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/ Solutions for thermostatic mixing valves
Normal or low frequency The choice of PREMIX thermostatic mixing valve depends upon the installation type, the frequency of simultaneous
of simultaneous use: use (coefficient), the number of points-of-use, and the dynamic water pressure at the PREMIX inlets.
The following formula To select the appropriate PREMIX for an installation, it is necessary to calculate the design corrected flow rate.
is recommended as
a means of determining
the simultaneity coefficient:
0,8 1. DETERMINING THE COEFFICIENT OF SIMULTANEOUS USE
√x-1
(x represents the number
of points-of-use) It depends on type of site (public and commercial places) and number of points-of-use to supply.
Simultaneity coefficient
High-frequency
of simultaneous use High simultaneity Normal/low simultaneity
(public places):
Number of taps and valves to be connected frequency frequency
DELABIE recommends Sport stadia, schools, Hospitals, hotels, offices,
using the following formula boarding schools, camp apartment blocks, social
to determine the simultaneity
coefficient: sites, etc. housing, etc.
2 1 - 5 1 1
√x-1 5 - 10 1 0.5
(x represents the number 10 - 15 0.6 0.3
of points-of-use)
15 - 25 0.5 0.3
25 - 40 0.4 0.2
Exceptionally high-frequency:
40 - 60 0.3 0.15
Use of coefficient 1
for up to 15 points-of-use. More than 60 0.2 0.1
2. CALCULATING GROSS FLOW RATE
The expected flow rate depends on operating flow rate for each type of outlet
(refer to manufacturer's data sheets for tap and valve flow rates).
Flow rate Number of fittings Total gross flow rate
DELABIE time flow basins 3 lpm x ... = ...
DELABIE time flow showers 6 lpm x ... = ...
Basin, sink, shower, bidet 12 lpm x ... = ...
Bath tub 20 lpm x ... = ...
TOTAL GROSS FLOW RATE for all points-of-use
3. CALCULATING THE DESIGN FLOW RATE
To supply installation branch.
Total gross Simultaneity Design corrected flow rate
flow rate x coefficient = for mixed water
148 Thermostatic mixing valves
