Usage of solar shading devices to improve the thermal comfort in summer in a Romanian PassivHaus

Udrea, Ioana; Badescu, Viorel

doi:10.1177/0037549719887790

Cited by 10 publications

(6 citation statements)

References 38 publications

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“…One of the obvious reasons for this was that about half of the survey respondents were seated at locations near to the windows and their sensations were recorded during the warmer time (around 1,300 to 1,500 h) of the day. The type of façade system and shading devices used in these spaces may have contributed to this result, as it was found that the type of shading could potentially affect thermal comfort and space cooling capacity (Udrea and Badescu, 2020). However, a contradicting result was obtained at which most of the occupants seated at this location found their thermal environment acceptable because they voted within the three central ratings (−1, 0, +1).…”

Section: Discussionmentioning

confidence: 99%

Post occupancy evaluation of thermal comfort and indoor air quality of office spaces in a tropical green campus building

Yong

Kwong

Ong

et al. 2021

JFM

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Purpose As suggested in many previous studies, good thermal comfort and indoor air quality (IAQ) played a significant role in ensuring human comfort, health and productivity in buildings. Hence, this study aims to evaluate the thermal comfort and IAQ conditions of open-plan office areas within a green-certified campus building through a post occupancy evaluation. Design/methodology/approach Using the field measurement method, environmental dataloggers were positioned at three office areas during office hours to measure the levels of thermal comfort parameters, CO2 concentrations and the supply air rates. At the same time, questionnaires were distributed to the available office staff to obtain their perception of the indoor environment. The findings were then compared with the recommended environmental comfort ranges and used to calculate the thermal comfort indices. Findings Results show that the physical parameters were generally within acceptable ranges of a local guideline. The neutral temperature based on the actual mean vote at these areas was 23.9°C, which is slightly lower than the predicted thermal neutrality of 25.2°C. From the surveyed findings, about 81% of the occupants found their thermal environment comfortable with high adaptation rates. A preference for cooler environments was found among the workers. Meanwhile, the air quality was perceived to be clean by a majority of the respondents, and the mean ventilation rate per person was identified to be sufficient. Research limitations/implications This study focussed on the thermal environment and air quality at selected office spaces only. More work should be carried out in other regularly occupied workplaces and study areas of the green educational building to allow a more thorough analysis of the indoor air conditions. Practical implications This paper highlights on the thermal comfort and air quality conditions of the air-conditioned office spaces in a green-certified campus building and is intended to assist the building services engineers in effective air conditioning control. The findings reported are useful for thermal comfort, IAQ and subsequently energy efficiency improvements in such building type where adjustments on the air temperature set-point can be considered according to the actual requirements. This study will be extended to other green campus spaces for a more exhaustive analysis of the indoor environment. Originality/value There is limited information pertaining to the environmental comfort levels in offices of green campus in the tropics. This study is, therefore, one of the earliest attempts to directly explore the thermal comfort and IAQ conditions in such workplace using both on-site physical measurement and questionnaire survey.

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Section: Discussionmentioning

confidence: 99%

Post occupancy evaluation of thermal comfort and indoor air quality of office spaces in a tropical green campus building

Yong

Kwong

Ong

et al. 2021

JFM

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“…In tropical climates, the main strategy entails cooling and dehumidification [30]; in China, the use of an mechanical ventilation with heat recovery ( MVHR) system is essential [31], and for all types of climates in Germany, Romania, and Ukraine, energy demand increases as latitude increases, so this strategy aims to increase insulation levels based on location [32]. On the other hand, studies show that to achieve PH, it is necessary to place special emphasis on summer overheating and on shading strategies to achieve thermal comfort [33]. Given the outlined context, this study suggests incorporating the PH standard for housing in Chile through the addition of building construction improvements for housing situated across the country and reflecting various climates.…”

Section: Methodsmentioning

confidence: 99%

Energy, Economic, and Environmental Performance of a Single-Family House in Chile Built to Passivhaus Standard

et al. 2021

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The energy consumption of buildings accounts for 22% of total global energy use and 13% of global greenhouse gas emissions. In this context, this study aims to evaluate the energy, economic, and environmental performance of housing in Chile built according to the Passivhaus (PH) standard. The standard was applied to housing in eight representative climate zones with a single-family residence as reference. The analysis incorporated passive strategies, which are considered as pillars of the PH. The energy performance was analyzed using the Passive House Planning Package software (PHPP), version 9.6a. The results showed that when every passive strategy is implemented, the heating energy demand decreases by 93%, while the refrigeration demand is nonexistent. These results were achieved through a 37% increase in the overall initial budget investment, which will be amortized over an 11-year period. In this way, the primary energy consumption is reduced by 32% and, correspondingly, CO2 emissions are reduced by 39%. In modern Chile, it is difficult (but not impossible) to incorporate PH. However, governmental programs and aids could represent an initial step. Therefore, this research will help to identify strategies for incorporating PH in Chile, with the aim of improving the energy performance of housing.

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“…In addition, more suitable building materials can be used to alleviate summer overheating, but it is not applicable to buildings that have been put into use. The existing research by Udrea et al [26] and Sun et al [27] showed that the building shading design can effectively alleviate the phenomenon of overheating in summer, and has the advantages of being economical, wide applicability, and high comfort. Because the external shading devices of the building can block the solar radiation outdoors, the shading effect is better than the internal shading devices effect [28], and there is no need for human control.…”

Section: Introductionmentioning

confidence: 99%

The Use of Horizontal Shading Devices to Alleviate Overheating in Residential Buildings in the Severe Cold Region and Cold Region of China

Chang

et al. 2022

Buildings

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Global warming is resulting in higher summer indoor temperatures in the severe cold region and cold region of China, and this is affecting thermal comfort. Local building design codes consider these regions as cool in summer, and do not consider the phenomenon of overheating or propose countermeasures. This paper studied the possibility of overheating in residential buildings in these areas. It suggested alleviating this phenomenon using external horizontal shading, and discussed how to integrate thermal comfort into the building design and save energy consumption. The IESVE software was used to simulate 18-storey residential buildings with natural ventilation in Yichun, Harbin, Shenyang, Dalian, and Beijing, and to calculate the change in indoor operative temperature. Horizontal shading was designed for case study building to attempt to alleviate the overheating phenomenon in summer. The results showed that the case study building in the five cities experienced different degrees of overheating. External horizontal shading was successful in reducing indoor overheating, especially in the severe cold B and C zones and the cold A and B zones. The relevant building codes should be modified to take this into account. Reasonable design of horizontal shading can effectively reduce energy consumption, particularly when compared with air-conditioned buildings.

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Usage of solar shading devices to improve the thermal comfort in summer in a Romanian PassivHaus

Cited by 10 publications

References 38 publications

Post occupancy evaluation of thermal comfort and indoor air quality of office spaces in a tropical green campus building

Post occupancy evaluation of thermal comfort and indoor air quality of office spaces in a tropical green campus building

Energy, Economic, and Environmental Performance of a Single-Family House in Chile Built to Passivhaus Standard

The Use of Horizontal Shading Devices to Alleviate Overheating in Residential Buildings in the Severe Cold Region and Cold Region of China

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