CHELMSFORD PUBLIC SCHOOLS

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


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


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



B. 1 Roof Top Unit + 4 Electric RTUs (Pods)



B. Forced Air – Gyms, Auditorium and Library


A. Unit Ventilators (87) and FTRs – Classrooms and Offices

B. 4 Air Handling Units – Gym, Auditorium, and Library (with Reheat Coils)



Parker Middle School S.F. – 121,873 BUILT –1965 # of Rooms – 69 Classrooms



B. 1 Roof Top Unit, 12 Electric RTUs (Pods)



B. Forced Air – Gyms, Cafeteria, Pods and Library


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



Harrington Elementary School S.F. – 60,441 BUILT – 1968 # of Rooms – 33 Classrooms





B. Forced Air – Gym and Cafeteria



B. 4 Heat and Ventilation Units – Gym, Cafeteria and Kitchen



Byam Elementary School S.F. – 60,441 BUILT – 1970 # of Rooms – 33 classrooms








B. 4 Heat and Ventilation Units – Gym, Cafeteria and Kitchen



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)





A. Unit Ventilators (45) – Classrooms and Offices

B. 4 AHU – Gym, Cafeteria and Kitchen, and Hallways



South Row Elementary School S.F. – 44,580 BUILT – 1960 # of Rooms – 25 Classrooms


A. 2 Smith Steam Boilers – 3.3 Million BTU/Hr

B. 2 Roof Top Units


A. Steam – Piping to UVs, Cabinet Heaters, FTRs


A. Unit Ventilators (35) – Classrooms, Gym and Cafeteria

B. Fin Tube Radiators - Offices



Community Education/Westlands S.F. – 37,100 BUILT – 1970 # of Rooms – 25 classrooms





B. Forced Air – Gym, Cafeteria, and Kitchen


A. Unit Ventilators (25) and FTRs – Classrooms

B. 1 Air Handling Unit - Offices

C. 6 Heat and Ventilation Units – Gym, Cafeteria and Kitchen



Total at all Schools S.F. – 822,631 BUILT – 1957-74 411 Classrooms


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



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






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

Documents

CHELMSFORD PUBLIC SCHOOLS