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Title 24 2019 Part 6 - Your Greatest Ideas Turned Into Code Change

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A high level overview of changes to the nonresidential energy standard Title 24 Part 6. HVAC, ASHRAE 90.1 equivalent. 2019.

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Title 24 2019 Part 6 - Your Greatest Ideas Turned Into Code Change

  1. 1. Title 24 2019 – Your Greatest Ideas Turned Into Codes 02.04.2019 Neil Bulger, PE Red Car Analytics 4460 Chico Ave. Santa Rosa, California 95407
  2. 2. Big Bold Goals in 2011
  3. 3. Residential Code Change (NET ZERO 2020!?#$#!) Commercial Code Change (NET ZERO 2030)
  4. 4. Commercial Building (Non-Res) When 2019 Code Change Advocacy Starts Code is Law 2020
  5. 5. Information Is Online (As of 4/23/2018) https://www.energy.ca.gov/title24/2019standards/rulemaking/doc uments/2018-05-09_hearing/2019_Revised_EnergyCode.php
  6. 6. Mandatory HVAC Changes 1. Higher Filtration 2. Balanced Ventilation Multi-Family 3. Commercial Ventilation Calculation 4. Natural Ventilation / Exhaust Rates / DCV & Occ Control 5. Fault Detection for All 6. Equipment Efficiency 7. Demand Management Prescriptive HVAC Changes 1. Cooling Tower 2. Fan Power Formula 3. Exhaust Transfer Air 4. Solar Hot Water Lighting Changes Process Systems a) Variable Fumehoods Control b) Stack Exhaust Fan Power Topics Included Today
  7. 7. Mandatory Requirements 120.1 Ventilation and Indoor Air Quality MERV 13 filters required Multifamily HVAC Systems All Non-Res HVAC Systems
  8. 8. Mandatory Requirements 120.1 Ventilation and Indoor Air Quality Balanced Ventilation Systems Multifamily Buildings Pnnl.gov basc.pnnl.gov/resource-guides/whole-building-delivered-ventilation
  9. 9. • Exhaust only is most common. • Not very effective ventilation. • Air comes from where? • Cannot filter the air. • It is low cost. • It was standard when buildings were leaky and had low exhaust rates.
  10. 10. 120.1 Ventilation and Indoor Air Quality Mandatory Requirements New Ventilation Equation Nonresidential Title 24 2019 Semi-Simple Method Space Types & Names
  11. 11. For ventilation quantities, all spaces covered by part 6 (ENERGY CODE) take precedence over part 4 (MECH CODE).
  12. 12. 120.1 Ventilation and Indoor Air Quality Mandatory Requirements New Ventilation Equation Nonresidential Simple Formulas Vz = Rp x Pz Vent = 15 cfm/person x People Vz = Ra x Az Vent = xx cfm/sf_type x Area OR Greater of the two equations
  13. 13. Space Types & Names 120.1 Ventilation and Indoor Air Quality New Ventilation Equation Nonresidential Unique airflow rates for California Unique airflow rates for California
  14. 14. Exhaust cfm/sf Supply cfm/sf [3] Supply cfm/sf [2] Supply cfm/sf [1] 120.1 Ventilation and Indoor Air Quality 2016 Nonresidential Aiflow/Area table 2019 Nonresidential Aiflow/Area table
  15. 15. 120.1 Ventilation and Indoor Air Quality Mandatory Requirements New Ventilation Equation Nonresidential Simple Formulas Vz = Rp x Pz Vent = 15 cfm/person x People Vz = Ra x Az Vent = xx cfm/sf_type x Area OR Vent = 0.15 cfm/sf_type* x Area The Demand Control Ventilation lower limit *most spaces
  16. 16. 120.1 Ventilation and Indoor Air Quality Mandatory Requirements New Ventilation Equation Nonresidential Simple Formulas Ventilation in Commercial Buildings will Increase In Most Cases
  17. 17. 120.1 Ventilation and Indoor Air Quality Required Demand Control Ventilation Required for All Spaces Greater than: 25 people per 1000 sq ft (or, less than: 40 square feet / person)
  18. 18. 120.1 Ventilation and Indoor Air Quality Occupancy Sensing Zone Controls Mandatory Requirements All Spaces that require Lighting Shut-Off Controls shall require ventilation controls to go to ZERO for allowable space types. Office Space Corridor Multipurpose Assembly Classrooms Conference Rooms
  19. 19. 120.1 Ventilation and Indoor Air Quality Filtration Ventilation Air Exhaust Air New Formula Semi-Same cfm/sf or cfm/person New Table cfm/sf MERV 13 Demand Control Vent (CO2) Occ Sensing Control Vent
  20. 20. 120.1 Ventilation and Indoor Air Quality Natural Ventilation Nonresidential 1. Single Sided Opening 2. Double Sided Opening 3. Corner Opening Openable area shall be not less than 4 percent of the net occupiable floor area. 225 sf office x 4% = 9 sqft Mandatory Requirements
  21. 21. 120.2 Economizer Fault Detection Diagnostics (FDD) http://www.automatedbuildings.com/news/feb13/ articles/adms/130121113909adms.html Required for All Air Handling Units with Mechanical Cooling > 54,000 BTU Not just Packaged Units Mandatory Requirements
  22. 22. 110.12 Demand Management New Section to Code HVAC Some Rooms + / - 4 deg F Lighting Above 10,000 sf 15% LPD reduction Mandatory Requirements Shall Be Capable of
  23. 23. 5 tons (65,000 BTU) 60 tons (760,000 BTU) 11.4 IEER 12.9 IEER 9.8 IEER 11.2 IEER 2016 2019 110.2 Equipment Efficiencies are Going Up Equipment Efficiency Rating No change in EER No change in EER Mandatory Requirements
  24. 24. “Variable Speed compressors & Evaporative Condensing Units can get up to 16.9 IEER.” “Some rooftop unit configurations are as high as 13.6 EER.”
  25. 25. 140.4 HVAC Changes Cooling Towers https://spxcooling.com/coolingtowers Prescriptive Requirements
  26. 26. 140.4 HVAC Changes Cooling Towers Was 40 gpm/hp Prescriptive Requirements
  27. 27. 140.4 HVAC Changes Cooling Towers Was 40 gpm/hp Now 60 gpm/hp (tried for 80 gpm/hp) Slightly larger tower size. This is the same impact as picking a ‘low approach’ tower. 5 deg to 6 deg F approach tower vs typical 8 to 10 deg F. Prescriptive Requirements
  28. 28. 140.4 HVAC Changes (New Section) (o) Exhaust System Transfer Air Shall Not Exceed: 1. Supply for Heating / Cooling 2. Allowed Ventilation Rate 3. Exhaust Total – Transferred Air Prescriptive Requirements
  29. 29. 140.4 HVAC Changes Fan Power New Formula Prescriptive Requirements Previously T24, 2016 Total hp > 25 hp had a limited W/cfm Now for T24, 2019, Total hp > 5 hp has a limited W/cfm Adopting ASHRAE 90.1 2016 Pressure Credit Method
  30. 30. 140.4 HVAC Changes Fan Power New Formula Adopting ASHRAE 90.1 2016 Pressure Credit Method Prescriptive Requirements Option 1 Option 2
  31. 31. 140.4 HVAC Changes Fan Power New Formula Constant Volume Fans Variable Volume Fans < 0.82 W/cfm < 1.2 W/cfmOption 1 Rated size Option 2 Rated power < 0.70 W/cfm +A < 0.97 W/cfm +A hp < cfm x 0.0011 hp < cfm x 0.0015 bhp < cfm x 0.00094 + A bhp < cfm x 0.0013 + A Prescriptive Requirements
  32. 32. 140.4 HVAC Changes Fan Power New Formula Constant Volume Fans Variable Volume Fans < 0.82 W/cfm < 4.3 inches TSP* < 1.2 W/cfm < 5.9 inches TSP* hp < cfm x 0.0011 hp < cfm x 0.0015 bhp < cfm x 0.00094 + A bhp < cfm x 0.0013 + A < 0.70 W/cfm +A < 4 inches TSP* +A < 0.97 W/cfm +A < 5.5 inches TSP* +A *assuming 60% for fan efficiency Prescriptive Requirements Option 1 Rated size Option 2 Rated power
  33. 33. Adjustment Credits (A) Option 2 Rated Power bhp < cfm x 0.00094 + A bhp < cfm x 0.0013 + A < 0.70 W/cfm +A < 4 inches TSP* +A < 0.97 W/cfm +A < 5.5 inches TSP* +A
  34. 34. 140.4 HVAC Changes Fan Power New Formula Variable Volume Fan < 5.5 inches TSP + Fully Ducted Return < 5.5+0.5 inches TSP + Energy Recovery Ventilator at 65% effective < 5.5+0.5+1.0 inches TSP Prescriptive Requirements Option 2 Rated Power
  35. 35. 140.5 Hot Water Heating Exception ADDED for 8 stories and above for requiring solar hot water. Compliance Change
  36. 36. 140.9 HVAC Process Changes Laboratory Variable Flow Fumehoods Prescriptive Requirements
  37. 37. 140.9 HVAC Process Changes Laboratory Stack Exhaust Fan Power Prescriptive Requirements
  38. 38. 140.9 HVAC Process Changes Laboratory Stack Discharge Exhaust Fan Power Maximum Pressure Drop of 0.85 inches with air treatment 0.65 inches without Prescriptive Requirements
  39. 39. https://www.laboratoryequipment.com 140.9 HVAC Process Changes Laboratory Stack Exhaust Fan Power Prescriptive Requirements
  40. 40. Where will we find the gold in performance compliance? 140.6 Lighting Power Density
  41. 41. 140.6 Lighting Power Density Building Method new LPDs Most Building LPDs are Reducing Lighting by 20% to 40% Prescriptive Requirements
  42. 42. 140.6 Lighting Power Density Building Area Method new LPDs
  43. 43. 140.6 Lighting Power Density Building Area Method new LPDs Lower General Lighting (New) Task Lighting (Additional lighting)
  44. 44. https://www.slideshare.net/AZMAT0/lighting-systems-and-their-designmau-jmi2014
  45. 45. 140.6 Lighting Controls Credit for Daylighting Architectural Features
  46. 46. Mandatory HVAC Changes 1. Higher Filtration 2. Balanced Ventilation Multi-Family 3. Commercial Ventilation Calculation 4. Natural Ventilation / Exhaust Rates / DCV & Occ Control 5. Fault Detection for All 6. Equipment Efficiency 7. Demand Management Prescriptive HVAC Changes 1. Cooling Tower 2. Fan Power Formula 3. Exhaust Transfer Air 4. Solar Hot Water Lighting Changes Process Systems a) Variable Fumehoods Control b) Stack Exhaust Fan Power Topics Included Today
  47. 47. Questions Title 24 2019 – Your Greatest Ideas Turned Into Codes Neil Bulger, PE Red Car Analytics neil@redcaranalytics.com www.redcaranalytics.com 4460 Chico Ave. Santa Rosa, California 95407

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