Energy conservation using solar collectors integrated with building louver shading devices

Chou, Ding-Chin; Chang, Ching-Shan; Chang, Jui-Chi

doi:10.1016/j.applthermaleng.2015.09.014

Cited by 10 publications

(5 citation statements)

References 18 publications

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“…Another study evaluated the heat pipe solar collector attached on a louver under a range of climatic conditions in the UK [133]. The indoor experimental results showed the performance of the new design to be very promising, even though the collector materials were not carefully selected.…”

Section: (B) Building Applicationsmentioning

confidence: 99%

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Building Applications, Opportunities and Challenges of Active Shading Systems: A State-of-the-Art Review

Dakheel

Aoul

2017

Energies

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Active shading systems in buildings have emerged as a high performing shading solution that selectively and optimally controls daylight and heat gains. Active shading systems are increasingly used in buildings, due to their ability to mainly improve the building environment, reduce energy consumption and in some cases generate energy. They may be categorized into three classes: smart glazing, kinetic shading and integrated renewable energy shading. This paper reviews the current status of the different types in terms of design principle and working mechanism of the systems, performance, control strategies and building applications. Challenges, limitations and future opportunities of the systems are then discussed. The review highlights that despite its high initial cost, the electrochromic (EC) glazing is the most applied smart glazing due to the extensive use of glass in buildings under all climatic conditions. In terms of external shadings, the rotating shading type is the predominantly used one in buildings due to its low initial cost. Algae façades and folding shading systems are still emerging types, with high initial and maintenance costs and requiring specialist installers. The algae façade systems and PV integrated shading systems are a promising solution due to their dual benefits of providing shading and generating electricity. Active shading systems were found to save 12 to 50% of the building cooling electricity consumption.

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Section: (B) Building Applicationsmentioning

confidence: 99%

“…A full-size prototype of solar collector was installed on a shading louver and showed that when the solar radiation was enough, the systems did not require auxiliary heating equipment and the performance was 20% more than the performance of conventional solar collectors with natural circulation function [133].…”

Section: (B) Building Applicationsmentioning

confidence: 99%

Building Applications, Opportunities and Challenges of Active Shading Systems: A State-of-the-Art Review

Dakheel

Aoul

2017

Energies

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“…The refrigerant pressure increases due to heating at a constant volume by the electric heater. The electric heater is used to simulate a parabolic solar collector heat-pipe due to its stable operation [33][34][35][36][37], which can be used to conduct experiments independent of the intensity of the sun. The temperature of the refrigerant inside the storage tank is controlled by a thermostat, such that when the temperature of the refrigerant reaches a predefined set temperature the thermostat shuts down the heater.…”

Section: Methodsmentioning

confidence: 99%

Archives of Thermodynamics

Abd-Elhady,

Melad,

Abd-Elhalim

et al. 2021

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The most power consuming part in the vapor compression cycle (VCC) is the gas compressor. Heating the refrigerant under constant volume after the compressor increases the condenser pressure, which consequently increases the cooling rate of the VCC. This study examined the influence of heating different refrigerants, i.e. R143a, R22, and R600a on the cooling rate of the VCC. Four experiments have been performed: the first experiment is a normal VCC, i.e. without heating, while in the second, third, and fourth experiments were carried out to raise the temperature of the refrigerant to 50 • C, 100 • C, and 150 • C. It has been found that heating raises the refrigerant pressure in VCC and thereby improves the refrigerant's mass flow rate resulting in an improvement in the cooling power for the same compressor power. Heating the refrigerant after the mechanical compressor increases the temperature of the condenser as well as the temperature of the evaporator when using refrigerant R134a, which prevents the refrigeration cycle to be used in freezing applications, however using refrigerant R22 or refrigerant R600a promotes the heated VCC to be used in

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“…Lee, Han andLee (2017), Valladares-Rendón, Schmid, andLo (2017), Valladares-Rendón and Lo (2014) Palmero-Marrero and Oliveira (2010), Kim (2003), Datta (2001), report reduction in insolation level on the whole building envelope and conclude that the use of such devices helps to slow down the heat transfer and reduce the cooling loads. Energy performances of shading systems was demonstrated by Al-Obaidi et al (2017), Xiong andTzempelikos (2016), andLi et al (2016); performance efficiency of a louvre system using solar collectors as an alternative to the conventional shading system was demonstrated by Chou et al (2016) as the outcome shows a 20% higher efficiency, with reduced cooling loads. Bunning and Crawford (2016) compared performance analyses of both internal and external shading devices of offices using EnergyPlus simulation software.…”

Section: Introductionmentioning

confidence: 99%

Between Fancy and Functionality: Comparative Thermal Performance Analyses of Selected External Building Shading Elements in Tropical Building Design

Olaniyan,

Adebisi,

Onigbogi

2023

LAUJOCES

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Tropical region is characterized by high temperature, arising from high solar radiation. Incoming near-infrared energy emanating from excessive direct sunlight leads to increase in the indoor temperature with its attendant indoor thermal discomfort. Thus, there is the need for protection of the interior from this excessive direct heating. One of such protective approaches is the introduction of exterior shading elements to block the incoming solar energy. To achieve this in a typical tropical city of Ogbomoso, Nigeria, several forms of exterior window shading elements are adopted predominantly based on individual preferences, fancies, etc., without scientific consideration for their effectiveness. This study therefore investigated performance effectiveness of each type, with a view to identifying the most effective shading element in the study area. The study adopted the use of multiple/iterative building performance simulation tool, DesignBuilder for evaluating indoor thermal performance of a typical three-bedroom residential building, with regard to four predominantly adopted fixed external shading elements in the study area. Virtual models of five variants of the building were subjected to energy performance simulation analysis, using weather data for Ogbomoso. While the first building tagged Building I was modelled without any shading element, to serve as the control building, the remaining four tagged Building II, Building III, Building IV and Building V were modelled with overhangs, side-fins, hybrids and louvres shading system respectively. Building V recorded highest reduction (56.55%) in the indoor solar gains. This was followed in the order of Building IV (23.90%), Building II (16.00%), and Building III (7.63%). Thus, effectiveness of external louvres system as an external shading device over side-fins and overhangs in the study area could be established. This research is necessary to minimize additional active energy required to reduce the indoor thermal discomfort arising from solar gains (through reduced annual space cooling loads). This will increase building energy efficiency and reduce carbon emissions for overall clean and safe global environment

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Energy conservation using solar collectors integrated with building louver shading devices

Cited by 10 publications

References 18 publications

Building Applications, Opportunities and Challenges of Active Shading Systems: A State-of-the-Art Review

Building Applications, Opportunities and Challenges of Active Shading Systems: A State-of-the-Art Review

Archives of Thermodynamics

Between Fancy and Functionality: Comparative Thermal Performance Analyses of Selected External Building Shading Elements in Tropical Building Design

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