THE USE OF A GLYCOL-BASED SOLUTION IS THE ONLY EFFECTIVE FROST-PROTECTION MEANS
Caution
24 SYSAER R32
Draining the water circuit is not recommended for frost protection, for the following reasons:
²
The water circuit will rust, which will shorten its lifetime.
²
Water will remain at the bottom of the plate exchangers and freezing may cause damage.
The glycol-based water solution must be sufficiently concentrated to ensure appropriate protection and
prevent ice from forming. Take precautions when using non inert MEG antifreeze solutions (Mono Ethylene
Glycol) or MPG (Mono Propylene Glycol). With this type of antifreeze solution, corrosion may occur in the
presence of oxygen.
Contact glycol resellers to ensure that its characteristics are compatible with environmental directive
applicable on site (this is not under manufacturer responsibility).
Glycoling the water loop worsens slightly the performances, in particular the pressure drops. The hereunder
table gives corrective factors with respect of type and concentration of the glycol. For instance, the 20%
MEG glycoling will :
²
Increase the pressure drops : with glycol = 1.129 x without glycol
²
Increase the flowrate : with glycol = 1.040 x without glycol
²
Decrease the capacity : with glycol = 0.982 x without glycol
Concentration
%
10
20
30
Glycol
MEG
MPG
MEG
MPG
MEG
MPG
Correction
factor
pressure drops
1.070
1.068
1.129
1.147
1.181
1.248
water flow
1.013
1.010
1.040
1.028
1.074
1.050
thermodynamic power
0.991
0.987
0.982
0.975
0.972
0.962
11.2. FROST PROTECTION
11.2.1. WATER LOOP GLYCOLING
Summary of Contents for AC-RSR105R32HEC
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