Editorial
Contact: Mike Leeming
Parker
Boiler: National Sales Manager
Direct Tel
323-727-9800
Email:
mleeming@parkerboiler.com
Parker Boiler: Industrial Boiler
Specialists
Web site www.parkerboiler.com
WHITE PAPER
SUBJECT: EFFICIENT HOT WATER SYSTEMS for industrial boilers
ATTN: EDITOR
FOR IMMEDIATE RELEASE Wednesday,
February 06, 2008
In this years’ August ASHRAE
Journal, Kent Peterson, ASHRAE’s current 2007-2008 President, wrote an
excellent inspirational article motivating those of us in the HVAC Industry to
do our best to create sustainable energy efficient designs. I have had the pleasure of working with Kent
over the years and I can tell you his designs do push the technology envelope
and challenge us to build better, more efficient, clean burning and sustainable
equipment.
Case in point is Kent’s
design for 10 of our T6800LR Low NOx Hot Water Boilers which have been on line
at CSU Long Beach Central Plant for the last 12 years. These boilers achieve efficiencies of over
84.5% while running within the terms of their SCAQMD permit.
While thinking about the
article and our experience on hot water systems, I was reminded that the
following items must be integrated correctly for a system to operate as it was
intended.
We are in the fortunate
position of getting involved in the design of all types of hot water and
thermal fluid systems and we have developed the following list of questions or
thoughts which hopefully you’ll consider as you embark upon your next hot water
system design:
I - Boiler: Important
Selection Criteria
§
Safety
§
Application
§
Operational
Temperatures
§
Efficiency
§
Price
§
Simplicity
§
Durability
§
Ease of
Maintenance
§
Size constraints
§
Operating hours
§
Pressure/Temperature
Requirement
§
Venting
requirement
II - Type of System
§
Number of boilers
versus size of load (for instance, 1 boiler @ 100% load, 2 boilers @ 50% or 75%
of load)
§
Design
Temperature and Temperature rise through boiler
§
Coil DT and type
§
Number & GPM
of Pumps
§
Number of pumps
to normally run
§
VFD Pump Operation
§
Methods of
resetting Hot Water System Temperature (if desired)
-
On boiler
-
By primary
secondary pumping
-
3 way valve
-
By BAS
§
Limit of HWS
& HWR Temperatures
§
Ways to maintain
boiler flow
-
3 way valves at
terminal units
-
End of main(s)
bypass (each floor)
-
End of main
circuit setter
-
Bypass valve
(pressure actuated)
-
Primary/secondary
pumping
-
Run around pump
on boiler
§
Flow control
valves on multiple boiler jobs
§
Method and
control strategy for starting and stopping system
III - DDC Interface/Controls
§
Start – Stop
§
Alarm D.C. for
any failure
§
Burner On Status
Indication
§
Operating Control
Function
§
Control of
Modulating via 2-10 VDC or 4-20 ma signal
§
Flow Switch
§
Reset of HWS
Temperature from BAS
§
Lead lag system
for boilers (normal or parallel lead lag control)
By addressing all of the
above you can be assured that proper consideration will be given to create an
efficient effective system.
In many instances, you are
dealing with an existing building which forces your hand in type of system,
venting, and piping arrangement.
Parker
Boiler manufactures a full range of steam boilers,
hot water
boilers, thermal
liquid heaters, indirect water
heaters, low NOx
burners, water
softeners, feedwater
return systems, feedwater
deaerators, blowoff tanks,
storage
tanks and boiler
room accessories.
For more information, please contact Mike Leeming Tel 323-727-9800 Telephone or Fax 323-722-2848 or email sales@parkerboiler.com Please visit www.parkerboiler.com