sureflow: a paradigm shift in fan coil systems€¦ · 3.sureflow: a paradigm shift –patrick...
TRANSCRIPT
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SureFlow: A Paradigm Shift in Fan Coil SystemsUniversity of North Carolina at Greensboro – Edward Keller
Thermal Resource Sales, Inc. – Patrick McNamara, PE
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Presenters:
Ed Keller – UNCG, Associate Director for Operations for Housing and Residence Life
Patrick McNamara, PE – TRS‐Greensboro Manager, SESCO Engineering, P.C. – President
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A little bit about Ed…
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A little bit about Patrick…
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Who is TRS/SESCO?• Founded in 1996 as McNamara & Co.• Separately incorporated as TRS & SESCO in 1998.• Today we are approximately 90 total employees
with 40 outside sales engineers across 3 states. • TRS represents 70+ manufacturers across the
Carolina’s and Georgia focusing on custom engineered, energy efficient MEP equipment.
• TRS has a full service division supporting equipment installations, start‐up, commissioning, and warranty.
• SESCO business model includes engineering services, equipment procurement, and commissioning services.
• SESCO has completed 2,500+ supermarket projects stretching from Maine to Florida.
5
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1. Introduction – Ed Keller, UNCG2. Fan Coil 101 – Patrick McNamara, TRS/SESCO3. SureFlow: A Paradigm Shift – Patrick McNamara, TRS/SESCO4. Rubber Meets The Road: Grogan and Cone Hall – Ed Keller, UNCG5. From The Owners Perspective – Ed Keller, UNCG6. Conclusion – Ed Keller & Patrick McNamara
OUTLINE
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Fan + Coil = Fan Coil
Room Fan‐Coil Performance RatingListed Per ANSI/AHRI Standard 440
What Is A Fan Coil ?
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Condensate Drain Pan
Thermostat
Air Filter
Return Air From Room
Return Water
Standard Coil Operation
Supply Water
Supply Air To Room
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6-14 Fins Per Inch
1-12 Rows
Hot or Cold Water
Face Area ≈ 1 Sq Ft Per Ton
Tube Water Velocity2 < 7 Ft Per Second
Air Velocity Max≈ 450 Ft Per Minute
WPD, APD, & BTU’s
Always use Stainless Steel Casings on Chilled Water Coils
Coil Designs
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10
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CHILLERCHILLERFAN COIL
HEAT REJECTED OUTSIDE –WATER IS CHILLED
PUMP
PIPINGSYSTEM
HEAT REMOVED FROM ROOM AIR
42-47° FWater
Cooling Operation
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BOILERBOILERFAN COILHEAT DELIVERED
TO ROOM AIR
PUMP
PIPINGSYSTEM
WATER IS HEATED WITH
ENERGY (NATURAL GAS, ELECTRICITY,
PROPANE, STEAM)
130-180° FWater
Heating Operation
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FCU
ChillerChiller
FCUFCUFCU
Central Pump Drives Water Through Piping to Supply Each Fan Coil
Direct Return
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ChillerChillerFCU FCU FCU FCU
Supply
Return
Express Return
Reverse Return
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FCU
ChillerChiller
FCUFCUFCU
BoilerBoiler
What do I do if I want heat?Complain!
Boiler is OFF
2‐Pipe Heat / Cool Changeover = All Units Are Either Cooling or Heating
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FCU
ChillerChiller
FCUFCUFCU
BoilerBoiler
What do I do if I want cool?Complain!
Chiller is OFF
2‐Pipe Heat / Cool Changeover = All Units Are Either Cooling or Heating
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ChillerChiller BoilerBoiler
FCUFCUFCUFCU
4-Pipe Heat / Cool =Units May Cool or Heat Any Time
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ChillerChiller BoilerBoiler
FCU
Supply
Return
4-Pipe Heat / CoolHow Is It Controlled ?
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Determined from several parameters:• Coil Length• Coil Rows• Tube Circuits• GPM Flow Rate• Water Temperature
Example@ 3.0 GPMCoil PdFt = 5.9
Coil Pressure Drop
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FCU
ChillerChiller
FCUFCUFCU
Ball Valves For Service / Isolation
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ChillerChiller
FCUFCUFCUFCU
Add Control Valves and Thermostats ForIndividual Comfort Control
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PdFt = (GPM / (0.658 x Cv ))^2
Cv = 2.5 (1/2 inch VT2212)GPM = 3PdFt = (3 / (0.658 x 2.5))^2
PdFt = 3.3
VT22122.5 Cv (5/16” Port)Close‐off = 40 PSI
Control Valve Pressure Drop
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FCU
@ GPM = 3.0
Ball Valve PdFt = 0.1’
Coil PdFt = 5.9’
Control Valve PdFt = 3.3’
Ball Valve PdFt = 0.1’
Total PdFt = 9.4’
÷ 2.33
= 4.0 PSI Diff
Analyze Combined Unit And Valve Package Pressure Drop
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Will These Fan Coils Operate As Advertised ?
ChillerChiller
FCU FCUFCUFCU
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ChillerChiller
OFF ONONOFF
Water Flow Balance Is A Problem
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ChillerChillerFCUFCUFCUFCU
Add Circuit Setters For Manual Balancing
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• Manually Adjustable • Fixed CV Orifice – Pressure Drop Measurement• 1/2 Inch CV Rating 2.12 @ Full Open• 3/4 Inch CV Rating 3.90 @ Full Open
• Does Not Adjust to System Pressure Changes• If Pressure Changes – Flow Will Also Change
Manual Circuit Setter
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ChillerChillerFCUFCUFCUFCU
Add Cartridge Valves For Automatic Balancing
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• Self-Adjusts to System Pressure Changes• Accurate Flow Setting• Range 2 – 80 PSI Differential• Easy Change Cartridge To Change Flow Rate• Extremely Quiet
Automatic Flow Control
Flow Direction
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ChillerChiller
FCUFCUFCUFCU
Add Strainers
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FCU
ChillerChiller
FCUFCUFCU
3-Way Valve
Primary – Secondary Pumping
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FCU
ChillerChiller
FCUFCUFCU
Primary – Secondary Pumping
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Valve Package Complexity – vs – Value ?
There Must Be A Better Way
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System Design Issues
Chiller / Boiler Equipment Plant Pumps Create Water Pressure Differential Pipes Running To and From Each Unit Valves – On/Off or Modulating Balancing Requires Flow Regulators or Circuit Setters Pressure Relief Valves on Mains Variable Speed Drives on Pumps Controls, DDC, Building Energy Management System Installation Labor: 2/Pipe – vs. – 4/Pipe Direct Return – vs. – Reverse Return Test & Balance is Recommended
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The Better Way!
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“Each piping system is a network;
the more extensive the network, the more complex it is to understand,
analyze, or control.
Thus, a major design objective is to maximizesimplicity.”
2012 ASHRAE HandbookHVAC Systems and Equipment
Chapter 13.11Piping Circuits
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ASHRAE Handbook 1996‐2008, Chapter 12
ASHRAE Handbook 2012, Chapter 13
ASHRAE HandbookHVAC Systems and Equipment
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2012 ASHRAE HandbookHVAC Systems and Equipment
Chapter 13
One-pipe diverting series circuits –“when coupled with compound pumping systems, series circuits can be applied to
multiple control zones on larger commercial or institutional systems.”
Design Considerations: Piping Circuits -Diverting Series
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Primary Circuit Water Flow
Integrated CirculatorCycles on Thermostat Demand
2012 ASHRAE HandbookHVAC Systems and Equipment
Chapter 13
SureFlow by IEC
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Multiple Units Share One Pipe
Central Pump Is NOT Responsible For Pressure Drop Of Coil Or Valve Packages
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Multiple Loops
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Chiller
FANCOIL
FANCOIL
FANCOIL
FANCOIL
Boiler
Two Pipe PerformanceWith Only One Installed Pipe
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Chiller
FANCOIL
Boiler
FANCOIL
FANCOIL
FANCOIL
Four Pipe PerformanceWith Only Two Installed Pipes
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42ºF 43.8ºF43.9ºF 45.1ºF
42.9ºF
Chiller
Off
52.1ºF
1 Ton13177 t 9954 s
1 Ton
12052 t 9519 s
1 Ton
14424 t 10448 s
1 Ton
SureFlow System Performance
Central Pump Horsepower = __Head x GPM__3960 x Efficiency
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Primary Pump
Common Load
Secondary Pump
Chiller‐ Or ‐Heat
Exchanger
Compound Primary‐Secondary
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Loop 1
Chiller
Loop 2
Trunk Main
Service Valves
Balance Valves
Parallel Loops
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CHWR
CHWS
Multiple Floors
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Building 1 of X Building 2 of X
Central PlantLEED-NC Credit EAc4
Enhanced Refrigerant Management
Campus Chilled Water
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SureFlow Water Calculation
Coil Pressure Drop is Redesigned to Match
Circulator Pump Curve
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•Single Pipe Chilled Water•Single Pipe Hot Water•2-Pipes for 4-Pipe System•Wet Rotor Circulators•Rating Software
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30 Years In Production
Millions In Use
Quiet Operation
Chilled Water CERTIFIED
Non‐Magnetic Impeller
Wet Rotor Cartridge Design
Internal Flow Check Valve
200 PSI Rating
No More Energy Than A Light Bulb
65Watts
SureFlow Circulator – 1/40 HP
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SureFlow System Design Software
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Rapidly Move Concept to PaperEstimatingBudgetSpeed of Design
Changes Are Made EasilyFlexible DesignFuture Changes Easily AdoptedDue Diligence is Covered
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Benefits of SureFlow (Series Decoupled Hydronic Fan Coil Design (ASHRAE))
• Up to 40% reduction in installed pipe length and labor.• Maintenance time and cost is GREATLY reduced.• Pumping horsepower is reduced. Circulators Responsible for coil pressure drop.• Simple and stable on‐off pump operation. Complex modulating controls not required.• No proprietary components. Readily sourced parts.• Refrigerant is contained at the central plant, not distributed throughout the building.
(LEED Refrigerant Management Credit)• Contractor jobsite coordination is simplified and balancing at the fan coil is eliminated.
Construction Cost Is Lowered. Maintenance Is Reduced. Energy Efficiency Is Enhanced.
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A Case Study:
University of North Carolina at Greensboro
Grogan & Cone Hall
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Grogan Hall Stats:
‐ 75,000 Square Feet‐ Constructed in mid‐1960’s‐ Freshman Hall‐ Living and Learning Community‐ 165 Rooms‐ 336 Students‐ Existing 2‐pipe system‐ $2,300,000 Mechanical Renovation Budget (Based on 4‐pipe design)‐ $1,800,000 Mechanical Installed Cost‐ ~22% First Cost Savings‐ ~30% Reduction in Energy (Utilizing Occupancy Based T’Stats)
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Example Riser Diagram
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Example Riser Diagram
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Vertical Hallway SureFlow Units
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Grogan Hall Case Study
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University of North Carolina at Greensboro – Cone Hall
‐ Mirror of Grogan plus one additional floor‐ One major difference was that the space between block walls when entering the student room was too small to fit a standard SureFlow Fan Coil Unit.
‐ Solution: Design a custom SureFlow Fan Coil Unit to fit!
‐ First Cost savings were enough to offset the increased cost of custom SureFlow Fan Coil Units.
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SureFlowbyIEC
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University of North Carolina at Greensboro – Cone Hall
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University of North Carolina at Greensboro – Cone Hall
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University of North Carolina at Greensboro – Cone Hall
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University of North Carolina at Greensboro – Cone Hall
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University of North Carolina at Greensboro – Cone Hall
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Added Support For Circulators
Extended Drain Pan
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4‐Pipe Valve Package32+ solder joints
SureFlow package16 solder joints
Side by Side Comparison: SureFlow Maintenance Benefits Become Obvious
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