[Equest-users] Equest-users Digest, Vol 79, Issue 12

Cam Fitzgerald cam at energyopportunities.com
Fri Oct 17 07:16:04 PDT 2014

Good morning, Molly,


Sharad is correct if the system in question is the Baseline HVAC system. With service hot water heaters, there is little guidance for the situation you describe and the modeling methodology is somewhat dependent on how often the back-up natural gas heater will be  needed. If it is a rare occurrence, it would seem reasonable to treat the back-up heater as any other emergency back-up systems and ignore it. If the peak demand for the building is such that the natural gas heat will be required on a regular basis, it would seem reasonable to split the service hot water loads in both models so that the scheduled load on the Proposed heat pump water heater does not exceed the capacity of the proposed unit. In the Baseline case this same load would be met in the baseline case with an electric water heater. All loads that exceed the maximum for the heat pump would then be supplied by a natural gas water heater in both models with the actual thermal efficiency gas water heater in the Proposed case and a natural gas heater with the minimum prescribed performance from Table 7.8. As long as the supporting documentation clearly defines how the loads and schedules for the heat pump and natural gas heaters were determined, it should not be necessary to use the exceptional calculation method. Since this is an unusual strategy, it may be prudent to submit a project specific inquiry to GBCI before you take the time to delineate between the electric and natural gas loads in the models. The first step would be to run the proposed model and identify how often the back-up natural gas heat would be needed.


Hope this helps!


Cam Fitzgerald


Energy Opportunities/a 7group company





From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Sharad Kumar
Sent: Friday, October 17, 2014 3:12 AM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Equest-users Digest, Vol 79, Issue 12


Hi Molly,


As far as Baseline system is concerned , we can choose the system type from table G3.1.1A.

If the heating system for the building is Electric and hybrid, we can chose the system type from the left column (i.e. System-1,3,5,7) from the table G3.1.1A.

Also, if the heating system has to be chosen, it should be considered from the table G3.1.1B. For example for system type-3 the heating system for Baseline Case is fossil fuel furnace.

>From the below given excerpt  from the ASHRAE 90.1, you can refer the Baseline case.

Hence the heating system can be chosen from these tables.

You have to keep in mind the type, area and number of floors of the building.


Inline image 2




Sharad. Kumar

Engineer, LEED-AP

Green Horizon Consulting LLP





On Fri, Oct 17, 2014 at 2:05 AM, <equest-users-request at lists.onebuilding.org> wrote:

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Today's Topics:

   1. Using .INP file to edit schedules, building envelope and
      creating air-side for typical floors (Sharad Kumar)
   2. Appendix G Baseline for a Hybrid Fuel Source DHW  plant
      (Molly Curtz)

---------- Forwarded message ----------
From: Sharad Kumar <sharad.kumar101 at gmail.com>
To: equest-users at lists.onebuilding.org
Date: Thu, 16 Oct 2014 18:16:00 +0530
Subject: [Equest-users] Using .INP file to edit schedules, building envelope and creating air-side for typical floors

Dear eQuest Users, 


Recently while trying few things on .INP file, i have been able to import schedules.

This can be done with the help of File< Import File (to import the text file).This is already there on eQuest users.

I also tried to edit schedules with the help of .INP file.

This can be very useful for building with bigger sizes.

Suppose the default schedule for Occupancy is"E1 Bldg Occup Sch". This can be edited by "find and replace tool" to assign the prior imported schedule (like "Occupancy Schedule Annual" which was imported or created in detailed mode).Hence these schedules can be edited within seconds to reduce the hours of time to seconds. Similarly Lighting, Equipment, Heating, Cooling and HVAC fan schedule can also be edited in .INP file and help to save time.

I used to do all these in eQuest .pd2 file but  this has greatly reduced my efforts.

Similarly typical floors Air-side can be made by similar smart work.

For this we can create One typical floors Air-side and then we can copy then paste then use find and replace tool to create Air-Side for various typical floors.

In this we need to delete the various default systems and zones first belonging to the other typical floors.

Then we can copy,paste and then use "find and replace tool" to edit the number of spaces and zones.

For example, a zone's name is "E20 East Perim Zn (G.E25)" for a system for nineteenth floor and the System'is AHU-20

We can use find and replace tool to edit the number from 20 to 19 to create the Air-side for eighteenth floor. This has to be done for all the spaces belonging to eighteenth floor.

This can also be used to assign the building envelope within minutes to various wall, roof and glass.

I suppose this post can help many people to reduce the time that is invested in the slow processing of eQuest for bigger models.




If you get any error then try few things below:

1. Try to find the error in spacing and lining. This has to be in proper order.

2. Try editing the .INP file section wise.For example the schedule portion, HVAC portion or spaces portion should be edited separately and replaced in the proper .INP file.




Sharad. Kumar 


Green Horizon Consulting LLP







---------- Forwarded message ----------
From: Molly Curtz <molly.curtz at arup.com>
To: "equest-users at lists.onebuilding.org" <equest-users at lists.onebuilding.org>
Date: Thu, 16 Oct 2014 15:53:27 +0000
Subject: [Equest-users] Appendix G Baseline for a Hybrid Fuel Source DHW plant

I'm working on a LEED project where we are considering an air-source heat pump domestic hot water plant with gas boiler backup for low temperatures where the heat pump capacity drops off. Appendix G of ASHRAE 90.1 does not seem to give guidance as to what baseline should be used (gas or electric resistance) for such a hybrid system. Has anyone encountered this before?

Thanks in advance for any suggestions!

Kind regards,





Senior Mechanical Engineer



719 Second Avenue  Suite 400 Seattle WA 98104

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f +1 206 749 0665   

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