hvac replacement project
HVAC REPLACEMENT PROJECT Board Meeting January 25, 2017
Pinellas Suncoast Transit Authority (PSTA) St. Petersburg, Florida
OVERVIEW MAIN CHILLER SYSTEM • PSTA’s Administration and Operations Buildings are cooled by two (2) 155 ton, air-cooled, helical rotary, liquid chillers. • The chillers, which were part of the original facility construction, are approximately 11 years old and have exceeded their useful life. • Due to age, the chillers have become prone to failure and costs to maintain/repair the existing chillers have increased each year.
1
OVERVIEW
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OVERVIEW HVAC CONTROLS SYSTEM • The existing controls system for the HVAC system is Facility Explorer by Johnson Controls. • A recent HVAC assessment has revealed that portions of the HVAC system are inoperable due to no connectivity to major components (i.e. air handlers, vents, thermostats, etc.). • This has resulted in being unable to control temperatures or airflow settings in many common areas and office spaces. • The net effect is an HVAC system which is inefficient and costly to operate.
3
OVERVIEW
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PROJECT SCOPE The “Turn-Key” design-build project entails all phases of the project including A&E, construction, installation, testing/balancing, etc. PHASE I--HVAC SYSTEM DESIGN • The design team will perform the following: 1) Required site surveys; 2) Thermal heat load calculations; 3) Evaluate existing equipment capacities; 4) Evaluate existing control systems; 5) Evaluate and specify proper size chiller systems; 6) Submit 30/60/90/100 percent drawings to PSTA for approval.
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PROJECT SCOPE PHASE II—CONSTRUCTION PROCESS MAIN CHILLER SYSTEM • Contractor will remove the existing chillers and associated equipment. • Replace the existing chillers and water pumps while always insuring the HVAC system remains online during construction. • New chillers will be designed with variable speed compressors and condenser fans which translates to higher energy efficiency.
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PROJECT SCOPE PHASE II—CONSTRUCTION PROCESS HVAC DIRECT DIGITAL CONTROL SYSTEM • Provide a new backbone control system with software that allows scheduling and monitoring of the HVAC system. • Controls system will be tied into all of the variable air volume boxes (VAV), air handling units (AHU), temperature sensors, pressure sensors, etc. • Chillers will be configured in parallel operation which will reduce the overall pumping pressure and save energy. • Recirculate the existing air inside the facility and limit amount of external air being brought in. • This will maintain adequate ventilation, building pressure, and consistent temperatures.
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PROJECT SCOPE
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PROJECT SCOPE PHASE III—PROJECT COMPLETION
• Test and balance the entire system for each area of the campus to ensure system is working effectively and efficiently. • Train PSTA Facilities Maintenance Staff on proper operation of the equipment and controls system.
9
PROJECT OUTCOME • Installation of two (2) new chillers and the proper controls system will create comfortable environments for PSTA staff and visitors. • New equipment will greatly reduce the operating cost of ongoing maintenance and repairs of the campus HVAC system. • New equipment will also yield significant annual energy savings of approximately $64,000.
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PROJECT OUTCOME COST SAVINGS
DESCRIPTION
ESTIMATED SAVINGS
Chiller Efficiency
New variable speed, energy efficient chillers
$20,000
Direct Digital Control Systems
New control system with responsive components and accurate sensors.
$20,000
Pumping System
Change water pumping system to variable flow.
$8,500
Demand Control Ventilation
Install CO2 Sensors to reduce ventilation load.
$7,500
OA Ventilation System
Reduce outside ventilation air conditioning load.
$7,500
Pump Horsepower Reduction
Modifying the series piping arrangement at the chillers to a parallel flow.
$1,000
11
PROJECT TIMELINE • PSTA Purchasing Department has issued and received proposals from interested and capable contractors to perform the work. • Negotiations with the proposers are currently in process. • Follow-up presentation and staff recommendation to be given at the February 2017 Finance Committee Meeting. • Work tentatively planned to begin March 2017 pending approval of award. • Project to be finished by September 2017.
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PROJECT FISCAL IMPACT • The budget for this project is $1.25 million. • Project will be 100% federally funded by a Federal Transit Administration (FTA) grant and is included in the approved Capital Improvement Program (CIP).
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QUESTIONS?
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Pinellas Suncoast Transit Authority (PSTA) St. Petersburg, Florida
OVERVIEW MAIN CHILLER SYSTEM • PSTA’s Administration and Operations Buildings are cooled by two (2) 155 ton, air-cooled, helical rotary, liquid chillers. • The chillers, which were part of the original facility construction, are approximately 11 years old and have exceeded their useful life. • Due to age, the chillers have become prone to failure and costs to maintain/repair the existing chillers have increased each year.
1
OVERVIEW
2
OVERVIEW HVAC CONTROLS SYSTEM • The existing controls system for the HVAC system is Facility Explorer by Johnson Controls. • A recent HVAC assessment has revealed that portions of the HVAC system are inoperable due to no connectivity to major components (i.e. air handlers, vents, thermostats, etc.). • This has resulted in being unable to control temperatures or airflow settings in many common areas and office spaces. • The net effect is an HVAC system which is inefficient and costly to operate.
3
OVERVIEW
4
PROJECT SCOPE The “Turn-Key” design-build project entails all phases of the project including A&E, construction, installation, testing/balancing, etc. PHASE I--HVAC SYSTEM DESIGN • The design team will perform the following: 1) Required site surveys; 2) Thermal heat load calculations; 3) Evaluate existing equipment capacities; 4) Evaluate existing control systems; 5) Evaluate and specify proper size chiller systems; 6) Submit 30/60/90/100 percent drawings to PSTA for approval.
5
PROJECT SCOPE PHASE II—CONSTRUCTION PROCESS MAIN CHILLER SYSTEM • Contractor will remove the existing chillers and associated equipment. • Replace the existing chillers and water pumps while always insuring the HVAC system remains online during construction. • New chillers will be designed with variable speed compressors and condenser fans which translates to higher energy efficiency.
6
PROJECT SCOPE PHASE II—CONSTRUCTION PROCESS HVAC DIRECT DIGITAL CONTROL SYSTEM • Provide a new backbone control system with software that allows scheduling and monitoring of the HVAC system. • Controls system will be tied into all of the variable air volume boxes (VAV), air handling units (AHU), temperature sensors, pressure sensors, etc. • Chillers will be configured in parallel operation which will reduce the overall pumping pressure and save energy. • Recirculate the existing air inside the facility and limit amount of external air being brought in. • This will maintain adequate ventilation, building pressure, and consistent temperatures.
7
PROJECT SCOPE
8
PROJECT SCOPE PHASE III—PROJECT COMPLETION
• Test and balance the entire system for each area of the campus to ensure system is working effectively and efficiently. • Train PSTA Facilities Maintenance Staff on proper operation of the equipment and controls system.
9
PROJECT OUTCOME • Installation of two (2) new chillers and the proper controls system will create comfortable environments for PSTA staff and visitors. • New equipment will greatly reduce the operating cost of ongoing maintenance and repairs of the campus HVAC system. • New equipment will also yield significant annual energy savings of approximately $64,000.
10
PROJECT OUTCOME COST SAVINGS
DESCRIPTION
ESTIMATED SAVINGS
Chiller Efficiency
New variable speed, energy efficient chillers
$20,000
Direct Digital Control Systems
New control system with responsive components and accurate sensors.
$20,000
Pumping System
Change water pumping system to variable flow.
$8,500
Demand Control Ventilation
Install CO2 Sensors to reduce ventilation load.
$7,500
OA Ventilation System
Reduce outside ventilation air conditioning load.
$7,500
Pump Horsepower Reduction
Modifying the series piping arrangement at the chillers to a parallel flow.
$1,000
11
PROJECT TIMELINE • PSTA Purchasing Department has issued and received proposals from interested and capable contractors to perform the work. • Negotiations with the proposers are currently in process. • Follow-up presentation and staff recommendation to be given at the February 2017 Finance Committee Meeting. • Work tentatively planned to begin March 2017 pending approval of award. • Project to be finished by September 2017.
12
PROJECT FISCAL IMPACT • The budget for this project is $1.25 million. • Project will be 100% federally funded by a Federal Transit Administration (FTA) grant and is included in the approved Capital Improvement Program (CIP).
13
QUESTIONS?
14
