Mitsubishi Electric CLIMAVENETA NECS-ME 0152, Технический бюллетень

Страница: 17 / 35

4. OPERATING RANGE
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.
Freezing point (°C)
0 -5 -10 -15 -20 -25 -30 -35
Ethylene glycol percentage by weight
0 12% 20% 30% 35% 40% 45% 50%
cPf 1 0,985 0,98 0,974 0,97 0,965 0,964 0,96
cQ 1 1,02 1,04 1,075 1,11 1,14 1,17 1,2
cdp 1 1,07 1,11 1,18 1,22 1,24 1,27 1,3
cPf: cooling capacity correction factor
cQ: flow correction factor
cdp: pressure drop correction factor
For data concerning other kind of anti-freeze solutions (e.g. propylene
glycol) please contact our Sales Department.
Encrustation factors
Evaporator Heat recovery Desuperheater
f1 fk1 fx1 f2 fk2 fx2 f3 fk3 fx3
(m
2
°C/W) 4,4 x 10
-5
1 1 1 0,99 1,03 1,03 0,99 1,03 1,03
(m
2
°C/W) 0,86 x 10
-4
0,96 0,99 0,99 0,98 1,04 1,04 0,98 1,04 1,04
(m
2
°C/W) 1,72 x 10
-4
0,93 0,98 0,98 0,95 1,06 1,06 0,95 1,06 1,06
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.
f1 - f2 - f3: capacity correction factors
fk1 - fk2 - fk3: compressor power input correction factors
fx1 - fx2 - fx3: total power input correction factors
Tc OUT [°C]: Heat exchanger temperature on source side (out)
Tev OUT [°C]: Cold exchanger temperature on user side (out)
Limits to exchanger water temperature are valid within the minimum
- maximum water flow range indicated in the Hydraulic Data section.
40
50
15
10 0 -10 20
60
48
30
-8 7
35
45
25
55
5
-5
Tev OUT [°C]
Tc OUT
[°C]
13
NECS_ME_0152_1604_201004_GB
NECS-ME
HFC R410A