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Hysopt incorporates diversity for DHW (DIN 1988-300, Cibse CP1, Danisdh Code of Practice 439, Swedish regulation DHA F:101, French Costic MTA 2016, French DTU 60-11, …) and diversity for central heating (Cibse CP1.2, logarithmic, …).
We have extended the calculation to cope with simultaneous diversified central heating and domestic hot water usage, and with combination of power needed in mixed systems.

Hereby we take some principles into account :

• 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

Overview

To explain diversity and aggregation, we use following example model of 2 HIU’s.

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First of all, we make a distinction between the calculations within one dwelling, and the calculations over multiple dwellings.

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Within

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a single dwelling

Step 1 : recalculation of the tapflows

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Step 4 : aggregation of the DHW flow/power with the CH flow/power at CH side

Over multiple dwelling

Step 5a : propagate the DHW flow/power

Step 5b : propagate the CH flow/power

Step 6 : aggregation of the DHW flow/power with the CH flow/power

Example (outdated)

Consider a system of appartments, each having a satellite heat exchanger for instantaneous domestic hot water production. To keep the example simple, we assume each appartment to have a DHW heat load of 40kW with a temperature regime of 70°C / 30°C, and a 15kW central heating heat load, with a temperature regime of 70°C / 60°C. This results in following flow rates in relation to n. We use M for total mass flow.

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