The Potential of Shading Devices for Temperature Reduction in High-Rise Residential Buildings in the Tropics

Al-Tamimi, Nedhal; Fadzil, Sharifah Fairuz Syed

doi:10.1016/j.proeng.2011.11.2015

Cited by 105 publications

(61 citation statements)

References 17 publications

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“…This energy can be significantly reduced owing to shading devices. Many researchers have demonstrated the efficiency of such measures through simulations [32,36]. A simulation study in southern Italy, Analysing the results presented for sunny days (Figure 17a-c), it can be concluded that despite highly uncomfortable (unfavourable) thermal conditions in the room, user behaviour can improve the comfort experienced.…”

Section: Discussionmentioning

confidence: 95%

“…This energy can be significantly reduced owing to shading devices. Many researchers have demonstrated the efficiency of such measures through simulations [32,36]. A simulation study in southern Italy, presented in [37], showed the possibility of reducing energy consumption for cooling purposes in highly glazed office rooms with external roller blinds by nearly 50%, compared to rooms with no external roller blinds installed.…”

Section: Discussionmentioning

confidence: 99%

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Analysis of the Effect of Using External Venetian Blinds on the Thermal Comfort of Users of Highly Glazed Office Rooms in a Transition Season of Temperate Climate—Case Study

2019

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Improving the energy efficiency of buildings is among the most urgent social development tasks due to the scale of energy consumption in this industry. At the same time, it is essential to meet high requirements for indoor environmental quality and thermal comfort. The issue of overheating is most often analysed in summer but it also occurs in transition seasons, when the cooling systems do not operate. The paper attempts to evaluate the effectiveness of external mobile shading elements on the microclimate of rooms with large glazed areas in the transition season. Passive solutions, such as shading elements, which limit the increase of indoor temperature, do not always allow the acquisition and maintenance of comfortable solutions for the duration of the season, as demonstrated by the authors. Temporary cooling of the rooms may be necessary to maintain comfortable conditions for the users, or other solutions should be devised to improve comfort (e.g., reduction of clothing insulation characteristics). The novelty of the study consists in the analysis of comfort in a "nearly zero energy consumption" building (NZEB) during a period not analyzed by other scientists. This is a transition period during which heating/cooling systems do not operate. The research task set by the authors involved the assessment of the possibility to reduce office space overheating in the transition season (spring) by using external shading equipment in rooms with large glazed areas. An additional research task aimed at checking the extent to which user behaviour, such as reduction in clothing insulation characteristics, can improve comfort in overheated rooms. The results of the tests reveal that the difference in the ambient air temperature between a room with external venetian blinds and an identical room with no venetian blinds in the transition season, i.e., from 27 March to 6 April 2017, ranged from 12.3 to 2.1 • C. The use of a shading system (external venetian blinds positioned at an angle of 45 • ) reduced the number of discomfort hours by 92% (during working hours) compared to the room without external venetian blinds. A reduction in the thermal insulation of the clothes worn by people working in the room with no venetian blinds helped to reduce the number of discomfort hours by 31%.

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Section: Discussionmentioning

confidence: 95%

“…This energy can be significantly reduced owing to shading devices. Many researchers have demonstrated the efficiency of such measures through simulations [32,36]. A simulation study in southern Italy, presented in [37], showed the possibility of reducing energy consumption for cooling purposes in highly glazed office rooms with external roller blinds by nearly 50%, compared to rooms with no external roller blinds installed.…”

Section: Discussionmentioning

confidence: 99%

Analysis of the Effect of Using External Venetian Blinds on the Thermal Comfort of Users of Highly Glazed Office Rooms in a Transition Season of Temperate Climate—Case Study

2019

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“…The target building has 40% windows (i.e., 494 m 2 ) facing South, where the case combines the proposed system with a smart shading system. Traditional solar shadings can only save energy for the cooling system and even may have negative impacts on energy consumption for both lighting and heating systems [52][53][54], where the reason is the fixed shading facilities may reduce solar radiation for daylighting and heating [54]. Therefore, a smart shading system can help occupants to keep a balance between indoor illumination and temperature.…”

Section: Feasibility Analysismentioning

confidence: 99%

An NNwC MPPT-Based Energy Supply Solution for Sensor Nodes in Buildings and Its Feasibility Study

Chang

Wang

et al. 2018

Energies

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Sensors for data collecting are vital in the development of IoT and intelligent systems. High power consuming current and voltage monitors are indispensable in conducting maximum power point tracking (MPPT) in traditional PV energy wireless sensor nodes. This paper presents a sensor node system based on Neural Network MPPT with cloud method (NNwC) which utilizes information sharing process that is specific to sensor networks. NNwC uses a few sample sensor nodes to collect environmental parameter data such as light intensity (L) and temperature (T) to build the MPPT regression model by Neural Network. Then all other functional sensor nodes implement the model with their environmental parametervalues to conduct MPPT. As a result, the new sensor node system reduces energy consumption as well as the size and cost of the harvester. Then, this paper provides a SPICE simulation to estimate the percentage of power consumption reduced in the new sensor node system and also estimates the percentage of loss in neural network MPPT power generation compared with the perfect MPPT. Finally, the study compares the economic and environmental performance of the proposed system and the traditional ones through a case in a real building situation.Energies 2019, 12, 101 2 of 20 of pervasive and massive. Another solution employs the self-energized PV wireless sensor nodes [1,2] for power generation from solar energy. These systems commonly use batteries or supercapacitors for energy storage to maintain the continuous operation of sensor nodes. However, due to the limited PV conversion efficiency, this design requires large-size PV panels to generate enough energy for sensor nodes. These large-size sensor nodes will not only alter original environmental factors but also restrict their distribution range, and then, reduce the reliability of data collected by the sensors.Maximum power point tracking (MPPT) algorithms, a technique for increasing the output of the solar panel in a given size, is a promising solution to the energy storage problem in sensor node systems. However, MPPT requires voltage and current monitors to acquire the real-time power output of the harvester. Sensor node is a kind of low energy consumption application. In order to acquire more precise voltage and current parameters, the monitor components insulated with original output circuit should be adopted because they can obtain the voltage and current data without affecting the original values. The Hall Effect-Based Current/Voltage Monitors such as CSM series and VSM series are suitable for high accuracy current and voltage data collecting. However, the monitors, especially current monitors, not only have a high initial cost [3] but also require relatively large power support according to the load [4]. As the result, these sensors are commonly designed with space-consuming solar panels to avoid the interruption of sensors. To address such problem, there is a strong demand for a new wireless solar energy harvester for sensor node network systems with a higher conversi...

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“…Therefore, the most effective way to reduce the solar load on the openings is to intercept direct solar radiation before it reaches the glass [8,10] to control the indoor temperature, improve thermal comfort and reduce cooling loads [11][12][13] . Consequently, fully shaded openings during hot weather can reduce solar heat gain by as much as 80% [1,10,11] .…”

Section: Figmentioning

confidence: 99%

“…Consequently, fully shaded openings during hot weather can reduce solar heat gain by as much as 80% [1,10,11] . A considerable amount of literature has been published on the importance of the shading techniques in different regions, some with the same climatic conditions as Egypt.…”

Section: Figmentioning

confidence: 99%

Thermal Behaviour Assessment For The Different Building Envelope Parts In Egypt Under Climate Change Scenarios

Mahdy

Barakat

2017

Eng. Sci. and Milit. Techno.

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This paper presents a comprehensive evaluation for (of) the results of a recent research effort concerning thermal comfort in residential buildings in Egypt. The energy performance and thermal comfort were considered based on the instructions of the Egyptian Residential Energy Code (EREC) to improve the efficiency of energy use. The conclusions of the aforementioned research on the building envelope (walls / fenestration) were tested together to make sure (prove or demonstrate or verify) that the use of what seems to be the best solutions for external walls (solid part) in addition to the best solutions for fenestration (openings), will results result in a better overall performance in energy consumption and thermal comfort, than (when) implementing (only) one of the two choices. To attain that, two (mixed-mood) [heating, ventilation and air conditioning (HVAC)] case study buildings were dynamically simulated in three dominant Egyptian climatic zones, using current climate conditions (2002) in addition to three other morphed climate change scenarios (2020, 2050 and 2080). Achieving the required rates for thermal comfort, and acquiring (securing) long term financial gains were the basic elements of the evaluation. The results provide what seems to be a functionally and financially successful combination to fulfil the evaluation elements.

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The Potential of Shading Devices for Temperature Reduction in High-Rise Residential Buildings in the Tropics

Cited by 105 publications

References 17 publications

Analysis of the Effect of Using External Venetian Blinds on the Thermal Comfort of Users of Highly Glazed Office Rooms in a Transition Season of Temperate Climate—Case Study

Analysis of the Effect of Using External Venetian Blinds on the Thermal Comfort of Users of Highly Glazed Office Rooms in a Transition Season of Temperate Climate—Case Study

An NNwC MPPT-Based Energy Supply Solution for Sensor Nodes in Buildings and Its Feasibility Study

Thermal Behaviour Assessment For The Different Building Envelope Parts In Egypt Under Climate Change Scenarios

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