Occupant performance and building energy consumption with different philosophies of determining acceptable thermal conditions

Toftum, Jørn; Andersen, Rune Korsholm; Jensen, Kasper Lynge

doi:10.1016/j.buildenv.2009.02.007

Cited by 69 publications

(20 citation statements)

References 7 publications

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“…The methodology and targets for the evaluation of daylighting in residential buildings are less clearly defined. For offices, a daylight factor of 2% is required in the working plane, but for nearly-zero energy residential buildings, the Danish building code only requires a minimum glazing-to-floor ratio of 15% in primary rooms when side-lit windows with a light transmittance of 0.75 are used [36]. If the light transmittance is lower, the glazing-to-floor ratio should be increased proportionally.…”

Section: Parameter Variationsmentioning

confidence: 99%

Impact of façade window design on energy, daylighting and thermal comfort in nearly zero-energy houses

Vanhoutteghem

Skarning

Hviid

et al. 2015

Energy and Buildings

132

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Appropriate window solutions are decisive for the design of 'nearly zero-energy' buildings with healthy and comfortable indoor environment. This paper focuses on the relationship between size, orientation and glazing properties of façade windows for different side-lit room geometries in Danish 'nearly zero-energy' houses. The effect of these parameters on space heating demand, daylighting and thermal environment is evaluated by means of EnergyPlus and DAYSIM and presented in charts illustrating how combinations of design parameters with minimum space heating demand can be selected within a solution space defined by targets for daylighting and thermal comfort. In contrast with existing guidelines, the results show an upper limit for energy savings and utilisation of solar gains in south-oriented rooms. Instead, low U-values are needed in both north-and south oriented rooms before large window areas lead to reductions in space heating demand. Furthermore, windows in south-oriented rooms have to be carefully designed to prevent overheating. Design options for prevention of overheating, however, correspond well with options for low space heating demand. Glazings with solar control coating are therefore obvious alternatives to dynamic solar shadings. Regarding room geometry, deep or narrow southoriented rooms show difficulties in reaching sufficient daylight levels without overheating.

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Section: Parameter Variationsmentioning

confidence: 99%

Impact of façade window design on energy, daylighting and thermal comfort in nearly zero-energy houses

Vanhoutteghem

Skarning

Hviid

et al. 2015

Energy and Buildings

132

View full text Add to dashboard Cite

show abstract

“…Some are detailed on Table 1. Thermally adaptive comfort is being used as a new way to express energy performance, but requires further improvement of thermal adaptability and sensation in buildings with different climatic systems [22].…”

Section: Energy and Visual Performance Evaluation Criteria A) Energy mentioning

confidence: 99%

Considerations on design optimization criteria for windows providing low energy consumption and high visual comfort

et al. 2012

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“…Nevertheless, their spread, along with the design strategy of controlling the most important features centrally in order to prevent users' actions, do not reduce energy consumption since the default setting could lead to considerable energy waste [10]. Furthermore, different studies [10][11][12][13][14] have stressed the importance of giving the occupants the opportunity to control directly the indoor environmental condition in order to set their own comfort level, in order to achieve high occupants' satisfaction. Because of this, occupants' interactions with building controls need to be taken into account when designing buildings.…”

Section: Introductionmentioning

confidence: 99%

Accounting for the Uncertainty Related to Building Occupants with Regards to Visual Comfort: A Literature Survey on Drivers and Models

2016

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Abstract:The interactions between building occupants and control systems have a high influence on energy consumption and on indoor environmental quality. In the perspective of a future of "nearly-zero" energy buildings, it is crucial to analyse the energy-related interactions deeply to predict realistic energy use during the design stage. Since the reaction to thermal, acoustic, or visual stimuli is not the same for every human being, monitoring the behaviour inside buildings is an essential step to assert differences in energy consumption related to different interactions. Reliable information concerning occupants' behaviours in a building could contribute to a better evaluation of building energy performances and design robustness, as well as supporting the development of occupants' education to energy awareness. The present literature survey enlarges our understanding of which environmental conditions influence occupants' manual controlling of the system in offices and by consequence the energy consumption. The purpose of this study was to investigate the possible drivers for light-switching to model occupant behaviour in office buildings. The probability of switching lighting systems on or off was related to the occupancy and differentiated for arrival, intermediate, and departure periods. The switching probability has been reported to be higher during the entering or the leaving time in relation to contextual variables. In the analysis of switch-on actions, users were often clustered between those who take daylight level into account and switch on lights only if necessary and people who totally disregard the natural lighting. This underlines the importance of how individuality is at the base of the definition of the different types of users.

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Occupant performance and building energy consumption with different philosophies of determining acceptable thermal conditions

Cited by 69 publications

References 7 publications

Impact of façade window design on energy, daylighting and thermal comfort in nearly zero-energy houses

Impact of façade window design on energy, daylighting and thermal comfort in nearly zero-energy houses

Considerations on design optimization criteria for windows providing low energy consumption and high visual comfort

Accounting for the Uncertainty Related to Building Occupants with Regards to Visual Comfort: A Literature Survey on Drivers and Models

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