In a centrifugal fan, when the air volume is operating within the designed conditions, the wind pressure does not reach the required level. What could be the reason for this?
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I have a question: When a centrifugal fan operates at the designed operating conditions, its wind pressure is lower than the value indicated in the curve provided by the manufacturer. What could be the reason for this?
First, check to see if there are any air leaks
First, check the airtightness of the relevant pipelines, as well as the measuring element used to determine the air flow rate – whether it is a Venturi tube or an orifice plate, etc. Different throttling elements result in different pressure losses in the pipelines, which in turn affect the air pressure. If the above issues do not exist, design deviations may be the cause. Since the air volume is directly proportional to the square root of the pressure difference between the inlet and outlet, it is somewhat questionable that the flow rate is normal while the partial pressure does not reach the required level. Furthermore, you should start by checking the pressure sensing element to see if the pressure gauge is measuring accurately. .
Is it a centrifugal fan? Is the position of the measurement point correct? Does the air volume meet the design requirements or exceed them? Was there an excessive design margin for pressure loss in the subsequent pipelines during the design phase?
At present, the air flow is normal and the current is 70% of the rated value; however, the moisture content in the gas is very high, and the humidity is high. I wonder if this is related to such high humidity
Theoretically, humidity has a very minimal impact on airflow and pressure; it can be considered to have no effect, affecting only power. How is it determined what normal air volume means, as you mentioned? Are there adjustment devices such as imported guide vane regulators?
During operation, the air volume is the same as the designed value; it’s just that the wind pressure does not reach the required level. Does humidity have little impact on wind pressure?
According to the fan selection software, humidity is not a required input parameter. Theoretically, with such a low head pressure from the fan, humidity can only affect the specific volume of air, that is, its density; it has a slight impact on power, but should have no effect on head pressure. It is recommended to verify the wind pressure measurement and confirm the dynamic pressure being measured Static pressure? Total pressure?