Difference between revisions of "DCOM Volume I Appendix C"

From Ministry of Water DCOM Manual
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= Appendix C: Example: Estimating the Capacity of a Storage Tank =
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= APPENDIX C: EXAMPLE ON ESTIMATING THE CAPACITY OF A STORAGE TANK =
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Estimate the minimum storage tank capacity for a solar powered system assuming 40L/Min for 6.5 hours per day, a daily water demand of 15,000L and the, morning evening peak pattern from shown on table below:
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Estimate the minimum storage tank capacity for a solar powered system assuming
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40L/Min for 6.5 hours per day, a daily water demand of 15,000L and the, morning
 +
evening peak pattern from shown on table below:
  
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Table C.1:Common Daily Percentage Consumption Patterns
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[[Image:AppendixcTableC.1.PNG|993px|link=DCOM_Volume_I]]
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{| class="wikitable"
 
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|-
 
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! Time Period !! Morning /Evening Peak* !! Mid-day Peak* !! Water Mission
 
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|-
 
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| 5.00 || 0% || 5% || 5%
 
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|-
 
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| 6.00 || 15% || 5% ||5%
 
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|-
 
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| 7.00|| 15% || 10% || 10%
 
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|-
 
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| 8.00 || 5% || 5% || 10%
 
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|-
 
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| 9.00 || 5% || 5% || 5%
 
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|-
 
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| 10.00 || 5% || 5% || 10%
 
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|-
 
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| 11.00 || 5% || 20% || 5%
 
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|-
 
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| 12.00 || 5% || 15% || 5%
 
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|-
 
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| 13.00 || 5% || 5% || 5%
 
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|-
 
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| 14.00 || 5% || 5% || 5%
 
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|-
 
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| 15.00 || 5% || 5% || 10%
 
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|-
 
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| 16.00|| 15% || 5% || 10%
 
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|-
 
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| 17.00 || 15% || 5% || 5%
 
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|-
 
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| 18.00 || 0% || 5% || 5%
 
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|}Data from A /Hand book of Gravity Flow Water systems (Jordan)
 
  
 
'''Step 1: Determine the daily water demand pattern'''<br>
 
'''Step 1: Determine the daily water demand pattern'''<br>
 +
The first step is to determine how much water will be used at different times
 +
during the day in a specific community. This can be accomplished by observing
 +
the community water collection habits. Water Demand for each time period can
 +
be calculated based on percentages obtained in the community water collecting
 +
habits. The balance is determined by subtracting the demand from the supply
 +
and adding it to the current surplus/deficiency balance.
  
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The first step is to determine how much water will be used at different time during the day in the specific community. This can be accomplished by observing the community water collection habits. Water Demand for each time period can be calculated based of percentages obtained in the community water collecting habits. The balance is determined by subtracting the demand from the supply and adding it to the current surplus/deficiency balance.
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[[Image:AppendixcTableC.2.PNG|993px|link=DCOM_Volume_I]]
  
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Table C.2: Determining Supply Deficiencies
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'''Step 2: Determine the minimum tank capacity'''<br>
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{| class="wikitable"
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To ensure sufficient water to a community, there must be enough water to last
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|-
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until the trough of the next day. This calculation is represented as;<br>
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! Timeperiod !! Percentage of Daily Use!! Supply(litres)!! Demand(Litres)!! Surplus/Deficiency(Litres!! Balance (Litres)
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V<sub>tank</sub> = V<sub>max</sub> – V<sub>min</sub> – V<sub>final</sub> <br>
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V<sub>tank</sub> = 4,500L – (–5,400L) – 600L = 9,300L <br>
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|5.00 || 0% || 0 || 0 || 0 || 0
 
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|-
 
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| 6.00|| 15% || 0 || 2250 || -2250 || -2250
 
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|-
 
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| 7.00 || 15% || 0 || 2250 || -2250 || -4500
 
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| 8.00 || 5% || 0 || 750|| -750 ||-5250
 
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| 9.00 || 5% || 600 || 750 || -150 || -5400
 
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| 10.00 || 5% || 2400 || 750 || 1650 || -3750
 
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| 11.00 || 5% || 2400 || 750 || 1650 || -2100
 
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| 12.00 || 5% || 2400 || 750 || 1650 || -450
 
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| 13.00 || 5% || 2400 || 750 || 1650 || 1200
 
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| 14.00 || 5% || 2400 || 750 || 1650 ||2850
 
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| 15.00 || 5% || 2400 || 750 || 1650 || 4500
 
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|-
 
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| 16.00 || 15% || 600 || 2250 || -1650 || 2850
 
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|-
 
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| 17.00 || 15% || 0 || 2250 || -2250 || 600
 
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|-
 
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| 18.00 || 0% || 0 || 0 || 0 || 600
 
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|}
 
  
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'''Step 2: Determine the minimum tank capacity'''
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The water storage tanks should be able to hold at least 9,300 L to suffice the need
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To ensure sufficient water to community, there must enough water to last until the trough of the next day. This calculation is represented as;
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of the community. The designer should use 10,000 L storage tanks or use two
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5,000 L storage tanks in sizing of the needed capacity.
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V<sub>tank</sub> = V<sub>max</sub> - V<sub>min</sub> - V<sub>final</sub>
 
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V<sub>tank</sub> = 4500L - (-5400L) -600L = 9300L
 
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The water storage tank should be able to hold at least 9300L to suffice the need of the community. The designer should use 10,000L storage tank or use two 5000L storage tank in sizing of the Capacity of Tank.
 

Revision as of 13:31, 30 May 2021

APPENDIX C: EXAMPLE ON ESTIMATING THE CAPACITY OF A STORAGE TANK

Estimate the minimum storage tank capacity for a solar powered system assuming 40L/Min for 6.5 hours per day, a daily water demand of 15,000L and the, morning evening peak pattern from shown on table below:

AppendixcTableC.1.PNG

Step 1: Determine the daily water demand pattern
The first step is to determine how much water will be used at different times during the day in a specific community. This can be accomplished by observing the community water collection habits. Water Demand for each time period can be calculated based on percentages obtained in the community water collecting habits. The balance is determined by subtracting the demand from the supply and adding it to the current surplus/deficiency balance.

AppendixcTableC.2.PNG

Step 2: Determine the minimum tank capacity
To ensure sufficient water to a community, there must be enough water to last until the trough of the next day. This calculation is represented as;
Vtank = Vmax – Vmin – Vfinal
Vtank = 4,500L – (–5,400L) – 600L = 9,300L

The water storage tanks should be able to hold at least 9,300 L to suffice the need of the community. The designer should use 10,000 L storage tanks or use two 5,000 L storage tanks in sizing of the needed capacity.

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