objectives -introduce hw5 – plumbing -learn about district cooling and heating systems
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Objectives
- Introduce HW5 – Plumbing
- Learn about district cooling and heating systems
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HW5: Find a system curve for this plumbing configuration
200 ft
200 ft
30 ft30 ft
20 ft20 ft40 ft
40 ft
30 ft
30 ft
10 ft 10 ft
10 ft
10 ft20 ft
5 ft
5 ft
5 ft5 ft
5 ft
5 ft
10 ton
10 ton
Final project – Modeling HW5 – Design
Due date: April 30th
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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 Digital Control we tried to do this
Valve authority
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Boilers
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Coal Boiler
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Coal burning method
Long time ago:
Today:
1) Fluidized bed: http://www.youtube.com/watch?v=8n78CDI3GoU
2) Powdered coal:http://www.youtube.com/watch?v=g1ojza-nbqs
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Coal-fired power plant filters
• For Particulate Maters• Electrostatic precipitator
• Filter bags
• Scrubber for SO2 (to prevent formation of Sulfuric acid – H2SO4)• Grinded Limestone in water (slurry) sprayed into the gas fluid
stream SO2 + Limestone slurry → Gypsum (used for wallboard)
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Oil – Gas based boilers
Gas circulate through tubes water is in-between
Water tube boiler
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Furnaces
For homes
Roof tops and induct heaters