ASHRAE Journal - March 2014 - 76
Column Data centers
ignoring it since it did not pass a rapid "sniff test." After
all, back then there was limited information about the
actual heat release from IT hardware, which resulted
in people simply using equipment nameplate data.
Equipment nameplate data is provided due to regulatory
requirements and identifying safety issues. Nameplates
were never intended to be an accurate representation of
the load.
Trends Load Interpretations
People in the industry already had plenty of experience
in seeing the actual loads being a small percentage of the
design load and/or nameplate. In data centers, the net to
gross ratio for actual IT equipment footprint versus everything else required to support that equipment footprint
such as aisles, cross-aisles, power equipment, cooling
equipment, etc., could easily be 4:1.
Simply glancing at the trend charts of watts per square
foot without noticing it was equipment footprint would
result in a 4:1 error in interpretation of the error of
www.info.hotims.com/49802-47
76
ASHRAE JouRnAl
ashrae.org
March 2014
magnitude. This condition is probably the dominant
reason why the chart was misinterpreted and not actively
used by the industry.
Another common misinterpretation of the trend chart
was what the load really represented. It was very common to not populate 100% of a rack in the case of servers.
The reasons vary such as allowing rack space for future
equipment, controlling the proximity of some equipment to the other equipment or to limit the total kW per
rack due to power and cooling limitations. For network
gear, it is common to have much of the rack empty due
to switch and router chassis sizes not standard to 42U
racks. In addition, these routers and switches can be differently configured with different line cards for different customers.
In addition, the load can vary greatly in any given IT
equipment rack since the load is typically driven by the
use and load profile of the software (applications) being
run on the hardware. As a result, rarely is hardware 100%
loaded. Even in cases where there is a desire for higher
www.info.hotims.com/49802-41
ASHRAE Journal - March 2014
Table of Contents for the Digital Edition of ASHRAE Journal - March 2014
ASHRAE Journal - March 2014
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
2014 ASHRAE Technology Awards
Cold Weather Operation of Cooling Towers
Improving Operating Efficiency of Packaged Air Conditioners & Heat Pumps
Aligning IECC and Standard 90.1
Small Building, Vast Potential
Standing Columns
Building Sciences
Engineer's Notebook
Refrigeration Applications
Data Centers
HVAC Applications
Energy Modeling
People
Special Products
Classified Advertising
Advertisers Index
ASHRAE Journal - March 2014 - Intro
ASHRAE Journal - March 2014 - ASHRAE Journal - March 2014
ASHRAE Journal - March 2014 - Cover2
ASHRAE Journal - March 2014 - 1
ASHRAE Journal - March 2014 - 2
ASHRAE Journal - March 2014 - Contents
ASHRAE Journal - March 2014 - Commentary
ASHRAE Journal - March 2014 - 5
ASHRAE Journal - March 2014 - Industry News
ASHRAE Journal - March 2014 - 7
ASHRAE Journal - March 2014 - 8
ASHRAE Journal - March 2014 - 9
ASHRAE Journal - March 2014 - 10
ASHRAE Journal - March 2014 - 11
ASHRAE Journal - March 2014 - 12
ASHRAE Journal - March 2014 - 13
ASHRAE Journal - March 2014 - 14
ASHRAE Journal - March 2014 - 15
ASHRAE Journal - March 2014 - Letters
ASHRAE Journal - March 2014 - 17
ASHRAE Journal - March 2014 - Meetings and Shows
ASHRAE Journal - March 2014 - 19
ASHRAE Journal - March 2014 - 2014 ASHRAE Technology Awards
ASHRAE Journal - March 2014 - 21
ASHRAE Journal - March 2014 - 22
ASHRAE Journal - March 2014 - 23
ASHRAE Journal - March 2014 - 24
ASHRAE Journal - March 2014 - 25
ASHRAE Journal - March 2014 - Cold Weather Operation of Cooling Towers
ASHRAE Journal - March 2014 - 27
ASHRAE Journal - March 2014 - 28
ASHRAE Journal - March 2014 - 29
ASHRAE Journal - March 2014 - 30
ASHRAE Journal - March 2014 - 31
ASHRAE Journal - March 2014 - 32
ASHRAE Journal - March 2014 - 33
ASHRAE Journal - March 2014 - 34
ASHRAE Journal - March 2014 - 35
ASHRAE Journal - March 2014 - Improving Operating Efficiency of Packaged Air Conditioners & Heat Pumps
ASHRAE Journal - March 2014 - 37
ASHRAE Journal - March 2014 - 38
ASHRAE Journal - March 2014 - 39
ASHRAE Journal - March 2014 - 40
ASHRAE Journal - March 2014 - 41
ASHRAE Journal - March 2014 - 42
ASHRAE Journal - March 2014 - 43
ASHRAE Journal - March 2014 - Building Sciences
ASHRAE Journal - March 2014 - 45
ASHRAE Journal - March 2014 - 46
ASHRAE Journal - March 2014 - 47
ASHRAE Journal - March 2014 - 48
ASHRAE Journal - March 2014 - 49
ASHRAE Journal - March 2014 - Engineer's Notebook
ASHRAE Journal - March 2014 - 51
ASHRAE Journal - March 2014 - 52
ASHRAE Journal - March 2014 - 53
ASHRAE Journal - March 2014 - 54
ASHRAE Journal - March 2014 - 55
ASHRAE Journal - March 2014 - Aligning IECC and Standard 90.1
ASHRAE Journal - March 2014 - 57
ASHRAE Journal - March 2014 - 58
ASHRAE Journal - March 2014 - 59
ASHRAE Journal - March 2014 - 60
ASHRAE Journal - March 2014 - 61
ASHRAE Journal - March 2014 - Refrigeration Applications
ASHRAE Journal - March 2014 - 63
ASHRAE Journal - March 2014 - Small Building, Vast Potential
ASHRAE Journal - March 2014 - 65
ASHRAE Journal - March 2014 - 66
ASHRAE Journal - March 2014 - 67
ASHRAE Journal - March 2014 - 68
ASHRAE Journal - March 2014 - 69
ASHRAE Journal - March 2014 - 70
ASHRAE Journal - March 2014 - 71
ASHRAE Journal - March 2014 - 72
ASHRAE Journal - March 2014 - 73
ASHRAE Journal - March 2014 - Data Centers
ASHRAE Journal - March 2014 - 75
ASHRAE Journal - March 2014 - 76
ASHRAE Journal - March 2014 - 77
ASHRAE Journal - March 2014 - 78
ASHRAE Journal - March 2014 - 79
ASHRAE Journal - March 2014 - 80
ASHRAE Journal - March 2014 - 81
ASHRAE Journal - March 2014 - HVAC Applications
ASHRAE Journal - March 2014 - 83
ASHRAE Journal - March 2014 - 84
ASHRAE Journal - March 2014 - 85
ASHRAE Journal - March 2014 - 86
ASHRAE Journal - March 2014 - 87
ASHRAE Journal - March 2014 - 88
ASHRAE Journal - March 2014 - 89
ASHRAE Journal - March 2014 - 90
ASHRAE Journal - March 2014 - 91
ASHRAE Journal - March 2014 - 92
ASHRAE Journal - March 2014 - 93
ASHRAE Journal - March 2014 - 94
ASHRAE Journal - March 2014 - 95
ASHRAE Journal - March 2014 - Energy Modeling
ASHRAE Journal - March 2014 - People
ASHRAE Journal - March 2014 - Special Products
ASHRAE Journal - March 2014 - 99
ASHRAE Journal - March 2014 - 100
ASHRAE Journal - March 2014 - 101
ASHRAE Journal - March 2014 - Classified Advertising
ASHRAE Journal - March 2014 - 103
ASHRAE Journal - March 2014 - Advertisers Index
ASHRAE Journal - March 2014 - Cover3
ASHRAE Journal - March 2014 - Cover4
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_MCDEBX
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_WNYSQY
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_XATVOD
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_FJSHSS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_CCBZDS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_XDEFVG
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2023november_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2023november
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_VHGNBL
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_WPKBNJ
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_UUVCDE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_RTGDEW
https://www.nxtbook.com/nxtbooks/ashrae/ashraemexico_2023
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_LKRFXS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_AZSOFG
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_ERCDBH
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_QWDFRV
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_JHGVDF
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_OPUYHG
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SREIBM
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_LRTGLK
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_OKRFGH
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2022november_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2022november
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_TZSERA
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_LVRUIX
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_RPTVYZ
https://www.nxtbook.com/nxtbooks/ashrae/mini_pub_catalog
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_XIYTGD
https://www.nxtbook.com/nxtbooks/ashrae/ashraemexico_2022
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_RFGDOB
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_PABXNU
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_REMKLS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_PICVBT
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_AOYTVW
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_JQOPLS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_IOYTBC
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SGAJJF
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_IGHYER
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_PDRKLS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2021november
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2021november_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_XCODFR
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_QSLFGO
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_ILKVNM
https://www.nxtbook.com/nxtbooks/ashrae/ashraemexico_2021
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_OPDJKD
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_VJKSRY
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SDHUTC
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_JPPKRR
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SDLTTH
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_CKLLES
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_SLDOX
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_HJETUK
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_OLUHGE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2020october
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2020october_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_ZERDGH
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_QVMNEO
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_RTPOKE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_BBATRE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_STUBMW
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_TPEMPE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_JNMKDS
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_FBTTPA
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_WQMMNE
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_TVBRYN
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_showguide2020
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_KTUZMA
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_ABEDGD
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201910
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201909
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2019septmeber_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2019september
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201908
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201907
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201906
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201905
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201904
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2019april
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201903
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2019march
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201902
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201901
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_showguide2019
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2018december
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2018november
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2018fall_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2018fall
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_2018october
https://www.nxtbook.com/nxtbooks/ashrae/ashraemexico_2018
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201810
https://www.nxtbook.com/nxtbooks/ashrae/ashraeinsights_201806
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201805
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201804
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201803
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201712
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201711
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201710
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2017fall_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2017fall
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201709
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201705
https://www.nxtbook.com/nxtbooks/ashrae/ashrae_meetinginsert_201610
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2016fall_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2016fall
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_acrexindia
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2015summer_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_amca_2015summer
https://www.nxtbook.com/nxtbooks/amca/2014summer2
https://www.nxtbook.com/nxtbooks/amca/2014summer
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_acma_2014summer
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201311
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201309
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_acmasupp_2013fall
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201305
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201303
https://www.nxtbook.com/nxtbooks/ashrae/pubcatalog_2013winter
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201211
https://www.nxtbook.com/nxtbooks/ashrae/achr_expo_mexico2012
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201209
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201208_v3
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201208_v2
https://www.nxtbook.com/nxtbooks/ashrae/pubcatalog_2012summer
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201205
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201203
https://www.nxtbook.com/nxtbooks/ashrae/pubcatalog_2012winter
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201111_v2
https://www.nxtbook.com/nxtbooks/ashrae/ashraejournal_201109_v2
https://www.nxtbook.com/nxtbooks/ashrae/pubcatalog_2011summer
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201105
https://www.nxtbook.com/nxtbooks/ashrae/meetingplanner_201103
https://www.nxtbookmedia.com