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With the temperature regime as defined by the standard, the shower tapflow tap flow would result in 0,15 l/s @60°C and 0,15 l/s @15°C
This results in an overall flow of 0,30 l/s @ 37,5°C. Thast’s That’s the “goal situation“ we want to design to.
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The equations we have to solve for the example to reach the same goal situations are :
VDHW + VCHW DCW = 0,30 l/s
50°C * VDHW + 10°C * VDCW = 37,5°C * 0,30 l/s
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