ASHRAE Journal - June 2011 - 19
letters
ware and import of information back into the BIM model. Hopefully, the industry consolidation has not been at the expense of healthy competition. Of course, the ASHRAE Headquarters building does present its own challenges in energy modeling since it uses advanced technologies, including a DOAS unit with enthalpy heat recovery, ground source heat pumps and variable flow refrigerant heat pump systems. With any luck, the author will be able to follow-up and come to more positive conclusions. BIM remains a valuable tool in our efforts to achieve a fully integrated design approach for sustainable and energy efficient buildings. Gordon V.R. Holness, Presidential Member/Fellow ASHRAE, Past Chair of BIM Steering Committee, West Palm Beach, Fla. air temperature. The mean radiant temperature usually equals the air temperature in the space, or lower in the spaces with external walls, cold floors or ceilings. The picture is different within the space heated by hydronic heaters (or any other radiant heaters). They significantly increase mean radiant temperature within the space and allow the reduction of drybulb air temperature to achieve the same level of thermal comfort. So, the conclusion is that within the spaces heated by radiant sources (e.g., hydronic heaters) one can feel comfortable with lower air temperature than within the space heated with a gas furnace. Assuming constant moisture content of the air, higher air temperatures mean lower relative hu-
The Author Responds
I couldn’t agree more that BIM will be a valuable tool in our efforts to advance an integrated approach to energy efficient and sustainable building design. However, the tools to fully achieve that ideal still need considerable improvement to meet the needs of most ASHRAE members. We’ll be examining just how far these tools have advanced at our TC 4.1 followup seminar coming up in Montreal. Steven F. Bruning, P.E., Fellow ASHRAE, Atlanta
Do Furnaces Dry Air?
I just read the column HVAC Mythbuster in the March issue about gas furnaces drying out the air. The author has basically concluded that the statement “furnaces dry the air” is completely false. I can’t agree with this statement, and I believe I have a good explanation of the phenomenon. It’s not a myth and has a solid physical background. One of the simplest thermal comfort criteria, operative temperature, takes into consideration local air temperature and mean radiant temperature as two main contributors to the metrics. For low air velocities, the operative temperature is as simple as the average of dry-bulb and mean radiant temperatures. Within the space heated by a gas furnace (or any other air heater), the conditions are pretty much determined by the
www.info.hotims.com/33865-39
June 2011
ASHRAE Journal
19
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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