21
∆
T
W
C
PF/PT
C
Pa
C
Qw
C
∆
pw1
3 0,975 1 1,63 2,64
4 0,99 1 1,24
1,53
5 1 1 1 1
6 1,015 1 0,85 0,72
7 1,03 1 0,74
0,54
8 1,04 1 0,65
0,42
All copying, even partial, of this manual is strictly forbidden.
RG66007970 - Rev 01
8.2
OPeRaTInG lIMITS In heaTInG MODe
8.3
TheRMal CaRRIeR FlUID
The units belonging to the
MPI DC
series can work with mixtures of water and up to 30% ethylene glycol�
8
OPeRaTInG lIMITS
9
CalCUlaTIOn FaCTORS
9.1
Change in operating parameters with ∆t other than 5°C
After identifying the unit's performance in the terms of the desired outlet water temperature, correct the value by multiplying it by the following corrective
coefficients�
∆t
W
Difference between water inlet temperature and water outlet temperature
C
PF/PT
Corrective coefficient of cooling/heating capacity
C
Pa
Correction coefficient of electrical input
C
Qw
Correction coefficient of water flow rate
C
∆pw1
Correction coefficient of pressure drop
9.2
WaTeR anD GlyCOl MIXTURe
Based on the minimum outlet water temperature, you can derive the percentage of ethylene glycol and the corrective coefficient using the table below�
PeRCenTaGe OF eThylene GlyCOl
0%
10%
20%
30%
40%
Minimum temp� of water produced
5°C
2°C
-5°C
-10°C
-15°C
Mixture freezing temp. (°C)
0°C
-4°C
-14°C
-18°C
-24°C
Capacity correction factor
1,000
0,998
0,994
0,989
0,983
Water flow rate correction factor
1,000
1,047
1,094
1,140
1,199
Pressure drop correction factor
1,000
1,157
1,352
1,585
1,860
Warning
The use of propylene glycol is not admitted with standard pumps� For further information, contact the manufacturer�
air temperature (°C)
Outlet water temperature (°C)
