TRACE™ 700 Learning Series Module 6: Additional Features · sensible heat equation. If the input...

TRACE™ 700 Learning SeriesModule 6: Additional Features

Advanced OptionsgbXML ImportingModule 6 Exercise-Bringing It All Together

Learning Objectives• Access advanced load parameters

• Learn ways to improve input process

• Customize default settings for easier project creation

• How to easily compare results

TRACE™ 700 Learning Series

©Trane a business of Ingersoll Rand Module 06: Additional Features l 1

Change Load Parameters

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Advanced Options

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Component and Project Tree Views

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Customized Settings

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Report Features

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Conclusion• Different load methodologies can impact the

overall calculated size of fans and coils• Every advanced feature can drastically impact

results – please adjust carefully• You can simplify the input and output process by

selecting different views



Learning Objectives

• Define what is a gbXML file

• Understand the benefits of working with gbXMLfiles in TRACE

• Import and export a gbXML from TRACE

• Know the best practices to work with gbXML files



What is gbXML?

• Green Building XML

• eXtensible Markup Language (XML) Computer language

gbXML is an open schema used to exchange building data from a modeling software to an analysis software and back.

Steps to Use a gbXML File with TRACE

1. Export gbXML from CAD program

2. Import the file into TRACE 700 (select the elements to import)

3. Verify and complete inputs

4. Run simulation

5. Verify outputs through reports

6. Export gbXML from TRACE 700

7. Import the gbXML file to the CAD program

TM

1

34567

2



Import a gbXML file into TRACETM

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Best practices

• Connected walls

• Plenum spaces

• Partitions

• Keep both files in your local computer

• Rooms with unique names - no special characters

• Verify your inputs

• Keep it simple



Conclusion

• Green Building XML is used to transfer building data from a CAD software to TRACE to perform Load calculations

• Verify and complete inputs before running the load calculation

• Avoid importing partitions and plenums



Purpose:• Practice creating a simple building using concepts

learned in the TRACE 700TM Load Design modules.

Procedure:• Begin with a new file.• Create and apply templates.• Assign rooms to their appropriate airside systems.• Calculate and analyze results.• Review Questions.

Exercise: Bringing It All Together

PayoffHow to apply the basics you have

learned to model a complex building.

Learn/practice methods to make

effective & efficient inputs.



Office 101Office 102

Offi

ce 1

03O

ffice

104

Office 105 Office 106 Office 107

Break Room

Restroom2

Lobby

Data Center

South Corridor Area

1120 ft2

Door10’ wide8’ high

Glass30% for all walls except

Data Centerand Restrooms

North Corridor Area

1120 ft2

N

12’

15’

15’

35’

35’ 30’

50’

35’

15’

25’

15’

20’

35’

30’ 30’ 35’

15’

10’

Restroom 1

15’

20’

35’

35’

Note: Use the default values for any information not given. Begin with a new TRACE file.

For this exercise, you will be modeling a building that has been converted to an office/data center facility. Using what you have learned, model the building per the following information.

Methodology:CLTD (cooling), UATD (heating)

Location:Memphis, Tennessee

Let’s solve it together…

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Templates AnalysisRoom (#)

Internal LAirflow

ThermostatClgD/HtgD/R

HConstruction

People Lights Misc. L.

Office (7) Office Office Office 20 cfm/per 75/70/50% Y

Break Room (1) BR BR BR 20 cfm/per 75/70/50% Y

Restroom (2) RR RR RR 0 75/70/50% Y

Corridor(2) C C C .05 cfm/ft2 75/70/50% Y

Lobby (1) L L L 15 cfm/per 75/70/50% Y

DataC (1) DC DC DC .15 cfm/ft2 70/65/40% Y ‐ height

Create templates

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Create Rooms

Office 101Office 102

Offi

ce 1

03O

ffice

104

Office 105 Office 106 Office 107

Break Room

Restroom2

Lobby

Data Center

South Corridor Area

1120 ft2

Door10’ wide8’ high

Glass30% for all walls except

Data Centerand Restrooms

North Corridor Area

1120 ft2

N

12’

15’

15’

35’

35’ 30’

50’

35’

15’

25’

15’

20’

35’

30’ 30’ 35’

15’

10’

Restroom 1

15’

20’

35’

35’

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Create Systems

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Assign Rooms to Systems

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Calculate and View Results

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Review Questions1. Why would the Available (100%) schedule not be the best

schedule to select for the people schedule?

The Available (100%) schedule attributes 100% of the load 24/7 to allcalculations. Per ASHRAE recommendation (see 2009 ASHRAEHandbook of Fundamentals, p. 18.28), the heating design calculationshould not include internal heat gains (e.g. people).Therefore, applying this schedule would account for internal heatgains. Using this schedule could result in Undersizing the heatingcapacity.

Review Questions2. How would you model occupancy sensors for lighting in TRACE?

Since lighting schedules dictate when lighting heat gain is considered,simply create a lighting schedule that follows the occupancy schedule.In other words, if you have occupancy scheduled from 8 am to noonand then 1 pm to 5 pm. You would create a lighting schedule where thelights were on from 8 am to noon and 1 pm to 5 pm. All other hourswould show the lights as off.



Review questions3. If the supply air temperature is lower than expected, what steps

could you take to increase the temperature?

The most obvious choice would be to set the temperature through CreateSystems on the Temp/Humidity tab. However, one should investigate first tobetter understand why TRACE reports the temperature at the lower value.Remember, TRACE psychrometrically calculates the supply air temperaturebased on the loads in the space. Therefore, reviewing the defined loads mayuncover an input error (poor scheduled, too high value, improper customconstruction, etc.). Another avenue to explore would be the Airflows tab inCreate Rooms. Perhaps airflows were defined. Remember, if airflow isdefined, TRACE will then determine the supply air temperature using thesensible heat equation. If the input airflow is low, TRACE will have to dropthe supply air temperature in order to satisfy the load.

Review questions4. If water-source heat pumps were used for the office spaces

instead of VAV, how would you set up the file so that Offices104 and 105 share a heat pump?

Aside from selecting the water-source heat pump system, you willfirst need to change the cooling coil location from Room to Zone.This can be done through Create Systems and selecting theAdvanced button on the Selection tab. Next, you will have tocreate a zone under the water-source heat pump system andassign Offices 104 and 105 to this zone. You can then assign allother offices to the system. Remember, any room assigneddirectly to the system is also considered a zone.



Review questions

5. If you define a cooling supply air temperature, how will TRACE determine the associated CFM?

TRACE will solve the sensible heat equation using the calculated load and defined cooling supply air temperature to find the CFM.

phone I 608.787.3926

fax I 608.787.3005

email I [email protected]

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