Hi Richard. This 62% diversity factor is also called the concurrency or simultaneity factor and is used to reduce the required capacity of production/distribution. During the initial heat network sizing, designers may opt to use one representative building heat demand profile for the year, and then aggregate this to say, 100 buildings. When 1 profile is multiplied by 100, the total annual load will be somewhat representative to reality, however, the annual peak demand (timing) is certainty not. Just imagine 100 distinct/separate building heat demand profiles stacked together on a graph. The chances that all 100 buildings have a simultaneously occurring peak demand is very unlikely. So, the aggregated peak from (1x100) buildings should be multiplied by 0.62 to derive a realistic peak for appropriate topological sizing. Remember, this 0.62 only applies to methods which aggregate a single heat demand profile to more than 25 dwellings. As shown @42.50, you would use 0.7 for 5 dwellings and of course 1 (no factor required) for one dwelling. Hopefully this makes sense!
What is the 62% method?
Hi Richard. This 62% diversity factor is also called the concurrency or simultaneity factor and is used to reduce the required capacity of production/distribution. During the initial heat network sizing, designers may opt to use one representative building heat demand profile for the year, and then aggregate this to say, 100 buildings. When 1 profile is multiplied by 100, the total annual load will be somewhat representative to reality, however, the annual peak demand (timing) is certainty not.
Just imagine 100 distinct/separate building heat demand profiles stacked together on a graph. The chances that all 100 buildings have a simultaneously occurring peak demand is very unlikely. So, the aggregated peak from (1x100) buildings should be multiplied by 0.62 to derive a realistic peak for appropriate topological sizing. Remember, this 0.62 only applies to methods which aggregate a single heat demand profile to more than 25 dwellings. As shown @42.50, you would use 0.7 for 5 dwellings and of course 1 (no factor required) for one dwelling. Hopefully this makes sense!