Introduction
Domestic hot water flow rates have always been challenging to calculate, because we need to take into account the simultaneous usage of hot water tapping points. Not all tapping points (like showers) will be use at the same time, so a so we need to take into account in each part of the system, the maximum probability, or the maximum DHW flow of simultaneous tapping points. These are defined in diversity standards. Most of these methods only account for simultaneous flow rates, and not for simultaneous power, because domestic hot water networks are mostly operated as single pipe / fixed temperature systems.
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diversity is a kind of “statistic“ calculation, defining the maximum percentage of simultaneous DHW tappings
regime changing components introduce a difference in primary and secondary volume flow, and a difference in primary and secondary temperatures,
but they will not introduce a difference in primary and secondary diversity or primary and secondary power
Standards
Hysopt incorporates lots of diversity standards for DHW (DHW ad CH.
On request we are happy to add new or additional diversity calculation methods in the Hysopt software.
DHW
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Based on Cibse CP1
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Danish Code of Practice 439
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Swedish regulation DHA F:101
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French Costic MTA 2016
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French DTU 60-11
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CH
Cibse CP1.2
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Logarithmic
Overview
To explain diversity and aggregation, we use following example model of 2 HIU’s.
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