Approximation of building window properties using in situ measurements

Feng, Yanxiao; Duan, Qiuhua; Wang, Julian; Baur, Stuart Werner

doi:10.1016/j.buildenv.2019.106590

Cited by 16 publications

(16 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Windows are one of the weakest components in a building. It allows external heat to come inside (enhance the air condition load), internal heat to outside (enhance heating load) and offer visual connection to building interior to exterior [172][173][174][175][176][177][178][179][180][181][182][183][184][185]. Building window systems are affected by an overall heat transfer coefficient (U-value) and solar energy transmittance (g-value) [186][187][188][189].…”

Section: Perspective and Discussionmentioning

confidence: 99%

Status of BIPV and BAPV System for Less Energy-Hungry Building in India—A Review

et al. 2020

View full text Add to dashboard Cite

The photovoltaic (PV) system is one of the most promising technologies that generate benevolent electricity. Therefore, fossil fuel-generated electric power plants, that emit an enormous amount of greenhouse gases, can be replaced by the PV power plant. However, due to its lower efficiency than a traditional power plant, and to generate equal amount of power, a large land area is required for the PV power plant. Also, transmission and distribution losses are intricate issues for PV power plants. Therefore, the inclusion of PV into a building is one of the holistic approaches which reduce the necessity for such large land areas. Building-integrated and building attached/applied are the two types where PV can be included in the building. Building applied/attached PV(BAPV) indicates that the PV system is added/attached or applied to a building, whereas, building integrated PV (BIPV) illustrates the concept of replacing the traditional building envelop, such as window, wall, roof by PV. In India, applying PV on a building is growing due to India’s solar mission target for 2022. In 2015, through Jawaharlal Nehru National Solar Mission, India targeted to achieve 100 GW PV power of which 40 GW will be acquired from roof-integrated PV by 2022. By the end of December 2019, India achieved 33.7 GW total installed PV power. Also, green/zero energy/and sustainable buildings are gaining significance in India due to rapid urbanization. However, BIPV system is rarely used in India which is likely due to a lack of government support and public awareness. This work reviewed the status of BIPV/BAPV system in India. The BIPV window system can probably be the suitable BIPV product for Indian context to reduce the building’s HVAC load.

show abstract

Section: Perspective and Discussionmentioning

confidence: 99%

Status of BIPV and BAPV System for Less Energy-Hungry Building in India—A Review

et al. 2020

View full text Add to dashboard Cite

show abstract

“…This work offers promising results for an easy and precise method to measure window U-factor in-field. However, the testing was repeated for only a south-facing window for three Feng et al [32] developed their own accessible in situ measuring system of building windows based on the fundamentals of the heat flux method and ISO 9869-1. Feng et al used two 3D-printed objects made of acrylonitrile butadiene styrene with known thermal properties, three temperature sensors, and a data logger as their measurement setup, as shown in Figure 18.…”

Section: Heat Flux Meter Methodsmentioning

confidence: 99%

“…Three measurements with various outdoor conditions were taken on a double-pane window with a manufacturer U-factor rating of 2.97 W/m 2 K. The first measurement took place with an indoor temperature of 24.1 °C and outdoor temperature of 6. Feng et al [32] found that the measured U-factor is most accurate when there is at least 15 °C temperature difference between indoor and outdoor conditions. This experiment offers an HFM method that is cheap and accessible.…”

Section: Heat Flux Meter Methodsmentioning

confidence: 99%

“…This measurement was conducted according to ISO 9869. The measured U-factors were compared to known values determined through three methods bulleted below: Feng et al [32] found that the measured U-factor is most accurate when there is at least 15 °C temperature difference between indoor and outdoor conditions. This experiment offers an HFM method that is cheap and accessible.…”

Section: Heat Flux Meter Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Degradation of Insulating Glass Units: Thermal Performance, Measurements and Energy Impacts

2023

View full text Add to dashboard Cite

Insulating glass unit (IGU) degradation has been studied extensively. However, there is limited understanding of how present durability evaluation standards relate to product lifetime. Furthermore, there is debate on how to quantify performance of installed windows over time to better understand degradation processes. More knowledge on these topics is required to link durability evaluation to product lifetime projections based on energy performance. Energy models provide helpful estimations of total annual building energy consumption. However, most models are based on “as installed” performance of envelope components and fail to account for performance degradation. This can lead to an underestimation of building lifetime energy consumption. A better understanding of the relationship between durability and energy performance can inform integration of degradation dynamics into energy modeling software. This will improve lifetime building energy consumption estimations as well as inform appropriate retrofit strategies and timing. This paper reviews current durability literature, various standards for window performance ratings and weathering methods, existing in situ IGU energy performance measurement techniques, and whole-building energy effects. The challenges and disparities among various studies are analyzed and discussed. The authors hope that further work in this area will lead to the development of improved in situ test methods to assess IGU degradation in the field and link this knowledge to improved energy performance modeling approaches.

show abstract

“…Then, the so-called quasi-steady state was assumed to be reached and the average U-factor output via the LCD screen. The detailed explanation of the quasi-steady state and the designed “self-examination” procedure can be found in our previous paper [13] .…”

Section: U-factor Measuring Module Mechanism and Designmentioning

confidence: 99%

Design and development of a low-cost glazing measurement system

Feng

Wang

2020

MethodsX

Self Cite

View full text Add to dashboard Cite

Knowledge of the properties and performance level of a glazing or translucent component system is necessary for assessing the operational energy use of building or greenhouse structures and proposing potential strategies for saving energy. The study of in situ measurements of the thermal and optical performance of glazing systems has not yet been thoroughly examined. To accomplish this task, a portable and easy-to-use in situ measurement system for key glazing properties that uses the inexpensive Arduino platform and compatible sensors was designed, 3D-printed, and fabricated. The glazing properties that can now be measured include the center-of-glass U-factor, solar transmittance, and visible transmittance. In this method-focused paper, we present the step-by-step development procedure in detail, as well as describe the necessary hardware and codes. One can use the shared files to 3D-print the sensor cases and follow the described procedure to achieve the measuring system hardware. Subsequently, the shared codes, including the calibration functions for the associated hardware and the “self-examination” procedure can be applied to achieve a working system for measurement. In brief, this new method is: Based on thermodynamic equations and easy-to-use. Open source, low cost, and simple to assemble. Able to automatically determine the effectiveness of the output via the developed diagnostic algorithms.

show abstract

Approximation of building window properties using in situ measurements

Cited by 16 publications

References 14 publications

Status of BIPV and BAPV System for Less Energy-Hungry Building in India—A Review

Status of BIPV and BAPV System for Less Energy-Hungry Building in India—A Review

Degradation of Insulating Glass Units: Thermal Performance, Measurements and Energy Impacts

Design and development of a low-cost glazing measurement system

Contact Info

Product

Resources

About