A radiator is a device used to dissipate heat. Some equipment generates a large amount of heat when working, and this excess heat cannot be dissipated quickly and accumulates to generate high temperatures, which may destroy the working equipment. At this point a radiator is needed. The radiator is a layer of good heat-conducting medium attached to the heating device, playing the role of a middleman. Sometimes fans and other things are added to the heat-conducting medium to speed up the heat dissipation effect. But sometimes the radiator also plays the role of a robber. For example, the radiator of a refrigerator forcibly removes heat to reach a temperature lower than room temperature.
The working principle of the radiator is that heat is transferred from the heating device to the radiator and then to air and other substances, where the heat is transferred through heat transfer in thermodynamics. The main modes of heat transfer include thermal conduction, thermal convection and thermal radiation. For example, when a substance contacts a substance, as long as there is a temperature difference, heat transfer will occur until the temperature is the same everywhere. The radiator takes advantage of this, such as using good thermal conductive materials, and the thin and large fin-like structure increases the contact area and heat conduction speed between the heating device and the radiator to air and other substances.
The central processing unit, graphics card, etc. in the computer will emit waste heat when running. The radiator can help dissipate the waste heat that the computer continues to emit, so as to prevent the computer from overheating and damaging the electronic parts inside. Radiators used for computer cooling usually use fans or water cooling. [1] In addition, some overclocking enthusiasts use liquid nitrogen to help computers dissipate a large amount of waste heat, allowing the processor to operate at a higher frequency.
Automobile radiators are constructed of a pair of metal or plastic header tanks, linked by a core with many narrow passageways, giving a high surface area relative to volume. This core is usually made of stacked layers of metal sheet, pressed to form channels and soldered or brazed together. For many years radiators were made from brass or copper cores soldered to brass headers. Modern radiators have aluminum cores, and often save money and weight by using plastic headers with gaskets. This construction is more prone to failure and less easily repaired than traditional materials.
The basic function of the refrigerator is to cool down to preserve food, so it must drain away the room temperature inside the box and maintain an appropriate low temperature. The refrigeration system generally consists of four basic components: compressor, condenser, capillary tube or thermal expansion valve, and evaporator. Refrigerant is a liquid that can boil at low temperature under low pressure. It absorbs heat when boiling. The refrigerant circulates continuously in the refrigeration system. The compressor increases the gas pressure of the refrigerant, causing liquefaction conditions. When it passes through the condenser, it condenses and liquefies and releases heat. , and then reduce the pressure and temperature when passing through the capillary tube, and then boil and vaporize to absorb heat when passing through the evaporator. In addition, refrigeration diodes are now being used, without complicated mechanical devices, but with poor performance, and are used in small refrigerators.
Air cooling, heat dissipation is the most common, and it is very simple, it is to use a fan to take away the heat absorbed by the radiator. The price is relatively low and the installation is simple, but it is highly dependent on the environment. For example, the heat dissipation performance will be greatly affected when the temperature rises.
A heat pipe is a heat transfer element with extremely high thermal conductivity. It transfers heat through the evaporation and condensation of liquid in a fully enclosed vacuum tube. It uses fluid principles such as capillary suction to achieve a cooling effect similar to that of a refrigerator compressor. . It has a series of advantages such as high thermal conductivity, excellent isothermal properties, heat flow density variability, reversibility of heat flow direction, long-distance heat transfer, constant temperature characteristics (controllable heat pipe), thermal diode and thermal switch performance, and is composed of The heat exchanger composed of heat pipes has the advantages of high heat transfer efficiency, compact structure, and low fluid resistance loss. Due to its special heat transfer characteristics, the tube wall temperature can be controlled to avoid dew point corrosion. But the price is relatively high.
Liquid cooling uses liquid to be forced to circulate under the driving of a pump to take away the heat from the radiator. Compared with air cooling, it has the advantages of being quiet, stable cooling, and less dependent on the environment. However, the price of liquid cooling is relatively high, and installation is relatively troublesome.
Semiconductor refrigeration uses a piece of N-type semiconductor material and a piece of P-type semiconductor material to form a galvanic pair. When a DC current is connected in this circuit, energy transfer can occur. The current flows from the N-type element to the joint of the P-type element and is absorbed. The heat becomes the cold end and flows from the P-type component to the joint of the N-type component. The heat is released and becomes the hot end, thereby producing thermal conductivity. [2]
Compressor refrigeration sucks in low-temperature and low-pressure refrigerant gas from the suction pipe, compresses it through the compressor, and discharges high-temperature and high-pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle, thus achieving compression → condensation → expansion → Evaporation (heat absorption) refrigeration cycle. Such as air conditioners and refrigerators.
Radiators are very important! As an important aspect of circuit design, heat sinks provide an efficient way to transfer heat away from electronic devices (such as BJTs, MOSFETs, and linear regulators) and dissipate it into the surrounding air.
The function of a heat sink is to create a larger surface area on the heat-generating device, thereby more efficiently transferring heat out and dissipating it into the surrounding environment. Device heat dissipation paths have been improved to reduce any temperature rise at component junctions.
For home heating terminal equipment, the heat sources are generally urban central heating, community self-built boiler rooms, household wall-mounted boilers, etc., which dissipate heat through heat conduction, radiation, and convection to increase the temperature of the room. Steel radiator, aluminum radiator, copper radiator, stainless steel radiator, copper-aluminum composite radiator, steel-aluminum composite radiator, etc., as well as the original cast iron radiator.
With the changes in modern home lifestyles, radiator heating has been recognized by most home heating. Radiator heating is not only efficient and comfortable, but also very consistent with modern people's living and working habits, so more and more people are choosing radiator heating. In order to achieve a better heating effect, some factors should be considered when selecting a radiator, and the quality of the radiator should be comprehensively considered from multiple aspects.
Choose a trustworthy heating company: Choose a home furnishing platform with consumer satisfaction or trustworthy after-sales service. The company will make radiator prices transparent through a one-stop marketing model and transfer the purchasing model to the customer experience, making it more real, worry-free and more rest assured. The safety performance of the radiator is the most important: there are many factors involved in the safety performance, among which the working pressure of the radiator is a very important one. Many radiators at home and abroad use bar as the unit, and most working pressures are above 10bar. 1bar can withstand a pressure equivalent to 10m of water column, and 10bar is the pressure of 100m of water column. For the majority of users, radiators of 10bar or above should be a reasonable choice. Shop around: You need to shop around. For products of the same style and brand, you must comprehensively consider quality, price, service, etc. Selection: When selecting a model, you should know the inlet and outlet water temperature, required room temperature, room heat load, Factors such as the height and width of the window sill, whether the heating system used in the home is an octopus system or a double-pipe system. This means that the heat dissipation of the radiator must be equivalent to the heat load of the room in order to meet our own heating requirements. Therefore, based on the obtained heat load value The corresponding model of the radiator can be found in the selection table of the corresponding merchant. Style selection: whether to choose plate or column radiator. For small spaces, such as bathrooms, you can choose column-type radiators because they are wall-mounted, which can save indoor space; towels or small items of clothing can also be hung on the horizontal columns; for larger rooms, it is recommended Purchase a taller column radiator. Look at the manufacturer: Does the manufacturer have many years of experience in producing heating equipment, and does the product meet various national standards? Look at the after-sales service: whether it can provide good after-sales service and whether it has a professional plumbing measurement and installation team. The concept must be correct: there is no actual relationship between the heat dissipation and the size of the inlet and outlet water pipes. It mainly depends on the flow rate of water in the heater. As long as the water flow rate can meet the standard, the heat dissipation will also be guaranteed. It is wrong to think that the larger the inlet and outlet size of the heating water pipe, the better the heat dissipation performance will be. The contract is clear: The name, specifications, material, quantity, price, amount and acceptance criteria of the radiator must be stated on the contract. In addition, you also need to know the name, address, contact person, and phone number of the heating company so that you can contact and resolve quality problems in a timely manner. If you do the above nine things, choosing a radiator will no longer be difficult. The choice of radiator is only a part of the radiator heating system. In fact, there are many things to pay attention to when installing and using radiators. This requires us to find a heating company with strong strength, excellent technology and perfect after-sales service. Radiators should also be regularly maintained and cleaned during heating. Only in this way can the radiators be kept running efficiently and extend their service life.
