Title: Objectives
1Objectives
- Introduce HW5 Plumbing
- Learn about district cooling and heating systems
2(No Transcript)
3HW5 Find a system curve for this plumbing
configuration
40 ft
20 ft
20 ft
Due date April 30th
200 ft
5 ft
30 ft
30 ft
200 ft
40 ft
10 ton
30 ft
20 ft
10 ft
5 ft
5 ft
10 ft
10 ft
5 ft
30 ft
10 ft
5 ft
5 ft
10 ton
Final project Modeling
HW5 Design
4Hydronic 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
5Control of coil temperature
Mixing valve that control the flow through the
coil Flow Variation as a Function of Valve
Position
Same pressure drop like a cooling coil
Major pumping force is the chiller pump
6Multiple chiller (or boilers)
Serial
Parallel
7Primary-Loop Only VariableSpeed Flow
Single chiller
Multiple chillers
8Primary and Secondary Loop Variable Flow Design
Parallel chillers
Serial chillers
9Large Plant or Building Distribution Systems
Primary/Secondary Loops with Variable Flow and
Distributed Pumping
10Primary/Secondary and Tertiary Pumping
11Primary Pump Arrangements
Dedicate a pump for each chiller
Provide a common header for the pumps
12Coil Pumping Strategies
Variable speed pumps vs. Single pas Valve vs.
Mixing valves vs. Diverting Valves
13Impact of plumbing on acooling coil
14Plumbing Arrangement in Buildings hydronic
systems
Radiators
Fan coil systems
Baseboard heaters
15Valves
- Section 5-14 and 6-15 in the textbook
- Types
- Butterfly Valves
- Ball Valves
- Globe Valves
- Three way valves
16Valve Sizing and Flow Coefficient
Cv value
in liter/hour or.
in Pa
Control Valve Selection For Hydronic Systems
reference http//www.google.com/url?satrctjq
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17Control Valve Selection For Hydronic Systems
Before Digital Control we tried to do this
Valve authority
18Boilers
19Coal Boiler
20Coal burning method
Long time ago
Today 1) Fluidized bed http//www.youtube.com/
watch?v8n78CDI3GoU 2) Powdered
coal http//www.youtube.com/watch?vg1ojza-nbqs
21Coal-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)
22Oil Gas based boilers
Gas circulate through tubes water is
in-between
Water tube boiler
23Furnaces
For homes
Roof tops and induct heaters