Galletti EXCELIA MXE 009 Manual - Mxe
RG66004088 - Rev 00
All copying, even partial, of this manual is strictly forbidden.
MXE
6.3
THERMAL CARRIER FLUID
The units belonging to the MxE series can work with mixtures of water and up
to 30% ethylene glycol.
9
CALCULATION FACTORS
9.1
CHANGE IN OPERATING PARAMETERS WITH
ΔT 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.
DT
W
C
PF/PT
C
PA
C
Qw
C
Dpw1
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
LEGEND
DT
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
Dpw1
Correction coefficient of pressure drop
8
OPERATING LIMITS
8.2
OPERATING LIMITS IN HEAT PUMP MODE
TBS
1
Outdoor temperature (dry bulb)
Tw
2
Outlet water temperature
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.
20
25
30
35
40
45
50
55
60
-20
-15
-10
-5
0
5
10
15
20
25
Tbs
1
(°C)
TW
2
(°C
)