Transcript Exquisite Heat

Exquisite Heat
For Steam Boilers
Time based system
 Thermostat Demand Analysis over time
will determine the length of burner fire
time of the boiler.
 This will remove the leads and lags
associated with the over and under
heating in steam boiler comfort.
Fire timing
 Programmable limits of maximum and
minimum burner fire times.
 Time limit minimums will avoid short cycle.
 All firings are thermostat initiated, and
controlled by system pressure limits.
 Start up fire times are determined by how long
it takes to meet system pressure controls.
Fire time adjustments
 As the controller demand analysis
(previously discussed) resets fire times,
from hour to hour. Burner fire time will be
increased or decreased in order to meet
the ideal thermostat demand ratio. (60%).
On mild days this may well allow comfort
satisfaction at lower than system set
pressure limit at the boiler.
Algorithm
Start-up fire time = the time it
takes to satisfy pressure limit from
a cold start. (15-90 minutes)
Boiler pressure controls and
thermostat satisfaction can over
ride the initial start up time.
Proper Boiler Firing
 It is important to know that the boiler
should be making steam within the 90
minutes. If the pressure is not made:
 Check boiler burner rate is high enough
to produce good steam.
 Check pressure gauges and pressure
control.
 Check piping insulation, vents, traps,
condensate return lines, flue gas
analysis, and boiler water level.
Minimum burner fire time
 The amount of time it takes to recover to
steam delivery after a break.
 10-40 minutes
 Minimum
= Fire Time 10 min.
Alternative Break Time
 In addition to a fixed break time, a
proportional break is provided if
convenient.
Break between fire times
Fire Time * .3
If burner time is calculated to 40 minutes
the break will be (40*.3 ) =12 minutes.
If burner time is calculated to 12 minutes
the break will be 10 minutes. (remember
minimum)
Alternate break method
 The break time can be a fixed time or
proportional.
 Each building has its own rhythm.
 Factory settings can be adjusted if
needed by the installer.
Break time
 The goal is to have the thermostat
satisfied into the break.
 There are savings and comfort
advantages as the thermostat is satisfied
after the burner is off.
 The thermostat overrides all calls for
burner firing.
Start up Time
 If the thermostat does not call for heat
more than for one hour the controller
adjusts fire time back to Start up time,
which will be initiated by thermostat
activation. Should the thermostat be
satisfied at any time the boiler will be
shut down. The controller will take this
into consideration in the next calculation.
All variables are
changeable
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Maximum Burner Time 15-90 minutes
Break time ratio .2, .3, .4, .5, of Burn time
Minimum Break .3 max Burn time
Fixed break time for condensate.
Start up burn time: 20, 30, 45, 60, 90 min.
Min Burn time : .3 burn time or ten
minutes.
 Ideal demand ratio .5, .6, .7, .8
 Analysis time: 40, 60, 90 minutes
Algorithm
 Thermostat activity analysis within the
hour will determine the increase or
decrease adjustment of the burner fire
time in the following hour.
 Actual demand ratio vs. Ideal demand
ratio determines + or - to length of fire
on time, adjustment from previous hour
calculated fire time.
Fire Time change
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Actual demand ratio = 70
Ideal Demand ratio = .60
(.70-.60)=.10 x 10= 1 time change factor
Time increment factor= 2 minutes
Previous hr. fire time 30 minutes
1 time chg.. factor x 2 min = +2 min
Prev. fire time 30min + 2 min= 32 min
New Burner fire time 32 min (increase)
Steam Systems require
annual maintenance
inspection and service by
a professional steam
expert and periodic
weekly owner system
checks.
Weekly Checks
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Boiler water level. 1/3-1/2 water in fill glass
Pressure monitoring .5-2.0 lbs
Blow down auto refill devices to remove rust
Watch it cycle for a full two firings to verify
pressuretrol safety operation. Check for short
cycling.
 Check for continuous boiler firing. (longer than
40 minutes) This means you need to talk to your
boiler service to explain.
 Check that all radiation is getting steam.
System Service
 Steam is delivered as soon as it is
generated. Traveling at great speed it will
satisfy BTU demand quickly. It is most
important that all system components are in
good working order as designed. It can not
be overemphasized, that complete
inspection service and repair maintenance
be done, annually by a professional.
Boiler Firing
 Boiler firing rate and oil nozzle size must be
proper for the boiler to have efficient heat
exchange from the fire to the waterside. If the
nozzle is too small the boiler will take forever to
heat. Steam pressure should be met in less
than 30 minutes. If not have the boiler fire size
checked by a professional boiler person. See
manufacturers suggested gallons / hour. This
information can be found at manufacturers
website.
System Insulation
 Many systems have had the asbestos
insulation removed. Few replace the
insulation due to the added expense.
With fuel prices going up, insulation
return on investment is becoming very
attractive. The system was designed to
work with insulated pipes.
 Most steam systems can be reinsulated
for 5 dollars per pipe foot.
 You are wasting the heat in the pipes if
you do not.
System Components
 Proper boiler piping measurement check.
 Testing cleaning and repair of:
 air vents, traps, safety controls,
chimney inspection, flue gas analysis,
heat exchange cleaning, make up water
supply rate, piping insulation,
condensate return systems and boiler
water, fuel supply and storage.
 Proper venting of boiler room for fresh air
and fire prevention.
Outdoor temperature
 This is already compensated for by the
Exquisite Heat indoor reset technology that
adjusts the boiler for the precise replacement
of heat at the thermostat. The thermostat
takes all heat loss into consideration from
inside the building where the people are.
References
 We strongly urge all owners and
managers of steam systems to begin
their search for complete information
about their steam heating equipment with
a visit to Dan Holohans’ web site :
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http://www.Heatinghelp.com
 Dan has a great library from beginner to
advanced for heating information.
Comfort
 Steam heat now has the
opportunity to be comfortable
and efficient with the intelligent
management offered by
Exquisite Heat control.
 www.Exqheat.com 914-588-4791
 John Cockerill US Patent: 6,402,043
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Rev 09-09