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

Condenserless chiller
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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

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