Long-Term Energy and Moisture Performance of Reflective and Non-reflective Roofing Systems with and Without Phase Change Materials Under Kuwaiti Climates

Hajiah, Ali; Saber, Hamed H.

doi:10.1007/978-3-030-39734-0_26

Cited by 5 publications

(7 citation statements)

References 18 publications

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“…As well, the model was to assess the energy and moisture performance of cool and black roofs with and without Phase Change Materials (PCMs) when these roofs were subjected to climatic conditions of Kuwait and Saudi Arabia (Hajiah and Saber, 2020;Saber et al, 2019b). Additionally, the model was used to investigate the impact of installing cool roofs with and without PCMs on the overall energy performance of the whole buildings, subjected to Saudi and Kuwaiti climates .…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…Building envelopes of high energy performance can lead to reducing the operational heating and cooling loads and thus reduces energy demand over time. This can clearly be achieved with different ways such as: (a) increasing the thermal resistance (R-value) of building components (walls, roofs and fenestrations), (b) using Phase Change Materials (PCMs) in the walls and roofs (Berardi and Soudian, 2019;Hajiah and Saber, 2020;Nghana and Tariku, 2016;Soares et al, 2013Soares et al, , 2014Soares et al, , 2017 and (c) use reflective materials on the external surfaces of the walls (i.e. cool walls) and roofs (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Hygrothermal performance of cool roofs with reflective coating material subjected to hot, humid and dusty climate

Saber

2021

Journal of Building Physics

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The measurements for the short-wave solar reflectivity of a Reflective Coating Material (RCM) with various cleaning operations that were obtained in a previous study were used in this study to conduct numerical simulations in order to assess the moisture and energy performance of cool and black roofs when they were subjected to the weather conditions of Saudi Eastern Province and Kuwait City. The results of the numerical simulations showed that black roofs always work with less moisture than cool roofs. Because the highest relative humidity in the different components of the black and cool roofs was well below 80%, there was no risk of condensation and mold growth in these roofs. For both weather conditions of Saudi Eastern Province and Kuwait City, the results showed that installing cool roofs have resulted in increasing the heating energy loads in relation to black roofs. Conversely, the results showed that the decrease in the cooling energy loads due to installing cool roofs were typically much greater than the increase in the heating energy loads. As such, cool roofs have resulted in net energy savings in relation to black roofs. Replacing black roof by cool roof in Saudi climate, the results showed that the annual energy savings in the total energy load was 25% and 34% as a result of installing cool roof with RCM at no cleaning and weekly homemade cleaning, respectively. Additionally, replacing black roof by cool roof in Kuwaiti climate, the results showed that the annual energy savings in the total energy load was 23% and 31% a result of installing cool roof with RCM at no cleaning and weekly homemade cleaning, respectively.

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Section: Numerical Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hygrothermal performance of cool roofs with reflective coating material subjected to hot, humid and dusty climate

Saber

2021

Journal of Building Physics

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“…In the United States, different types of reflective roofs have been used for more than 20 years [13]. Several studies on reflective roofs have shown a reduction in roof surface temperatures and energy demand that is needed for buildings [14,15,36,39,55,[71][72][73]. (4) Applying innovative practices.…”

Section: Energy Performance and Energy Saving In Buildings And Its Effect On The Environment In Hot And Cold Climate Zonesmentioning

confidence: 99%

“…Most recently, several researchers [14][15][16][72][73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88] conducted several studies to investigate the performance of cool and black roofs in terms of energy and moisture when they were subjected to different hot and humid climates in GCC countries. These studies covered several thicknesses of roof insulation material and surface solar reflectivity.…”

Section: Cool Roofs Pros and Cons And Its Relationship With The Weathermentioning

confidence: 99%

Review of White Roofing Materials and Emerging Economies with Focus on Energy Performance Cost-Benefit, Maintenance, and Consumer Indifference

2021

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This article performed a comprehensive review of the different state-of-the-art of roofing technologies and roofing materials and their impact on the urban heat island (UHI) and energy consumption of buildings. The building roofs are the main sources of undesirable heat for buildings, especially in warm climates. This paper discusses the use and application of white roofing material in emerging economies. The use of white roofing material is a suggestion because of its cooling, evaporative and efficiency characteristics compared to traditional black roofing materials. Many research studies have shown that the darker roofing surfaces that are prevalent in many urban areas actually can increase temperature by 1 to 3 degrees Celsius to the environment surrounding these urban areas. Additionally, improved temperature control and heat reflection also work to reduce the energy requirements for the interior spaces of the structures that have white roofing surfaces. The white or lighter colored roofs tend to reflect a part of the solar radiation that strikes the roof’s surface. Consequently, one might believe that white roofing material would be commonplace and especially so within emerging economies. Yet, this is hardly the case at all. This paper examines the issue of white roofing materials in emerging economies from a dual perspective. The dual perspective includes the technical details of white roofing material and its impact on lowering the interior temperature of the affected structures, which consequently reduces hours of indoor thermal discomfort and use of air conditioners in indoor spaces. The other element in this study, however, involves the marketing aspect of white roofing material. This includes its adoption, acceptance and cost-benefit in emerging economies.

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“…As provided in a number of previous studies [24][25][26][27][28][29], using reflective roofing systems of different insulation thicknesses with low short-wave solar absorption coefficients have resulted in significant reductions in the yearly energy load relative to conventional/black roofing systems with the same insulation thickness when these systems were subjected to environmental conditions of the coastal area of GCC countries. However, to investigate the impact of these reductions in the energy loads on the energy requirements for the whole building, it is important to conduct a follow-up study to assess the overall energy performance of the whole building instead of the roofing system only.…”

Section: Objectivesmentioning

confidence: 99%

Impact of reflective roofs on the overall energy savings of whole buildings

2020

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Many previous studies by the authors of this paper and others have shown that installing white/reflective/cool roofing systems resulted in energy savings. The amount of energy savings depended on the longwave thermal emissivity and the short-wave solar reflectivity of the rooftop surfaces. The question is “what is the percentage energy savings for the whole building as a result of using cool roofing systems instead of conventional/black roofing systems? To answer this question, three-dimensional energy simulations are conducted for typical Saudi buildings when they are subjected to the natural weathering conditions of the Eastern Province of Saudi Arabia. Several Window-to-Wall Ratios (WWRs) having different thermal resistances (R-values) and Solar Heat Gain Coefficients (SHGCs) are considered in the study. The windows are located in the different main solar orientations. To investigate the effect of the area ratio of the roof to the walls on the potential energy saving due to using cool roofs, one storey and two-storey are considered in this study. Results showed that using reflective materials with lower short-wave solar absorption coefficients in the roofing systems have resulted in a decrease in the yearly total energy loads of one-storey building and two-storey building.

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Long-Term Energy and Moisture Performance of Reflective and Non-reflective Roofing Systems with and Without Phase Change Materials Under Kuwaiti Climates

Cited by 5 publications

References 18 publications

Hygrothermal performance of cool roofs with reflective coating material subjected to hot, humid and dusty climate

Hygrothermal performance of cool roofs with reflective coating material subjected to hot, humid and dusty climate

Review of White Roofing Materials and Emerging Economies with Focus on Energy Performance Cost-Benefit, Maintenance, and Consumer Indifference

Impact of reflective roofs on the overall energy savings of whole buildings

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