Exploring the building energy impacts of green roof design decisions-a modeling study of buildings in four distinct climates

David Sailor, Timothy B. Elley, Max Gibson

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

This study explores the complex and interacting physical mechanisms that lead to building energy use implications of green roof design decisions. The EnergyPlus building energy simulation program, complete with an integrated green roof simulation module, was used to analyze the effects of roof surface design on building energy consumption. Simulations were conducted for both black and white membrane control roofs and nine variations of green roofs. The investigation included a total of eight buildings-new office and new multi-family lodging buildings, each in four cities representing diverse climatic conditions: Houston, Texas; New York City, New York; Phoenix, Arizona; and Portland, Oregon. Building energy performance of green roofs was generally found to improve with increasing soil depth and vegetative density. Heating (natural gas) energy savings were greatest for the lodging buildings in the colder climates. Cooling energy (electricity) savings varied for the different building types and cities. In all cases, a baseline green roof resulted in a heating energy cost savings compared to the conventional black membrane roof. In six of the eight buildings, the white roof resulted in lower annual energy cost than the baseline green roof. However, a high vegetative cover green roof was found to outperform the white roof in six of the eight buildings.

Original languageEnglish (US)
Pages (from-to)372-391
Number of pages20
JournalJournal of Building Physics
Volume35
Issue number4
DOIs
StatePublished - Apr 2012
Externally publishedYes

Fingerprint

Roofs
Mine roof control
Membranes
Heating
Office buildings
Costs
Natural gas
Energy conservation
Energy utilization
Electricity
Cooling
Soils

Keywords

  • building energy simulation
  • ecoroofs
  • EnergyPlus
  • green roofs

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

Cite this

Exploring the building energy impacts of green roof design decisions-a modeling study of buildings in four distinct climates. / Sailor, David; Elley, Timothy B.; Gibson, Max.

In: Journal of Building Physics, Vol. 35, No. 4, 04.2012, p. 372-391.

Research output: Contribution to journalArticle

@article{d6cfdb2a4bea40c0b3110e9b91f6a75f,
title = "Exploring the building energy impacts of green roof design decisions-a modeling study of buildings in four distinct climates",
abstract = "This study explores the complex and interacting physical mechanisms that lead to building energy use implications of green roof design decisions. The EnergyPlus building energy simulation program, complete with an integrated green roof simulation module, was used to analyze the effects of roof surface design on building energy consumption. Simulations were conducted for both black and white membrane control roofs and nine variations of green roofs. The investigation included a total of eight buildings-new office and new multi-family lodging buildings, each in four cities representing diverse climatic conditions: Houston, Texas; New York City, New York; Phoenix, Arizona; and Portland, Oregon. Building energy performance of green roofs was generally found to improve with increasing soil depth and vegetative density. Heating (natural gas) energy savings were greatest for the lodging buildings in the colder climates. Cooling energy (electricity) savings varied for the different building types and cities. In all cases, a baseline green roof resulted in a heating energy cost savings compared to the conventional black membrane roof. In six of the eight buildings, the white roof resulted in lower annual energy cost than the baseline green roof. However, a high vegetative cover green roof was found to outperform the white roof in six of the eight buildings.",
keywords = "building energy simulation, ecoroofs, EnergyPlus, green roofs",
author = "David Sailor and Elley, {Timothy B.} and Max Gibson",
year = "2012",
month = "4",
doi = "10.1177/1744259111420076",
language = "English (US)",
volume = "35",
pages = "372--391",
journal = "Journal of Building Physics",
issn = "1744-2591",
publisher = "SAGE Publications Ltd",
number = "4",

}

TY - JOUR

T1 - Exploring the building energy impacts of green roof design decisions-a modeling study of buildings in four distinct climates

AU - Sailor, David

AU - Elley, Timothy B.

AU - Gibson, Max

PY - 2012/4

Y1 - 2012/4

N2 - This study explores the complex and interacting physical mechanisms that lead to building energy use implications of green roof design decisions. The EnergyPlus building energy simulation program, complete with an integrated green roof simulation module, was used to analyze the effects of roof surface design on building energy consumption. Simulations were conducted for both black and white membrane control roofs and nine variations of green roofs. The investigation included a total of eight buildings-new office and new multi-family lodging buildings, each in four cities representing diverse climatic conditions: Houston, Texas; New York City, New York; Phoenix, Arizona; and Portland, Oregon. Building energy performance of green roofs was generally found to improve with increasing soil depth and vegetative density. Heating (natural gas) energy savings were greatest for the lodging buildings in the colder climates. Cooling energy (electricity) savings varied for the different building types and cities. In all cases, a baseline green roof resulted in a heating energy cost savings compared to the conventional black membrane roof. In six of the eight buildings, the white roof resulted in lower annual energy cost than the baseline green roof. However, a high vegetative cover green roof was found to outperform the white roof in six of the eight buildings.

AB - This study explores the complex and interacting physical mechanisms that lead to building energy use implications of green roof design decisions. The EnergyPlus building energy simulation program, complete with an integrated green roof simulation module, was used to analyze the effects of roof surface design on building energy consumption. Simulations were conducted for both black and white membrane control roofs and nine variations of green roofs. The investigation included a total of eight buildings-new office and new multi-family lodging buildings, each in four cities representing diverse climatic conditions: Houston, Texas; New York City, New York; Phoenix, Arizona; and Portland, Oregon. Building energy performance of green roofs was generally found to improve with increasing soil depth and vegetative density. Heating (natural gas) energy savings were greatest for the lodging buildings in the colder climates. Cooling energy (electricity) savings varied for the different building types and cities. In all cases, a baseline green roof resulted in a heating energy cost savings compared to the conventional black membrane roof. In six of the eight buildings, the white roof resulted in lower annual energy cost than the baseline green roof. However, a high vegetative cover green roof was found to outperform the white roof in six of the eight buildings.

KW - building energy simulation

KW - ecoroofs

KW - EnergyPlus

KW - green roofs

UR - http://www.scopus.com/inward/record.url?scp=84859355213&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84859355213&partnerID=8YFLogxK

U2 - 10.1177/1744259111420076

DO - 10.1177/1744259111420076

M3 - Article

VL - 35

SP - 372

EP - 391

JO - Journal of Building Physics

JF - Journal of Building Physics

SN - 1744-2591

IS - 4

ER -