[Equest-users] HVAC description - HVAC Summary file
Nicholas Caton via Equest-users
equest-users at lists.onebuilding.org
Tue Dec 6 08:39:02 PST 2016
For the first two cases, utilizing system type ‘HP’ (one of the zonal systems), you are observing one system sized to 9 tons, and another sized to 4 tons.
· There is indeed rounding in those tonnage numbers – you can looks to the system summary (SV-A) reports for extra resolution, or for an approximation perform a bit algebra using the btuh/sf alongside the associated area listed here.
· The total non-concurrent capacity between these two systems is 13 tons. The peak cooling draw between the two is likely less if they have different load profiles. 6.5 is the averaged capacity between the two.
For the third case,
· Per above, air-side summary reports do perform a degree of rounding for tonnage numbers.
· Before concluding this space has effectively zero cooling needs, or that the system needs zero cooling capacity, I observe a few things that would give me pause:
o The report is telling you that for a substantial chunk of the year, cooling needs (as defined by the thermostat schedule assigned to that zone) are NOT being met (800+ hours)
o The system is being auto-sized (presumably) to only 25 CFM. Unless you’re aiming for a very small exhaust fan you are probably pushing more air in reality. Manually entering something larger will probably be a helpful step towards resolving the unmet hours.
o Looks like a very small IT closet per the description & area. A little bit odd that you have a system dedicated to that space but are also delivering outside air... probably not enough space in that 40 ft2 to hold a person that would need the ventilation air for code.
I hope that helps clarify!
~Nick
[cid:image001.png at 01D24FAA.B192ACA0]
Nick Caton, P.E., BEMP
Senior Energy Engineer
Energy and Sustainability Services
Schneider Electric
D 913.564.6361
M 785.410.3317
E nicholas.caton at schneider-electric.com<mailto:nicholas.caton at schneider-electric.com>
F 913.564.6380
15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States
[cid:image001.png at 01D189AB.58634A10]
From: Fakeha Sehar [mailto:fakeha_s at yahoo.com]
Sent: Monday, December 05, 2016 8:18 PM
To: Nicholas Caton <Nicholas.Caton at schneider-electric.com>
Subject: Re: [Equest-users] HVAC description - HVAC Summary file
so if I have HVAC system defined for two spaces as below, the total HVAC capacity is (9+4)/2=6.5? How will the heating capacity be defined?
Type*
Design Flow
Design Ventilation
Design Capacity
Hrs Outside
Thrl-Range
System & Zone Name
System Type
Principal Zone Activity
Ret
Zn
Area
sqft
Supply
cfm
Supply
cfm/sf
Min
Flow
OSA
cfm
OSA
%
OSA
cfm/sf
OSA
cfm/per
Cool
tons
Cool
sf/ton
Cool
cfm/ton
Cool
Btuh/sf
Heat
Btuh/sf
Cool
Hrs
Heat
Hrs
VSys3 (HP) (G.WNW20)T
Water Loop HP
D
1,283
1,831
1.43
100%
1,831
100%
1.428
299.0
9
138
198
86.7
102.1
6
0
··· VWNW Perim Zn (G.WNW20)T
Auto Repair Workshop (95%)
C
1,283
1,831
1.43
100%
1,831
100%
1.428
299.0
9
138
198
86.7
102.1
6
0
··· VWNW Perim Pl Zn (G.WNW29)T
(unknown)
U
1,283
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
Sum of Zones
··
··
··
1,831
··
··
··
··
··
··
9
··
··
··
··
0%
0%
Sum of Zones / System Total
··
··
··
100%
··
··
··
··
··
··
100%
··
··
··
··
··
··
Type*
Design Flow
Design Ventilation
Design Capacity
Hrs Outside
Thrl-Range
System & Zone Name
System Type
Principal Zone Activity
Ret
Zn
Area
sqft
Supply
cfm
Supply
cfm/sf
Min
Flow
OSA
cfm
OSA
%
OSA
cfm/sf
OSA
cfm/per
Cool
tons
Cool
sf/ton
Cool
cfm/ton
Cool
Btuh/sf
Heat
Btuh/sf
Cool
Hrs
Heat
Hrs
VSys3 (HP) (G.N27)T
Water Loop HP
D
509
726
1.43
100%
726
100%
1.428
299.0
4
138
198
86.7
102.1
0
0
··· VNorth Perim Zn (G.N27)T
Auto Repair Workshop (95%)
C
509
726
1.43
100%
726
100%
1.428
299.0
4
138
198
86.7
102.1
0
0
··· VNorth Perim Pl Zn (G.N36)T
(unknown)
U
509
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
Sum of Zones
··
··
··
726
··
··
··
··
··
··
4
··
··
··
··
0%
0%
Sum of Zones / System Total
··
··
··
100%
··
··
··
··
··
··
100%
··
··
··
··
··
··
for the below zone, i guess the software doesnot show values lower than 1, as this AC has 0.06 (40/589) ton capacity.
Type*
Design Flow
Design Ventilation
Design Capacity
Hrs Outside
Thrl-Range
System & Zone Name
System Type
Principal Zone Activity
Ret
Zn
Area
sqft
Supply
cfm
Supply
cfm/sf
Min
Flow
OSA
cfm
OSA
%
OSA
cfm/sf
OSA
cfm/per
Cool
tons
Cool
sf/ton
Cool
cfm/ton
Cool
Btuh/sf
Heat
Btuh/sf
Cool
Hrs
Heat
Hrs
VSys11 (PSZ) (M.C41)T
Pkgd Single Zone
D
40
25
0.62
100%
4
16%
0.100
20.0
0
589
366
20.4
0.8
812
0
··· VCore Zn (M.C41)T
Computer (Mainframe/Srvr)
C
40
25
0.62
100%
4
16%
0.100
20.0
0
589
366
20.4
0.8
812
0
··· VCore Pl Zn (M.C50)T
(unknown)
U
40
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
Sum of Zones
··
··
··
25
··
··
··
··
··
··
0
··
··
··
··
17%
0%
Sum of Zones / System Total
··
··
··
100%
··
··
··
··
··
··
100%
··
··
··
··
··
··
On Monday, December 5, 2016 1:58 PM, Nicholas Caton <Nicholas.Caton at schneider-electric.com<mailto:Nicholas.Caton at schneider-electric.com>> wrote:
Hello Fakeha,
In addition to Bill’s suggestion to consider the HVAC Summary CSV output, here are a few options “out of the box” which may address your query. 2 major options (following a simulation run), and 1 over-arching caution:
1. Air-side HVAC tab, highlight the system in question in the component tree, then click the “Summary” tab to review SYSTEM and ZONE capacities. Alternatively highlight the “Project” line at the top of the component tree to review each system in succession.
2. Look to the SV-A reports in the SIM output file
Caution: If you are seeing zeroes for the system cooling/heating capacity in the SV-A reports, there’s a good chance you’re looking at one of the inherently zonal system types, such as PTAC or FC. Be mindful that irrespective of how many of those SYSTEMS you have defined for the model, they actually exist on a per-zone basis when trying to summarize capacities.
For example: if I have a PTAC system assigned to 10 conditioned zones, and the resulting airside summary tab suggests I have 60 tons for that “system,” that really means the typical PTAC averages ~6 tons (and would normally be expected to vary around that figure). If auto-sized, those capacities are respective design conditions for each respective zone, and do not in sum necessarily represent the aggregate peak cooling demand for the building.
If “zonal system types” is alone cause for a head-scratch, advising further reading in/around Volume 1: Basics > Air-side Components > Introduction > Another Way of Classifying Air Systems > Zonal vs. Central Systems.
Hope this helps!
~Nick
[cid:image001.png at 01D24FAA.B192ACA0]
Nick Caton, P.E., BEMP
Senior Energy Engineer
Energy and Sustainability Services
Schneider Electric
D 913.564.6361
M 785.410.3317
E nicholas.caton at schneider-electric.com<mailto:nicholas.caton at schneider-electric.com>
F 913.564.6380
15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States
[cid:image001.png at 01D189AB.58634A10]
From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Bishop, Bill via Equest-users
Sent: Monday, December 05, 2016 12:48 PM
To: Fakeha Sehar <fakeha_s at yahoo.com<mailto:fakeha_s at yahoo.com>>
Cc: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] HVAC description - HVAC Summary file
Hi Fakeha,
The HVAC Summary file may have what you are looking for. See my previous post, inserted below, if this file is not currently generated by your eQUEST installation.
Regards,
~Bill
eQUEST can generate a handy HVAC Summary file (.csv) automatically when you simulate. You have to open the “eQUEST.INI” file and insert the line, “StoreResults_HVAC_Summary=1” as shown in the screen shot below. The eQUEST.INI file is in the eQUEST Data directory, in both 3.65 and 3.64, which can be found in Tools -> View File Locations -> View eQUEST Data Directory. Once you modify, and save the eQUEST.INI file, there will be a “YOUR_PROJECT_NAME – HVAC Summary.csv” file in the project folder after you open and simulate your project. I mostly use the Air-Side System Summaries portion of the file to help with automating fan power and EIR calculations for Baseline models.
[cid:image003.jpg at 01D24FAA.B192ACA0]
Regards,
Bill
William Bishop, PE, BEMP, BEAP, CEM, LEED AP | Pathfinder Engineers & Architects LLP
Senior Energy Engineer
[cid:image004.jpg at 01D24FAA.B192ACA0] [cid:image005.jpg at 01D24FAA.B192ACA0]
134 South Fitzhugh Street Rochester, NY 14608
T: (585) 698-1956 F: (585) 325-6005
bbishop at pathfinder-ea.com<mailto:wbishop at pathfinder-ea.com> www.pathfinder-ea.com<http://www.pathfinder-ea.com/>
[http://png-5.findicons.com/files/icons/977/rrze/720/globe.png]Carbon Fee and Dividend - simple, effective, and market-based.
From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Fakeha Sehar via Equest-users
Sent: Monday, December 05, 2016 1:20 PM
To: via Equest-users <equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>>
Subject: [Equest-users] HVAC description
Hi,
I want to know how to get a concise summary of the HVAC equipment in my building. For example, system 1 supports 3 different spaces, the SIM file shows the capacity/flow rates individually for the three spaces. I want the overall system 1 capacity so that I can say that system 1 has lets say 5 ton AC.
Regards
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