Link

https://www.cibse.org/knowledge/knowledge-items/detail?id=a0q200000090MYHAA2

Application

Domestic Hot Water

This standard calculates the diversity based on

•  Number of tapping points
•  Type of the tapping points
•  Total DHW flow
•  Diversified DHW flow
•  Number of dwellings

Diversity formula

With this calculation method, the diversity factor decreases according to the formula (1.19 * N + 18.8 * N^0.5 + 17.6) / (37.5*N), in which N is the number of dwellings.

The diversified flow rate for one dwelling is calculated based on the default power 37,5 kW as mentioned in the DS 439 (CIBSE CP1 2015).

...

Applies diversity

•  inside the dwelling
•  outside the dwelling

Requires recalculation of DHW flows?

No.