Water Supply - Calculating Expected Demand
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Ads by Google ► Water Lines ► Calculation ► Water Usage ► Water Pipes Search - "Search is the most efficient way to navigate the Engineering ToolBox!" Water Supply - Calculating Expected Demand Calculating of expected demand in water supply service lines Sponsored Links Flow Meters Wholesale alibaba.com/Flow-Meters Find Quality Products from Verified Suppliers. Get a Live Quote Now! The total theoretical demand for a water supply system can easily be calculated by adding all fixtures known maximum demand. Due to the nature of intermittent use the number of fixtures will unfortunate add up to unrealistic demands for the main supply lines to handle. A realistic demand for a supply system will always be far less than the total theoretical demand. The expected demand in a water supply system can be estimated like q et = q nl + 0.015 ( Σq n - q nl ) + 0.17 ( Σq n - q nl ) 1/2 (1) where q et = expected total water flow (l/s) q nl = demand of largest consumer (l/s) Σq n = total theoretical water flow - all fixtures summarized (l/s) Note that the minimum expected total water flow can never be less than the demand from the largest fixture. The equation is valid for more ordinary systems where the consumption patterns are more continuously as in homes offices nursing homes etc. Be aware when using the equation for systems serving large groups of people where the use is intermittent, like in hotels hospitals schools theaters wardrobes in factories etc It may be typical for applications like this, like a wardrobe, that all showers are used at the same time. Using the formula blindly would result in insufficient supply lines. Example - Main Water Supply to a Nursing Home If the theoretical demand from all fixtures in a nursing home adds up to 50 l/s and the larges fixture requires 0.4 l/s, the expected water supply demand can be estimated like q et = (0.4 l/s) + 0.015 ((50 l/s) - (0.4 l/s)) + 0.17 ((50 l/s) - (0.4 l/s)) 1/2 = 2.3 (l/s) Total Theoretical Water Flow and Expected Flow Expected demand for a supply system at different total theoretical demand can based on the formula above be expressed as Total Theoretical Demand Summarized (liter/s) Expected Demand (liter/s) 0.2 0.2 0.8 0.4 1.6 0.5 4.0 0.6 8.0 0.85 15 1.1 20 1.5 30 1.8
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Water Supply - Calculating Expected DemandCalculating of expected demand in water supply service lines
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The total theoretical demand for a water supply system can easily be calculated by adding all fixtures known maximum demand. Due to the nature ofintermittent use the number of fixtures will unfortunate add up to unrealistic demands for the main supply lines to handle. A realistic demand for asupply system will always be far less than the total theoretical demand.
The expected demand in a water supply system can be estimated like
qet = qnl + 0.015 ( Σqn - qnl ) + 0.17 ( Σqn - qnl )1/2 (1)
where
qet = expected total water flow (l/s)
qnl = demand of largest consumer (l/s)
Σqn = total theoretical water flow - all fixtures summarized (l/s)
Note that the minimum expected total water flow can never be less than the demand from the largest fixture. The equation is valid for more ordinarysystems where the consumption patterns are more continuously as in
homesofficesnursing homesetc.
Be aware when using the equation for systems serving large groups of people where the use is intermittent, like in
hotelshospitalsschoolstheaterswardrobes in factoriesetc
It may be typical for applications like this, like a wardrobe, that all showers are used at the same time. Using the formula blindly would result ininsufficient supply lines.
Example - Main Water Supply to a Nursing HomeIf the theoretical demand from all fixtures in a nursing home adds up to 50 l/s and the larges fixture requires 0.4 l/s, the expected water supplydemand can be estimated like
qet = (0.4 l/s) + 0.015 ((50 l/s) - (0.4 l/s)) + 0.17 ((50 l/s) - (0.4 l/s))1/2
= 2.3 (l/s)
Total Theoretical Water Flow and Expected FlowExpected demand for a supply system at different total theoretical demand can based on the formula above be expressed as
Total Theoretical Demand Summarized(liter/s)
Expected Demand(liter/s)
0.2 0.2
0.8 0.4
1.6 0.5
4.0 0.6
8.0 0.85
15 1.1
20 1.5
30 1.8
40 2.165 2.8
70 2.9
100 3.7
The maximum fixture load is 0.2 liter/s.
Water Supply - Expected Demand (pdf)
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