E24254-01
Appendix E Electrical Conversions 175
Electrical Conversions
Single Phase:
For example:
A medium-sized server is plugged into a 120 VAC 60 Hz power
source and is rated at 6.0 amps.
120 VAC
x
6 amps
x
0.85 (PF) = 612
÷
1,000 is 0.612 kW
208–240 Two Phase:
For example:
A server using a 220 VAC power source is rated at 4.7 amps.
220 VAC
x
4.7 amps
x
2 (phases)
x
0.85 (PF) = 1757.8
÷
1,000 = 1.76 kW
Three Phase:
Note:
For 3-Phase power configurations you also need to multiply by 1.73.
For example:
A large disk subsystem has 192 physical volumes, a power
source of 208 VAC, and is rated at 22 amps.
208 VAC
x
22 amps
x
1.73
x
0.85 (PF)
÷
1000 = 6.729 kW
To Convert Between kW and kVA
The only difference between kW and kVA is the power factor. Once again, the
power factor is an approximation (unless already known). For purposes of our
calculations, we will use a power factor of 0.85.
Note:
The kVA value is always higher than the value for kW.
kW divided by 0.85 = kVA
kVA multiplied by 0.85 = kW
To Find British Thermal Units From Electrical Values
The commonly used method for converting electrical values to British Thermal
Units is:
3.41214
x
Watts = Btu/hr
or
1 kW = 3 413 Btus
Many manufacturers publish kW, kVA and Btu in their equipment
specifications. Often, dividing the Btu value by 3413 does not equal the
published kW value.
•
Where the information is provided by the manufacturer, use it.
•
Where it is not, use the formula.
Содержание StorageTek StreamLine SL8500
Страница 4: ...Summary of Changes iv SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Страница 12: ...Contents xii SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Страница 18: ...Tables xviii SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Страница 76: ...Introduction 56 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Страница 97: ...E24254 01 Chapter 3 Site Survey Forms 77 Site Survey Forms Figure 21 Content Management Plan ...
Страница 98: ...Site Survey Forms 78 SL8500 Systems Assurance Guide July 2011 E24254 01 Figure 21 Content Management Plan ...
Страница 137: ...E24254 01 Chapter 4 Site Preparation 117 Site Preparation ...
Страница 138: ...Site Preparation 118 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Страница 163: ...E24254 01 Appendix A Content Management 141 Content Management Figure 47 Content Management Work Sheets ...
Страница 164: ...Content Management 142 SL8500 Systems Assurance Guide July 2011 E24254 01 Figure 47 Content Management Work Sheets ...
Страница 198: ...Electrical Conversions 176 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Страница 206: ...Comparisons 184 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Страница 233: ...E24254 01 Appendix H Partitioning 211 Partitioning Make copies as necessary ...
Страница 240: ...Partitioning 218 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Страница 251: ...E24254 01 Appendix J Work Sheets 229 Work Sheets Figure 73 Content Management Work Sheet ...
Страница 276: ...Index 254 SL8500 Systems Assurance Guide June 2011 E24254 01 ...
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Страница 278: ...Oracle Corporation Worldwide Headquarters 500 Oracle Parkway Redwood Shores CA 94065 U S A ...