[BLDG-SIM] OA Loads
Tianzhen Hong
thong at archenergy.com
Wed Jul 25 10:25:17 PDT 2007
Neither 2.1E nor 2.2 reports OA loads separately. What I have done in the past is to make two runs: one with OA, the other with no OA by setting OA to zero or a very small number (be careful about the economizer), then compare the results to get OA loads and other impacts.
EnergyPlus does have an OA report.
Tianzhen
From: postman at gard.com
Sent: Wed, 7/25/2007 1:02am
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] BLDG-SIM at GARD.COM message digest 07/25/2007 03:01 (#2007-976)
BLDG-SIM at GARD.COM message digest 07/25/2007 03:01 (#2007-976)
7 messages included in this issue
1eQuest Outside Air Load Reportmichael.tillou at gmail.com
2Question About Equest - Space Peak Load Calculationsmprince at aeieng.com
3Question About Equest - Space Peak Load Calculationsmichael.tillou at gmail.com
4Question About Equest - Space Peak Load Calculationsandrew_c at ieice.com
5Gas Fireplacecj at cr-jay.ca
6Energy use for elevatorstianzhen9 at yahoo.com
7Energy use for elevatorsgmehta75 at gmail.com
Date: Tue, 24 Jul 2007 10:30:19 -0400
From: "Michael Tillou" <michael.tillou at gmail.com>
Subject: RE: eQuest Outside Air Load Report
Brandon,
I agree that there needs to be better reporting of OA loads in equest. OA
loads only show up in the system reports so you would have to subtract the
building loads from the load reports to get an approximation of the hourly
OA loads. Notice I said approximation. The system reports also include
pipe and duct losses, pump & fan heat and any other system level effects on
your heating/cooling. The best way I have found to check outside air is to
use the hourly reports. Remember you can set the hourly report output to a
format that can be easily opened in Excel if you need to do any additional
calculations.
Mike
Michael Tillou, PE, LEED
P: 413-458-9870 C: 413-652-1087
_____
From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Brandon
Nichols
Sent: Monday, July 23, 2007 7:46 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] eQuest Outside Air Load Report
Thanks to all for answers to previous question,
Here's one more... I think it has been asked before although I
Google-scanned the archives could not seem to find it. Namely, where is the
eQuest outside air load reported? I see lots disclaimers for "The above
loads do not include outside air ventilation loads", but no outside air load
ventilation summary.
Do I really have to take a differential between the total load and all other
loads to back-into an outside air load for each space and system? There's
needs to be a better way...!
Thanks in advance,
Brandon Nichols, PE
Mechanical
HARGIS ENGINEERS
600 Stewart Street
Suite 1000
Seattle, WA 98101
www.hargis.biz
d | 206.436.0400 c | 206.228.8707
o | 206.448.3376 f | 206.448.4450
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Date: Tue, 24 Jul 2007 12:04:23 -0500
From: "Mark Prince" <mprince at aeieng.com>
Subject: Question About Equest - Space Peak Load Calculations
I have a question about how Equest calculates the space peak load =
calculation.
For all of my internal heat gains (people, lights, equipment) I have =
schedules. When you create a schedule, it not only asks for utilization =
for Sunday through Saturday, but it also asks for a schedule for Design =
Cooling and schedule for Design Heating. I assume that the Design Cooling =
Schedule/Design Heating Schedule is used by Equest to calculate the peak =
cooling and heating load for the space.
For instance, lets say I have a laboratory with 8 watts/square foot of =
equipment load. From an energy standpoint, this equipment load really =
never gets higher than 50% throughout the year. So I create my Sunday =
through Saturday schedules with a peak utilization of 0.5000. However, =
there will be sometimes where 8 watts/square foot will be generated in the =
laboratory, and I need to size my zone supply airflow for this 8 watts/squa=
re foot. Therefore, I create my design cooling schedule to require a peak =
utilization of 1.000. However, when I run the simulation and go to the =
"LS-B Space Peak Load Component" report the peak cooling load is using the =
50% diversified load. Why is this happening? Shouldn't Equest be using =
the Design Cooling schedule which has a peak utilization of 1.000 all the =
time?
Sincerely,
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Date: Tue, 24 Jul 2007 13:35:08 -0400
From: "Michael Tillou" <michael.tillou at gmail.com>
Subject: RE: Question About Equest - Space Peak Load Calculations
Before equest will use the Design Day information in the schedules you need
to setup actual design days for the simulation to use.
You need to do this in the detailed edit under the Project & Site tab. You
need to create both a heating and cooling design day and then input the
desired temperature extremes and duration that you wish to simulate.
Reference the climate design data in the ASHRAE Fundamentals Handbook for
your location. Once you create the design days equest will use them for
equipment sizing rather than the peak heating & cooling loads calculated
from the TMY weather data.
Mike
Michael Tillou, PE, LEED
P: 413-458-9870 C: 413-652-1087
-----Original Message-----
From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Mark Prince
Sent: Tuesday, July 24, 2007 1:04 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Question About Equest - Space Peak Load Calculations
I have a question about how Equest calculates the space peak load
calculation.
For all of my internal heat gains (people, lights, equipment) I have
schedules. When you create a schedule, it not only asks for utilization for
Sunday through Saturday, but it also asks for a schedule for Design Cooling
and schedule for Design Heating. I assume that the Design Cooling
Schedule/Design Heating Schedule is used by Equest to calculate the peak
cooling and heating load for the space.
For instance, lets say I have a laboratory with 8 watts/square foot of
equipment load. From an energy standpoint, this equipment load really never
gets higher than 50% throughout the year. So I create my Sunday through
Saturday schedules with a peak utilization of 0.5000. However, there will
be sometimes where 8 watts/square foot will be generated in the laboratory,
and I need to size my zone supply airflow for this 8 watts/square foot.
Therefore, I create my design cooling schedule to require a peak utilization
of 1.000. However, when I run the simulation and go to the "LS-B Space Peak
Load Component" report the peak cooling load is using the 50% diversified
load. Why is this happening? Shouldn't Equest be using the Design Cooling
schedule which has a peak utilization of 1.000 all the time?
Sincerely,
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Date: Tue, 24 Jul 2007 10:45:08 -0700
From: "Andrew Craig" <andrew_c at ieice.com>
Subject: RE: Question About Equest - Space Peak Load Calculations
I'll also add that when you simulate a building using a California
climate zone, it automatically creates a Design Day report along with
the standard reports. This is a nice feature that seems to only be
incorporated with the CZ climate zones.
Andrew Craig, EIT, LEED(r) AP | Mechanical Designer
INTERFACE ENGINEERING=20
708 SW Third Avenue | Suite 400 | Portland, OR 97204=20
direct: 503.382.2696
office: 503.382.2266
fax: 503.382.2262
email: Andrew_C at ieice.com
web: www.ieice.com=20
Consultants of Choice to the Built Environment for over 35 years
Kirkland, WA | Portland, OR | Sacramento, CA | Salem, OR | SanFrancisco,
CA
-----Original Message-----
From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Michael
Tillou
Sent: Tuesday, July 24, 2007 10:35 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Question About Equest - Space Peak Load Calculations
Before equest will use the Design Day information in the schedules you
need
to setup actual design days for the simulation to use.
You need to do this in the detailed edit under the Project & Site tab.
You
need to create both a heating and cooling design day and then input the
desired temperature extremes and duration that you wish to simulate.
Reference the climate design data in the ASHRAE Fundamentals Handbook
for
your location. Once you create the design days equest will use them for
equipment sizing rather than the peak heating & cooling loads calculated
from the TMY weather data.
Mike
Michael Tillou, PE, LEED
P: 413-458-9870 C: 413-652-1087
-----Original Message-----
From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Mark
Prince
Sent: Tuesday, July 24, 2007 1:04 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Question About Equest - Space Peak Load Calculations
I have a question about how Equest calculates the space peak load
calculation.
For all of my internal heat gains (people, lights, equipment) I have
schedules. When you create a schedule, it not only asks for utilization
for
Sunday through Saturday, but it also asks for a schedule for Design
Cooling
and schedule for Design Heating. I assume that the Design Cooling
Schedule/Design Heating Schedule is used by Equest to calculate the peak
cooling and heating load for the space.
For instance, lets say I have a laboratory with 8 watts/square foot of
equipment load. From an energy standpoint, this equipment load really
never
gets higher than 50% throughout the year. So I create my Sunday through
Saturday schedules with a peak utilization of 0.5000. However, there
will
be sometimes where 8 watts/square foot will be generated in the
laboratory,
and I need to size my zone supply airflow for this 8 watts/square foot.
Therefore, I create my design cooling schedule to require a peak
utilization
of 1.000. However, when I run the simulation and go to the "LS-B Space
Peak
Load Component" report the peak cooling load is using the 50%
diversified
load. Why is this happening? Shouldn't Equest be using the Design
Cooling
schedule which has a peak utilization of 1.000 all the time?
Sincerely,
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Date: Tue, 24 Jul 2007 17:10:04 -0400
From: Chris Jones <cj at cr-jay.ca>
Subject: Re: Gas Fireplace
The tricky thing is the schedule of fireplace use. Then you need to
determine how much heat is transferred into the space versus how much
goes up the chimney. Then define a process load and schedule. Set
the sensible gain appropriately. In the zone you need to define an
exhaust fan, fan power and schedule to match the source use schedule.
At 17:24 2007-07-05, you wrote:
>Hello Analyst/Engineers,
>
>Need input on how to model fireplace and the dedicated exhaust fan.
>It is 300,000Btu/h gas fire place that is used for esthetical only.
>All heat is being exhausted through the chimney with 3200cfm VSD exhaust fan.
> * Can somebody point me how to model this in eQuest?
> * Since it is not used for heating purposes, I assume it should
> be modeled both for baseline and proposed model?
>Any input is greatly appreciated.
>Thanks
>
>Virdiansyah "Virdi" Permana
>EMSI
>Energy Analyst
>(202) 291 3102 T
>(202) 291 3107 F
>
>
>
>
>
>You received this e-mail because you are subscribed
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Chris Jones, P.Eng.
14 Oneida Avenue
Toronto, ON M5J2E3
Tel. 416 203-7465
Fax. 416 946-1005
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Date: Tue, 24 Jul 2007 19:55:33 -0700 (PDT)
From: Zhen Tian <tianzhen9 at yahoo.com>
Subject: RE: Energy use for elevators
Eric,
Thanks a lot for your reply.
I have a further question. If we have the elevator power data, what appropriate schedule should we use to approximately to get the elevator annual energy use?
I checked the ASHREAE Appendix G but cannot find appropriate schedule for elevators.
I think the schedule of elevators are quite diffent from other schedules like occupancy scheule. One example, supposing people work from 8am to 6pm continuously, I guess that elevator working schedule should not be the same. Do you have any ideas what appropriate schedule should we use?
Thanks a lot.
Regards,
David
Eric Yang wrote:
Yes, ASHRAE 90.1 Appendix G requires modeling elevator energy as long as it is designed in the project. You can come up a realistic schedule or stick to a standard schedule in Appendix G if necessary.
Eric
Smithgroup
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Date: Tue, 24 Jul 2007 21:59:58 -0700
From: "Gaurav Mehta" <gmehta75 at gmail.com>
Subject: Re: Energy use for elevators
David,
Table G-E to G-N in the User Manual for ASHRAE 90.1-2004 provides the =
default schedules (occupancy, lighting, HVAC, DHW and Elevator) which =
can be used for Appendix G analysis if the actual schedules are not =
known.
Moreover, if you are using eQuest then in the detail mode go to daily =
schedules and right click and select 'create daily schedules' and in the =
pop-up window click on 'Load Component from Library'. Form the drop down =
menu in the 'Category' select 'Elevator Schd' and from drop down menu in =
the 'Entry' select the appropriate schedule. And then go on to make =
weekly and annual schedules.=20
I have not made a comparison, but they might be a bit different from the =
schedules provided in the User Manual.=20
Furthermore, you can assign the elevator power data (in kW) directly to =
the Electric Meter using the 'Interior Direct Loads' tab and then =
selecting the elevator schedule from the drop down menu. This enduse can =
be assigned to Misc Equipment and will show up in addition to the plug =
loads in the BEPU and BEPS report. =20
Best regards,
Gaurav Mehta
Sustainable Building Analyst
Stantec
----- Original Message -----=20
From: Zhen Tian=20
To: BLDG-SIM at gard.com=20
Cc: BLDG-SIM at gard.com=20
Sent: Tuesday, July 24, 2007 19:55
Subject: [BLDG-SIM] Energy use for elevators
Eric,
Thanks a lot for your reply.
I have a further question. If we have the elevator power data, what =
appropriate schedule should we use to approximately to get the elevator =
annual energy use?
I checked the ASHREAE Appendix G but cannot find appropriate schedule =
for elevators.
I think the schedule of elevators are quite diffent from other =
schedules like occupancy scheule. One example, supposing people work =
from 8am to 6pm continuously, I guess that elevator working schedule =
should not be the same. Do you have any ideas what appropriate schedule =
should we use?
Thanks a lot.
Regards,
David=20
Eric Yang wrote:
Yes, ASHRAE 90.1 Appendix G requires modeling elevator energy as =
long as it is designed in the project. You can come up a realistic =
schedule or stick to a standard schedule in Appendix G if necessary.=20
Eric
Smithgroup
-----Original Message-----
From: BLDG-SIM at gard.com on behalf of Zhen Tian
Sent: Mon 7/23/2007 10:36 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Energy use for elevators
Dear All,
I have seen some messages these days asking the energy use of =
elevators. But it seems that there is no very accurate way of modeling =
annual lift energy use.
If we need to simulate building energy use according to ASHRAE =
90.1-2004 for LEED accrediation in e-QUEST, do we need to simulate =
elevator energy use or not? Is it a must do? Could somebody with =
experience with this topic give me some hints?
Thanks a lot in advance.
Regards,
David
---------------------------------
Take the Internet to Go: Yahoo!Go puts the Internet in your pocket: =
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