how to achieve high chilled water delta temp. for 5th dc summit-2013 in qatar-by getco
TRANSCRIPT
Achieving High Chilled-Water Delta Ts
Chillers Plant-Main Components
LoadAHUFCU
FAHU
CoolingTower
Chilled Water Pump
Quizzes as introduction
4.5’C40’F
13’C56’F
What is High Delta Temp.?
Delta T: 3’F (1.5’C)
CH. Inefficient Operation
If Chiller Maximum Cap. is 600 TR: It can COOL 1000 gpm of CH.W.
Delta T: 16’F (9’C)
CH. Optimum Operation
13.5’C
56’F
4.5’C
40’F
6’C
43’F
4.5’C
40’F
The Challenges-
What will happen to CH. W. Sys. Components when Delta Temp. Differ (Keep Changing)?
Chillers
Pumps
Cooling
Energy Meters
Occupants Satisfaction
Towers
Enviro. Effect
Can same-GPM transfer more Cooling if Delta Temp. Increases?
gpm Delta-T TR
1000 1 42
1000 2 83
1000 3 125
1000 4 167
1000 5 208
1000 6 250
1000 7 292
1000 8 333
1000 9 375
1000 10 417
1000 11 458
1000 12 500
1000 13 542
1000 14 583
1000 15 625
1000 16 667
1000gpm/Pump
-1-Chiller & 1-Pump is Working to Deliver 600 TR @ Delta Temp.: 15’F
600- TR/Chiller
5.5’C
42’F
4.5’C
40’F
14.5’C
58’F
13.5’C
56’F
When Delta Temp. is fixed, how many TR can be transfer when flow change?
gpm Delta-T TR
500 4 83.3600 4 100700 4 117800 4 133900 4 150
1000 4 1671400 4 2331100 4 1831200 4 2001500 4 2501800 4 3002000 4 3332500 4 4173000 4 500
4000 4 667
-5-Chillers & 5-Pumps are Working to Deliver 600 TR @ Delta Temp.: 4’F
4000-gpm
Pump
600- TR/Chiller
12.2 ’C54’F
4.5 ’C40’F
14.5 ’C
58’F
6.7 ’C
44’F
3’F
6’F
9’F
12’F
16’F
If we have a Building Load 600 TR: How many Chiller we will Work?
5000gpm
4000gpm
3000gpm
2000gpm
1000gpm
Inefficient Operation
If we have a Building Load 600 TR: How many Chiller we will Work?
Optimum Operation
13’C
56’F
4.5’C
40’F
6.7’C
44’F
4.5’C
40’F
What will happen to Power Consumption Ratio when Delta T decreases? (Low T. Syndrome)
Chillers
Pumps
Cooling
Energy Meters
Occupants Satisfaction
Towers
Enviro. Effect (-)
What will happen to Power Consumption Ratio when Delta T increases? (High T. Syndrome)
Chillers
Pumps
Cooling
Energy Meters
Occupants Satisfaction
Towers
Enviro. Effect
What will happen to Power Consumption Ratio when the need for CH. W. Flow decrease?
Chillers
Pumps
Cooling
Energy Meters
Occupants Satisfaction
Towers
Results-Once high
chilled-water Delta Ts is achieved, more Btu’s (J/s) of cooling will be accomplished per gallon (liter) of chilled-water distributed.
J/S)
gpm Delta-T TR
1000 1 41.71000 2 83.31000 3 125.01000 4 166.71000 5 208.31000 6 250.01000 7 291.71000 8 333.31000 9 375.01000 10 416.71000 11 458.31000 12 500.01000 13 541.71000 14 583.3
1000 15 625.0
Results-
hydronic
hydronic
Pressure losses and pumping energy will declineconsiderably in existing hydronic cooling systems and smaller pumps and piping may be installed in new hydroniccooling systems.
One Working Pump Compare to 5-Pumps
Results-Also, water chiller
capacities will no longer be limited by maximum cooler flow rates chilled-water storage tanks will store many more ton/hours (MJ) of cooling.
MJ
Results-This
fundamental approach provides significant, enduring improvements in the performance of variable-flow hydroniccooling systems.
hydronic
Results-Maximize the
cooling efficiency of Cooling Coil and prevent over flooding of CH. Water & increase Delta-T
Results-Anther
important benefit is the cooling transferred from Primary Circuit to Secondary Circuit 1’C+/-1’C
Results-The efficient
cooling & pumping means less Working:
• Chillers.
• C. Towers.
• Pumps.
• Dhs Per TR.
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The Challenge: How to achieve & maintain High Delta-T?
Estimate of Situation: The Need for Balancing and/or re-balancing of CH. W. Flow System.
ASHRAE
Basic: Since “ASHRAE” approved 5 Methods of Chilled Water Piping
1- No Balancing Method
2- Manual Balance
Using DRV Method
3- Automatic Flow Limiting
Valves
4- Reverse Return
Method
5- Oversized Main Piping
Method
ASHRAE-
Basic of “ASHRAE”: No Balancing required except Manual Balance Method using DRV.
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We like to take you today in a small journey to test possible solutions step-by-step.
Agenda:• Identify Possible Reasons for
Low Delta-T and quantify effect of peak heating load?
• Design an automatic control system that will higher Delta-T
• Fix the control system and commission, also keep monitoring the performance.
• Ensure system capacity to treat dehumidification preciously while trying to control high DT .
• Balance the comfort with efficiency and energy saving.
• Suggest New Specifications with connected Load.
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How DC-Provider Can Achieve High Delta?
When CH.W. Pumps are located below loads, How can u transfer Cooling?
The 5th Annual Middle East District Cooling Summit – 2013 @ Qatar
WORKSHOP Partners
Our Solution has revealed at:
How to Call us ? To benefit from our
Services:• Consultancies.• Corrections.
Call:
Dr. Taoufik A. HadiEng. Juma Yousef
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Mobile: [email protected]