Comparison between high-temperature fans and ordinary fans
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Recently, we have encountered a problem. Our operating conditions are normal pressure and normal temperature, with the air temperature around 40°C. The required air flow rate is 2 W. The fan supplied by the manufacturer also has an air flow rate of 2 W, but its model is Y9-38, which is actually a boiler exhaust fan designed to operate at a temperature of 200°C. The questions are as follows: 1. Can the flow rate of this high-temperature fan reach a certain level when the medium changing to normal-temperature air? ； 2. For fans with the same air volume, are the motor powers of high-temperature fans and ordinary high-pressure fans the same, or is one higher than the other? ； 3. What changes have occurred in the performance and maintenance of high-temperature fans after their operating environment changes?
As the specific gravity of the imported medium increases, it is necessary to prevent insufficient motor power.
According to the thermodynamic formula p=NRT/v, when the pressure remains constant, a decrease in temperature T results in a decrease in flow rate Q! That is, the rated flow rate for transporting gases at room temperature decreases! Just install a flow meter at the outlet: it can be measured
You’re calculating this based on mass flow rate! Is there actually a relationship between the fan’s air intake volume and the density of the medium? Just like a centrifugal pump, its flow rate has little to do with the density of the medium, but rather relates to the viscosity of the medium
You’re calculating this based on mass flow rate! Is there actually a relationship between the fan’s air intake volume and the density of the medium? Just like a centrifugal pump, its flow rate has little to do with the density of the medium, but rather relates to the viscosity of the medium
Air volume has no relation to density; air pressure is proportional to density. Under the design operating conditions of high-temperature fans, the density ratio is much lower at 40°C; therefore, at this temperature the pressure head generated by the high-temperature fans may not meet the system’s requirements.
That can’t be right. According to what you said, the higher the density, the greater the wind pressure; therefore, the wind pressure at 40°C should be higher than the value indicated on its current nameplate! Because the density of the medium at present is much greater than that of air at 200°C
This high-temperature fan has been finalized in its design; in other words, it was designed based on the parameters under high-temperature conditions, and it operates within its efficient range under those conditions. If it is operated under conditions of 40°C, it may not operate in the high-efficiency range, or it might not be able to function at all.
This high-temperature fan has been finalized in its design; in other words, it was designed based on the parameters under high-temperature conditions, and it operates within its efficient range under those conditions. If it is operated under conditions of 40°C, it may not operate in the high-efficiency range, or it might not be able to function at all.
It depends on how much pressure you have to determine whether this fan is suitable. For example, at 200 degrees the density is half that of air at 20 degrees; if the pressure and flow rate specified in the system design are 4000 Pascals and 2 cubic meters per second, then the operating point indicated on the fan’s nameplate should be 2000 Pascals and 2 cubic meters per second. If it is a different pressure value, it means that the operating condition you are seeking does not fall on the fan’s performance curve; the flow rate will either be greater than 2W or less than 2W. In such cases, you can adjust it by using variable frequency control or by adding valves in the piping system, so as to achieve the flow rate you have designed.
It depends on how much pressure you have to determine whether this fan is suitable. For example, at 200 degrees the density is half that of air at 20 degrees; if the pressure and flow rate specified in the system design are 4000 Pascals and 2 cubic meters per second, then the operating point indicated on the fan’s nameplate should be 2000 Pascals and 2 cubic meters per second. If it is a different pressure value, it means that the operating condition you are seeking does not fall on the fan’s performance curve; the flow rate will either be greater than 2W or less than 2W. In such cases, you can adjust it by using variable frequency control or by adding valves in the piping system, so as to achieve the flow rate you have designed.