A fan which ventilates a small mine run at 500 rev/min. The airflow is measured at 150m3/s when the pressure developed across the fan is 0,85kPa. The natural ventilation pressure of the mine is 0,40kPa. The mine requires only 100m3/s airflow on Sundays and the fan is to be slowed down to meet the requirement. The efficiency remains at 75%. 2.2.1 Determine the new speed required for Sundays. 2.2.2 Calculate the annual savings in electricity costs if the tariff is R0,21kWh. 2.2.3 Comment on any savings in the maximum demand.
A fan which ventilates a small mine run at 500 rev/min. The airflow is measured at 150m3/s when the pressure developed across the fan is 0,85kPa. The natural ventilation pressure of the mine is 0,40kPa. The mine requires only 100m3/s airflow on Sundays and the fan is to be slowed down to meet the requirement. The efficiency remains at 75%. 2.2.1 Determine the new speed required for Sundays. 2.2.2 Calculate the annual savings in electricity costs if the tariff is R0,21kWh. 2.2.3 Comment on any savings in the maximum demand.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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2.2 A fan which ventilates a small mine run at 500 rev/min. The airflow is measured at 150m3/s when the pressure developed across the fan is 0,85kPa. The natural ventilation pressure of the mine is 0,40kPa. The mine requires only 100m3/s airflow on Sundays and the fan is to be slowed down to meet the requirement. The efficiency remains at 75%.
2.2.1 Determine the new speed required for Sundays.
2.2.2 Calculate the annual savings in electricity costs if the tariff is R0,21kWh.
2.2.3 Comment on any savings in the maximum demand.
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