Measuring the effects of heated windows on thermal comfort

Cakó, Balázs; Lovig, Dalma; Ózdi, András

doi:10.1556/606.2021.00361

Cited by 7 publications

(4 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Comparative measurements of air temperature and black globe temperature in a room with the heated glazing, and in a room with conventional triple glazing show an increase in operative temperature, as would be expected based on theory and in line with the findings of [4]. Conversely, the air temperature may be lowered when the heated glass element is used, to an extent at which a comfortable operative temperature is still achieved.…”

Section: Discussionsupporting

confidence: 81%

“…A novel heated glass element has been developed, allowing for the control of the interior surface temperature of glazing, thereby improving thermal comfort through influencing the mean radiant temperature. Cakó et al [4] conducted measurements of thermal comfort near (1 -2 metres) a heated glass element, and found that the predicted mean vote (PMV) indeed improves with the use of heated glazing, the magnitude of which of course depends strongly on the realized glass surface temperature.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermal characterization of a novel heated glass element

Rovers,

Van ‘t Ende,

Gieling

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Although the U-value of glazing has improved significantly in the last decades, the thermal transmittance of windows remains relatively high compared to opaque elements of the thermal shell. Consequently, glazing has a relatively low interior surface temperature in the heating season, which can cause thermal discomfort. A novel heated glass element has been developed, allowing for the control of its interior surface temperature. In-situ measurements were conducted on a heated glass element, with the objective to (i) characterize its thermal behaviour, (ii) assess its thermal performance and (iii) to assess its impact on thermal comfort. The examination of heating-up and cooling-down curves of the heated glass element revealed that cooling-down is a slower process (τ2 of 100 – 145 minutes) than heating-up (τ2 of 70-85 minutes). In terms of thermal performance, it is shown that most of the heat provided by the heated glass element is effectively directed towards the room, rather than lost to the outdoor environment. The efficiency depends on the temperature difference between interior glass surface and the room, with efficiencies of 58 – 65% reached at surface temperatures of 23 - 25 °C, and efficiencies of 90% reached at surface temperatures of 39 – 43 °C. Comparative measurements of thermal comfort in a room with the heated glazing, and in a room with conventional triple glazing show an improvement in operative temperature.

show abstract

Section: Discussionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Thermal characterization of a novel heated glass element

Rovers,

Van ‘t Ende,

Gieling

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…Thanks to the glazing control unit, the surface temperature could be adjusted by users based on their preferences. It was concluded that the application of electrically heated glazing would be capable of enhancing indoor thermal comfort [97]. In a hot, semi-arid climate, the application of thermochromic glazing showed a contribution to a reduction in the indoor temperature from 42 • C (in the presence of a typical single glazing) to 33 • C in the summer, resulting in a thermal comfort improvement.…”

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

View full text Add to dashboard Cite

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.

show abstract

“…Moreau et al [24] developed a building energy analysis model for heated glazing and found that energy saving was possible via the installation of heated glazing on the northern or eastern sides, contrary to the expectation that heated glazing would increase building energy consumption. Cakó et al [25] researched thermal comfort according to the measured distance from heated glazing using predicted mean vote measurements and an experimental manikin, and found that the dissatisfaction index was less than 5% when the surface temperature was present approximately 40 • C or higher. Furthermore, Kaboré et al [26] emphasized the various benefits of heated glazing and proved its ability to reduce heating energy by up to 13% through experiments.…”

Section: Introductionmentioning

confidence: 99%

Heat Flux and Thermal Characteristics of Electrically Heated Windows: A Case Study

et al. 2022

View full text Add to dashboard Cite

Energy loss through windows can be high relatively compared to other opaque surfaces because insulation performance of fenestration parts is lower in the building envelope. Electrically heated window systems are used to improve the indoor environment, prevent condensation, and increase building energy efficiency. The purpose of this study is to analyze the thermal behaviors of a heated window under a field experiment condition. Experiments were conducted during the winter season (i.e., January and February) with the energy-efficient house that residents occupy. To collect measured data from the experimental house, temperature and heat flux meter sensors were used for the analysis of heat flow patterns. Such measured data were used to calculate heat gain ratios and compare temperature and dew point distribution profiles of heated windows with input power values under the changed condition in the operating temperature of the heated glazing. Results from this study indicated that the input average heat gain ratio was analyzed to be 75.2% in the south-facing and 83.8% in the north-facing at nighttime. Additionally, compared to January, reducing the operating temperature of the heated glazing by 3 °C decreased the input energy in February by 44% and 41% for the south-facing and north-facing windows, respectively. Through such field measurement study, various interesting results that could not be found in controlled laboratory chamber conditions were captured, indicating that the necessity of establishing various control strategies should be considered for the development and commercialization of heated windows.

show abstract

Measuring the effects of heated windows on thermal comfort

Cited by 7 publications

References 8 publications

Thermal characterization of a novel heated glass element

Thermal characterization of a novel heated glass element

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

Heat Flux and Thermal Characteristics of Electrically Heated Windows: A Case Study

Contact Info

Product

Resources

About