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CHELMSFORD PUBLIC SCHOOLS:
OVERVIEW
HEATING, VENTILATION & AIR
CONDITION SYSTEM
&
ENERGY MANAGEMENT SYSTEM
Board of Selectmen Presentation 12.19.16
INTRODUCTION
Kathleen Canavan, AIA – Public Facilities Manager
Christopher Illsley, BSME – Energy Manager
Gary Persichetti, CFM – DPW/Facilities Director
Explain the Heating, Ventilation, and Air Conditioning
(HVAC) and Energy Management System (EMS) for
the Chelmsford Public Schools
STATEMENT
Welcome
Acknowledgement
HVAC SYSTEMS
HVAC OVERVIEW
1. Heat Generation Equipment
A. Boilers – Natural Gas Fired
B. Roof Top Units – Natural Gas Fired
2. Distribution System
A. Hydronic (Water) or Steam – Piped System
B. Forced Air – Ducted system
3. Local Delivery Devices
A. Air Handling Units, Heat and Ventilation Units, Unit Ventilators, Cabinet
Unit Heaters, Fin Tube Radiators, Reheat Coils and VAV Boxes
4. Local Exhaust Systems
A. Exhaust Fans and Vents
Chelmsford High School S.F. – 285,882 BUILT – 1974 # of Rooms – 120 Classrooms
1. Heat Generation Equipment
A. 5 AERCO Boilers – 2 Million BTU/Hr
B. 23 Roof Top Units
2. Distribution System – Combination
A. Hydronic – Piping to UVs, Cabinet Heaters, FTRs
B. Forced Air – Gyms, Cafeterias, Classrooms with Air Ducts
3. Local Delivery Devices
A. Unit Ventilators (75) and FTRs – Second and Third Floor Wings, Art Studios, 318-325
B. 2 Air Handling Units – First Floor Offices and PAC (behind stage)
C. Air Vents and VAVs – Gym, Science rooms, Second and Third floor inner core rooms, Offices, Library
4. Local Exhaust System
A. Exhaust fans in misc. classrooms and bathrooms
Chelmsford High School – Boiler Plant
Chelmsford High School – Roof Top Units
McCarthy Middle School S.F. – 156,732 BUILT – 1957 # of Rooms – 75 Classrooms
1. Heat Generation Equipment
A. 4 AERCO Boilers – 2 Million BTU/Hr
B. 1 Roof Top Unit + 4 Electric RTUs (Pods)
2. Distribution System – Combination
A. Hydronic – Piping to UVs, Cabinet Heaters, FTRs
B. Forced Air – Gyms, Auditorium and Library
3. Local Delivery Devices
A. Unit Ventilators (87) and FTRs – Classrooms and Offices
B. 4 Air Handling Units – Gym, Auditorium, and Library (with Reheat Coils)
4. Local Exhaust System
A. Exhaust fans in misc. classrooms and bathrooms
Parker Middle School S.F. – 121,873 BUILT –1965 # of Rooms – 69 Classrooms
1. Heat Generation Equipment
A. 4 AERCO Boilers – 2 Million BTU/Hr
B. 1 Roof Top Unit, 12 Electric RTUs (Pods)
2. Distribution System – Combination
A. Hydronic – Piping to UVs, Cabinet Heaters, FTRs
B. Forced Air – Gyms, Cafeteria, Pods and Library
3. Local Delivery Devices
A. Unit Ventilators (57) and FTRs –Classrooms and Offices
B. 2 Air Handling Units, 4 HVs and 1 MAU - Gym, Auditorium, Cafeteria, Kitchen and TV Studio
4. Local Exhaust System
A. Exhaust fans in misc. classrooms and bathrooms
Harrington Elementary School S.F. – 60,441 BUILT – 1968 # of Rooms – 33 Classrooms
1. Heat Generation Equipment
A. 3 AERCO Boilers – 2 Million BTU/Hr
2. Distribution System – Combination
A. Hydronic – Piping to UVs, Cabinet Heaters, FTRs
B. Forced Air – Gym and Cafeteria
3. Local Delivery Devices
A. Unit Ventilators (33) and FTRs –Classrooms and Offices
B. 4 Heat and Ventilation Units – Gym, Cafeteria and Kitchen
4. Local Exhaust System
A. Exhaust fans in misc. classrooms and bathrooms
Byam Elementary School S.F. – 60,441 BUILT – 1970 # of Rooms – 33 classrooms
1. Heat Generation Equipment
A. 3 AERCO Boilers – 2 Million BTU/Hr
2. Distribution System – Combination
A. Hydronic – Piping to UVs, Cabinet Heaters, FTRs
B. Forced Air – Gym and Cafeteria
3. Local Delivery Devices
A. Unit Ventilators (33) and FTRs –Classrooms and Offices
B. 4 Heat and Ventilation Units – Gym, Cafeteria and Kitchen
4. Local Exhaust System
A. Exhaust fans in misc. classrooms and bathrooms
Center Elementary School S.F. – 55,582 BUILT – 1960 # of Rooms – 31 Classrooms
1. Heat/Cooling Generation Equipment
A. 2 AERCO Boilers – 1.5 Million BTU/Hr
B. York Chiller – 170 Tons (2 Million BTU/Hr)
2. Distribution System – Combination
A. Hydronic – Piping to UVs, Cabinet Heaters, FTRs
B. Forced Air – Gym and Cafeteria
3. Local Delivery Devices
A. Unit Ventilators (45) – Classrooms and Offices
B. 4 AHU – Gym, Cafeteria and Kitchen, and Hallways
4. Local Exhaust System
A. Exhaust fans in misc. classrooms and bathrooms
South Row Elementary School S.F. – 44,580 BUILT – 1960 # of Rooms – 25 Classrooms
1. Heat Generation Equipment
A. 2 Smith Steam Boilers – 3.3 Million BTU/Hr
B. 2 Roof Top Units
2. Distribution System – Combination
A. Steam – Piping to UVs, Cabinet Heaters, FTRs
3. Local Delivery Devices
A. Unit Ventilators (35) – Classrooms, Gym and Cafeteria
B. Fin Tube Radiators - Offices
4. Local Exhaust System
A. Exhaust fans in misc. classrooms and bathrooms
Community Education/Westlands S.F. – 37,100 BUILT – 1970 # of Rooms – 25 classrooms
1. Heat Generation Equipment
A. 2 AERCO Boilers – 2 Million BTU/Hr
2. Distribution System – Combination
A. Hydronic – Piping to UVs, Cabinet Heaters, FTRs
B. Forced Air – Gym, Cafeteria, and Kitchen
3. Local Delivery Devices
A. Unit Ventilators (25) and FTRs – Classrooms
B. 1 Air Handling Unit - Offices
C. 6 Heat and Ventilation Units – Gym, Cafeteria and Kitchen
4. Local Exhaust System
A. Exhaust fans in misc. classrooms and bathrooms
Total at all Schools S.F. – 822,631 BUILT – 1957-74 411 Classrooms
1. Heat Generation Equipment
A. 25 AERCO Boilers
B. 30 Roof Top Units
C. 1 York Chiller
2. Distribution System – Combination A. Hydronic
B. Forced Air
3. Local Delivery Devices A. Unit Ventilators (390) and FTRs
B. 13 Air Handling Units
C. 18 Heat and Ventilation Units – Gym, Cafeteria and Kitchen
4. Local Exhaust System
A. Exhaust fans in misc. classrooms and bathrooms
ENERGY MANAGEMENT SYSTEM
ENERGY MANAGEMENT OVERVIEW
All sensors are wired to main panel in each building and each panel connects to the web based central server
Energy Management System Controls
A. Space Temperature
B. Unit Vent Discharge Temperature
C. Outside Air Temperature
D. Actuators
I. Water/Steam Valves
II. Air Dampers
Quickly; at a glance: view of room temperatures; alarms;
and communication status
Energy Management System – Typical Floor Plan
• Heating and Cooling Set Points
• Fan Status
• Face and Bypass & Outside Air Damper Positions
• Heating and Cooling Coils
Energy Management System – Large Spaces
• Outside Air Temperature
• Boiler HW Supply Temperature
• HW Valve Positions
• Classroom Space Temperature
• Uninvent Discharge Temperature
• Damper Positions
Energy Management System – Classroom Spaces
TYPICAL CLASROOM LAYOUT
Benefits of using Ducted Air for Distribution
Fresh air supply
Cleaned and Filtered
Creates air movement
Prevents stagnation
Prevents sick building syndrome
Space
Temperature
Measured Here
Outside
Air Intake
UV Discharge Air
Temperature
Measured Here
TREND Sensor and Communication System
Novar at McCarthy & South Row (Previously Installed)
3,692 Total Control Points
442 Space Temperatures monitored
CONTROLS OVERVIEW
STEP 1 - MONITOR
STEP 2 - REPORT
STEP 3 - INVESTIGATE
STEP 4 – DIAGNOSE & REPAIR
STEP 5 - CLOSE OUT
DAILY OPERATIONS
THE PROCESS
STEP 1: MONITOR
Energy Manager and
Facilities Manager
Monitor the EMS every
morning
STEP 2: PROBLEM IS
REPORTED
Teachers report
problem to Lead
Custodians
enter school dude
work order
STEP 3: INVESTIGATE
Energy Manager/Facilities
Manager/Director of
Facilities
assess issue and contact
appropriate service
contractor
STEP 4: DIAGNOSE
AND REPAIR
Appropriate contractor
diagnoses issue and
repairs if necessary
STEP 5: CLOSE OUT
Close work order
notify Lead Custodian
monitor to ensure issue
is resolved
SCHOOL DUDE WORK ORDERS
SchoolDude Work Order
Oct. 31st –Dec. 9th
35 Total Requests
17 Open (Work in Progress)
Cold Emails
Oct. 31st – Dec. 9th
135 Emails
70 Custodians and School Staff
65 CFT
SCHOOL DUDE WORKER ORDERS 10/31-11/4
SCHOOL DUDE WORKER ORDERS 11/7-11/11
SCHOOL DUDE WORKER ORDERS 11/14-11/18
SCHOOL DUDE WORKER ORDERS 11/21-11/25
SCHOOL DUDE WORKER ORDERS 11/28-12/2
SCHOOL DUDE WORKER ORDERS 12/5-12/9
RECENT HVAC PROBLEM - SOLUTION
Chelmsford High School – Café 2 reported cold
Report problem on Monday 12/5
Investigate temperatures on the EMS
Diagnosed & Serviced by HVAC Contractor, repaired
RTU – 21 and bled baseboard heat 12/6
Close Out work order on 12/7. Café 2 was
monitored and determine problem was solved
1. 12/5 Café was cold
2. 12/6 RTU and baseboard heat were resolved during the day
3. 12/7 Café operated normally
SchoolDude Example – CHS Café 2
RECENT HVAC PROBLEM - SOLUTION
Community Education – Nurse’s Office Reported Cold
Monitor Problem on 12/7 Energy Manager visted site – warm at that time, will monitor
Investigate12/8 still cold, submitted service request
Diagnosed & Serviced by HVAC Tech on 12/8 (informed it was a controls issue)
Diagnosed & Serviced by Controls Tech on 12/13 connected thermostat to baseboard heat and DPW Director adjusted exhaust vent
Close Out work order and continue to monitor
COMMUNICATIONS
Meetings with CFT Executive Board and CPS Building
Representatives
June 9th – CFT Executive Board, Bldg. Representatives
& Teachers @ Byam School
July 15th – CFT Executive Board, CAT Staff & Union
Representative @ Central Administrative Office
July 29th – CFT Executive Board, Bldg. Representatives
& Teachers @ DPW
November 21st – Bldg. representatives @ Parker
TBD– Harrington & Community Ed Building Reps
ENERGY SERVICE PERFORMANCE
AGREEMENT (ESPA) or (ESCO)
Contract Date - June 25, 2013
Final Completion Date - August 20,2015
The Town of Chelmsford
$8 Million Dollars Capital Investment in Schools
CONCLUSION
ESPA or ESCO not the problem
TOC upgraded capital in schools
TOC implemented Green Building Programs and DOER grants
The Perceived Problem is the distribution of cool air
The Solution
Raising low limit discharge air temperature (in process)
Alter univent operation of sequence (in process)
Honor & follow the process
Communicate & collaborate
QUESTIONS
Recommended