Method for Monitoring Duct Ventilation

• US 20070251331A1
• Filed: 05/17/2005
• Published: 11/01/2007
• Est. Priority Date: 06/16/2004
• Status: Abandoned Application

• Current Assignee: L'Air Liquide Societe Anonyme Pour L'Etude et L'Exploitation Des Procedes Georges Claude (L'Air Liquide SA)
• Original Assignee: L'Air Liquide Societe Anonyme Pour L'Etude et L'Exploitation Des Procedes Georges Claude (L'Air Liquide SA)
• Inventors: Charlat, Pierre
• Application Number:
  US11/569,792
• Publication Number:
  US 20070251331A1
• Time in Patent Office: Days
• US Class Current: 73/861.770
• CPC Class Codes: F24F 11/0001 for ventilation F24F11/30 takes precedence
• CPC Class Codes: F24F 11/77 by controlling the speed of ventilators
• CPC Class Codes: G01F 1/80 operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
• CPC Class Codes: H01M 8/04597 of auxiliary devices, e.g. batteries, capacitors
• CPC Class Codes: H01M 8/04888 of auxiliary devices, e.g. batteries, capacitors
• CPC Class Codes: H01M 8/0662 Treatment of gaseous reactants or gaseous residues, e.g. cleaning
• CPC Class Codes: Y02B 30/70 Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
• CPC Class Codes: Y02E 60/50 Fuel cells

Abstract

A method for monitoring ventilation in a duct (3) by inserting therein a secondary fan (5) have a low self-contained rotation speed, which method comprises a step of continually measuring an image value (v_i) of the current flowing through the motor in order to compare same with a predetermined value and generate a correction signal. The method is particularly useful for ventilating a chamber (2) containing a PEM fuel cell (1).

Claims

1-7. -7. (canceled)

8. A method for monitoring ventilation in a duct, wherein a secondary fan having a brushless direct current motor is inserted in the duct, a minimum voltage is applied to the motor sufficient to ensure a continuous rotation, an image value of the current passing through the motor is measured continuously and it is compared with a pre-established value in order to generate a correction signal.

9. The method of claim 8, wherein the image value is an average value of the current.

10. The method of claim 8, wherein the image value is the frequency of the peaks of the current.

11. The method of claim 8, wherein the correction signal is an alarm signal.

12. The method of claim 8, wherein the correction signal is a signal to vary the voltage applied to the motor.

13. The method of claim 8, for the ventilation of an enclosure containing a source of emission of gaseous components whose concentration must be monitored.

14. The method of claim 13, wherein the source of emission is a fuel cell.