The Experts below are selected from a list of 16593 Experts worldwide ranked by ideXlab platform
Daniel Oberfeld - One of the best experts on this subject based on the ideXlab platform.
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Which Attribute of Ceiling Color Influences Perceived Room Height
Human factors, 2018Co-Authors: Christoph Von Castell, Heiko Hecht, Daniel OberfeldAbstract:Objective:We investigate effects of the hue, saturation, and luminance of ceiling color on the perceived Height of interior spaces.Background:Previous studies have reported that the perceived heigh...
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Surface lightness influences perceived Room Height
Quarterly journal of experimental psychology (2006), 2010Co-Authors: Daniel Oberfeld, Heiko Hecht, Matthias GamerAbstract:Surprisingly little scientific research has been conducted on the effects of colour and lightness on the perception of spaciousness. Practitioners and architects typically suggest that a Room's ceiling appears higher when it is painted lighter than the walls, while darker ceilings appear lower. Employing a virtual reality setting, we studied the effects of the lightness of different Room surfaces on perceived Height in two psychophysical experiments. Observers judged the Height of Rooms varying in physical Height as well as in the lightness of ceiling, floor, and walls. Experiment 1 showed the expected increase of perceived Height with increases in ceiling lightness. Unexpectedly, the perceived Height additionally increased with wall lightness, and the effects of wall lightness and ceiling lightness were roughly additive, incompatible with a simple effect of the lightness contrast between the ceiling and the walls. Experiment 2 demonstrated that the floor lightness has no significant effect on perceived Height, and that the total brightness of the Room is not the critical factor influencing the perceived Height. Neither can the results be explained by previously reported effects of brightness on apparent depth or perceived distance.
Marko Rosenqvist - One of the best experts on this subject based on the ideXlab platform.
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the effect of typical buoyant flow elements and heat load combinations on Room air temperature profile with displacement ventilation
Building and Environment, 2016Co-Authors: Risto Kosonen, Natalia Lastovets, Panu Mustakallio, Guilherme Carrilho Da Graca, Nuno M Mateus, Marko RosenqvistAbstract:Abstract Typically vertical temperature gradient is modelled to be linear over the Room Height. More advanced models consist of several nodes that allow different slopes for the temperature profile between the nodes. Validation and development of all those models have been based mainly on measurement using low ceiling Height (below 3 m). Also, the previous studies have not covered typical flow elements that exist in office buildings. In this study, the performance of a displacement ventilation system is studied using 3.3 m and 5.1 m ceiling Heights in a variety of load conditions. Typical buoyant flow elements and heat load combinations were measured in a simulated office Room. The experimental study included Room air temperature measurements at different Heights and locations over the occupied zone in addition to surface measurement and supply and exhaust air temperature measurements. The measurement data was compared with current models. The results show that the major part of the vertical temperature gradient occurs already at low level. With some typical buoyant flow elements there is no benefit if the ceiling is lower or higher level. Also, measurements depict that modelled non-dimensional temperature profile using low ceiling Height (about 3 m) is not valid for high ceiling applications (more than 4 m). Multi-node models works quite well with several buoyant flow elements. Still, the proposed multi-node models did not give good estimation of the vertical temperature gradient when warm window surface or heat gains at ceiling level were introduced in the Room space.
Matthias Gamer - One of the best experts on this subject based on the ideXlab platform.
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Surface lightness influences perceived Room Height
Quarterly journal of experimental psychology (2006), 2010Co-Authors: Daniel Oberfeld, Heiko Hecht, Matthias GamerAbstract:Surprisingly little scientific research has been conducted on the effects of colour and lightness on the perception of spaciousness. Practitioners and architects typically suggest that a Room's ceiling appears higher when it is painted lighter than the walls, while darker ceilings appear lower. Employing a virtual reality setting, we studied the effects of the lightness of different Room surfaces on perceived Height in two psychophysical experiments. Observers judged the Height of Rooms varying in physical Height as well as in the lightness of ceiling, floor, and walls. Experiment 1 showed the expected increase of perceived Height with increases in ceiling lightness. Unexpectedly, the perceived Height additionally increased with wall lightness, and the effects of wall lightness and ceiling lightness were roughly additive, incompatible with a simple effect of the lightness contrast between the ceiling and the walls. Experiment 2 demonstrated that the floor lightness has no significant effect on perceived Height, and that the total brightness of the Room is not the critical factor influencing the perceived Height. Neither can the results be explained by previously reported effects of brightness on apparent depth or perceived distance.
Heiko Hecht - One of the best experts on this subject based on the ideXlab platform.
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Which Attribute of Ceiling Color Influences Perceived Room Height
Human factors, 2018Co-Authors: Christoph Von Castell, Heiko Hecht, Daniel OberfeldAbstract:Objective:We investigate effects of the hue, saturation, and luminance of ceiling color on the perceived Height of interior spaces.Background:Previous studies have reported that the perceived heigh...
-
Surface lightness influences perceived Room Height
Quarterly journal of experimental psychology (2006), 2010Co-Authors: Daniel Oberfeld, Heiko Hecht, Matthias GamerAbstract:Surprisingly little scientific research has been conducted on the effects of colour and lightness on the perception of spaciousness. Practitioners and architects typically suggest that a Room's ceiling appears higher when it is painted lighter than the walls, while darker ceilings appear lower. Employing a virtual reality setting, we studied the effects of the lightness of different Room surfaces on perceived Height in two psychophysical experiments. Observers judged the Height of Rooms varying in physical Height as well as in the lightness of ceiling, floor, and walls. Experiment 1 showed the expected increase of perceived Height with increases in ceiling lightness. Unexpectedly, the perceived Height additionally increased with wall lightness, and the effects of wall lightness and ceiling lightness were roughly additive, incompatible with a simple effect of the lightness contrast between the ceiling and the walls. Experiment 2 demonstrated that the floor lightness has no significant effect on perceived Height, and that the total brightness of the Room is not the critical factor influencing the perceived Height. Neither can the results be explained by previously reported effects of brightness on apparent depth or perceived distance.
Risto Kosonen - One of the best experts on this subject based on the ideXlab platform.
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the effect of typical buoyant flow elements and heat load combinations on Room air temperature profile with displacement ventilation
Building and Environment, 2016Co-Authors: Risto Kosonen, Natalia Lastovets, Panu Mustakallio, Guilherme Carrilho Da Graca, Nuno M Mateus, Marko RosenqvistAbstract:Abstract Typically vertical temperature gradient is modelled to be linear over the Room Height. More advanced models consist of several nodes that allow different slopes for the temperature profile between the nodes. Validation and development of all those models have been based mainly on measurement using low ceiling Height (below 3 m). Also, the previous studies have not covered typical flow elements that exist in office buildings. In this study, the performance of a displacement ventilation system is studied using 3.3 m and 5.1 m ceiling Heights in a variety of load conditions. Typical buoyant flow elements and heat load combinations were measured in a simulated office Room. The experimental study included Room air temperature measurements at different Heights and locations over the occupied zone in addition to surface measurement and supply and exhaust air temperature measurements. The measurement data was compared with current models. The results show that the major part of the vertical temperature gradient occurs already at low level. With some typical buoyant flow elements there is no benefit if the ceiling is lower or higher level. Also, measurements depict that modelled non-dimensional temperature profile using low ceiling Height (about 3 m) is not valid for high ceiling applications (more than 4 m). Multi-node models works quite well with several buoyant flow elements. Still, the proposed multi-node models did not give good estimation of the vertical temperature gradient when warm window surface or heat gains at ceiling level were introduced in the Room space.
