FD Fan Analysis

Tale Of The Tool
A Variable-Frequency-Drive (VFD) analysis will be performed on the fan-system in any of three possible configurations: (1) the current single-fan setup, which provides the operational data used to model the other configurations; (2) a simulated dual-fan parallel arrangement, assessed to enhance capacity and provide redundancy; and (3) a simulated dual-fan series arrangement, evaluated to improve maintenance access and system reliability. The analysis will examine each setup’s performance across varying speeds--evaluating metrics such as operational efficiency, stability-region flow rates, and power requirements.

In addition to supporting Variable Frequency Drive (VFD) functionality, this tool enables the determination of a fan’s airflow using the two distinct methods outlined below, where ultimately, the method of choice will be dictated by the practical realities of equipment availability and the need for versatile approaches in the field.

Supplementing the VFD results, is an accompaniment of supporting data that can be leveraged in the design and decision-making processes--to the extent they impinge, partially or wholly, on the objective of the analysis.
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Besides determining the air flow based on the furnace’s volumetric analysis—applicable to cases where the fan supplies combustion air to a furnace—the results also include the vapor dew point, along with the fan’s mechanical and static efficiencies.
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This analysis determines the air flow rate based on the temperature rise across the fan. As secondary results, computed values of the fan's mechanical efficiency, as well as its static efficiency, are also included for completeness.
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