Title:
METHOD AND APPARATUS FOR CONTROLLING FUME HOOD FACE VELOCITY USING VARIABLE BYPASS RESISTANCE
Document Type and Number:
Japanese Patent JP2544583
Kind Code:
B2
Abstract:
PURPOSE: To control a fume hood accurately by employing flow coefficient in order to compensate for resistance to air flow through a grill means overlying a bypass opening.
CONSTITUTION: A fume hood face velocity controller 20 using variable bypass resistance comprises means for detecting the position of a movable sash door 76 and generating a position signal, a first size determining means for determining the size at the uncoated part of a front opening depending on the position signal from the position detecting means, and a second size determining means for determining the size at the unclosed part of a bypass opening 75 depending on the position signal from the position detecting means. The determined size is adjusted by a flow coefficient and the resistance to air flow due to a grill means is compensated thus determining the effective size at the unclosed part of the bypass opening 75.
Inventors:
SUTEIIBUN DEII JEIKOBU
JEEMUSU JEI KUUGAN
SUTEFUAN JII PETORASU
JEEMUSU JEI KUUGAN
SUTEFUAN JII PETORASU
Application Number:
JP6631894A
Publication Date:
October 16, 1996
Filing Date:
April 04, 1994
Export Citation:
Assignee:
RANDEISU ANDO GIA PAWAAZU INC
International Classes:
B08B15/02; F24F7/007; F24F7/06; B01L1/00; G05D7/06; (IPC1-7): F24F7/007; B01L1/00; F24F7/06
Attorney, Agent or Firm:
Yu Sanada