Operating Range - Mitsubishi Electric CLIMAVENETA NECS-ME Series Technical Bulletin

4.

OPERATING RANGE

Tc OUT [°C]: Heat exchanger temperature on source side (out)
Tev OUT [°C]: Cold exchanger temperature on user side (out)
ETHYLENE GLYCOL MIXTURE
Ethylene glycol and water mixtures, used as a heat-conveying fluid,
cause a variation in unit performance. For correct data, use the factors
indicated in the following table.
cPf
cQ
cdp
cPf: cooling capacity correction factor
cQ: flow correction factor
cdp: pressure drop correction factor
FOULING FACTORS
Performances are based on clean condition of tubes (fouling factor =1).
For different fouling values, performance should be adjusted using the
correction factors shown in the following table.
Encrustation factors
(m °C/W) 4,4 x 10
2 -5
(m °C/W) 0,86 x 10
2 -4
(m °C/W) 1,72 x 10
2 -4
f1 - f2 - f3: capacity correction factors
fk1 - fk2 - fk3: compressor power input correction factors
fx1 - fx2 - fx3: total power input correction factors
60
55
50
48
45
40
35
30
25
-5
-10
-8
0 -5
0 12%
1 0,985
1 1,02
1 1,07
Evaporator
f1 fk1
1 1
0,96 0,99
0,93 0,98
NECS-ME
0
5
7
Tev OUT [°C]
Limits to exchanger water temperature are valid within the minimum
- maximum water flow range indicated in the Hydraulic Data section.
Freezing point (°C)
-10 -15
Ethylene glycol percentage by weight
20% 30%
0,98 0,974
1,04 1,075
1,11 1,18
For data concerning other kind of anti-freeze solutions (e.g. propylene
glycol) please contact our Sales Department.
Heat recovery
fx1 f2 fk2
1 0,99 1,03
0,99 0,98 1,04
0,98 0,95 1,06
NECS_ME_0152_1604_201004_GB
13
10
15
-20 -25
35% 40%
0,97 0,965
1,11 1,14
1,22 1,24
Desuperheater
fx2 f3
1,03 0,99
1,04 0,98
1,06 0,95
20
-30 -35
45% 50%
0,964 0,96
1,17 1,2
1,27 1,3
fk3 fx3
1,03 1,03
1,04 1,04
1,06 1,06
HFC R410A