Download presentation

Presentation is loading. Please wait.

Published byCordell Duffield Modified over 3 years ago

1
Technology in Architecture Lecture 4 Lighting Design Example Lecture 4 Lighting Design Example

2
Example 1 Room Layout Calculation Example 1 Room Layout Calculation

3
Example 1 Classroom 20 x 27 x 12E=50 fc WP= 2-6 AFF ρ c = 80%h cc = 0.0 ρ w = 50%h rc = 9.5 ρ f = 20%h fc = 2.5 fixture: fluorescent (#38) maintenance: yearly replacement: on burnout voltages & ballast: normal environment: medium clean

4
Example 1 Confirm fixture data S: T.15.1 p. 641

5
Example 1 Complete #1-6

6
Example 1 7. Determine lumens per luminaire Obtain lamp lumens from manufacturers data (or see Stein: Chapter 12) S: T. 12.5 p. 546

7
Lumen Flux Method 8. Record dimensional data 20 27 0 9.5 2.5 ρ c = 80% ρ w = 50% ρ f = 20%

8
Coefficient of Utilization Factor(CU) Calculation 9. Calculate Cavity Ratios

9
Example 1: Cavity Ratios CR = 5 H x (L+W)/(L x W) RCR = 5 H rc x (L+W)/(LxW) = 4.1 CCR = 5 H cc x (L+W)/(LxW) = 0 FCR = 5 H fc x (L+W)/(LxW) = 1.1

10
Coefficient of Utilization Factor(CU) Calculation 10. Calculate Effective Ceiling Reflectance

11
3. Obtain effective ceiling reflectance: Example 1: Coefficient of Utilization (CU) S: T.15.2 p. 667

12
Example 1 11. Calculate Effective Floor Reflectance Stein: T.15.2 P. 666

13
3. Obtain effective ceiling reflectance: Example 1: Coefficient of Utilization (CU) S: T.15.2 p. 667 CU= 0.19 0.20

14
Example 1 12. Select CU from mfrs data or see

15
CU=0.32 Example 1: Coefficient of Utilization (CU) RCRCU 4.0 0.39 4.1 X 5.0 0.35 CU= 0.386 S: T.15.1 p. 641

16
Example 1 13-21 Calculate LLF

17
Example 1: Light Loss Factor(LLF) 13-16 All factors not known 0.88

18
Example 1: Light Loss Factor(LLF) 17. Room Surface Dirt (based on 24 month cleaning cycle, normal maintenance) Direct0.92 +/- 5%

19
Light Loss Factor(LLF) Calculation 18. Lamp Lumen Depreciation Group Burnout Fluorescent0.900.85

20
Example 1: Light Loss Factor(LLF) 19. Burnouts Burnout0.95

21
Example 1: Light Loss Factor(LLF) 20. Luminaire Dirt Depreciation (LDD) Verify maintenance category S: T.15.1 p. 641

22
Example 1: Light Loss Factor(LLF) 20. Luminaire Dirt Depreciation (LDD) S: F.15.34 p. 663 LDD=0.80

23
Example 1: Light Loss Factor(LLF) LLF = [a x b x c x d] x e x f x g x h LLF = [0.88] x 0.92 x 0.85 x 0.95 x 0.80 LLF = 0.52

24
Example 1 22. Calculate Number of Luminaires 22 23

25
Example1: Calculate Number of Luminaires No. of Luminaires = (E x Area)/(Lamps/luminaire x Lumens/Lamp x CU x LLF) (50 X 540)/(4 X 2950 x 0.386 x 0.52) = 11.4 luminaires

26
Example 1 Goal is 50 fc +/- 10% 45-55 fc Luminaires E (fc) 1043.9 x 1148.2ok 2 rows of 4, 1 row of 3 1252.6ok 3 rows of 4 1357.0x Verify S/MH for fixture, space geometry

27
Example 1: S/MH Ratio Verify S/MH ratio MH=12.0-2.5=9.5 S/MH = 1.0 S 9.5 S: T.15.1 p. 641

28
Try 3 rows of 4 luminaires S/2+3S+S/2=20 S=5 S/MH=5/9.5 1.0 ok S/2+S+S+s/2=27 S=9 S/MH=9/9.5 1.0 ok Example 1: Spacing S/2 S S S S/2 20 27 S/2 S S/2

29
Try 4 rows of 3 luminaires S/2+2S+S/2=20 S=6.67 S/MH=6.67/9.5 1.0 ok S/2+3S+s/2=27 S=6.75 S/MH=6.75/9.5 1.0 ok Example 1: Spacing S/2 S S S/2 20 27 S/2 S S/2

30
Example 2 Economic Analysis Example 2 Economic Analysis

31
Example 2: Economic Analysis Operation: 8AM-5PM, M-F, 52 wks/yr 9 x 5 x 52 = 2,340 hrs/yr Operating Energy: 128 watts/luminaire Lighting Control: Daylighting sensor with 3- step controller

32
Example 2: Economic Analysis Connected Lighting Power (CLP): CLP=12 x 128= 1,536 watts (2.8 w/sf) Adjusted Lighting Power (ALP): ALP=(1-PAF) x CLP

33
Example 2: Economic Analysis Power Adjustment ControlFactor (PAF) Daylight Sensor (DS),0.30 continuous dimming DS, multiple-step dimming0.20 DS, On/Off0.10 Occupancy Sensor (OS)0.30 OS, DS, continuous dimming0.40 OS, DS, multiple-step dimming0.35 OS, DS, On/Off0.35 Source: ASHRAE 90.1-1989

34
Example 2: Economic Analysis Adjusted Lighting Power (ALP): ALP=(1-PAF) x CLP ALP=(1-0.20) x 1536 ALP= 1229 watts (2.3 w/sf)

35
Example 2: Economic Analysis Energy= 1,229 watts x 2,340 hrs/yr =2,876 kwh/year Electric Rate: $0.081/kwh Annual Energy Cost= 2,876 kwh/yr x $0.081/kwh = $232.94/yr

36
Example 2: Economic Analysis An alternate control system consisting of a daylighting sensor, with continuing dimming and an occupancy sensor can be substituted for an additional $150. Using the simple payback analysis method, determine if switching to this control system is economically attractive.

37
Example 2: Economic Analysis Power Adjustment ControlFactor (PAF) Daylight Sensor (DS),0.30 continuous dimming DS, multiple-step dimming0.20 DS, On/Off0.10 Occupancy Sensor (OS)0.30 OS, DS, continuous dimming0.40 OS, DS, multiple-step dimming0.35 OS, DS, On/Off0.35 Source: ASHRAE 90.1-1989

38
Example 2: Economic Analysis Adjusted Lighting Power (ALP): ALP=(1-PAF) x CLP ALP=(1-0.40) x 1536 ALP= 922 watts (1.7 w/sf)

39
Example 2: Economic Analysis Energy= 922 watts x 2,340 hrs/yr = 2,157 kwh/year Annual Energy Cost = 2,157 kwh/yr x $0.081/kwh = $174.72/yr Annual Savings = 232.94 – 174.72= $58.22/year Simple Payback= Additional Cost/Annual Savings = 150.00/58.22 = 2.6 years < 3 years Economically attractive

40
Example 3 Point Source Calculation Example 3 Point Source Calculation

41
Example 3 Spot Lighting – lamp straight down S: F.15.48 p. 677 S: F.15.49 p. 677

42
Example 3 Spot Lighting – lamp pointed at object S: F.15.49 p. 677 Cp at 90 = 9600 Horizontal illumination= 9900(0.643) 3 = 25.5 fc 10 2 Vertical illumination= 9900(0.766) 3 = 30.3 fc 12 2

Similar presentations

OK

“Reading Measurement Scales”. MNI = marked number interval AMI = adjacent number interval.

“Reading Measurement Scales”. MNI = marked number interval AMI = adjacent number interval.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on aravind eye care system Presentation ppt on leadership Ppt on holographic technology for health Ppt on earth movements and major landforms of the united Ppt on case study in psychology Ppt on ideal gas law units Ppt on sources of water for kindergarten Ppt on sectors of economy Ppt on ufo and aliens Ppt on international channels of distribution