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Laboratory
Facilities
Flexible
Airflow Control Solutions
for Every Application
| Laboratory
Facilities Documentation |
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2006 English Laboratory Sourcebook
Fourth Edition
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The
third edition of the Laboratory Sourcebook contains
updated Celeris product information. It presents
an overview of design issues critical to controlling
airflow in laboratory environments, including system
response time, accuracy, and pressure independence.
It also discusses how applying diversity to laboratory
design can save energy and permit downsizing of
mechanical systems.
Order
your copy now!!
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| Laboratory
Standards & Guidelines
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A
compilation of excerpts from many of the applicable
laboratory standards and guidelines used within
the industry today. The intent of this piece is
to provide the owner, engineer, architect, or laboratory
user an overview of those standards and/or guidelines
that are applicable to the design and/or use of
today's laboratory. Individuals should consult all
relevant local, state, and federal building codes
to define what applicable standards and guidelines
from this piece might pertain to a particular facility.
Order
your copy now!! |
What
is the true cost of static pressure? |
What
is the cost of static pressure?
Compares the static pressure requirements of terminal
boxes with venturi valves. Also stresses that while
terminal boxes can maintain lower static pressure
on paper, the cost savings from lower static pressure
is minimal and far outweighed by the energy savings
from the superior turndown of the Phoenix Controls
venturi valve. PDF File (146 KB) 08/06 |
Usage
Based Controls® (UBC)
Only
Phoenix Controls offers a unique approach to laboratory
airflow control called Usage Based Controls (UBC) that
modulates hood flows based on the presence or absence
of a fume hood operator. UBC can be used in both two-state
and variable air volume applications.
Usage Based Controls (UBC) from Phoenix Controls has been
designed to significantly reduce the risk in downsizing
the building’s mechanical equipment. UBC senses the actual
presence at the fume hood of an operator, not just sash
position alone. The illustration below describes the concept
of Usage Based Controls. Even though an operator may leave
a sash fully open all day, the amount of time the hood
is occupied is typically less than one hour. Thus, the
fume hood would operate in the standby mode of 60 fpm
most of the day instead of 100 fpm, resulting in a 40%
reduction in airflow. Furthermore, if sashes are closed,
up to 80% reduction in airflow is realized.
Click
here to order more information on the UBC System.
Download the
UBC Literature sheet
View
a demonstration of UBC
(Proven Low Airflow Control Solutions Video)
Variable Air Volume UBC
Phoenix UBC provides an intelligent form of variable volume
control for fume hoods. UBC eliminates the disadvantages
of not closing sashes, yet maintains safe face velocity
levels while minimizing the HVAC burden. The concept is
quite simple: use a higher face velocity (e.g., 100 fpm)
when an operator is in front of the hood creating turbulence,
but reduce the flow to a safe level (e.g., 60 fpm) when
no operator is present. The illustration below represents
a typical UBC system. Room pressurization is maintained
by adjusting the make up air at a slightly lower rate
than the exhaust. Minimum ventilation and proper temperature
control may require the use of a general exhaust valve
—where the exhaust air rate is increased to overcome the
added supply requirements.
Benefits
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Diversity—the
sizing of mechanical equipment based on partial load—is
dramatically improved.
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Reduce HVAC capital costs by assuring reductions in
airflow, even when sashes are left open.
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Lower
and more predictable energy costs.
- Increase
lab safety due to the reduction in supply air currents
that often affect fume hood containment.*
*
Caplan, Knowlton. P.E.; Knutson, Gerard W., "The effect
of Room Air Challenge on the Efficiency of Laboratory
Fume Hoods," ASHRAE Article No. 2438.
Laboratory
Facilities Documentation
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Variable
Air Volume (VAV) Applications
Phoenix
Controls offers sash sensing, pressure independent venturi
air valves, and volumetric room flow controls for VAV
applications. The illustration below shows a VAV lab with
Phoenix Controls components.
Benefits
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Superior
flow control with fast, stable adjustments over large
flow changes.
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Low
maintenance devices.
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Eliminates
the need for re-balancing. The pressure independent
system maintains steady flow through system changes,
filter loading, and HVAC degradation.
- Low
sound power levels.
When Phoenix valves are used in variable volume systems
they provide the benefits listed above. However, the disadvantages
of not closing sashes still remain. To address these concerns,
Phoenix Controls offers a unique approach to
variable volume laboratory airflow control—Usage Based
Controls (UBC).
Laboratory
Facilities Documentation
Two-State
Applications
Phoenix
Controls offers the uniquely engineered Accel®
II pressure independent air valves for use in two-state
applications to ensure years of repeatable high-performance
control.
Two-state
UBC
Phoenix UBC provides an intelligent form of two-state
control for fume hoods that eliminates the disadvantages
seen with traditional switching mechanisms. For increased
safety, UBC switches to high flow whenever an operator
is in front of the fume hood. The system then switches
to low flow when the operator is absent for greater energy
savings and design diversity.
Benefits
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Simple
flow control with fast, stable adjustments.
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Eliminates
the need for re-balancing. The pressure independent
system maintains steady flow through system changes,
filter loading, and HVAC degradation.
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Increases
safety – face velocity is maintained at a safe level
at all times.
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Sizing
HVAC system with diversity is more predictable
Switched
Two-State
The
Illustration below shows a sash switch control option
for a two-state laboratory.
Benefits
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Simple
flow control with fast, stable adjustments.
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Low
cost of controls compared to VAV.
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Eliminates
the need for re-balancing. The pressure independent
system maintains steady flow through system changes,
filter loading, and HVAC degradation.
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Flexible
monitoring. Use either a Phoenix monitor or the hood
manufacturer’s model.
Laboratory
Facilities Documentation
Constant Volume (CV) Applications
Constant
Volume Approach
Phoenix
Controls offers products to maximize performance in constant
volume laboratories. The illustration below shows typical
CV laboratory devices with Phoenix Controls components.
Benefits
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Accurate,
stable flow control.
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Eliminates
the need for re-balancing. System is pressure independent
and maintains steady flow through system changes,
filter loading, and HVAC degradation.
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Flexible
monitoring. Use either a Phoenix monitor or the hood
manufacturer’s model.
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No
wiring or tubing for control.
The
illustration below shows several constant volume laboratory
exhaust devices controlled by pressure independent constant
volume changes.
Laboratory
Facilities Documentation
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