Energy analysis of the daylighting from a double-pane glazed window with enclosed horizontal slats in the tropics

Fathoni, Andhy Muhammad; Chaiwiwatworakul, Pipat; Mettanant, Vichuda

doi:10.1016/j.enbuild.2016.06.034

Cited by 15 publications

(5 citation statements)

References 24 publications

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“…In general, shading reported values are consistent in both major climate groups, averaging around 25% in potential cooling demand savings for warm-dry and warm-humid contexts. Similarly, best reported results are comparable, reaching maximum values of 55.6% and 54.6% in the warm-humid climates of Bangkok(Aw) (Fathoni, Chaiwiwatworakul, & Mettanant, 2016) and Trieste (Cfa) (Manzan, 2014); and 53.8% and 45.2% in the hot-summer mediterranean climate of Santiago, Chile (Csb) (Pino et al, 2012) and the hot desert climate of Dubai (BWh) (Bahaj et al, 2008), respectively. The 93.2% cooling savings reported by Baldinelli (2009) for a case in central Italy (Csa) was identified as an outlier considering its large difference and uniqueness compared to the rest of the sample.…”

Section: Shadingmentioning

confidence: 64%

“…Exploring the differences from the evaluated cases, it could be seen that in general, equator facing offices have larger cooling savings potential, basically due to the high solar incidence in the north and south façade in southern and northern hemispheres respectively. Maximum reported values for equator facing offices are 55.6% (Fathoni et al, 2016) while maximum savings reach 39% in the case of east-west oriented rooms in the humid subtropical climate of Turin (Schulze & Eicker, 2013).…”

Section: Shadingmentioning

confidence: 92%

“…Nonetheless, reported results seem to hint at louvers and screens having more savings potential than the use of overhangs, which make sense considering the amount of exposed window area. Maximum reported cooling savings are 55.6%, 53.8% and 41.1% for the use of screens (Fathoni et al, 2016), external louvres (Pino et al, 2012), andoverhangs (Pino et al, 2012), respectively. In any case, further information would be needed for a detailed evaluation of several shading types in different climate zones, besides considering particularities from each case and shading design.…”

Section: Shadingmentioning

confidence: 99%

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Coolfacade

Prieto Hoces

2018

Architecture and the Built Environment

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The thesis ‘COOLFACADE – Architectural integration of solar cooling strategies in the building envelope’ aims to shed light on the possibilities and constraints for architectural integration of solar cooling systems in façades, in order to support the design of climate responsive architectural products for office buildings as self-sufficient alternatives to conventional air-conditioning systems. Increasing cooling needs in the built environment present an important and complex challenge for the design of sustainable buildings and cities. Even though the first course of action should always aim to reduce energy consumption through saving measures and passive design, this is often not enough to avoid mechanical equipment altogether, particularly in the case of office buildings in warm climate contexts. Solar cooling technologies have been increasingly explored, as an environmentally friendly alternative to harmful refrigerants used within vapour compression systems; while also being driven by solar, thus, renewable energy. The principles behind some of these technologies have been researched for over a century, reaching mature solutions and components, and being recognised as promising alternatives to common air-conditioning units. Nonetheless, building application remains mostly limited to demonstration projects and pilot experiences. Recently, façade integrated concepts have been explored, as a way to promote widespread application throughout the development of multifunctional building components. However, while these are regarded as relevant and promising standalone concepts, further research is still needed to assess the integration potential of diverse solar cooling technologies, and identify barriers to overcome, in order to promote the widespread application of solar cooling components in the built environment. The aim of this research project is to explore the possibilities and constraints for architectural integration of solar cooling strategies in façades, in order to support the design of climate responsive architectural products for office buildings, without compromising the thermal comfort of users. The underlying hypothesis then is that self-sufficient solar cooling integrated facades may be a promising alternative to conventional centralised air-conditioning systems widely used in office buildings in warm climates. Most research efforts on solar cooling currently deal with the optimisation of the systems in terms of their performance, testing new materials and simplifying their operation to increase reported efficiencies. However, there is a lack of knowledge on the requirements and current limits for widespread façade application. In order to achieve the research goal and comprehensively assess the façade integration potential of solar technologies and discuss current barriers, different aspects must be acknowledged. These distinct aspects are addressed through several research questions, which in turn define the different chapters of the dissertation. Introduction and conclusions aside, the research body is structured on three sequential parts, with 2-3 chapters each. The first part deals with the state-of-the-art in the field and the theoretical framework, laying the groundwork for the following sections. The second part explores different aspects required as input for façade integration; while the third part comprises the evaluation of solar cooling technologies in terms of current possibilities and constraints for the development of integrated façades, based on the inputs identified in the second part. Furthermore, all chapters were published or submitted for publication as scientific articles in peer review academic journals. The first part considers two chapters that lay the foundations for the research project, The first chapter after the introduction expands the background of the dissertation by identifying knowledge gaps and research trends while contributing to the generation of a reference database of research experiences, throughout a systematic literature review of cooling research in office buildings during the last 25 years. On the other hand, the following chapter delves specifically in the main themes addressed within the dissertation, proposing a framework for the understanding of solar cooling integrated façades. This considers the theoretical discussion of the concept of architectural façade integration; and the identification of the main working principles and technical components from most common solar cooling technologies, based on a state-of-the-art review. The second part explores different required inputs for façade integration. Design and construction requirements for façade integration are explored; while the response from façade design parameters to various climate conditions is assessed in parallel. The exploration of design and construction requirements is conducted through the identification of the main perceived problems for the façade integration of building services and solar technologies, by means of a survey addressed to façade professionals. On the other hand, a separate chapter explores the relation between climate conditions and cooling requirements in office buildings, evaluating the potential impact of several passive cooling strategies in various warm climates, as a first step before considering further technologies. This was conducted through the statistical analysis of reported research experiences, and dynamic energy simulations of a base scenario using specialised software. The third part of the dissertation consists of two chapters that incorporate previous outcomes for the evaluation of selected solar cooling technologies in terms of current possibilities and constraints for the development of integrated façades. The first of these chapters showcases a qualitative evaluation of the façade integration potential of several solar cooling technologies, based on a comprehensive review of key aspects of each technology and their prospects to overcome the identified barriers for façade integration. This is complemented by a feasibility assessment of integrated concepts in several climates, throughout numerical calculations based on climate data and building scenarios simulated with specialised software; showcased in the following and final chapter. The driving force of the research project is the intention to test the limits of solar cooling integration in façades, showcasing current possibilities while identifying technical constrains and barriers to overcome for the widespread application of integrated façade concepts. Although interesting prospects were identified in this dissertation, important technical constraints need to be solved to conceive a façade component fail-tested for application in buildings. Furthermore, several barriers related to the façade design and development process would need to be tackled in order to introduce architectural products such as these into the building market. The identification and discussion of these barriers, along with the definition of technology driven development paths and recommendations for the generation of distinct architectural products, are regarded as the main outcomes of this dissertation, serving as a compass to guide further explorations in the topic, under an overall environmentally conscious design approach.

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Section: Shadingmentioning

confidence: 64%

Section: Shadingmentioning

confidence: 92%

Section: Shadingmentioning

confidence: 99%

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Coolfacade

Prieto Hoces

2018

Architecture and the Built Environment

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“…A review of the effect of building envelops of high-rise buildings in hot-humid climate on the thermal comfort and energy efficiency focusing the Malaysian tropical climate highlights passive design method as one of the most potential strategies applied on building envelope in hot-humid tropical regions and based on the research findings in the same context establishes recommendations for envelop design strategies to be used by the designers for high-rise buildings [28]. Similarly, a number of researches have been carried out worldwide that indicate the importance of the building façade design on thermal performance of a particular building and on energy efficiency [29][30][31][32].…”

Section: Multi-level Air-conditioned Buildingsmentioning

confidence: 97%

Environmental Heat Stress on Indoor Environments in Shallow, Deep and Covered Atrium Plan Form Office Buildings in Tropics

Rajapaksha¹

2020

Climate

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Environmental heat stress on buildings through façades contributes to indoor overheating and thus increases demand for energy consumption. The study analyzed the problem, heat gain risk, of modern air-conditioned multi-level office buildings in tropics, for example Colombo. Plan form, orientation, sectional form and envelope were identified and theorized to understand design interventions to reduce the risk of getting heat stress on indoor environments. On-site thermal performance investigations in multi zones of identified three typical built forms, namely; shallow, deep and covered atrium plan forms, quantified the heat stress. Reaching the daytime indoor and surface temperature in peripheral zones of multi-story office buildings during air conditioning “off-mode” up to 38 °C–42 °C was seen as a critical heat stress situation to be addressed through building design. Shading or insulation on façades to control environmental heat gain and manipulation of building section for night ventilation to remove internal heat developed during the daytime are discussed. However, the significance of the plan form depth was found to be a main contributor in dealing with heat transfer to indoor space. Deep plan form was found to be more effective in controlling environmental heat transfer to indoor space across the plan depth.

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“…In this sense, Fathoni et al [8] investigated the energy performance of daylight in office buildings in Thailand, and reported that in certain cases the heat dissipated by lamps accounted for 20% of the building cooling load noting that these numbers are significant and deserve attention.…”

Section: Referencesmentioning

confidence: 99%

Evaluation of Daylighting and Thermo-Energetic Performance in Administrative Building in the South of Brazil

Moura¹,

Correa²,

Cunha³

2020

JCEA

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Daylight is a fundamental element to obtain built environments that promote environmental comfort and energy efficiency. However, strategies that enhance the building daylight performance can affect its thermal energetic performance. In this sense, research that addresses these aspects at the same time is considered essential. The objective of this paper was to evaluate the daylighting and thermal-energetic performance of administrative environments in a public institution, and to propose strategies that will enhance the use of daylight and lower energy consumption. Therefore, for future projects, and considering new buildings, and retrofit, this research will be an important reference. The research was developed through a case study of an administrative building model, in which the characteristics of solar orientation, light shelf use, glass type, and light and dark colors in walls were modified and combined, deriving it into models proposed. The daylighting performance evaluations were performed through dynamic simulation with the Rhinoceros for Diva software, and the thermal-energetic performance evaluations with the EnergyPlus software. The results of the work showed that a suitable solar orientation has a great impact on the automation of daylight and the energy consumption of the evaluated models, followed by the type of glass and the use of the light colors in internal walls, and that the use of artificial lighting with dimerization is fundamental as a complement to the daylight autonomy. For the boundary conditions of the study, the use of light shelves modified neither the daylight performance nor the thermal-energetic performance of the evaluated models.

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Energy analysis of the daylighting from a double-pane glazed window with enclosed horizontal slats in the tropics

Cited by 15 publications

References 24 publications

Coolfacade

Coolfacade

Environmental Heat Stress on Indoor Environments in Shallow, Deep and Covered Atrium Plan Form Office Buildings in Tropics

Evaluation of Daylighting and Thermo-Energetic Performance in Administrative Building in the South of Brazil

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