The radiator is hot water (orsteam）The important and basic components of the heating system.The hot water cools down in the radiator (or the steam condenses in the radiator) to supply heat to the room, so as to achieve the purpose of heating.The metal consumption and cost of radiators account for a large proportion in the heating system. Therefore, the correct selection of radiators involves the economic indicators and operating effects of the system.[1]
The higher the heat transfer coefficient of radiators made of the same material, the better their thermal performance.It can be used to increase the heat dissipation area of the outer wall (add wings (ribs)), increase the flow speed of the air around the radiator (such as the cover of the steel tandem radiator), strengthen the radiation intensity of the radiator's outer surface (such as the coating with high radiation coefficient on the outer surface), and reduce the number of radiator parts (such as the steel pipes and tandem fins of the steel tandem radiator)The thermal performance of the radiator can be improved by taking measures such as contact thermal resistance.[1]
Economic indicators
The lower the unit heat dissipation cost (yuan/W) of the radiator, the lower the installation cost, the longer the service life, and the better the economy.The higher the metal heat intensity of radiators of the same material (metal per unit mass, heat dissipation per 1 ℃ heat transfer temperature difference (W/(kg · ℃)), the better its economy.[1]
Requirements for installation, use and process
The radiator shall have a certain mechanical strength and pressure bearing capacity, and shall be easy to install and assemble into the required heat dissipation area;The size should be smaller, and the room area and space should be less occupied;It is not easy to be damaged during installation and use;The manufacturing process is simple and suitable for batch production.[1]
Hygienic and aesthetic requirements
The radiator surface shall be smooth and easy to remove dust;The appearance should be beautiful and coordinated with the room decoration.[1]
Product category
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Radiators are divided into radiant radiators andConvective radiator。Convective radiatorThe convective heat dissipation capacity of is almost 100%, sometimes called "convector";Compared with convection radiator, other radiators dissipate heat by convection and radiation at the same time, sometimes called "radiators".[1]
Radiators are divided into cast iron radiatorssteel radiator And other materials.Other radiators include radiators made of aluminum, copper, steel aluminum composite, copper aluminum composite, stainless steel aluminum composite, enamel and other materials.[1]
Shopping Guide
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The radiator selection shall meet the following requirements:
(1) Good thermal performance
(2) Pressure bearing capacity meets the requirements
(3) The appearance should be coordinated with the interior decoration, and its size should adapt to the building size and requirements
(4) It is easy to remove dust.[1]
Installation Guide
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Figure 1 shows the layout scheme of the radiator.Radiators can be surface or concealed.It is easy to remove dust during surface installation, simple in layout and conducive to heat dissipation.For civil and public buildings with high requirements for room decoration, or places where burns or bumps are to be prevented, decorative covers can be added for concealed installation.In most cases, the heat dissipation of the radiator is reduced after the cover is added.The radiator of staircase shall be arranged at the bottom and lower floors as far as possible.But it cannot be placed between two external doors.Radiators arranged at the ground floor of the staircase and other places with freezing danger shall be far away from the external door.[1]
Figure 1 Layout plan of radiator indoors
Figure 2 Schematic diagram of indoor air circulation under different radiator layout schemes
Related formula
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When the heat transfer coefficient k is known or found, the calculated area of the radiator can be obtained by the following formula:[1]
Where, A - calculated area of radiator, mtwo；
Q - heating design heat load, W;
tm- Average temperature of heat medium of radiator, ℃;
- Indoor air temperature, ℃;
- Correction coefficient of the number of radiators;
- Correction coefficient of radiator connection mode;
- Correction coefficient of radiator installation form.
When the service conditions are different from the test conditions, the heat transfer performance of the radiator changes, and different coefficients should be used
