Basic Documentation
Table Of Contents
- About this Application Guide
- Chapter 1–Introduction
- Chapter 2–Goals of the Laboratory Environment
- Chapter 3–Unique Ventilation Needs of a Laboratory Facility
- Chapter 4–Ventilation Systems Classification
- Chapter 5–Laboratory Facility Exhaust Systems
- Chapter 6–Laboratory Containment Units - Ventilation
- Chapter 7–Room Ventilation, Makeup Air, and Pressurization Control Systems
- Chapter 8–Laboratory Temperature and Humidity Control Systems
- Chapter 9–Laboratory Emergencies - Ventilation System Response
- Chapter 10–Laboratory Ventilation System - Validation
- Chapter 11–Laboratory Ventilation System - Commissioning
- Glossary
- Index
Glossary
atmospheric pressure
Pressure of atmospheric air that is normally measured by a barometer in units of inches of
mercury. Applies to ventilation systems. See standard atmosphere.
biological safety cabinet (BSC)
Enclosure that protects the user from airborne organisms (virus, bacteria, toxins) and other
elements (gases, chemical fumes, etc.) in conjunction with scientific work on biological
substances. Protects biological specimens from contamination by airborne impurities.
Biological safety cabinets are classified from Class I for low hazard work to Type III (glove
box type units) for the highest level of hazard, such as highly contagious diseased tissue.
Also called Biosafety Cabinet or BSC.
British Thermal Unit (Btu)
Quantity of heat. Adding one Btu increases the temperature of one cubic foot of air by
approximately 65 degrees Fahrenheit. Adding one Btu to one pound of water increases its
temperature by approximately 1 degree Fahrenheit. Applies to ventilation systems.
Btu compensation
Room temperature control strategy designed to avoid temperature swings in a zone that is
subject to large and sudden changes in the ventilation airflow rate.
bypass fume hood (constant volume bypass fume hood)
Constant volume type of chemical fume hood that minimizes the large variation in face
velocity that would normally occur as the sash is positioned between fully closed and fully
open.
closed loop control
Control arrangement where the controlled variable (such as temperature, pressure, cubic feet
per minute, and humidity) is continually measured by a sensor that provides an input to the
controller. Closed loop control enables the most precise control since the controller has
instant feedback of the actual results of its control action. See open loop control.
constant air volume (CAV)
Ventilation system that does not change the volume or airflow rate that is supplied to or
exhausted from the rooms served. See variable air volume.
degree day
Difference between the average outdoor temperature for a 24-hour day and 65 degrees
Fahrenheit. If the average is less than 65 degrees Fahrenheit, it is a heating degree day; if
the average is greater than 65 degrees Fahrenheit, it is a cooling degree day. (A day where
the outdoor temperature averaged 60 degrees Fahrenheit would be a 5 degree heating day.)
Degree days are useful for comparing energy usage, estimating fuel needs, etc.
96 Siemens Building Technologies, Inc.