Trane C.D.S. ELearning - ASHRAE Standard 62.1 And TRACE 700

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Trane C.D.S. eLearning TutorialASHRAE Standard 62.1 and TRACE 7003/31/2015TRACE 700ASHRAE Standard 62.1ASHRAE 62.1: Section 6.2Ventilation Rate Procedure (VRP) Prescribes quantity of outdoor airdelivered to each zone based How to calculate outdoor air flowneeded at the system intake 2015 Trane. All rights reserved.1

Trane C.D.S. eLearning Tutorial3/31/2015ASHRAE Standard 62.1 and TRACE 700Learning objectives Describe the multi-zonecalculation process Show how TRACE determines system level Common questionsExample: Two zone officeCalculate required outdoor air intake VAV reheat systemexhaustVAV diversityfactor:0.8 2015 Trane. All rights reserved.VAVVAVzone 11600 cfm25% min stopreturn airBlock airflow :2560 cfmsupply airunconditionedoutdoor airzone 21600 cfm25% min stop2

Trane C.D.S. eLearning Tutorial3/31/2015ASHRAE Standard 62.1 and TRACE 700ASHRAE Standard 62.1 VariablesexhaustVAVVpz 1600 cfmVpz-min 400 cfmVAVVpz 1600 cfmVpz-min 400 cfmreturn airBlock airflow :Vps 2560 cfmsupply airoutdoor airZone Airflow Rates1 1.Define Zone Level Parametersa. Define zone airflow rates and distribution effectivenessa. Ra Outdoor airflow rate per unit area (Table 6-1)b. Rp Outdoor airflow rate per person (Table 6-1)c. Ez Define zone air distribution effectiveness (Table 6-2) 2015 Trane. All rights reserved.3

Trane C.D.S. eLearning TutorialASHRAE Standard 62.1 and TRACE 7003/31/2015Zone Airflow Rates1 1.2 2.Define Zone Level Parametersa.Define zone airflow rates and distribution effectivenessa. Ra Outdoor airflow rate per unit area (Table 6-1)b. Rp Outdoor airflow rate per person (Table 6-1)c. Ez Define zone air distribution effectiveness (Table 6-2)Calculate Breathing Zone Outdoor Airflow (Vbz)a.Vbz (Rp x Pz) (Ra x Az),where Pz is the number of people and Az is the zone areaZone Airflow Rates1 1.2 2.Define Zone Level Parametersa.Calculate Breathing Zone Outdoor Airflow (Vbz)a.3 3.Define zone airflow rates and distribution effectivenessa. Ra Outdoor airflow rate per unit area (Table 6-1)b. Rp Outdoor airflow rate per person (Table 6-1)c. Ez Define zone air distribution effectiveness (Table 6-2)Vbz (Rp x Pz) (Ra x Az),where Pz is the number of people and Az is the zone areaCalculate Zone Outdoor Airflow (Voz)a.Voz Vbz/Ez 2015 Trane. All rights reserved.4

Trane C.D.S. eLearning Tutorial3/31/2015ASHRAE Standard 62.1 and TRACE 700Zone Airflow RatesCalculate Vbz and Voz:Zone 1:Zone 2: Rp 5 cfm/pRa 0.06 cfm/ft2Pz 10 peopleAz 500 ft2Ez 1.0 (cooling)OAzone 1VAVVAVVoz 240 cfmreturn airRp 5 cfm/pRa 0.06 cfm/ft2Pz 30 peopleAz 1500 ft2Ez 1.0 (cooling)supply air exhaustzone 2Voz 80 cfmASHRAE Standard 62.1/TRACE demonstration1. Area and occupancyventilation rates:OA required toremove contaminantsfrom people andbuilding materials2. Zone levelefficiency:Effectiveness of zonelevel outdoor airflowto dilute indoorcontaminants 2015 Trane. All rights reserved.5

Trane C.D.S. eLearning Tutorial3/31/2015ASHRAE Standard 62.1 and TRACE 700ASHRAE Standard 62.1/TRACE demonstration3. Area and occupancyventilation rates: Selectan appropriate standard62.1 calculationTRACE ASHRAE Standard 62.1 reportVentilation Parameters 2015 Trane. All rights reserved.6

Trane C.D.S. eLearning Tutorial3/31/2015ASHRAE Standard 62.1 and TRACE 7004 4. Determine Zone Primary OA Fraction (Zp) for each zoneexhaustOAsupply airWhereVoz zone outdoor airflowVpz-min minimum expectedzone primary airflowat the designcondition analyzedVAVVpz 1600 cfmVpz-min 400 cfmVAVVpz 1600 cfmVpz-min 400 cfmreturn airZp Voz/Vpz-min5 4. Determine critical zone (zone with maximum Zd)exhaustVAVZd 0.6return aircritical zonesupply airOAVAVZd 0.2 2015 Trane. All rights reserved.7

Trane C.D.S. eLearning Tutorial3/31/2015ASHRAE Standard 62.1 and TRACE 700TRACE ASHRAE Standard 62.1 reportVentilation Calculation for Cooling Design*6 4. Determine uncorrected OA intake (Vou)Vou D Σall zones Rp Pz Σall zones Ra Az,where D represents the occupancy diversity within the systemexhaustVAVVbz 240 cfmreturn airOAsupply airAssume D 1Vou 320 cfmVAVVbz 80 cfm 2015 Trane. All rights reserved.8

Trane C.D.S. eLearning Tutorial3/31/2015ASHRAE Standard 62.1 and TRACE 700TRACE ASHRAE Standard 62.1 reportSystem Ventilation Requirements7 4. Determine Average Outdoor Air Fraction (Xs)Xs Vou/Vpswhere Vps is system primary airflow (VAV block airflow)exhaustVAVreturn airVou 320 cfmVps 2560 cfm (fan block)Xs 0.125supply airOAVAV 2015 Trane. All rights reserved.9

Trane C.D.S. eLearning Tutorial3/31/2015ASHRAE Standard 62.1 and TRACE 700TRACE ASHRAE Standard 62.1 reportSystem Ventilation Requirements8 4. Determine system ventilation efficiency (Ev):Table6‐3A‐1or App. AEquationEv 1 Xs‐Zd‐max 1 0.125‐0.6 0.525exhaustVAVVbz 240 cfmreturn airsupply airOAVAVVbz 80 cfm 2015 Trane. All rights reserved.10

Trane C.D.S. eLearning Tutorial3/31/2015ASHRAE Standard 62.1 and TRACE 7009 4. Find outdoor intake flow (Vot):Vot Vou/Ev 320/0.525 610 cfm23.8% OA at cooling design (610 cfm/2560 cfm)exhaustsupply airVot 610 cfmVAVreturn airOAVAVTRACE ASHRAE Standard 62.1 reportSystem Ventilation Requirements 2015 Trane. All rights reserved.11

Trane C.D.S. eLearning TutorialASHRAE Standard 62.1 and TRACE 7003/31/2015TRACE and ASHRAE Standard 62.1Common Questions Why is my system 100% OA? Why does my ASHRAE multi-zone spreadsheetdoes not match the TRACE 700 output? Why does TRACE calculate Zd using Vpz-min?Resolving 100% OA Set Max Vent Allowed (Max Zd) in Create Systems AdvancedIncrease VAV min in critical zone in Create Rooms Airflows 2015 Trane. All rights reserved.12

Trane C.D.S. eLearning TutorialASHRAE Standard 62.1 and TRACE 7003/31/2015ASHRAE Standard 62.1Lesson 2: Program Methodology100% OAMax Zd 75%Max ZdProsReduce OA cfm Reduced outdoor aircfm Reduced ventilationload 2015 Trane. All rights reserved.ConsIncreased airflows Increased minimum stop Increased fan power Increased reheat loads13

Trane C.D.S. eLearning TutorialASHRAE Standard 62.1 and TRACE 7003/31/2015Impact of Zd-max on Vot and Vpz-minNote: These values are for the 2 zone exampleTRACE and ASHRAE Standard 62.1Common Questions Why is my system 100% OA? Why does my ASHRAE multi-zone spreadsheetdoes not match the TRACE 700 output? Why does TRACE calculate Zd using Vpz-min? 2015 Trane. All rights reserved.14

Trane C.D.S. eLearning TutorialASHRAE Standard 62.1 and TRACE 7003/31/2015TRACE and ASHRAE Standard 62.1Common Questions Why is my system 100% OA? Why does my ASHRAE multi-zone spreadsheetdoes not match the TRACE 700 output? Why does TRACE calculate Zd using Vpz-min? 2015 Trane. All rights reserved.15

Trane C.D.S. eLearning TutorialASHRAE Standard 62.1 and TRACE 7003/31/2015Additional resources TRACE 700 User’s ManualTRACE online (F1) ct us 2015 Trane. All rights reserved.phone I608.787.3926fax I608.787.3005email Icdshelp@trane.comWeb Iwww.tranecds.com16

ASHRAE Standard 62.1 Variables Vpz 1600 cfm Vpz-min 400 cfm Vpz 1600 cfm Vpz-min 400 cfm outdoor air supply air VAV return air VAV Block airflow : Vps 2560 cfm Zone Airflow Rates 1. Define Zone Level Parameters a. Define zone airflow rates and distribution effectiveness a. Ra Outdoor airflow rate per unit area (Table 6-1) b.

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