Investigation of the relationship between the allowable transparent area, thermal mass and air change rate in buildings

Csáky, Imre; Kalmár, Ferenc

doi:10.1016/j.jobe.2017.05.002

Cited by 13 publications

(7 citation statements)

References 23 publications

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“…The use of TM can be effective in reducing the total amount of energy and maintaining the thermal comfort levels for the users [23,26,[30][31][32]. TM is the most functional in hot weather when outdoor temperatures soar sharply [31] or in hot summer in cooler regions [25,26,28,[33][34][35]. Kumar [36] argued that the use of thermal mass is not beneficial only in summer but also in the composite climate of India in winter.…”

Section: Significance Of Thermal Mass In Buildingsmentioning

confidence: 99%

User Thermal Comfort in Historic Buildings: Evaluation of the Potential of Thermal Mass, Orientation, Evaporative Cooling and Ventilation

et al. 2020

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The study investigated the level of thermal comfort in historical buildings located at a relatively high altitude in the Arabian Desert of Saudi Arabia. The study focused on the impact of the use of thermal mass and orientation on the level of thermal performance at Shubra and Boqri Palaces. Qualitative and quantitative analyses were used in this study, including a questionnaire interview with architecture experts living at the relatively high altitude of Taif city, to obtain data and information from local experts. The computer software TAS EDSL was used along with on-site equipment, such as thermal imaging cameras and data loggers, to observe the physical conditions of the building in terms of its thermal performance. The study revealed that the experts’ age and years of experience were important aspects while collecting data from them during the survey. The use of thermal mass had a slight impact on the indoor air temperature as well as the energy consumption, but it helped in providing thermal comfort. Use of ventilation can improve thermal comfort level. Evaporative cooling technique has a considerable impact on reducing indoor air temperature with 4 °C drop, improving the thermal comfort sensation level. The novelty of this work is that, it links the outcomes of qualitative results of experts with field monitoring as well as computer modelling. This can contribute as method to accurately collect data in similar case studies.

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Section: Significance Of Thermal Mass In Buildingsmentioning

confidence: 99%

User Thermal Comfort in Historic Buildings: Evaluation of the Potential of Thermal Mass, Orientation, Evaporative Cooling and Ventilation

et al. 2020

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“…A method to decrease the energy use as well as the emission of greenhouse gases is to apply thermal insulation materials. [1][2][3][4] Silica aerogels are mesoporous materials that have very small thermal conductivity (λ, W/mK) [5]. Aerogel materials are applied as thermal excellent insulations.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Heat Treatment in the Properties of Fibrous Aerogel Thermal Insulation

et al. 2019

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Nowadays, besides the use of conventional insulations (plastic foams and wool materials), aerogels are one of the most promising thermal insulation materials. As one of the lightest solid materials available today, aerogels are manufactured through the combination of a polymer with a solvent, forming a gel. For buildings, the fiber-reinforced types are mainly used. In this paper, the changes both in the thermal performance and the material structure of the aerogel blanket are followed after thermal annealing. The samples are put under isothermal heat treatments at 70 °C for weeks, as well as at higher temperatures (up to 210 °C) for one day. The changes in the sorption properties that result from the annealing are presented. Furthermore, the changes in the thermal conductivity are followed by a Holometrix Lambda heat flow meter. The changes in the structure and surface of the material due to the heat treatment are investigated by X-ray diffraction and with scanning electron microscopy. Besides, the above-mentioned measurement results of differential scanning calorimetry experiments are also presented. As a result of using equipment from different laboratories that support each other, we found that the samples go through structural changes after undergoing thermal annealing. We manifested that the aerogel granules separate down from the glass fibers and grow up. This phenomenon might be responsible for the change in the thermal conductivity of the samples.

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“…The use of thermal mass (TM) can be classified into two major combinations: internal insulation (for instance, the existence of furniture) and external insulation (such as walls, roof, and floor) [39]. The use of thermal mass can be efficacious in the constriction of energy use and maintenance of comfort level [40][41][42][43][44]. In fact, thermal comfort might be considered the most appropriate aspect in hot regions [45], or during a warm summer in countries with milder climates [40,46,47].…”

Section: Thermal Mass and Its Influence On Underground Constructionsmentioning

confidence: 99%

Use of Underground Constructions Enhanced with Evaporative Cooling to Improve Indoor Built Environment in Hot Climate

Alwetaishi

2021

Buildings

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Underground constructions (UGCs) have been used globally to accommodate a wide range of building usage, such as offices and shopping malls. Most of these constructions suffer from a lack of natural ventilation as well as daylight, as they are completely built under the surface of the earth. This has caused many issues related to discomfort, impacting the activity and the productivity of users. This study aimed to analyse the effect of the use of UGCs in hot regions, enhanced by partly elevated external walls which reach aboveground to ensure natural ventilation and daylight, with relatively small amounts of glazing to minimise the influence of solar heat gain. The study used a real built underground room with field measurements for indoor temperature and relative humidity. Moreover, the study used the computer tool EDSL TAS to simulate the performance of the model throughout the year after a field validation. It was concluded that the use of UGCs in hot climates should be encouraged as natural ventilation and daylight can decrease temperatures by 3 °C in summer, and the utilisation of evaporative cooling can cool the indoor environment by nearly 12 °C. Furthermore, heat transfer was highly affected by the external environment. It was found that the amount of heat transfer doubled in comparison between under and aboveground constructions. The use of small windows for ventilation caused high humidity, even in hot regions, during summer.

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Investigation of the relationship between the allowable transparent area, thermal mass and air change rate in buildings

Cited by 13 publications

References 23 publications

User Thermal Comfort in Historic Buildings: Evaluation of the Potential of Thermal Mass, Orientation, Evaporative Cooling and Ventilation

User Thermal Comfort in Historic Buildings: Evaluation of the Potential of Thermal Mass, Orientation, Evaporative Cooling and Ventilation

Effects of the Heat Treatment in the Properties of Fibrous Aerogel Thermal Insulation

Use of Underground Constructions Enhanced with Evaporative Cooling to Improve Indoor Built Environment in Hot Climate

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