...
The question is : how to calculate the diversity factor f3, total power P3 and diversity flow v3 for DHW?
We calculate these in following order :
P3 = P1 + P2 (first law of thermodynamics)
f3 is recalculated based on the applicable diversity standard, applied on the TOTAL amount of tapflow or TOTAL amount of dwellings on the secondary side.
The diversified power is equal to f3 * P3
the supply temperature t3supply is defined by the user
the return temperature t3return is calculated as the mixed return temperature of flow 1 and flow 2 (v3 * t3return = v1 * t1return + v2 * t2return). This means that the return temperature is not a direct result of the diversity, but a result of the components (like heat exchangers) and the mixing rules
the diviersity volume flow v3 is calculated using the formula
in which P is the diversity power f3 * P3, m is the diversity massflow (which can be converted to the diversity volumeflow), T1 is the return temperature t3return, T2 is the supply temperature t3supply
| Note |
|---|
Allthough P1 + P2 = P3 it is important to mention that :
This is a typical effect of the diversity, and sometimes experienced as contra intuitive |