ASHRAE Journal - June 2011 - 24

letters
go on to advocate smaller allowances (down to 0.25 W/ft2) for computers. Figure 1, in particular, is misleading since it does not identify itself as limited to computer use. The latest chart I have from the EIA (P. 52) shows computers at 4% of a commercial building’s load. Using the 2003 CBECS, one could surmise computers represent 4% of 91,000 Btu/ft2·yr, which equates pretty well, at 0.4 W/ft2, with the article’s figures. However, the article ignores all other plug and process loads. The EIA diagram shows computers at 4%, cooking at 2%, electronics at 8%, refrigeration at 4%, and other at 14%. All of these other unregulated loads add up to 32% or eight times that of just computers. The 2009 ASHRAE Handbook—Fundamentals, Chapter 18, Table 10, addresses miscellaneous office equipment including mail processing, vending machines, coffee makers, paper shredders, etc., all of which, as unregulated loads, represent significant energy use. So while it is important to identify the trend in reduction of office computer loads, it is equally important not to mislead the readers into believing that plug and process loads in general are being reduced. They are in fact still trending higher. Gordon V.R. Holness, Presidential Member/Fellow ASHRAE, West Palm Beach, Fla. and this may not have been as clear as we had hoped based on the title we selected. Other elements can contribute to overall plug load magnitudes such as microwave ovens, shredders, etc. From a cooling load perspective, these do not generally have a big impact but would need to be considered when applying a plug load factor, especially for spaces such as kitchenettes. One distinction that we feel is important to point out is that when performing cooling load calculations, plug loads are dealt with differently than process loads, such as cooking and refrigeration. We feel that the data we presented supports the conclusion that plug loads have experienced a recent decrease, largely due to advances in computer and monitor technology. The broader category of unregulated loads (which includes plug loads, process loads, and other loads) does not appear to be decreasing based on the information that Mr. Holness has provided, although not all loads that impact energy consumption also impact cooling load. Christopher K. Wilkins, P.E., Member ASHRAE, South Burlington, Vt. And Mohammad H. Hosni, Ph.D., Fellow ASHRAE, Manhattan, Kan. Errata In April’s Solar NZEB column, the labels HP Water Heater and Electric Water Heater were reversed in Figure 2.

The Authors Respond
Mr. Holness is correct that the focus of our article was on typical office data processing equipment such as computers,

www.info.hotims.com/33865-45

24

ASHRAE Journal

June 2011



ASHRAE Journal - June 2011

Table of Contents for the Digital Edition of ASHRAE Journal - June 2011

Contents
Commentary
Industry News
Meetings and Shows
Letters
Feature Articles
Saving Energy in Lab Exhaust Systems
System Effect: To Believe It Is to See It
What’s New in ASHRAE’s Standard on Comfort
On the Path to Net Zero: How Do We Get There From Here?
Technology Award Case Studies:
Walls to Heat, Cool
Building Sciences
Solar NZEB Project
HVAC Mythbuster
Emerging Technologies
IAQ Applications
Washington Report
Products
People
Classified Advertising
Advertisers Index
ASHRAE Journal - June 2011 - Intro
ASHRAE Journal - June 2011 - Cover1
ASHRAE Journal - June 2011 - Cover2
ASHRAE Journal - June 2011 - 1
ASHRAE Journal - June 2011 - 2
ASHRAE Journal - June 2011 - Contents
ASHRAE Journal - June 2011 - Commentary
ASHRAE Journal - June 2011 - 5
ASHRAE Journal - June 2011 - Industry News
ASHRAE Journal - June 2011 - 7
ASHRAE Journal - June 2011 - 8
ASHRAE Journal - June 2011 - 9
ASHRAE Journal - June 2011 - 10
ASHRAE Journal - June 2011 - 11
ASHRAE Journal - June 2011 - 12
ASHRAE Journal - June 2011 - 13
ASHRAE Journal - June 2011 - Meetings and Shows
ASHRAE Journal - June 2011 - 15
ASHRAE Journal - June 2011 - Letters
ASHRAE Journal - June 2011 - 16a
ASHRAE Journal - June 2011 - 16b
ASHRAE Journal - June 2011 - 17
ASHRAE Journal - June 2011 - 18
ASHRAE Journal - June 2011 - 19
ASHRAE Journal - June 2011 - 20
ASHRAE Journal - June 2011 - 21
ASHRAE Journal - June 2011 - 22
ASHRAE Journal - June 2011 - 23
ASHRAE Journal - June 2011 - 24
ASHRAE Journal - June 2011 - 25
ASHRAE Journal - June 2011 - Saving Energy in Lab Exhaust Systems
ASHRAE Journal - June 2011 - 27
ASHRAE Journal - June 2011 - 28
ASHRAE Journal - June 2011 - 29
ASHRAE Journal - June 2011 - 30
ASHRAE Journal - June 2011 - 31
ASHRAE Journal - June 2011 - 32
ASHRAE Journal - June 2011 - 33
ASHRAE Journal - June 2011 - 34
ASHRAE Journal - June 2011 - 35
ASHRAE Journal - June 2011 - 36
ASHRAE Journal - June 2011 - 37
ASHRAE Journal - June 2011 - System Effect: To Believe It Is to See It
ASHRAE Journal - June 2011 - 39
ASHRAE Journal - June 2011 - 40
ASHRAE Journal - June 2011 - 41
ASHRAE Journal - June 2011 - What’s New in ASHRAE’s Standard on Comfort
ASHRAE Journal - June 2011 - 43
ASHRAE Journal - June 2011 - 44
ASHRAE Journal - June 2011 - 45
ASHRAE Journal - June 2011 - 46
ASHRAE Journal - June 2011 - 47
ASHRAE Journal - June 2011 - 48
ASHRAE Journal - June 2011 - 49
ASHRAE Journal - June 2011 - On the Path to Net Zero: How Do We Get There From Here?
ASHRAE Journal - June 2011 - 51
ASHRAE Journal - June 2011 - 52
ASHRAE Journal - June 2011 - 53
ASHRAE Journal - June 2011 - 54
ASHRAE Journal - June 2011 - 55
ASHRAE Journal - June 2011 - 56
ASHRAE Journal - June 2011 - 57
ASHRAE Journal - June 2011 - 58
ASHRAE Journal - June 2011 - 59
ASHRAE Journal - June 2011 - 60
ASHRAE Journal - June 2011 - 61
ASHRAE Journal - June 2011 - Walls to Heat, Cool
ASHRAE Journal - June 2011 - 63
ASHRAE Journal - June 2011 - 64
ASHRAE Journal - June 2011 - 65
ASHRAE Journal - June 2011 - 66
ASHRAE Journal - June 2011 - 67
ASHRAE Journal - June 2011 - Building Sciences
ASHRAE Journal - June 2011 - 69
ASHRAE Journal - June 2011 - 70
ASHRAE Journal - June 2011 - 71
ASHRAE Journal - June 2011 - Solar NZEB Project
ASHRAE Journal - June 2011 - 73
ASHRAE Journal - June 2011 - 74
ASHRAE Journal - June 2011 - 75
ASHRAE Journal - June 2011 - 76
ASHRAE Journal - June 2011 - 77
ASHRAE Journal - June 2011 - HVAC Mythbuster
ASHRAE Journal - June 2011 - 79
ASHRAE Journal - June 2011 - 80
ASHRAE Journal - June 2011 - 81
ASHRAE Journal - June 2011 - Emerging Technologies
ASHRAE Journal - June 2011 - 83
ASHRAE Journal - June 2011 - 84
ASHRAE Journal - June 2011 - 85
ASHRAE Journal - June 2011 - IAQ Applications
ASHRAE Journal - June 2011 - 87
ASHRAE Journal - June 2011 - 88
ASHRAE Journal - June 2011 - 89
ASHRAE Journal - June 2011 - Washington Report
ASHRAE Journal - June 2011 - Products
ASHRAE Journal - June 2011 - 92
ASHRAE Journal - June 2011 - People
ASHRAE Journal - June 2011 - Classified Advertising
ASHRAE Journal - June 2011 - 95
ASHRAE Journal - June 2011 - Advertisers Index
ASHRAE Journal - June 2011 - Cover3
ASHRAE Journal - June 2011 - Cover4
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