temperature coefficient thermistor;
2. Critical resistance temperature coefficient thermistor;
3. Ordinary negative resistance temperature coefficient thermistor.
The temperature range of the first two types of sudden changes in resistance is narrow, so it is suitable to be used as a control and alarm sensor in a specific temperature range. The third category is widely used in the field of temperature measurement. As a temperature sensor, the thermistor has the advantages of saving materials, low cost, small size, simple structure, and large absolute value of the resistance temperature coefficient. It can easily and sensitively measure small temperature changes. Relevant scientific research institutions in China have also developed a series of different types of thermistor sensors that can measure low temperatures from -260°C to 900°C. They are widely used in many fields such as artificial earth satellites and other related aerospace technologies, deep-sea exploration, and scientific research. application.
I believe that everyone is familiar with foot baths. It has health benefits. Regardless of the small foot baths, there are many types, such as wooden barrels and quartz stones. The more common ones are using PTC thermistors to heat up. Let us Look at its heating principle.
The PTC material is used to completely separate the water from the heating element. The specific method is: the outer layer of the PTC material is an insulating quartz layer, which has high sealing performance and thermal conductivity. The PTC material is in close contact with the outer wall of the water pipe, and heat is transferred to the inner water flow through the outer wall of the water pipe. . In this way, the two ends of the glass tube will not easily leak and explode after long-term use. Moreover, even if water is splashed on it, the water flow will not be charged due to the solid sealing of the PTC. Furthermore, even if a piece of PTC material is destroyed and charged, its voltage is only a dozen volts, and there is no danger.
Secondly, the PTC material has a long service life. Generally, the stainless steel heating tube will be damaged after one year of use, and the glass tube will be damaged due to water leakage due to the aging of the plastic material at both ends after two years. However, the PTC material can be used for 8-10 years without damage, and the power attenuation will not More than 5%. Therefore, it is widely used in the aerospace industry and automobile industry.
The footbath PTC element greatly reduces the probability of scaling. The stainless steel heating tube has an interface temperature of up to 800 degrees Celsius in contact with water, which is very easy to form scale, and it is the accumulation of scale that shortens the life of the heating tube. The water interface temperature of the quartz glass tube is also as high as several hundred degrees, but because the surface finish of the glass tube is higher than that of the stainless steel heating tube, the probability of scaling is reduced. However, due to the high interface temperature, in areas with higher water hardness, scaling will occur. serious.
The temperature of the contact surface between the PTC heater and the water is only about 200 degrees, and it depends on its special structure to increase the contact area with the water to achieve the same heating rate. At 200 degrees Celsius dynamic water flow contact surface, scale is difficult to form. With less scale, the thermal efficiency of the heating system remains stable for a long time, and at the same time, the cleaning and maintenance costs in the later period are reduced.
From the perspective of preventing heat loss, the thermal efficiency of PTC heating technology is higher than that of glass tube heating systems. The high-temperature surface of the glass tube is completely exposed, and the heat is lost severely during use. The heating material of the PTC heating system is wrapped in the middle of the water pipe, and the heat is almost completely absorbed by the water, which is extremely efficient.