[Bldg-sim] ASHRAE 90.1 unmet load hours

[Chris Yates]

Hi james
Is it possible to relax your setpoints in proposed and baseline whilst
still meeting A55 requirements?
Would this help?
Chris
On 2 Dec 2011 14:32, "Jim Dirkes" <jim at buildingperformanceteam.com> wrote:

> Dear Forum,
> Feedback requested, please!  I’ve looked at some past posts on this
> general topic and think I am asking about aspects not previously discussed….
> ****
>
> From previous posts and my own understanding:****
>
> **·         **If one or more zones is not meeting its setpoint in a given
> hour, you have 1 unmet load hour.  If 500 zones all fail to meet their
> setpoint in one hour, it’s till one unmet load hour.****
>
> **·         **Add all such hours in a year to obtain your total unmet
> load hours, which cannot exceed 8,760.****
>
> I am now modeling a hotel with:****
>
> **·         **“Massive” wall elements in the lower floors with moderate
> amounts of glass, “lightweight” construction in the upper floors with a lot
> of glass****
>
> **·         **Occupancy schedules that are all over the map for Office,
> Assembly / Meeting Rooms, Kitchen & Restaurant, and Guest Rooms****
>
> **·         **Individual HVAC systems for almost every occupancy type.****
>
> **·         **Presentation to all points of the compass, especially the
> Guest Tower, which is a 16-sided (roughly cylindrical) tower****
>
> This model is making my life very difficult trying to get unmet load hours
> below 300!  As I think about why that is happening, it strikes me that the
> combination of mass, schedules and orientations are spreading the unmet
> loads around to different hours than is normal for many buildings.  Can any
> of you share your thoughts about that perspective?****
>
> Thanks!****
>
> *ASHRAE 90.1-2007*
>
> *unmet load hour: *an hour in which one or more zones is outside of the
> thermostat setpoint range.****
>
> ** **
>
> ** **
>
> [image: Description: Description: BPT BizCard JVDII Updated]****
>
> * *
>
> The real measure of a person’s wealth is how much they’re worth after
> losing all their money.****
>
> ** **
>
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