Page 151 - Water_Controls_for_Public-Commercial

Solutions for thermostatic mixing valves /

4. SIZING THE APPROPRIATE PREMIX
Chart of PRESSURE
LOSSES:
The choice depends on the design corrected flow rate and pressure loss. Dynamic pressure drop
when operated under
1. Select the PREMIX size depending on design corrected flow rate for mixed water in the system. varying flow rates.
2. Check the PREMIX pressure loss. REMINDER: Check
Having established dynamic pressures at the thermostatic mixing valve inlet and the required residual pressure pipework pressure
for supplying the installation, select the model based on the associated pressure drop. losses (e.g. different
floor levels, extended
Example: supply pipes, etc.).
For a 50 lpm design flow rate: See chapter "Sanitary
The PREMIX ¾" records a 2.4 bar pressure loss as opposed to 0.9 bar for the PREMIX 1". technical data"
(page 260).
NB: When supply pressure is 3 bar (recommended), pressure loss should not exceed 1 bar.
Due to the diversity
of fittings possible,
this information is
not contractual and
PREMIX ¾" 1" 1¼" 1½" is for guidance only.
3 The designer remains
responsible for
determining the best
2
simultaneity coefficient
1.5 and TMV model.
1 0.9 THERMOSTATIC MIXING VALVES
Pressure drops P in bar 0.6
0.8
0.7

0.5
0.4

0.3

0.2

0.1
3 4 5 6 7 8 910 20 30 40 50 60 70 80 100 150 200
Flow rate in lpm

Thermostatic mixing valves 149