Industrial heaters
In winter, except for parts of Yunnan and low-latitude areas such as Guangzhou and Hainan, other parts of China are really cold, and sub zero temperatures are common. At such times, we all hope to have a "weapon" that can solve the cold.
The heater will become one of our choices. "However, there is a significant difference in the appearance, size, and market price of electric heaters in shopping malls, and it is often a headache to stroll around.". Under such circumstances, how can a consumer buy a suitable electric heater for themselves? Let's take a look at the common basic working principles and advantages of various electric heating devices, enabling us to quickly select the heater that is suitable for us, allowing the heater to bring us warmth, and making this winter no longer cold.
In order to better understand electric heating devices, the first step is to classify them. This article classifies electric heating devices according to different heating methods.
Three heating methods: thermal radiation, thermal conduction, and thermal convection.
Thermal radiation transmits heat through infrared light. When we bathe in the sun, we feel warm, that is, the sun transmits heat to us through infrared radiation. Heat conduction is the process of transferring heat from high temperature to low temperature. Heating a hand-held hot water bag is a process of heat conduction. Thermal convection is a heat transfer process caused by the mutual diffusion and fusion of hot and cold fluids. When boiling water in a kettle, the high temperature water at the bottom and the low temperature water at the top will form thermal convection and heat transfer. Both heat transfer and thermal convection require media, and the heat transfer speed is relatively slow. Thermal radiation transfers heat through light without the need for a medium and at the speed of light, so the heat transfer speed is very fast.
Common four types of point heaters.
According to different heating methods, ordinary electric heating devices are divided into the following four types.
Radiation electric heating devices.
commonly referred to as the Little Sun, are the most common radiation electric heating devices. The heating body (electric heating element) in the radiation electric heating device emits infrared light after being energized, and is concentrated in a specific direction through a reflector to achieve directional heating, suitable for local heating.
Quartz tubes, halogen tubes, carbon tubes, etc. are common electrical heating elements in radiation heating devices. Quartz tubes and halogen tubes are relatively inexpensive, but a large amount of electrical energy is converted into visible light (the heating effect of visible light is not as good as infrared light), and the efficiency of electrothermal conversion is low. In addition, the brightness is strong and is not suitable for use in the bedroom. The carbon tube emits a large proportion of infrared light, while the proportion of visible light is small. The light is soft, and the electric heat conversion efficiency is high. In addition, carbon tubes have a relatively long working life and are a good electrical heating element with a relatively high market price.
Radiation electric heating devices have the advantages of instant heating, directional heating, and low noise, but also have the disadvantages of strong light sensitivity and small heating range. They are only suitable for local heating, not for the entire room heating.
Forced convection electric heater.
A common heater is a forced convection electric heating device. Its basic working principle is to increase the temperature of the heating element after powering on, heating the air inside the fuselage, accelerating the air to blow out hot air, generating forced convection, and improving the room temperature, such as a large blower. The heating element of an electric heater is usually electric wire or ceramic. There are more electric wires used in the market, which are cheap but not waterproof. Ceramic components have a waterproof function, and waterproof design products can be used in bathrooms, but the market price is high.
Convective electric heating device.
After being powered on, the convective electric heating device heats the surrounding air and transmits heat to the entire room through convection of hot and cold air. Convective electric heating devices can be divided into natural convection and forced convection. Natural convection electric heating devices: Common natural convection electric heating devices include electric oil heaters, fast heating furnaces, and skirting wires. Natural convection electric heating devices use hot air to expand and rise, while cold air sinks, forming air convection to transfer heat, thereby improving room temperature.
Electric heating oil heater, also known as oil filled electric heater, looks like a radiator in the north, but the radiator is filled with water, while the electric heating oil heater is filled with heat transfer oil. After electrification, the heat transfer oil around the electric heating pipe is heated, and the heat is distributed along the heat transfer pipe or radiator. The heated air around rises, forming air convection. After powering on, due to the long time required to preheat the heat transfer oil, the heating is slow when starting up. However, the heated heat transfer oil also cools slowly and can be kept warm for a long time after power failure.
The fast heating furnace.
The fast heating furnace also known as the European fast heating furnace, usually has a thin plate appearance with a large number of pores above and below. After powering on, the temperature of the heating element at the lower part of the fuselage rises, heating the air inside the fuselage, discharging hot air from the upper part, and supplementing cold air from the lower part, allowing the room to be heated and circulated. The heating elements of a fast heating furnace are usually made of alloy material, without heat transfer oil, with high electrical conversion rate, fast preheating, light body, and easy to move. Some fast heating stoves are waterproof and can be used in bathrooms. Skirting wire electric heating devices usually have a long appearance and a large number of pores above and below. Its heat dissipation principle is similar to that of a fast heating furnace. It also uses alloy materials as heating elements, with high electrothermal conversion, large heat dissipation area, short preheating time, and fast heating speed. Due to its relatively long appearance, there are certain requirements for the use site, and it is generally used in corners.
The advantages of the heater are instant heating, large heating range, and no light perception. The disadvantage is that it is noisy and not suitable for long-term blowing, nor is it suitable for use in dusty areas.
SIAL
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