PRESCRIPTIVE APPROACH

Transcription

1 PRESCRIPTIVE APPROACH 1. Actual and Allowed LPD 2. Complete Building Method 3. Area Category Method 4. Tailored Method This section contains exercises for lighting power adjustments, Complete Building Method, and Area Category Method. The exercises are designed to follow the forms and Certificates of Compliance for Nonresidential indoor Lighting.

2 THE COMPLIANCE PROCESS There are two major steps to Title 24 compliance: 1. Meet all mandatory requirements by installing required controls and devices and ensuring that they have all of the required functionality. 2. Meet all prescriptive or performance requirements by ensuring that the adjusted lighting power installed in a space is less than the allowed lighting power for that space. 2/17/2015 SLIDE 95 SECTION 5 PRESCRIPTIVE APPROACH

3 ACTUAL LIGHTING POWER The adjusted installed lighting power of the proposed building area is the total wattage of all planned, permanent and portable lighting systems, adjusted by the following: 1. Lighting wattage exclusions 2. Reduction of wattage through controls* 3. Up to 0.3 W/ft 2 of portable lighting for office areas ONLY is excluded* *Using the Area Category Method 2/17/2015 SLIDE 96 SECTION 5 PRESCRIPTIVE APPROACH

4 ALLOWED LIGHTING POWER The allowed indoor lighting power for each building or area is calculated using one of the following methods: Complete Building Method Area Category Tailored Method Each of these methods involves multiplying the square footage of a space by the allowed wattage per square foot for that space. 2/17/2015 SLIDE 97 SECTION 5 PRESCRIPTIVE APPROACH

5 AREA CATEGORY METHOD 2/17/2015 SLIDE 98 SECTION 5 PRESCRIPTIVE APPROACH

6 AREA CATEGORY METHOD The total allowed lighting power for the building is the sum of all allowed lighting powers for all areas in the building. An area is all adjacent spaces which are associated with a single function type listed in TABLE C. (TABLE C ) X (floor area of area) = Allowed Lighting Power for that area Photo Credit: Acuity Brands 2/17/2015 SLIDE 99 SECTION 5 PRESCRIPTIVE APPROACH

7 ADDITIONAL POWER ALLOTMENTS Additional lighting power is allowed under the Area Category Method for: Specialized task lighting Ornamental lighting White board lighting Photo Credit: Finelite Photo Credit: Tech Lighting 2/17/2015 SLIDE 100 SECTION 5 PRESCRIPTIVE APPROACH

8 LIGHTING WATTAGE EXCLUDED Wattage of many lighting applications may be excluded, including: Studio lighting for film or photography and for a videoconferencing studio Equipment that is for sale and for demonstration Lighting installed by the manufacturer in vending machines, scientific and industrial equipment, refrigerated cases, walk-in freezers, and food preparation equipment Photo: Jessie Whiteman 2/17/2015 SLIDE 101 SECTION 5 PRESCRIPTIVE APPROACH

9 LIGHTING WATTAGE EXCLUDED Up to 0.3 W of portable task lighting may be excluded from the actual lighting budget for Office Applications Finelite Curve Lumens: 362 Watts: 7.4 Efficacy: 49 CRI: 82 CCT: 3500K Cost: $220 Photo: Finelite Photo: LittleFootprint LittleFootprint Task Lamp Lumens: 220 Watts: 4 Efficacy: 55 CRI: 82 CCT: 3000K Cost: $199 Photo: Koncept Koncept Z-Bar Lumens: Unavailable Watts: 6.5 Efficacy: Unavailable CRI: 85 CCT: 3,500K / 4,500K Cost: $200 2/17/2015 SLIDE 102 SECTION 5 PRESCRIPTIVE APPROACH

10 REDUCTION THROUGH CONTROLS If you exceed the mandatory controls requirements by installing a control where it is not required, you are eligible for a Power Adjustment Factor (PAF). This will result in a lower calculated lighting power use for the installed system. ( Controlled W ) X ( PAF from A ) = Lighting Power Reduction For example, a 480 ft 2 open office plan with an occupancy control is eligible for a PAF of 0.2. Given that the controlled lighting in that space totaled 100W : (100W) X (0.2) = 20W of excluded lighting power (80W total) 2/17/2015 SLIDE 103 SECTION 5 PRESCRIPTIVE APPROACH

11 PRESCRIPTIVE APPROACH IN PRACTICE 1. Calculate the lighting power allowance 2. Calculate the total installed lighting power for all planned lighting from a lighting schedule 3. Exclude portable task lighting power for the office areas, using an option available under the Area Category Method 4. Apply control credits earned by specifying lighting controls that go beyond code requirements 5. Determine the adjusted lighting power using answers from steps one through four 6. Compare the adjusted installed lighting power to the allowed lighting power 2/17/2015 SLIDE 104 SECTION 5 PRESCRIPTIVE APPROACH

12 PRESCRIPTIVE APPROACH IN PRACTICE Forms can be downloaded from the Energy Commission's website at energy.ca.gov/title24/2013standards/nonresidential_manual.html NRCC-LTI-01-E: Indoor Lighting NRCC-LTI-02-E: Indoor Lighting Lighting Controls NRCC-LTI-03-E: Indoor Lighting Power Allowances Note: The forms included in this module have been adapted for the purpose of the exercises. Please download the complete forms on the California Energy Commission website. 2/17/2015 SLIDE 105 SECTION 5 PRESCRIPTIVE APPROACH

13 J.S.H ASSOCIATES J.S.H Associates is a 1,944-square-foot office building. OFFICE INFORMATION Open Office: 532 ft 2 Private Office: 222 ft 2 Conference Room: 252 ft 2 Main Lobby: 228 ft 2 Kitchen: 156 ft 2 Corridors: ft 2 Restroom 1: 51 ft 2 Restroom 2: 51 ft 2 Copy Room: ft 2 2/17/2015 SLIDE 106 SECTION 5 PRESCRIPTIVE APPROACH

14 J.S.H ASSOCIATES: 1,944 FT 2 OFFICE BUILDING SECTION 5

15 INDOOR LIGHTING SCHEDULE 2/17/2015 SLIDE 108 SECTION 5 PRESCRIPTIVE APPROACH

16 EXERCISE: INSTALLED LIGHTING POWER The schedule is used to fill in lighting schedule in Form NRCC-LTI-01-E : NRCC-LTI-01-E: Indoor Lighting 2/17/2015 SLIDE 109 SECTION 5 PRESCRIPTIVE APPROACH

17 EXERCISE: AREA CATEGORY METHOD: DETERMINE COMPLIANCE Required Forms: NRCC-LTI-03-E: Indoor Lighting Power Allowances 2/17/2015 SLIDE 110 SECTION 5 PRESCRIPTIVE APPROACH

18 SUMMARY OF ALLOWED LIGHTING POWER 2/17/2015 SLIDE 111 SECTION 5 PRESCRIPTIVE APPROACH

19 SUMMARY OF ALLOWED LIGHTING POWER 2/17/2015 SLIDE 112 SECTION 5 PRESCRIPTIVE APPROACH

20 SUMMARY OF ALLOWED LIGHTING POWER Area by area, the LPD of the spaces within the building is calculated. All areas in the project are added together. The lighting plan complies if the total installed lighting power is less than or equal to the allowed lighting power. NRCC-LTI-03-E: Indoor Lighting Power Allowances 2/17/2015 SLIDE 113 SECTION 5 PRESCRIPTIVE APPROACH

21 INSTALLED LIGHTING POWER The installed lighting power includes all planned permanent and portable lighting. Complete the lighting schedule in "C. Indoor Lighting Schedule and Field Inspection Energy Checklist" to determine the total to use for compliance purposes. 2/17/2015 SLIDE 114 SECTION 5 PRESCRIPTIVE APPROACH

22 DETERMINE LIGHTING POWER ALLOWANCE 1. There are six primary function areas in this space. Determine the allowed lighting power of each area according to Table C. 2. Determine the square feet of each area type. 3. Calculate the wattage allowance by multiplying the square feet of the each area type by the additional watts allowed. 4. Total the allowed watts. (TABLE C ) X (floor area of area) = Allowed Lighting Power for that area 2/17/2015 SLIDE 115 SECTION 5 PRESCRIPTIVE APPROACH

23 J.S.H ASSOCIATES: 1,944 FT 2 OFFICE BUILDING RESTROOM #1 51 ft 2 RESTROOM #2 51 ft 2 OPEN OFFICE 532 ft 2 PRIVATE OFFICE 222 ft 2 COPY ROOM ft 2 CORRIDOR ft 2 KITCHEN 156 ft 2 CONFERENCE ROOM 252 ft 2 MAIN ENTRY LOBBY 228 ft 2 SECTION 5

24 TABLE C: AREA CATEGORY METHOD LIGHTING POWER DENSITY VALUES 2/17/2015 SLIDE 117 SECTION 5 PRESCRIPTIVE APPROACH

25 EXAMPLE: LIGHTING POWER ALLOWANCE Some of the areas in the example are eligible for an additional wattage allowance for specialized lighting. The footnotes in Table C are used to determine how much can be allocated. This is a "use it, or lose it" allowance. If there is no lighting in the schedule that qualifies for the additional allowance, it cannot be used. 2/17/2015 SLIDE 118 SECTION 5 PRESCRIPTIVE APPROACH

26 ADDITIONAL LIGHTING WATTAGE ALLOWANCE The suspended luminaire in the lobby is classified as "Ornamental lighting," as defined in Section and in accordance with Section 140.6(c)2. The white board lighting in the conference room also qualifies for an additional lighting wattage allowance according to Table C. 1. Determine the additional watts allowed according to the footnotes in Table C. Ornamental Lighting: 0.5 W / ft 2 Whiteboard Lighting: 5.5 W per linear foot 2. Determine the square feet of the office primary function area. For white board lighting, determine the linear feet of white board. Ornamental Lighting: 228 ft 2 Whiteboard Lighting: 7 feet 3. Calculate the wattage allowance by multiplying the square feet of the sales area by the additional watts allowed. Ornamental Lighting: 38.5 W Whiteboard Lighting: 114 W 4. Choose the smaller of either the newly calculated allowed watts or the total design watts of the luminaire. There are 38.5 W for ornamental lighting and 22.5 W for white board lighting, totaling 61W of additional allowed lighting wattage. 2/17/2015 SLIDE 119 SECTION 5 PRESCRIPTIVE APPROACH

27 TOTAL LIGHTING POWER ALLOWANCE Calculate the adjusted installed lighting power by adding the additional lighting wattage allowance to the general lighting power allowance. 1,797 W + 61 W = 1,858 W 2/17/2015 SLIDE 120 SECTION 5 PRESCRIPTIVE APPROACH

28 INSTALLED PORTABLE LUMINAIRES 1. Multiply the watts per luminaire by the number of luminaires to determine installed portable luminaire watts in this office. LED Undercabinet: 122 W LED Task Light: 6.5 W 2. Determine the square feet of each office primary function area. Open Office: 532 ft 2 Private Office: 222 ft 2 3. Divide the installed portable luminaire watts by the square feet of the office to determine watts per square foot. LED Undercabinet: 122 W 532 ft 2 = 0.23 W / ft 2 LED Task Light: 6.5 W 222 ft 2 = 0.03 W / ft 2 4. Determine accountable wattage by multiplying the square feet of the office primary function area by the watts per square feet. If the watts per square foot is 0.3, claim 0 W of accountable watts for installed portable luminaires. LED Undercabinet Task: 0 W LED Task Light: 0 W 2/17/2015 SLIDE 121 SECTION 5 PRESCRIPTIVE APPROACH

29 LIGHTING CONTROL CREDITS REQUIRED FORMS: NRCC-LTI-02-E: Indoor Lighting Lighting Controls According to Table A, this design is eligible for a PAF, which lowers the calculated lighting power use for the installed system. Partial-ON occupancy controls in the restrooms and copy room Combined manual dimming plus partial-on occupant sensing control in the conference room 2/17/2015 SLIDE 122 SECTION 5 PRESCRIPTIVE APPROACH

30 MANDATORY AND PRESCRIPTIVE INDOOR LIGHTING CONTROL SCHEDULE, PAF CALCULATION, AND FIELD INSPECTION CHECKLIST Restroom #1 Partial-ON occupancy Sensor 1 P E P E P 32 W Restroom #2 Partial-ON occupancy Sensor 1 P E P E P 32 W Copy Room Partial-ON occupancy Sensor 1 P E P E P 64 W Conference Room Combined Manual Dimming 1 P P P P E P 133 W and Partial-ON Occupancy Sensor P P P P W 2/17/2015 SLIDE 123 SECTION 5 PRESCRIPTIVE APPROACH

31 LIGHTING CONTROL CREDITS 1. Determine the PAF using Table A. Restrooms and Copy Room: 0.2 Conference Room: Calculate the watts of controlled lighting. Restroom #1: 32 W Restroom #2: 32 W Copy Room: 64 W Conference Room: 133 W 3. Multiply the watts of controlled lighting by the PAF to determine the control credit. Restroom #1: 32 W x 0.20 = 6.4 W Restroom #2: 32 W x 0.20 = 6.4 W Copy Room: 64 W x 0.20 = 12.8 W Conference Room: 133 W x 0.25 = W 4. Total the control credits to determine how many lighting control credits are available for this space = W of lighting control credits W 2/17/2015 SLIDE 124 SECTION 5 PRESCRIPTIVE APPROACH

32 ADJUSTED LIGHTING POWER Use the "Summary of Allowed Lighting Power" in Form NRCC - LTI E to calculate the adjusted installed lighting power by adding the portable lighting and subtracting the lighting control credits from the total installed lighting. 1,178.2 W + 0 W 93.4 W = 1,084.8 W of adjusted lighting power W 1, W Our lighting plan is compliant. 2/17/2015 SLIDE 125 SECTION 5 PRESCRIPTIVE APPROACH

33 TAILORED METHOD 2/17/2015 SLIDE 126 SECTION 5 PRESCRIPTIVE APPROACH

34 TAILORED METHOD This is the most granular of the three methods. Allowances for each area (just like area category) Allowances for display and task lighting within an area Allowed lighting power is determined by the occupancy type and the physical characteristics (e.g. ceiling height) of a space. See Table D for details. 2/17/2015 SLIDE 127 SECTION 5 PRESCRIPTIVE APPROACH

35 ALLOWANCES UNDER THE TAILORED METHOD The Tailored Method adds additional lighting power allowances for: Wall displays Floor displays Task lighting Ornamental/special effects lighting Very valuable display cases These lighting power allowances cannot be used in any space other than the display or task area. Any wattage not covered by these allowances must be deducted from the general lighting allowance for that area. 2/17/2015 SLIDE 128 SECTION 5 PRESCRIPTIVE APPROACH