[Equest-users] Equest-users Digest, Vol 41, Issue 25
anura perera
perera.anura25 at gmail.com
Fri Aug 26 22:51:11 PDT 2011
To: equest-users-request at lists.onebuilding.org,
equest-users at lists.onebuilding.org
Date: Fri, 26 Aug 2011 09:55:13 +0530
Subject: [Equest-users] cooling unmet hour
Dear Kirti,
Yes, Pasha has give you the points to look at.
In addition to what has been mentioned, it can also happens in
intermittently occupied spaces at the beginning of the cooling/heating
schedule in certain zones.
So need to pay attention to all individual thermal zones
Anura
---------- Forwarded message ----------
From: kirti pabrekar <arkirtipabrekar at gmail.com>
s
dear all,
while checking through my simulation reports, i have realized that the the
number of cooling unmet hours for one of my projects is 579 hours. this far
exceeds the tab of allowable 300 hours. can anybody please explain me the
idea behind cooling unmet hours.
any help is greatly appreciated.
thank you
--
Regards,
Ar. Kirti Pramod Pabrekar.
IGBC AP, LEED India,
M. Arch,
Environmental Planning and Design.
2011/8/27 <equest-users-request at lists.onebuilding.org>
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> Today's Topics:
>
> 1. Re: FW: eQuest issues (William Smith)
> 2. LEED EAp1 baseline problem (???)
> 3. Re: LEED EAp1 baseline problem (Jenny Zhang)
> 4. Re: Equest-users Digest, Vol 41, Issue 24 (yashika agarwalla)
> 5. Re: modeling different t-stat allowable float ranges (Nick Caton)
> 6. cooling unmet hours (kirti pabrekar)
> 7. Error in opening file (Mahendra Gooroochurn)
> 8. Modelling of central AHU and fan coil (Mahendra Gooroochurn)
> 9. Re: cooling unmet hours (Pasha Korber-Gonzalez)
> 10. Re: LEED EAp1 baseline problem (???)
> 11. Re: Low Cooling Loads, Big Cooling Electric Consumption
> (Keith Swartz)
> 12. modeling different t-stat allowable float ranges
> (Aaron.Powers at jci.com)
>
>
> ---------- Forwarded message ----------
> From: William Smith <bluestemarchitects at gmail.com>
> To: equest-users at lists.onebuilding.org
> Date: Thu, 25 Aug 2011 16:17:14 -0500
> Subject: Re: [Equest-users] FW: eQuest issues
> I also am getting an error message after testing installation. I am using
> Parallels for Mac. How do I fix this problem?
>
> William
>
>
>
>
>
>
> ---------- Forwarded message ----------
> From: ºÎ×Úº² <tzunghan.ho at gmail.com>
> To: equest-users at lists.onebuilding.org
> Date: Fri, 26 Aug 2011 09:06:30 +0800
> Subject: [Equest-users] LEED EAp1 baseline problem
> Hello All,
>
> I am trying to establish the baseline model for LEED NC 3.0, and have some
> problem as following:
>
> 1. From ASHRAE 90.1 2007 G3.1.2.8, does it mean that I can simulation the
> supply airflow rate by
> setting MIN-SUPPLY-T & DESIGN-COOL-T have 20 degree difference and let
> eQUEST to calculate the
> supply airflow automatically?
> 2. My baseline HVAC is system No.8, VAV with PFP boxes, so from G3.1.3.12,
> the supply air temperature reset must depend on the load, but I can't find
> this setting option in eQUEST, could anybody tell me how to set that?
> 3.Because I am not in a LEED project, could anyone send me the LEED NC3.0
> "EAp2 Section 1.4 table.xls" to check if there is anything I loss?
>
>
> Thanks in advance,
>
>
> Stan Ho
>
>
> ---------- Forwarded message ----------
> From: Jenny Zhang <jenny.zhang at arup.com>
> To: 'ºÎ×Úº²' <tzunghan.ho at gmail.com>, "'equest-users at lists.onebuilding.org'"
> <equest-users at lists.onebuilding.org>
> Date: Fri, 26 Aug 2011 10:36:31 +0800
> Subject: Re: [Equest-users] LEED EAp1 baseline problem
>
> ** **
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *ºÎ×Úº²
> *Sent:* 2011Äê8ÔÂ26ÈÕ 9:07
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] LEED EAp1 baseline problem****
>
> ** **
>
> Hello All,****
>
> ****
>
> I am trying to establish the baseline model for LEED NC 3.0, and have some
> problem as following:****
>
> ****
>
> 1. From ASHRAE 90.1 2007 G3.1.2.8, does it mean that I can simulation the
> supply airflow rate by ****
>
> setting MIN-SUPPLY-T & DESIGN-COOL-T have 20 degree difference and let
> eQUEST to calculate the ****
>
> supply airflow automatically? YES****
>
> 2. My baseline HVAC is system No.8, VAV with PFP boxes, so from G3.1.3.12,
> the supply air temperature reset must depend on the load, but I can't find
> this setting option in eQUEST, could anybody tell me how to set that? you
> could find reset setting options on the ¡®air side
> system¡¯>system>cooling>control and reset.****
>
> 3.Because I am not in a LEED project, could anyone send me the LEED NC3.0
> "EAp2 Section 1.4 table.xls" to check if there is anything I loss? please
> see the attached file, also you could down it on LEED online Credit
> Resource.****
>
> ****
>
> ** **
>
> Thanks in advance, ****
>
> ****
>
> ****
>
> Stan Ho****
> ____________________________________________________________
> Electronic mail messages entering and leaving Arup business
> systems are scanned for acceptability of content and viruses
>
>
> ---------- Forwarded message ----------
> From: yashika agarwalla <aquarianyashika at gmail.com>
> To: equest-users at lists.onebuilding.org
> Date: Fri, 26 Aug 2011 08:17:07 +0530
> Subject: Re: [Equest-users] Equest-users Digest, Vol 41, Issue 24
> Dear All ,
>
> I wanted to know the basic science & working principles behind eQuest
> energy simulation and also woyld be extremely grateful if I could be helped
> with any literature on the same , if any at all.
>
> Rgds,
> Yashika
>
>
>
>
> ---------- Forwarded message ----------
> From: "Nick Caton" <ncaton at smithboucher.com>
> To: "Dana Etherington" <Dana.Etherington at crbusa.com>, <
> equest-users at lists.onebuilding.org>
> Date: Thu, 25 Aug 2011 22:59:42 -0500
> Subject: Re: [Equest-users] modeling different t-stat allowable float
> ranges
>
> Hi Dana,****
>
> ** **
>
> I¡¯d advise opening a space under the system(s) in question, right click and
> read up on the help entries for the following two inputs:****
>
> ** **
>
> ****
>
> ** **
>
> ~Nick****
>
> [image: cid:489575314 at 22072009-0ABB]**
>
> * *
>
> *NICK CATON, P.E.***
>
> SENIOR ENGINEER****
>
> ** **
>
> Smith & Boucher Engineers****
>
> 25501 west valley parkway, suite 200****
>
> olathe, ks 66061****
>
> direct 913.344.0036****
>
> fax 913.345.0617****
>
> www.smithboucher.com* *****
>
> ** **
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Dana
> Etherington
> *Sent:* Thursday, August 25, 2011 3:30 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] modeling different t-stat allowable float ranges
> ****
>
> ** **
>
> We are interested in modeling an ECM where we allow the temperature to
> float between a larger range (70-74 or 70-76) versus a tighter range (say
> 71-73). I would like to compare variations in building energy consumption
> for a few different t-stat ranges. The model itself was built previously, so
> I¡¯m hoping this might just involve changing a couple numbers. Has anyone
> done this? Any input would help. Thanks,****
>
> ** **
>
> -Dana ****
>
> ** **
>
> *Mr. Dana Etherington, E.I.T., LEED AP BD+C *| *CRB *| One Kendall Square
> Ste B2202 | Cambridge, MA 02139****
>
> *Main:* 617-475-3050 *| Direct:* 617-475-3061 | *Mobile:* 617-583-3009 | *
> Fax:* 617-475-3052 | *Ext: 6061*****
>
> *Email:* dana.etherington at crbusa.com | www.crbusa.com****
>
>
> ________________________________________________________________________________________
> ****
>
> ** **
>
> *This document may contain confidential information and is intended for
> use by the addressee only. If you are not *
>
> *the intended recipient, please do not transmit, copy, disclose, or
> utilize this communication in any manner. If you *
>
> *received this message in error, please notify the sender immediately and
> delete this message.*
>
> * *
>
> ¨¹ Please consider the environment before printing this email.****
>
> ** **
>
> ** **
>
>
> ---------- Forwarded message ----------
> From: kirti pabrekar <arkirtipabrekar at gmail.com>
> To: equest-users-request at lists.onebuilding.org,
> equest-users at lists.onebuilding.org
> Date: Fri, 26 Aug 2011 09:55:13 +0530
> Subject: [Equest-users] cooling unmet hours
>
> dear all,
>
> while checking through my simulation reports, i have realized that the the
> number of cooling unmet hours for one of my projects is 579 hours. this far
> exceeds the tab of allowable 300 hours. can anybody please explain me the
> idea behind cooling unmet hours.
>
> any help is greatly appreciated.
>
> thank you
> --
> Regards,
> Ar. Kirti Pramod Pabrekar.
> IGBC AP, LEED India,
> M. Arch,
> Environmental Planning and Design.
>
> *...Green is a commitment...not a competition...*
>
>
>
> ---------- Forwarded message ----------
> From: Mahendra Gooroochurn <m.gooroochurn at gmail.com>
> To: equest-users at lists.onebuilding.org
> Date: Fri, 26 Aug 2011 10:01:22 +0400
> Subject: [Equest-users] Error in opening file
> Hi,
>
> I have a project where I need to simulate a central air handling unit
> feeding the fan coils directly.
> I am using the default air handler in eQuest to supply the fan coil units,
> which works nicely when I configure the model and run the simulation.
> But when I close the project and open it again, it would cause eQuest to
> crash with the following message:
>
> " V1 = (0,0) V2 = (100,0) V3 = (100,100) V4 = (0,100) ..
>
> MIN-FLOW-RATIO in default zone has expression evaluation error: Invalid BDL
> Table Indexes."
>
> Anybody got this type of error message. Grateful if somebody can help me
> out.
>
> Regards,
> Kishan
>
>
> ---------- Forwarded message ----------
> From: Mahendra Gooroochurn <m.gooroochurn at gmail.com>
> To: equest-users at lists.onebuilding.org
> Date: Fri, 26 Aug 2011 11:10:22 +0400
> Subject: [Equest-users] Modelling of central AHU and fan coil
> Hi,
>
> Any of you have modelled a central AHU system which delivers fresh air to
> fan coil units.
> Can you please describe how to go about setting the systems.
>
> Thanks,
> Kishan
>
>
>
> ---------- Forwarded message ----------
> From: Pasha Korber-Gonzalez <pasha.pkconsulting at gmail.com>
> To: kirti pabrekar <arkirtipabrekar at gmail.com>
> Date: Fri, 26 Aug 2011 02:18:09 -0600
> Subject: Re: [Equest-users] cooling unmet hours
> Hi Kirti,
>
> essentially, the rooms that are asking for cooling energy are not getting
> it for some reason...this is the reason (or input) that you need to find to
> be the culprit of not providing enough energy or not letting the cooling
> energy get to the spaces that are asking for cooling.
>
> Start by going to the SS-R reports after you see the unmet hours in your
> BEPS/BEPU reports. Find which zones/systems are the culprit of the issue.
> Next go to the SS-F reports for each zone that is being undercooled and this
> will help you determine what also might be happening.
>
> Hope this is a start to getting you the info you are looking for.
>
> Cheers,
> Pasha
>
> On Thu, Aug 25, 2011 at 10:25 PM, kirti pabrekar <
> arkirtipabrekar at gmail.com> wrote:
>
>>
>> dear all,
>>
>> while checking through my simulation reports, i have realized that the the
>> number of cooling unmet hours for one of my projects is 579 hours. this far
>> exceeds the tab of allowable 300 hours. can anybody please explain me the
>> idea behind cooling unmet hours.
>>
>> any help is greatly appreciated.
>>
>> thank you
>> --
>> Regards,
>> Ar. Kirti Pramod Pabrekar.
>> IGBC AP, LEED India,
>> M. Arch,
>> Environmental Planning and Design.
>>
>> *...Green is a commitment...not a competition...*
>>
>>
>> _______________________________________________
>> Equest-users mailing list
>> http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
>> To unsubscribe from this mailing list send a blank message to
>> EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG
>>
>>
>
>
> ---------- Forwarded message ----------
> From: ºÎ×Úº² <tzunghan.ho at gmail.com>
> To: Jenny Zhang <jenny.zhang at arup.com>
> Date: Fri, 26 Aug 2011 18:28:24 +0800
> Subject: Re: [Equest-users] LEED EAp1 baseline problem
> Thank you, Jenny, your advise is really helpful.
>
> But I still can't solve the question 3.
>
> ASHRAE 90.7 2007, G3.1.3.12: The air temperature for cooling shall be reset
> highter by 5 under the minimum cooling load conditions.
>
> My question is: I can reset the temperature depend on outside temperature
> or inside temperature, but I don't know how to reset temperature depend on
> "load".
>
> Thank you for your help!
>
> Jenny Zhang <jenny.zhang at arup.com> ì¶ 2011Äê8ÔÂ26ÈÕÉÏÎç10:36 Œ‘µÀ£º
>
>> ** **
>>
>> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
>> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *ºÎ×Úº²
>> *Sent:* 2011Äê8ÔÂ26ÈÕ 9:07
>> *To:* equest-users at lists.onebuilding.org
>> *Subject:* [Equest-users] LEED EAp1 baseline problem****
>>
>> ** **
>>
>> Hello All,****
>>
>> ****
>>
>> I am trying to establish the baseline model for LEED NC 3.0, and have some
>> problem as following:****
>>
>> ****
>>
>> 1. From ASHRAE 90.1 2007 G3.1.2.8, does it mean that I can simulation the
>> supply airflow rate by ****
>>
>> setting MIN-SUPPLY-T & DESIGN-COOL-T have 20 degree difference and let
>> eQUEST to calculate the ****
>>
>> supply airflow automatically? YES****
>>
>> 2. My baseline HVAC is system No.8, VAV with PFP boxes, so from G3.1.3.12,
>> the supply air temperature reset must depend on the load, but I can't find
>> this setting option in eQUEST, could anybody tell me how to set that? you
>> could find reset setting options on the ¡®air side
>> system¡¯>system>cooling>control and reset.****
>>
>> 3.Because I am not in a LEED project, could anyone send me the LEED NC3.0
>> "EAp2 Section 1.4 table.xls" to check if there is anything I loss? please
>> see the attached file, also you could down it on LEED online Credit
>> Resource.****
>>
>> ****
>>
>> ** **
>>
>> Thanks in advance, ****
>>
>> ****
>>
>> ****
>>
>> Stan Ho****
>> ____________________________________________________________
>> Electronic mail messages entering and leaving Arup business
>> systems are scanned for acceptability of content and viruses
>>
>
>
>
> ---------- Forwarded message ----------
> From: Keith Swartz <kswartz at ecw.org>
> To: "steinvor at msu.edu" <steinvor at msu.edu>, "
> equest-users at lists.onebuilding.org" <equest-users at lists.onebuilding.org>
> Date: Fri, 26 Aug 2011 08:51:45 -0500
> Subject: Re: [Equest-users] Low Cooling Loads, Big Cooling Electric
> Consumption
>
> Federico,****
>
> ** **
>
> Does the proposed building have more insulation and does the building have
> a fair amount of internal heat gains? Adding insulation to a building with
> even a moderate amount of internal loads can cause a net annual energy
> penalty, even though summer and winter peak loads are reduced. The effect is
> more pronounced if the HVAC system does not have an economizer. Search the
> archives for a more complete explanation.****
>
> ** **
>
> ________________________________****
>
> **Keith Swartz**, P.E., LEED AP****
>
>
> Energy Engineer / Senior Project Manager
> *Energy Center of Wisconsin
> *****455 Science Drive, Suite 200, ********Madison**, **WI** **53711
> ****Phone: 608.238.8276 x123
> Fax: 608.238.0523
>
> *The Buildings Team*****
>
> *Design decisions through energy, economics and emissions analysis.*****
>
> www.ecw.org/Buildings ****
>
>
> *Energy Center University
> **Your gateway to sustainable design training and online education
> programs.
> *www.ecw.org/university/****
>
> *From:* steinvor at msu.edu [mailto:steinvor at msu.edu]
> *Sent:* Thursday, August 25, 2011 12:09 AM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Low Cooling Loads, Big Cooling Electric
> Consumption****
>
> ** **
>
> Hello All:
>
> In a recent project, my model doesn't have a designed HVAC system, so I'm
> modeling my proposed the same as the baseline. Baseline system is #8
> (chilled water) with FPF's, climate zone 1. Even though I'm getting lower
> cooling loads for the proposed building, the electric load corresponding to
> cooling the building is higher than the baseline. Fans and pumps consumption
> is increasing this value. What can be causing this, how can this value be
> reduced?
>
> Thanks!****
>
> Federico ****
>
>
> ---------- Forwarded message ----------
> From: Aaron.Powers at jci.com
> To: equest-users at lists.onebuilding.org
> Date: Fri, 26 Aug 2011 09:19:03 -0500
> Subject: [Equest-users] modeling different t-stat allowable float ranges
>
> Hi Dana,
>
> Is your t-stat range a cooling or heating range? If your system involves
> both heating and cooling, you will need a setpoint temperature for both.
> Other than unitary systems, your heating and cooling setpoints cannot be
> the same because the t-stat will tell its controllers that it both needs to
> heat and cool to reach setpoint. In eQuest, I believe the defaults are
> around 68 F for heating and 74 F for cooling, which is typical for new
> systems.
>
> As far as letting the temperature float, there are a couple of ways to do
> this:
> 1.
> Setpoints can be scheduled with a BAS. Usually, this includes an occupied
> setpoint and an unoccupied setpoint setback. For example, a 74 F occupied
> cooling setpoint and an 82 F cooling setpoint setback after 7 pm. In
> eQUEST, this can be done by editing the thermostat schedules. I'm guessing
> this is not what you're looking for, but I'm throwing it out there just in
> case :)
> 2.
> Most HVAC controllers are proportional (P) controllers, which means that
> they control the HVAC equipment in a proportional response to the difference
> between the sensed temperature and the setpoint. An inherent property of
> proportional controllers is that they cannot hit their setpoint exactly, but
> there will be some offset. How much this offset is depends on the gain of
> the controller when it is programmed by a technician. There is usually a
> trade-off between offset and response time. In eQUEST, the offset is called
> "Throttling Range" and is accessible in the Basic Specifications Tab of the
> Zones dialog. So, a t-stat can be programmed to have a greater offset or
> throttling range and the temperature will float more around each setpoint.
> For example, if you increase the throttling range to 4 R in eQUEST with a
> cooling setpoint of 74 F, the thermostat will signal 100% response at 76 F
> and 0 response at 72 F. This will result in an air temperature which floats
> more than a system with a throttling range of 2 R. You may see building
> occupants complain more about inconsistent temperatures with an offset of 4
> R vs 2 R. Higher end facilities will sometimes be equipped with a
> proportional-integral-differential (PID) thermostat, which eliminates the
> offset of the proportional controller. To model a PID controller in eQUEST,
> you simply reduce the throttling range to a minimal value.
>
> Keep in mind too that when doing a simulation like this, eQUEST is an
> hourly steady-state simulation engine with the ability to approximate some
> transience. In reality, HVAC controllers sample at a much faster rate than
> once per hour, and their response times are much greater than instantaneous.
> Also, unfortunately, you cannot use this as an ECM for LEED as they require
> equivalent t-stat setpoints in baseline and proposed cases. Good luck!
> *Aaron Powers* *Johnson Controls | Building Efficiency* Energy
> Solutions Engineer 6935 Appling Farms Pkwy # 112, Memphis, TN 38133 901
> 359 4255 *aaron.powers at jci.com* <aaron.powers at jci.com>
>
> We are interested in modeling an ECM where we allow the temperature to
> float between a larger range (70-74 or 70-76) versus a tighter range (say
> 71-73). I would like to compare variations in building energy consumption
> for a few different t-stat ranges. The model itself was built previously, so
> I¡¯m hoping this might just involve changing a couple numbers. Has anyone
> done this? Any input would help. Thanks,
>
> -Dana
>
> *Mr. Dana Etherington, E.I.T., LEED AP BD+C *| *CRB *| One Kendall Square
> Ste B2202 | Cambridge, MA 02139
> *Main:* 617-475-3050 *| Direct:* 617-475-3061 | *Mobile:* 617-583-3009 | *
> Fax:* 617-475-3052 | *Ext: 6061*
> *Email:* *dana.etherington at crbusa.com* <dana.etherington at crbusa.com> | *
> www.crbusa.com* <http://www.crbusa.com/>
>
> ________________________________________________________________________________________
>
> *This document may contain confidential information and is intended for
> use by the addressee only. If you are not *
> *the intended recipient, please do not transmit, copy, disclose, or
> utilize this communication in any manner. If you *
> *received this message in error, please notify the sender immediately and
> delete this message.*
> * *
> ¨¹ Please consider the environment before printing this email.
>
> _______________________________________________
>
> _______________________________________________
> Equest-users mailing list
> Equest-users at lists.onebuilding.org
> http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
>
>
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