Instituto Tecnológico y de Estudios Superiores de MonterreyCampus Querétaro

LIGHTING EFFICIENCY

Edification & Energy EfficiencyProf. M. Arch. Susana García-San Román, LEED AP BD+C

LIGHTING BASIC CONCEPTS

What is the difference among:

•INCANDESCENT LAMPS•FLUORESCENT TUBES•FLUORESCENT COMPACT LAMPS (CFL)•HALOGEN LAMPS•LEDS (LIGHTING EMITTING DIODES)

from the point of view of energy efficiency? What is the luminous efficacy of each type (lumens/watt)?

LIGHTING BASIC CONCEPTSLUMINOUS FLUX (lumens) and ILLUMINANCE LEVEL (lux)

HOUSE HOLD LIGHTING POWER DENSITY (watts/m2) ESTIMATION ACTIVITY

FOR YOUR HOUSE:

1- COUNT LAMPS AND MAKE A LIST SPECIFYING POWER (watts) OF EACH ONE, ORGANIZED FOR EACH SPACE

2- DETERMINE LUMINOUS FLUX (lumens) OF EACH LAMP BASED ON ITS EFFICACY

3- ESTIMATE ILLUMINANCE LEVEL (LUX) OF EACH ROOM BASED ON SQUARE FOOTAGE (LUX = LUMEN / M2)

4- CHECK RECOMMENDATION BY IESNA:

HOUSE HOLD LIGHTING POWER DENSITY (watts/m2) ESTIMATION ACTIVITY

FOR YOUR HOUSE:

5- ESTIMATE LIGHTING POWER DENSITY (LPD) FOR EACH ROOM (watts/m2)

6- CHECK COMPLIANCE WITH RECOMMENDED LIMITS OF LPD (NMX-AA-164-SCFI)

LIGHTING BASIC CONCEPTS

LIGHTING POWER DENSITY (watts/m2)

1- FOR ENERGY MODELING: INTERNAL HEAT GAINS

2- FOR ELECTRICAL BALANCE: PV ARRAY SIZING

LIGHTING POWER DENSITY (watts/m2)

STEP 1: DETERMINE ILLUMINANCE LEVEL IN EACH SPACE (LUX) BASED ON IESNA (ILLUMINATION ENGINEERS SOCIETY OF NORTHAMERICA) RECOMMENDATIONS FOR DIFFERENT TASKS

LIGHTING POWER DENSITY (watts/m2)

STEP 2: DETERMINE LUMINOUS FLUX IN EACH SPACE (Lumens) BASED ON SURFACE AREA OF EACH SPACE (lux x m2 = lm)

Space 1…X m2X luxX lm

X watts

Space 2…X m2X luxX lm

X watts

LIGHTING POWER DENSITY (watts/m2)

STEP 3: DETERMINE LIGHTING POWER IN EACH SPACE (watts) BASED ON EFFICACY OF SELECTED LAMPS (lm/watt)

Space 1…X m2X luxX lm

X wattsX watts/m2

LIGHTING POWER DENSITY (watts/m2)

STEP 4: ESTIMATE LIGHTING POWER DENSITY IN EACH SPACE (watts/m2) AND VERIFY THAT THIS IS BELOW THE LIMIT LPD ACCORDING TO THE MEXICAN NORM NMX-AA-164-SCFI

Space 1…LPD

X watts/m2