The heaters are a combination of a ventilator, motor and air heater.Suitable for various types of workshops, when the air does not contain dust and flammable or explosive gas, it can be used as a circular air heating.The heater can be used independently for heating. It is generally used to supplement the insufficient part of the radiator or uses the radiator as a duty heating. The remaining thermal loads are borne by the heater.
What are the types of heating fan?
As a thermal aircraft of the end installation of the hot water or steam heating system, there are two types of thermal heater and steam heater according to the thermal media.The former uses hot water as a thermal media, and the latter uses steam as the heat media.
There are two types of fans: bearing and centrifugal type.Bearing fans are often used in small units; centrifugal fans are often used in large units.Small heater has NC, NF, S, TS, NA and other models. Large heater has NBL and NLGS models.
The heater is divided into three categories according to the appearance and structure:
(1) Cross -blow heater: The indoor air is inhaled from one side, and after heating the heat exchange, the horizontal direction is delivered.There is a certain range of the shot, which fully mixed the air in the heating range and the temperature is uniform.
(2) Top blowing heater: The axis flow machine is placed below the unit, the air enters from the side of the heater, and the passing air heat exchanger is heated, and it is sent down.In order to make the shot surface sent outwards, the exit of the fan is equipped with the guidance blades for diffusion.
(3) Floor -floor heater: The air volume of such units is large, and the range of hot air is long, which can afford the heating of larger areas.During the run, the noise is high.Suitable for the heating of the factory building.
There are many specifications of horizontal and top -blowing heater, which are distinguished by models.The model represents the example as follows: NF5ZSH, NF represents the heaters, the number 5 is one thousandth of the air volume, Z represents the axis flow fan, S represents the hot water H represents the horizontal blowing type for the hot water H represents the horizontal blowing type.
Precautions for the selection of warm wind machines
Small heater
(1) In order to make the temperature field of the workshop uniform and maintain a certain section speed, when selecting a heater, the number of air circulation in the workshop should be calculated, generally not less than 1.5/h.
(2) When arranging the heater, it is advisable to connect the shots of the heater to each other, so that the heating space forms a total air circulation.
(3) The heater should not be arranged on the outer wall vertically indoors.
(4) The installation elevation at the bottom of the heater should meet the following requirements:
(5) The range X of the heater can be estimated according to the formula:
The range of the X -thermal fans in the formula, m;
V0 — The exit wind speed of the heater, m/s;
D — The equivalent diameter of the exit of the heater, M.
(6) The temperature of the air supply should not be less than 35 ° C, and should not be higher than 55 ° C.
Large heater
When the large heater heating is selected, because the export speed and air volume are very large, the distance between the air outlet should be arranged along the length of the workshop. The distance of the outlet from the side wall should not be less than 4m.There should be no structure or tall equipment, and the height of the air outlet shall meet the following requirements [1]:
When the string of the factory is ≤8m, it is advisable to take 3.5 ~ 6m;
Large heater should not be arranged near the door of the workshop, and the height of the bottom of the air in the air should not be greater than 1m or less than 0.3m.

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