heat-timer: save energy while improving comfort in ... · hss temperature greater than 150°f...
TRANSCRIPT
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HEAT-TIMER® Save Energy while
improving comfort in Multi Family Buildings
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Objectives • Proper control methods for Steam
heat and hot water heat • Basic multiple boiler control options • Using Communication Options to
save energy. Both on direct fuel usage and through information to better maintain equipment.
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In heating: What can we control ? • Flow (On Off)
– Steam System: steam temperature (non vacuum) remains relatively constant.
• Control the flow of steam based on outdoor air
• Temperature of heating medium – Hydronic system: Water is easily controllable and
we can do this in numerous ways based on system and boilers being used .
• Vary the water temperature to the radiators based on outdoor air.
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Heat-On
Heating SystemSensor (HSS)
Reaches150 Degrees
HSS TemperatureGreater Than
150°F
Heat-Off
HSSTemperatureBegins to Fall
60 Minute Cycle
Heat-Off
Thermal Lockout Active
Heat-On
HSSTemperature
Continues to FallBelow 150°F
HSS Falls Below125 °F
Differential)
EstablishingHeat
EstablishingHeat
Steam Cycle Concept Thermal Lockout and Differential
EXAMPLEHeating System Sensor Adjustment (XYZ) 150°Heating System Sensor Differential -25°Thermal Lockout ONCycle Minutes 60
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Hot Water Reset
• Varies the system water temperature based on outdoor air – I.e: Water sent to radiation
increases as it gets colder outside
• Does NOT turn pump off and on
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Typical Hot Water Reset Methods
• Direct Single Boiler reset – NOTE: Make sure that boiler can be
operated at lower temperatures – Do not recommend when DHW is
supplied via coil in boiler. • Direct Multiple Boiler reset • 2-way , 3-way or 4-way Motorized
Valve
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IMPORTANT Steam to Heat Exchanger
BURNER
HOT WATERDOMESTIC
BOILERSTEAM HEAT EXCHANGER HEATING SYSTEM
SENSORPUMPHEATING LOOP
TO
HEAT-TIMER
HWR
OUTDOORSENSOR
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Design Temperature only required on very cold day
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Reset Ratio Ranges
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Water Temperature Offset W
ater
Tem
pera
ture
(in
°F)
140
130
120
110
100
170
160
150
180
190
200
210
220
E Res
et Rati
o with
0° O
ffset
90
80
Outdoor Temperature (in °F)70 405060 0102030 -10 -20 -30
E Res
et Rati
o with
-20°
Offset
E Res
et Rati
o with
+20°
Offset
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Sequencing Controls for Multiple Boilers
• To maximize multiple boiler efficiency you must control them as a team.
A) Not all types of boilers should be controlled in the same fashion.
B) When selecting a control, make sure you know what type of burners you have and not just the number of boilers.
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• On/ Of f Bur ner s – Fl ame i s OFF – Fl ame i s ON
• Lo/ Hi Fi r e Bur ner s – Fl ame i s OFF – Fl ame i s Low – Fl ame i s Hi gh
• Al so 3 st age and 4 st age bur ner s
BOILER
OFF BOILER
ON
BOILER
OFF BOILER
Low BOILER
High
On/Off and Lo/Hi Burners
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• Full Modulation Burners allow the flame to be adjusted anywhere from low to high fire.
BOILER
OFF BOILER BOILER BOILER
Low BOILER BOILER
High
Full Modulation Burners
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TYPICAL CONTROL SYSTEM FOR MULTIPLE FULL MODULATION
BOILERS
Modulating Control
Hi Limit Control
Manual Reset Control
Modulating Controls
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Control Of Multiple Full Modulation Boilers with MultiMod
Hi Limit Control
Manual Reset Control
ONE SYSTEMSENSOR
Modulating Control
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HI FIRE
LEAD BOILER
Adjustable Modulation Start Point (50 to 100%)
HI FIRE
Boiler # 1
Boiler # 2
Boiler # 3
Modulation Increasing
Modulation Increasing
1 % 50 % 100 %
1 % 50 % 100 % Modulation Increasing
Adjustable Modulation Start Point (50 to 100%)
1 % 50 % 100 %
Typical Sequence of Operation for Higher Mass Boilers w/ Modulating Burners
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0
20
40
60
80
100
Boiler # 1Boiler # 2Boiler # 3
As Load is Increasing
Boiler #1 = 40% Boiler # 1 = 20%
Boiler # 2 = 20%
Boiler # 1 = 40%
Boiler # 2 = 40%
Boiler # 1 = 25%
Boiler # 2 = 25%
Boiler # 3 = 15%
Boiler # 1 = 40%
Boiler # 2 = 40%
Boiler # 3 = 40%
Typical Parallel Loading Mode for Lower Mass Condensing Boilers
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Using Communication Options to save energy.
Both on direct fuel usage and through information to
better maintain equipment.
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Heat-Timer Internet Control Management System (ICMS)
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Internet Controls Capabilities Capabilities: Web Based Application.
No On-site server is required No local software is required on personal computer
Wireless Space Sensors allow control to AUTOMATICALLY fine tune heating reset curve based on desired space targets
Alarm E-mail/Text Message capability Can alarm on any monitoring point
Reporting Capability Standard Reports, Custom reports
Additional Sensor Monitoring
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Sensor Monitoring Benefits • Space Temperature Inputs (Wired and Wireless)
– Allows the HTC control to fine-tune the reset curves based on space feedback and desired space temperatures.
• Burner Lockout – Alerts management when burner goes into a safety lockout condition
• DHW Temperature Inputs – Alerts management to possible dangerous high temperature DHW
• Boiler DHW Coil Temperature – Alerts management to possible dirty coil
• Oil Tank Monitoring – Alerts management to oil deliveries and consumption
• Oil Filter Monitoring – Alerts management to a dirty oil filter
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Additional Sensor Monitoring Benefits • Boiler Feed Water (Water Meter)
– Alerts management to potential boiler damage due to excessive make up water. Either due to numerous blow downs or leaks in piping system.Can assist in monitoring boiler chemical levels
• Boiler Stack Temperature – Alerts management to a dirty boiler which can decrease boiler
operating efficiency • Sump Pump Failure
– Alerts management to a possible flood condition or damaged sump pump
• Conductivity Sensor – Monitor boiler chemical level for both scaling condition or
corrosive condition. • Can monitor alarm outputs from others controls
– I.e.: Heat-Timer snow Melt control in alarm condition.
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Alarm Capabilities
All sensors have alarm capability (e-mail or text message)
• The alarm can be sent to multiple people – This provides the capability of immediate notification in
critical situations.
• Less critical or maintenance alarms can be e-mailed to the appropriate personnel – Sample Critical Alarm = Control in bypass, boiler in lockout – Sample Maint. Alarm = High stack sensor
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10
9
8
7
6
5
4
3
2
1
MPCNM
T1
T3
T5T5A
SS
SS
SS
SS
T5B
Wireless Space Sensor
Example
10 Story Building
60 Units
10% Rule = 6 Apt Space Sensors
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WIRELESS DIAGNOSTICS
Wireless Reception
Space Temps
Battery Indication
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BUILDING 3D VIEW
Wireless Paths
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Click for Control Settings
Click to View Boiler Room
Click to View Histories
Click to View Alarms
Click to View Sensors
Click to View Over-rides
Click to Set Schedules
SHORTCUTS
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Monitor Multiple Building Alarms on One Screen
Buildings in Alarm Condition
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MPC PLATINUM (Steam) Cycle Timeline
Vari-Boost
Fast Cool Down
SPACE Lockout
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HISTORY (Multi-Temp. Sensors)
Outdoor Temp
Space Temps
Heating Sys Sensor