Miroslav,
I think that making the cooling setpoint high (e.g., 30C) is not sneaky. The approach recognizes the actual situation and provides a realistic comparison between the two systems.
I am pretty sure that modelers other than I have used this approach and I think I have seen a LEED CIR on the topic which indicates it’s OK. I do not know the intentions of ASHRAE’s 90.1 authors.
p.s. Nothing I say above is definitive – it’s opinion. Defensible and realistic, but opinion nonetheless. The authors of 90.1 did a very good job, but I have never seen or heard an explanation of this particular requirement.
The Building Performance Team
James V. Dirkes II, P.E., BEMP , LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Marcus
Sent: Sunday, May 06, 2012 12:29 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] ASHRAE 90.1 G3.1.1
Hi Miroslav,
Yes, now I see your dilemma! I have never experienced this, but have some thoughts;
One overriding concern is the number of unmet hours. If you have no cooling system in your proposed design, do you still meet G3.1.2.2 unmet hours? If you do, you can argue that your proposed design for whatever reason does in fact not require any cooling. And it follows that you can model the proposed system and
Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe
__,_._,___