QC Task Checked?

Building Shell/Envelope

Interior vs exterior surfaces correct? Y

Y

Check wall constructions & assigments Y

Check roof constructions & assigments Y

Y

Y

Is the site altitude modeled correctly? Y

Y

Y

Internal Loads/Space levels

Check LPDs and schedules by space Y

Check EPDs and schedules by space Y

Y

Check occupancy and schedules by space Y

Y

Are plenums modeled correctly? Model as uncon. Zones if return air is via ductwork

Check slab constructions & assigments (did you do the F factor calcs?)

Check window constructions & assignments (did you convert U-value to GLASS-CONDUCTANCE?)

Skylights with Plenum zones: is this modeled correctly or are the skylights "blocked" by the plenum underneath?Are all overhangs and building shades included?Is there something nearby like a lake or mountain range that needs to be accounted for?

Check infiltration (core zones should be zero, create custome schedules to simulate opening doors, etc.)

Do special rooms (like Mech. Rms) have their own schedules?

Internal Loads/Space levels

Y

Y

Y

Name spaces to match actual room names Y

Thermal Zones

Y

Y

Y

Model exhaust fans at the zone level

Air Side HVAC

Break up fan and compressor power Y

Baseline fan power calculated per 90.1 YEconomizer YModel condenser fans

Check supply air setpoints Y

Y

Check VAV fan turn down Y

Y

Check presence of VAV central heating coil YSet crankcase heat to zero Y

Y

Water Side Plants

Y

Daylighting: are you controlling the correct fraction of lights in each space?

Set Space Temp to estimate of temp during peak loads for uncond. Zones

Make sure space type (conditioned vs plenum, etc) is consistent with zone type

Check Tstat setpoints and corresponding schedules (the schedule actual dictates the setpoint)

Set correct OA requirements (specify EITHER cfm/person or cfm/sf, not both)Names zones to match space names (but with "Zn" at the end)

Assign zones to correct systems and specify correct control zone if constant volume

Model resets for supply air temps if applicable.

Model fan schedules and night cycling as appropriate

Make sure furnace inputs are not enabled unless they should be

If you have multiple boilers and chillers, are they being staged correctly?

Water Side Plants

Y

Check chiller COP, boiler EIR Y

Y

Y

Y

Y

Other

Y

Set user defined defaults wherever you can

Y

Compare results to rules of thumb

If you have multiple boilers and chillers that are autosized, do you have them sized at an equal fraction of the total (should sum to 1.0)?

DHW process load schedules - the schedule fractions are for the entire hour, so make sure the product of that and the peak gpm is correct.

Check cooling tower condenser water design temperature and approach

Check cooling tower fan EIR - this is an expression of hp/gpm. Right click the help menu to see how to make this conversion. Check cooling tower pump W/GPM.

Chilled and hot water loops - make sure you're loops are set up correctly. For instance, if you have primary/secondary pumping, you need 2 loops (a primary one hooked to the equipment and a secondary one serving the air side systems)Do not overspecify the pumps - enter either the kW and gpm or the head and efficiency, not both!Model utility rates (easiest to do this in the wizard)

Run QC check (under tools, after you simulate)

Check BEPS and SS-R reports for unmet load hoursCheck peak loads reports to make sure they make senseCheck SV-A reports to make sure they make sense

Comments

A couple of spaces labeled "core" are EXT space types, spaces below atriums?

NA for baseline

Unconditioned spaces have lights and plugs schedule same as occuppied spaces.

Not modeled as light-weight steel-framed with cavity and continuous insulation but overall U-value is okay. Using U-value method instead of layers method precludes the consideration of the wall mass in the heat flow analysis.

EL2 Roof and EL3 Roof have reflectivity of 0.40 not 0.30 because they are under walkways? Overall U-value all roofs is 0.048 per 90.1. Using U-value method instead of layers method precludes the consideration of the roof mass in the heat flow analysis.

Underground walls 90.1 C-factor = 1.140, slab F-factor=0.730 (uninsulated). Model explicitly?

ASHRAE 90.1 data do not match input values; see Window Data tab. Model value is 0.66 conductance (excludes exterior film coefficient). 90.1 value is 0.43 or 0.55 depending on the window type. Note: door conductance in model is same as wall conductance but in 90.1 values for doors are different. For skylights, U-value input does not match any of the 90.1 values. Probably need to check output of overall U-value to make sure it matches the 90.1 value.

Skylight roofs are directly linked to spaces but ceilings are still modeled. Ceilings are next to plenums, which have roofs connected to the ambient. Thus, you have greater heat loss from roof area than you should.

Building area method LPD value = 1.1. This is for general lighting and its regulated. Display and accent lighting for museums is not regulated. You should also model this value (e.g under task lights)Spaces modeled with 1 W/ft2, a few with 3 W/ft2. For visual exhibit areas/corridors the 1 W/ft2 seems high. This impacts electric energy use and cooling energy use.

NA for baseline

Not done. It is helpful for error checking.

NA

Values look reasonable but should follow method outlined in G3.1.2.9.None present per 90.1 for CZ 4A

Okay accept for big turn down for heating with no morning warm up modeled.

Reset schedule has 10 dT but 90.1 Appendix G G3.1.3.12 states a 5 dT.

Night cycle control is off

NA

NA

A couple of spaces labeled "plenum" above EL3 perimeter spaces are "conditioned". These zones are havnig loads not being met as shown in the SS-R report for Public AHU.

Really large setback for heating can result in oversized autosized heating equipment and poor part load performance. Modify schedule to ease into morning warm up.

Value is currently based on occupancy. Default value of 20 CFM/person used. Per 62.1 for museum galleries, the value is 9 CFM/person based on 40 people/1000 ft2 and 0.06 CFM/ft2. In case DCV is to be modeled in later runs, include cfm/ft2 for unoccupied condition.

Only three systems model but per 90.1 should have one system per floor plus any additional systems if the exceptions noted in G3.1.1.

Value of 40% of design flow in SV-A output report but input value is consistent with 90.1 specified value of 0.4 CFM/ft2.

None modeled. Should include to avoid overcooling and reheating during cool conditions.

Second boiler is on for a~ 400 hours during the year. Second chiller is on for 45 hours per year. The sizing / staging of the plant equipment should be improved. Overall efficiencies are not bad though.

0.163934

22.52042

Need to add rates

Chiller size is above 800 tons. Must add 3rd chiller. If you add night cycle control, you may reduce morning cooling load and having two chillers might be okay.

Per 90.1, 6.1 COP for chillers and 80% boiler efficiency. EIRs are 0.164 and 1.25. Model uses 6.1 but EIR reported as 0.169? Boiler EIR In model is 1.25.

DC has 76 F design wetbulb. Model uses 78F design T. Design temperature should be 85 F or a 10 F approach to wetbulb, whichever is lower. Model shows 7 F, which gets to the same 85 F design temperature.

90.1 Baseline value for heat rejection fans and pumping is 38.2 GPM/hp and 19 W/GPM, respectively. Design value for fans in model is 5132/(170/0.746) =22.5 (too low). Design value in model for pumping is 102000/5100 = 20 (pretty close)

Chillers should be on primary (rides the pump curve) and secondary (variable speed drives ) with VSDs. Boiler loop is primary only with variable speed drive. It doesn't appear that you have pumps associated with the chiller. These represent the primary loop and should ride the pump. The chilled water loop is the secondary loop. It is modeled with constant flow pumps but should be modeled with VSD pumps. The boilers as modeled are okay. There are no pumps associated with the boilers and the hot-water loop pumps have VSDs.

Not all loads met ~ 12% of the time most likely due to the plenum zones being considered to be conditioned or if these really are conditions, their supply design flow needs to be increased. Sometimes not having a central heating coil can cause this too.

1.25

20

Window Calcs

Window Description

DataCenter of Glass

U-valueSHGCBtu/hr ft2

New - All ASHRAENew - All ASHRAE* Excludes outside air-film coefficient

DataCenter of Glass Overall Window + Frame DOE-2 Modeling Inputs

TvisU-value

SHGC TvisU-value*

SC TvisBtu/hr ft2 Btu/hr ft20.72 0.4 0.4 0.57 0.43 0.46 0.570.72 0.5 0.4 0.61 0.55 0.46 0.61

Weather BUILDING LATITUDE ( 38.9), LONGITUDE ( 70.0), OR TIME ZONE ( 4) DISAGREES WITH WEATHER FILE, WHICH HAS LATITUDE 38.9, LONGITUDE 77.0, AND TIME ZONE 5. VALUES FROM WEATHER FILE WILL BE USED TO ASSURE CONSISTENCY BETWEEN CALCULATED SUN POSITION AND SOLAR DATA FROM WEATHER FILE.

MetricsModel *DOE

see units MJ/m2 MJ/m2Heating (kBTU/SF) 27.6 313.5 70.1

Cooling (kWh/SF) 3.8 137.0 110.9

Total All Energy (kBtu/SF) 102.4 1162.4 586.3

Lighting Load (kBtu/SF) 13.9 157.4 139.1

Plug Load (kBTU/SF) 23.0 261.0 181.0

* Published values for Large Office in DC based on reference building models developed from CBECs data characterizing new construction

Rule of ThumbHeating capacity (Mbtu/hr) 9.9 Heating capacity (Btu/ SF) 30.0 15-20Cooling capacity (tons) 1,836.7 Cooling capacity (SF/ton) 179.1 400Chilled water flow (GPM) 3,599.0 2.5Chilled water flow (GPM/ton) 20.1 2.5Condenser water flow (GPM) 5,100.0 Condenser water flow (GPM/ton) 2.8 3Air flow Collections (CFM) 182,282.0 298602.1Air flow Collections (CFM/ft2) 0.6 <1Air flow Public (CFM) 191,615.0 196116.6Air flow Public (CFM/ft2) 1.0 <1Air flow Non Public (CFM) 55,832.0 196116.6Air flow Non Public (CFM/ft2) 0.3 <1Air flow total (CFM) 429,729.0 Air flow total (CFM/ft2) 1.3 <1

BUILDING LATITUDE ( 38.9), LONGITUDE ( 70.0), OR TIME ZONE ( 4) DISAGREES WITH WEATHER FILE, WHICH HAS LATITUDE 38.9, LONGITUDE 77.0, AND TIME ZONE 5. VALUES FROM WEATHER FILE WILL BE USED TO ASSURE CONSISTENCY BETWEEN CALCULATED SUN POSITION AND SOLAR DATA FROM WEATHER FILE.

Total Floor Area (SF) 698,469 Conditioned Floor Area (SF) 328,921 Total Volume (CF) 8,370,381

* Published values for Large Office in DC based on reference building models developed from CBECs data characterizing new construction

1 kBtu/ft2/yr = 11.356 MJ/m2/yr