-)A 20 ft by 24 ft office has a 14 ft ceiling height, with room surface reflectances of 80% ceiling, 50%walls, and 20% floor. Technical information for the luminaire that you selected to light this space isshown below, and from that you have determined that each luminaire has 4500 lumens. Theluminaires are pendant mounted and hang 2 ft below the ceiling. How many luminaires areneeded to produce an average of 30 footcandles on the desks (30" AFF) in the office? Show yourwork and keep track of units as you set up and solve the equations. Specifically, show the values ofthe RCR and CU as part of your work. Catalog #ProjectLKW forThis lomaticeCommentsPrepared byC2-30.1T5APPEARATHO4500 LemensEfficiency 90.9%Test ReportTL5:17895Coefficients of UtilizationAGA0NATDONI 2 9Effective floor cavity reflectance70 50 30 10 70 50 30 10Zonal Lumen SummaryLumens Limp Fixture5509CORELITE™200910000MAADDE PTypeDateAnglein DelPENN!!!3100P50 30 10 50 30JE TE JE57 55- 54 411 4151 48 1545 12 3041 37 3133233:29 26Luminance DataMODE0 Dig 45 DogCUSM28101432031 28 2720-25-925-24 2123-20 1827-20-20-2018 1624 2017 10 0 10925 18-16 2017-10- 1255 12-11 78POTMP BE102P20129-31 J78 25 2424 25 2P20-TE 118 17 1517-15-015-12-19IQD252523CÓÓÓÓĆCandelaAngle058515TE1515ElementAlong II44-4125720FIT151

The dimension of the office is 20 ft by 24 ft.The ceiling height is 14 ft.Room surface reflectances…

A 20 ft by 24 ft office has a 14 ft ceiling height, with room surface reflectances of 80% ceiling, 50% walls, and 20% floor. Technical information for the luminaire that you selected to light this space is shown below, and from that you have determined that each luminaire has 4500 lumens. The luminaires are pendant mounted and hang 2 ft below the ceiling. How many luminaires are needed to produce an average of 30 footcandles on the desks (30" AFF) in the office? Show your work and keep track of units as you set up and solve the equations. Specifically, show the values of the RCR and CU as part of your work.

A 20 ft by 24 ft office has a 14 ft ceiling height, with room surface reflectances of 80% ceiling, 50% walls, and 20% floor. Technical information for the luminaire that you selected to light this space is shown below, and from that you have determined that each luminaire has 4500 lumens. The luminaires are pendant mounted and hang 2 ft below the ceiling. How many luminaires are needed to produce an average of 30 footcandles on the desks (30" AFF) in the office? Show your work and keep track of units as you set up and solve the equations. Specifically, show the values of the RCR and CU as part of your work.

Introductory Circuit Analysis (13th Edition)

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ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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The conversion of electrical energy to heat energy is known as electric heating. The heating system that converts the electrical energy to heat energy for various application is called electrical heating unit. Electricity is employed as the firing mechanism in electric heating systems, which transforms electric current to heat. Electric heaters have heating elements in the form of electric resistors.

Question

-)
A 20 ft by 24 ft office has a 14 ft ceiling height, with room surface reflectances of 80% ceiling, 50%
walls, and 20% floor. Technical information for the luminaire that you selected to light this space is
shown below, and from that you have determined that each luminaire has 4500 lumens. The
luminaires are pendant mounted and hang 2 ft below the ceiling. How many luminaires are
needed to produce an average of 30 footcandles on the desks (30" AFF) in the office? Show your
work and keep track of units as you set up and solve the equations. Specifically, show the values of
the RCR and CU as part of your work.

Catalog #
Project
LKW for
This lomatice
Comments
Prepared by
C2-30.1T5
APPEARATHO
4500 Lemens
Efficiency 90.9%
Test Report
TL5:17895
Coefficients of Utilization
AGA
0
NATDONI 2 9
Effective floor cavity reflectance
70 50 30 10 70 50 30 10
Zonal Lumen Summary
Lumens Limp Fixture
5509
CORELITE™
2009
10000
MAA
D
DE P
Type
Date
Angle
in Del
PEN
N!!!
3100
P
50 30 10 50 30
JE TE JE
57 55- 54 411 41
51 48 15
45 12 30
41 37 31
332
33:29 26
Luminance Data
MODE
0 Dig 45 Dog
CUSM
2810
14320
31 28 27
20-25-9
25-24 21
23-20 18
27-20-20-2018 16
24 2017 10 0 10
925 18-16 2017-10- 1255 12-11 78
POT
MP BE
102
P
201
29-31 J
78 25 24
24 25 2
P
20-TE 1
18 17 15
17-15-0
15-12-19
IQ
D
252523CÓÓÓÓĆ
Candela
Angle
0
5
85
15
TE
15
15
Element
Along II
44-4
125
720
FIT
151

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Step 1: Summarize the given information.

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Step 2: Writing the formula of illuminance.

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Step 3: Calculating area of the office.

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Step 4: Calculating the Coefficient of Utilization (CU) and Room Cavity Ratio (RCR).

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Step 5: Calculating the Luminous Flux (Lumens) to achieve 30 footcandles.

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Step 6: Calculating the number of luminaires.

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