Mitigating office performance uncertainty of occupant use of window blinds and lighting using robust design

O’Brien, William; Gunay, H. Burak

doi:10.1007/s12273-015-0239-2

Cited by 48 publications

(17 citation statements)

References 57 publications

(64 reference statements)

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“…The upper threshold was used to ensure an enough large buffer zone in which the blind did not operate, given the high shading factor of the installed screen (which has a 5% visible transmittance). According to O'Brien and Gunay, 50% probability of blind close was set to 5700 lux on the work plane in a Monte Carlo simulation for an occupant-behaviour model of office users [33]. Haldi and Robinson investigated the blind pattern use in an office building in Lausanne and found that a 1200 lux illuminance level triggered a maximum frequency for lowering the blinds [34].…”

Section: Limitations and Discussionmentioning

confidence: 99%

Automatic vs Manual Control Strategy for Window Blinds and Ceiling Lights: Consequences to Perceived Visual and Thermal Discomfort

Lolli

Nocente

Brozovsky

et al. 2019

Journal of Daylighting

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A case study to evaluate the occupants' satisfaction in relation to two different control strategies (fully automatic and manual) for blind and ceiling lights use in cell offices was carried on in Trondheim, Norway. A group of 11 participants with varying age, gender, and ethnicity, used two test cells of a laboratory as a workspace primarily carrying out office tasks at a personal computer for a total of 19 calendar days. The participants were asked to answer a computer-based questionnaire for reporting their perceived thermal and visual comfort. Concurrently, measurements of the indoor operative temperature, illuminance level, and operation of windows, blinds, and ceiling lights were registered. Results shows that the use of the automatic control strategy led to a higher visual discomfort, which in addition led to a higher thermal discomfort, despite this last not caused by a higher average operative temperature.

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Section: Limitations and Discussionmentioning

confidence: 99%

Automatic vs Manual Control Strategy for Window Blinds and Ceiling Lights: Consequences to Perceived Visual and Thermal Discomfort

Lolli

Nocente

Brozovsky

et al. 2019

Journal of Daylighting

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show abstract

“…To have a percentage value of total energy uncertainty rather than an absolute one, these lower and upper bounds were further divided by the mean value. The robustness of building energy performance is an important factor influencing building design (Brien and Gunay 2015). A robust design tries to achieve design parameters that are more resilient to uncertain operating conditions and are less sensitive to occupant behavior.…”

Section: Energy Performancementioning

confidence: 99%

Energy uncertainty of manual solar shades for different window-to-wall ratios

Yao

2019

Journal of Asian Architecture and Building Engineering

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Manual solar shades rely on occupants' control and thus its energy performance is highly related to occupants' behavior. This paper conducted a co-simulation study on the impact of shade behavior on building energy performance and its uncertainty at different window-to-war ratios (WWRs). A previously developed stochastic behavior model for manual solar shades is used in this paper. Results show that energy uncertainty increases from 1.8% to 3.5% as WWR increases from 25% to 90% and a linear regression was given for predicting energy uncertainty with a determination coefficient of 0.9595. Whether energy uncertainty due to stochastic shade behavior has a significant impact on total energy performance depends on WWR design. To have a high and robust building performance, a small WWR that meets minimum daylighting performance is suggested for office buildings in this climate region. For a more accurate simulation of manual shades, a better consideration of manual shades than existing simplified assumptions by building energy regulations/standards is required.

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“…Due to the uncertainty of occupant behavior, actual building energy performance is also uncertain, and thus building performance should be expressed as a probability distribution rather than a single deterministic value [15]. A few studies have reported the uncertainty of energy performance related to occupant behavior (see Table 2).…”

Section: Yearmentioning

confidence: 99%

Uncertainty of Energy and Economic Performance of Manual Solar Shades in Hot Summer and Cold Winter Regions of China

Yao

Zheng

2019

Sustainability

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Occupant behavior is recognized as a major source of discrepancy between simulated and actual energy consumption. This study investigates the uncertainty of energy and economic performance of manual solar shades for the south facade. A developed stochastic model for manual solar shades based on a discrete-time Markov chain method was constructed in Building Controls Virtual Test Bed (BCVTB) for co-simulation with EnergyPlus. The stochastic shade model was compared with deterministic models concerning energy savings potential and life cycle economic performance at different building scales (i.e., from a single room to a whole building). The results show that annual energy uncertainty, due to occupant behavior, on manual shades can be neglected at the building level, whereas for sizing heating equipment, energy uncertainty should be considered. The payback period for manual shades is about 10 years and, in general, a larger building has a higher economic performance. Comparative analysis shows that there is a relatively big performance overestimation or underestimation by commonly used deterministic models in building simulation tools, and thus may lead to a biased economic analysis or even an inappropriate design decision when comparing different energy-saving measures.

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Mitigating office performance uncertainty of occupant use of window blinds and lighting using robust design

Cited by 48 publications

References 57 publications

Automatic vs Manual Control Strategy for Window Blinds and Ceiling Lights: Consequences to Perceived Visual and Thermal Discomfort

Automatic vs Manual Control Strategy for Window Blinds and Ceiling Lights: Consequences to Perceived Visual and Thermal Discomfort

Energy uncertainty of manual solar shades for different window-to-wall ratios

Uncertainty of Energy and Economic Performance of Manual Solar Shades in Hot Summer and Cold Winter Regions of China

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