Link
https://www.en-standard.eu/din-1988-300-codes-of-practice-for-drinking-water-installations-part-300-pipe-sizing-dvgw-code-of-practice/energiforetagen.se/globalassets/energiforetagen/det-erbjuder-vi/publikationer/f101-district-heating-substations-design-and-installation.pdf
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 (a 0.0417 + 0.015 * (T)^b - c) / T0,0555N-0.0417) + 0,0775 * sqrt(0,0555N-0.0417)) / N*0,0555), in which T N is the sum of the design flows (for hot water) of all individual taps.
For apartments : a = 1.48, b=0.19, c=0.94
For hospitals : a = 0.75, b=0.44, c=0.18
For hotels : a = 0.70, b=0.48, c=0.13
This formula only applies when 0.2 <= T and T <= 500.
It is important to note that calculation is applicable for T expressed in liter per seconds.
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number of dwellings.
The diversified flow rate for one dwelling is calculated based on the default power 38 kW as mentioned in the F:101, in combination with the temperature regimes as defined by the user.
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Variant for high DHW usage
We also support the variant for high DHW usage. With this calculation method, the diversity factor decreases according to the formula (0.0417 + 0.015 * (0.0555N-0.0417) + 0.0775 * sqrt(0.0555N-0.0417)) / N*0.0555), in which N is the number of dwellings. The concurrent flow rate for one dwelling is calculated based on the default power 38 kW as mentioned in the F:101.
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Applies diversity
- inside the dwelling
- outside the dwelling
Requires recalculation of DHW flows?
Yes. This standard assumes a DHW regime of 15°C for cold water and 60°C for hot water, resulting in a mixed temperature of 37,5°C (when both flows are equals). If the temperatures in the Hysopt model deviate from this standard regime, the design flows for cold and hot water are first recalculated (in order to achieve a mixed design flow of 37,5°C), see Step 1 : recalculation of the tapflows for more info.
Remarks
For appartments with low volume flows, there is a small “strange“ bump in the diversity graph if you apply the formula
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No.