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Chiller integrated free-cooling operation
mode
The power of chiller integrated free-cooling relies on
Sound power levels
the chiller control to maximize the use of free-cooling
when outdoor temperatures are favorable. The choice
between compressor refrigeration and Free-Cooling
Discharge
refrigeration will be made and activated depending on
three temperature measurements:
Measurement conditions:
• The ambient air temperature
Measurements taken in a room adjacent to the room containing the FWD, at the outlet of the rectangular duct (1.5 m
long) fixed to its discharge opening.
• The evaporator entering and leaving temperature
• The chilled water set point
Fan
Free-cooling coils are fit in series with the evaporator,
Unit
speed
and a set of water regulation valves allows the coils
1
FWD 08
2
to be by-passed when they are no longer needed due
3
to outdoor temperatures which are favorable for free-
1
cooling.
FWD 10
2
3
Three operating modes can be differentiated:
1
1.
Summer operation or Compressor refrigeration mode
FWD 12
2
3
In this operation mode, ambient temperature is higher
1
than the temperature of the fluid entering the evaporator.
FWD 14
2
Free-cooling is not activated, compressors are running, and
3
control is done in function of the fan/compressor logic of
1
FWD 20
2
operation.
3
2.
Mid-season operation or combined refrigeration + Free-
cooling mode
Intake
In this operation mode, free-cooling will be enabled
whenever the outdoor temperature is below the evaporator
Measurement conditions:
entering water temperature. The operating logic is described
Measurements taken at the horizontal air intake.
below. The free-cooling system operates combined with the
mechanical compressor refrigeration. Most of the time, free-
Fan
cooling will only partially cover the required cooling duty. In
Unit
speed
other words, mechanical refrigeration will complete what
1
FWD 08
2
has already been delivered by free-cooling.
3
3.
Winter operation or Full free-cooling mode
1
FWD 10
2
Below a certain ambient temperature, and depending on the
3
chilled water set point requested, the entire cooling duty is
1
delivered by the free-cooling system. Compressors do not
FWD 12
2
operate, since the free-cooling coils will be able to deliver
3
1
the requested chilled water temperature. The regulation of
FWD 14
2
the capacity is described in the next section. In this mode,
3
only fans are running.
1
FWD 20
2
3
CTV-SVX009D-GB
UNT-PRC002-GB
Power level in dB(A), per Hz frequency band
125
250
500
55
50
42
57
54
47
58
57
50
57
51
45
58
54
48
60
58
50
57
51
45
58
54
48
60
58
50
56
62
50
61
66
55
63
69
58
57
63
51
61
66
55
63
69
58
Power level in dB(A), per Hz frequency band
125
250
500
56
55
55
63
62
60
66
65
63
62
58
55
66
63
60
70
67
63
62
58
55
66
63
60
70
67
63
66
65
65
73
72
69
78
76
73
68
72
64
76
76
68
78
79
71
Optional Free-Cooling
General information
The chiller integrated free-cooling system fluid based consist
in a set of "Macro-channels" or "Radiators" coils, fit in the
same frame than the MCHE condenser coils of the chiller
refrigerant circuit. Free-cooling coils will be full aluminum,
flat radiator design type, with low air pressure drop to avoid
fan performances degradation.
Free-cooling coils are fit in series with the evaporator, and a
set of water regulation valves ensures the system to reach
the required free-cooling capacity.
1000
2000
37
37
40
30
42
32
42
34
45
38
48
40
42
34
45
38
48
40
48
39
53
47
56
50
49
40
53
47
56
50
1000
2000
53
46
60
53
62
56
58
51
62
56
65
59
58
51
62
56
65
59
65
57
71
64
75
69
64
56
71
65
74
69
Overall power
4000
8000
dB(A)
31
30
46
38
40
50
40
43
53
33
28
48
39
35
51
42
39
54
33
28
48
39
35
51
42
39
54
38
36
56
46
45
60
50
49
63
39
37
57
46
45
60
50
49
63
Overall power
4000
8000
dB(A)
45
42
57
53
53
64
55
57
67
48
44
61
55
52
66
59
57
69
48
44
61
55
52
66
59
57
69
50
46
68
59
57
74
64
63
78
52
50
69
61
61
75
66
66
78
11
27
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