Tailored WBGT as a heat stress index to assess the direct solar radiation effect on indoor thermal comfort

Mirzabeigi, Shayan; Nasr, Behrooz Khalili; Mainini, Andrea Giovanni; Cadena, Juan Diego Blanco; Lobaccaro, Gabriele

doi:10.1016/j.enbuild.2021.110974

Cited by 13 publications

(6 citation statements)

References 16 publications

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“…), solar radiation falling over the occupant's body plays an important role in the thermal sensation of a user in an indoor space. Although dynamic simulations typically account for solar radiation, the impact of solar radiation directly falling on the occupant is often overlooked in various comfort models [103,104]. The thermal comfort conditions around glazing areas can differ considerably from those in the center of rooms, depending on factors such as the exposure of the glazing to solar radiation, the geometry of the space, and the ratio between the glazing area and the floor area.…”

Section: Impacts Of Glazing Systems On Buildings' Thermal Comfortmentioning

confidence: 99%

“…In this method, several factors, such as solar radiation distribution, surrounding context, direct and indirect solar transmittance of the window system, occupant position and posture, body exposure, sun position, irradiance value, and clothing absorptivity, were considered. Therefore, the mean radiant temperature (MRT) is adjusted by summing up the contributions of the calculated longwave and shortwave MRT [103,104]. A public online tool named "SolarCal" incorporated the aforementioned method that can be used to determine the temperature offset for the affected occupants cooling and the allowable transmittance of glazing systems in a perimeter office [103].…”

Section: Impacts Of Glazing Systems On Buildings' Thermal Comfortmentioning

confidence: 99%

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Comprehensive Review and Analysis of Glazing Systems towards Nearly Zero-Energy Buildings: Energy Performance, Thermal Comfort, Cost-Effectiveness, and Environmental Impact Perspectives

Moghaddam,

Serra,

Gameiro da Silva

et al. 2023

Energies

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The global interest in nearly zero-energy buildings (NZEBs) has led to their establishment as mandatory building objectives in Europe for all new constructions starting in 2021. The principles outlined in the Energy Performance of Building Directive (EPBD) emphasize the significance of reducing energy demand through various energy efficiency measures to achieve NZEB status. Among these measures, the utilization of high-performance glazing systems plays a crucial role in ensuring natural light, ventilation, favorable solar gain, aesthetics, and positive psychological effects in buildings, while maintaining high energy performance and thermal comfort without burdening the budget or harming the environment. The use of increasingly larger glazing areas makes this topic of great relevance. Nevertheless, numerous studies frequently overlook certain crucial aspects of glazing systems in their assessments. This review study aims to assess different glazing solutions based on four critical perspectives called “EThCE”: Energy performance, thermal comfort, cost-effectiveness, and environmental impact, considering their interrelationships. Furthermore, the importance of adopting a comprehensive approach for selecting the optimal glazing solution for NZEBs is discussed. Additionally, the relationship between glazing systems and climate change is taken into account. Ultimately, the authors propose a comprehensive approach, including all the influential factors, to assist designers and homeowners in making informed decisions regarding glazing system selection for new NZEBs or NZEB retrofits in different situations.

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Section: Impacts Of Glazing Systems On Buildings' Thermal Comfortmentioning

confidence: 99%

Section: Impacts Of Glazing Systems On Buildings' Thermal Comfortmentioning

confidence: 99%

Comprehensive Review and Analysis of Glazing Systems towards Nearly Zero-Energy Buildings: Energy Performance, Thermal Comfort, Cost-Effectiveness, and Environmental Impact Perspectives

Moghaddam,

Serra,

Gameiro da Silva

et al. 2023

Energies

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“…WBGT is a comprehensive evaluation index of thermal stress that covers thermal environment factors such as temperature, humidity, radiation, and wind speed (Institution 1982). Compared to the PMV index used as a control index, WBGT can overcome the limitation of considering the effect of outdoor solar radiation, therefore WBGT is recommended for indoor and outdoor comfort analysis (Mirzabeigi et al 2021). In this investigation, we use WBGT to determine human thermal comfort conditions in a naturally ventilated environment.…”

Section: Determination Of Control Indicatorsmentioning

confidence: 99%

The alternate operation control strategy between natural ventilation and air-conditioning considering delay time

et al. 2022

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Most research in the field of indoor thermal environment control has been devoted to the search for an appropriate on/off temperature of air-conditioning while relatively ignoring the energy-saving effect of the transition period length after air-conditioning turned off. We proposed a control model for the alternate operation between natural ventilation and air-conditioning to measure the delay time of natural ventilation after air-conditioning turned off. We compared the energy consumption of two cooling modes (continuous cooling and alternative operation between natural ventilation and air-conditioning) in different thermal capacity buildings in China’s hot summer and warm winter areas. Furthermore, we obtain the delay time of natural ventilation under different thermal capacity buildings. The results indicate that buildings with more thermal capacity have a greater delay time of natural ventilation. Alternative operation strategy can save at least 15% energy consumption compared with continuous air-conditioning cooling. The results are helpful to guide residents to adjust their use habits of air-conditioning according to the delay time of natural ventilation and to alleviate the pressure of air conditioning energy consumption in hot summer and warm winter areas in China.

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“…ISO 7726 [23], ISO 7933 [24], and ISO 7243 [25] regulations standardize the methods for defining and measuring a heat stress index. The most used parameter to measure heat stress is the wet-bulb globe temperature (WBGT) [26,27]. Other commonly used indices are the Predicted Heat Strain (PHS) [28], the Universal Thermal Climate Index (UTCI) [29], the Tropical Summer Index (TSI), and the Thermal Working Limit (TWL).…”

Section: Introductionmentioning

confidence: 99%

Measuring Heat Stress for Human Health in Cities: A Low-Cost Prototype Tested in a District of Valencia, Spain

Aduna-Sánchez,

Correcher,

Alfonso-Solar

et al. 2023

Sensors

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Nowadays, the measurement of heat stress indices is of principal importance due to the escalating impact of global warming. As temperatures continue to rise, the well-being and health of individuals are increasingly at risk, which can lead to a detrimental effect on human performance and behavior. Hence, monitoring and assessing heat stress indices have become necessary for ensuring the safety and comfort of individuals. Thermal comfort indices, such as wet-bulb globe temperature (WBGT), Tropical Summer Index (TSI), and Predicted Heat Strain (PHS), as well as parameters like mean radiant temperature (MRT), are typically used for assessing and controlling heat stress conditions in working and urban environments. Therefore, measurement and monitoring of these parameters should be obtained for any environment in which people are constantly exposed. Modern cities collect and publish this relevant information following the Smart City concept. To monitor large cities, cost-effective solutions must be developed. This work presents the results of a Heat Stress Monitoring (HSM) system prototype network tested in the Benicalap-Ciutat Fallera district in Valencia, Spain. The scope of this work is to design, commission, and test a low-cost prototype that is able to measure heat stress indices. The Heat Stress Monitoring system comprises a central unit or receiver and several transmitters communicating via radiofrequency. The transmitter accurately measures wind speed, air temperature, relative humidity, atmospheric pressure, solar irradiation, and black globe temperature. The receiver has a 4G modem that sends the data to an SQL database in the cloud. The devices were tested over one year, showing that radio data transmission is reliable up to 700 m from the receiver. The system’s power supply, composed of a Photovoltaic panel and Lithium-ion batteries, provided off-grid capabilities to the transmitter, with a tested backup autonomy of up to 36 days per charge. Then, indicators such as WBGT, TSI, and MRT were successfully estimated using the data collected by the devices. The material cost of a 12-point network is around EUR 2430 with a competitive price of EUR 190 per device.

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Tailored WBGT as a heat stress index to assess the direct solar radiation effect on indoor thermal comfort

Cited by 13 publications

References 16 publications

Comprehensive Review and Analysis of Glazing Systems towards Nearly Zero-Energy Buildings: Energy Performance, Thermal Comfort, Cost-Effectiveness, and Environmental Impact Perspectives

Comprehensive Review and Analysis of Glazing Systems towards Nearly Zero-Energy Buildings: Energy Performance, Thermal Comfort, Cost-Effectiveness, and Environmental Impact Perspectives

The alternate operation control strategy between natural ventilation and air-conditioning considering delay time

Measuring Heat Stress for Human Health in Cities: A Low-Cost Prototype Tested in a District of Valencia, Spain

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