Optimal daylight factor for energy-efficient toplighting system

Younju Yoon, William P. Bahnfleth, Martin Moeck, Richard George Mistrick

Research output: Contribution to journalConference article

Abstract

Skylights can introduce considerable heat gain and loss that may offset the benefits of electric light savings and cause an increase in yearly net energy use. The design of a toplight system needs to take into consideration different toplighting types, including aperture size and orientation, electric lighting control, and, most importantly, the local climate. This study examines the impacts of aperture size (day light factor) for four combinations of toplighting strategies and glazing types on the total yearly energy loads for a prototypical open office space situated in four different climates. This study shows that toplighting systems designed to meet a 2% daylight factor are not optimal. The optimum daylight factor varies depending on toplighting type, local climate, and the thermal and solar heat gain properties of the glazing.

Original languageEnglish (US)
Pages (from-to)622-632
Number of pages11
JournalASHRAE Transactions
Volume112 PART 2
StatePublished - Oct 31 2006
Event2006 Annual Meeting of the American Society of Heating, Refrigerating and Air-Conditioning Engineers, ASHRAE - Quebec City, QC, Canada
Duration: Jun 24 2005Jun 28 2005

Fingerprint

Electric lighting
Dynamic loads
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Mechanical Engineering

Cite this

@article{787be28da1ad40a39bc6c19ef16710e1,
title = "Optimal daylight factor for energy-efficient toplighting system",
abstract = "Skylights can introduce considerable heat gain and loss that may offset the benefits of electric light savings and cause an increase in yearly net energy use. The design of a toplight system needs to take into consideration different toplighting types, including aperture size and orientation, electric lighting control, and, most importantly, the local climate. This study examines the impacts of aperture size (day light factor) for four combinations of toplighting strategies and glazing types on the total yearly energy loads for a prototypical open office space situated in four different climates. This study shows that toplighting systems designed to meet a 2{\%} daylight factor are not optimal. The optimum daylight factor varies depending on toplighting type, local climate, and the thermal and solar heat gain properties of the glazing.",
author = "Younju Yoon and Bahnfleth, {William P.} and Martin Moeck and Mistrick, {Richard George}",
year = "2006",
month = "10",
day = "31",
language = "English (US)",
volume = "112 PART 2",
pages = "622--632",
journal = "ASHRAE Transactions",
issn = "0001-2505",
publisher = "Amer. Soc. Heating, Ref. Air-Conditoning Eng. Inc.",

}

Optimal daylight factor for energy-efficient toplighting system. / Yoon, Younju; Bahnfleth, William P.; Moeck, Martin; Mistrick, Richard George.

In: ASHRAE Transactions, Vol. 112 PART 2, 31.10.2006, p. 622-632.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Optimal daylight factor for energy-efficient toplighting system

AU - Yoon, Younju

AU - Bahnfleth, William P.

AU - Moeck, Martin

AU - Mistrick, Richard George

PY - 2006/10/31

Y1 - 2006/10/31

N2 - Skylights can introduce considerable heat gain and loss that may offset the benefits of electric light savings and cause an increase in yearly net energy use. The design of a toplight system needs to take into consideration different toplighting types, including aperture size and orientation, electric lighting control, and, most importantly, the local climate. This study examines the impacts of aperture size (day light factor) for four combinations of toplighting strategies and glazing types on the total yearly energy loads for a prototypical open office space situated in four different climates. This study shows that toplighting systems designed to meet a 2% daylight factor are not optimal. The optimum daylight factor varies depending on toplighting type, local climate, and the thermal and solar heat gain properties of the glazing.

AB - Skylights can introduce considerable heat gain and loss that may offset the benefits of electric light savings and cause an increase in yearly net energy use. The design of a toplight system needs to take into consideration different toplighting types, including aperture size and orientation, electric lighting control, and, most importantly, the local climate. This study examines the impacts of aperture size (day light factor) for four combinations of toplighting strategies and glazing types on the total yearly energy loads for a prototypical open office space situated in four different climates. This study shows that toplighting systems designed to meet a 2% daylight factor are not optimal. The optimum daylight factor varies depending on toplighting type, local climate, and the thermal and solar heat gain properties of the glazing.

UR - http://www.scopus.com/inward/record.url?scp=33750283251&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33750283251&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:33750283251

VL - 112 PART 2

SP - 622

EP - 632

JO - ASHRAE Transactions

JF - ASHRAE Transactions

SN - 0001-2505

ER -