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Table 18. Required building chilled water conditions - (14
Chilled water per Water
Number
Max kw to
Conditioning Unit
of nodes
water
(Water-cooled)
Flow (LPM)
1
7
Pressure Drop (Bar)
Outlet temp
Flow (LPM)
2
10
Pressure Drop (Bar)
Outlet temp
Flow (LPM)
3
14
Pressure Drop (Bar)
Outlet temp
Flow (LPM)
4
18
Pressure Drop (Bar)
Outlet temp
Notes:
1. Units are liters/minute, bars, and
2. Temperature of water out of WCU that cools the server is dependent on measured dew point as well as building
water temperature. MCM performance is unaffected as long as dew point does not exceed 17
water does not exceed 20
in more humid environments or in cases with warm building chilled water. If building chilled water exceeds
0
20
C or room dew point exceeds 17
may lower processor frequency.
Attention:
IBM will supply and use a deionized (DI) water solution that is mixed with benzotriazole (BTA), a
corrosion inhibitor, for use within the system side cooling loop of water cooled products. BTA is
mixed with the deionized water to a concentration of 1000 parts per million by weight. The customer
must dispose of the water solution in accordance with applicable laws and regulations and product
characteristics at the time of disposal.
The Service Support Representative (SSR) will fill or drain the system of this solution as required for an
install, uninstall, or some maintenance procedures, such as a book replace. The Fill and Drain kit and
water container should be stored where the SSR can readily access it as needed, and it should be stored
in a climate controlled environment with the other system service tools and equipments needed to install,
service, relocate, or discontinue a system. The Fill and Drain kit is used for a water-cooled system or a
radiator-cooled system. The water container holds 15.5 – 16.0 liters (4 gallons) of deionized water mixed
with a concentration of 0.1% (900-1000 ppm) of Benzotriazole (BTA) by weight.
For detection and location reporting of potential fluid leaks, there are leak detection systems you can use
beneath a raised floor. These systems are generally used to detect leaks from glycol, condenser water, and
chilled water cooling piping, humidification feed water piping. If desired, these sensor detection systems
can be used to monitor for potential product leaks, such as the BTA water solution, which is 99.9%
deionized water.
Glycol will lower the thermal efficiency of heat exchangers. Its effect will vary by concentration and
possibly heatload. Tables provided in this documentation show how much building chilled water to
supply versus configuration for chilled water without glycol. Customers should be aware that glycol has
a diluting effect on heat transfer properties versus pure water. That means if used in a rear door heat
0
C
0
C
0
C
0
C
0
C. These conditions must be available to each of the water conditioning units.
0
C. However, the amount of heat removed by rear of frame heat exchangers is reduced
0
C, the water to server temperature will continue to rise and at some point
0
0
C - 20
C)
Building chilled water in
0
0
0
14
15
16
13.5
16
20
0.34
0.34
0.34
21
21
21
20
24
27
0.34
0.34
0.35
21
21
21
30
33
35
0.37
0.44
0.50
21
21
22
40
45
50
0.63
0.80
1.0
20
21
21
Chapter 3. Models and physical specifications
Level 01f
0
C
0
0
0
17
18
19
20
20
20
25
0.34
0.34
0.34
0.34
21
22
23
30
30
35
0.37
0.37
0.50
0.50
22
23
23
40
40
42
0.63
0.63
0.70
0.80
22
23
24
50
50
50
1.0
1.0
1.0
22
23
24
0
C and building
0
25
24
35
24
45
24
55
1.2
24
55
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