objectives - finish with pumps and plumbing example - learn about district cooling and heating...
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Objectives
- Finish with pumps and plumbing example
- Learn about district cooling and heating systems
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System Curves
A B∆p
V
A+B
ParallelA B
A B
∆p
V
A+B
A
B
Serial
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System balancing
BOILER
HC2
AHU1 AHU2
HC1
pump
100 ft 1000 ft
2 gpm 10 gpm
10 ft
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Pumps• Raise pressure and produce flow
• Main type• Centrifugal
Inline Base mounted
Example of Turbine pump
Reading (textbook)Page 3-36 - 3-45
http://www.taylor-engineering.com/downloads/cooltools/EDR_DesignGuidelines_CoolToolsChilledWater.pdf
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Curve for Multiple Pumps
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Changing Pump Speed
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HW5: Find a system curve for this plumbing configuration
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Primary/Secondary and Tertiary Pumping
Taylor, S., P. Dupont, B. Jones, T. Hartman and M. Hydeman. 2000. Chilled water plant design guide. San Francisco: Pacific Gas & Electric Company.
http://www.taylor-engineering.com/downloads/cooltools/EDR_DesignGuidelines_CoolToolsChilledWater.pdf
Reading Assignment:
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Hydronic systems for district cooling/heating and buildings
Constant-Flow System, Single Chiller, Single Coil Constant-Flow System, Single Chiller, Multiple Coils
Mixing valve that control by-pass flow Major pumping force is the chiller pump
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Control of coil temperature Mixing valve that control the flow through the coil Flow Variation as a Function of Valve Position
Major pumping force is the chiller pump
Same pressure drop like a cooling coil
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Multiple chiller (or boilers) Parallel Serial
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Primary-Loop Only VariableSpeed Flow
Single chiller Multiple chillers
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Primary and Secondary Loop Variable Flow Design
Parallel chillers
Serial chillers
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Large Plant or Building Distribution Systems
Primary/Secondary Loops with Variable Flow and Distributed Pumping
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Primary/Secondary and Tertiary Pumping
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Primary Pump ArrangementsDedicate a pump for each chiller
Provide a common header for the pumps
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Coil Pumping Strategies
Variable speed pumps vs. Single pas Valve vs. Mixing valves vs. Diverting Valves
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Impact of plumbing on acooling coil
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Plumbing Arrangement in Building’s hydronic systems
Fan coil systems Baseboard heaters
Radiators
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Valves• Section 5-14 and 6-15 in the textbook
• Types• Butterfly Valves
• Ball Valves
• Globe Valves
Three way valves
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Valve Sizing and Flow Coefficient
Cv value:
in liter/hour or….
in Pa
Control Valve Selection For Hydronic Systems reference:http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CCUQFjAA&url=http%3A%2F%2Fbookstore.ashrae.biz%2Fjournal%2Fdownload.php%3Ffile%3Dhegberg.pdf&ei=IvcqU_O1KMuE2AWgloHgDA&usg=AFQjCNFRAMzPnbzDpAluhyk4l8u_SKKTdw
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Control Valve Selection For Hydronic Systems
Before DC we tried to do this
Valve authority