Conference Editor

Jianshun Zhang; Edward Bogucz; Cliff Davidson; Elizabeth Krietmeyer

Keywords:

daylighting, PCM layer, light transmission, ESP-r, Radiance.

Location

Syracuse, NY

Event Website

http://ibpc2018.org/

Start Date

24-9-2018 3:30 PM

End Date

24-9-2018 5:00 PM

Description

The increase in building energy performance mainly focused on the improvement of physical properties (thermal and optical) of individual components of building envelope. Very good isolation parameters can be easily achieved for opaque elements like walls and roofs. However, improvement of glazed component parameters is still required. Improving thermophysical properties of window can be achieved using phase change material (PCM). Presented work is a part of extensive research project including the analysis and experimental investigation of window integrated with PCM layer. This modification changes the thermal properties of glass unit and effects on visible light transmission through the window. The main purpose of the presented work is numerical analysis of the daylight conditions in the office room equipped with PCM window. The research was done for two geometrically identical indoor spaces varying by the window orientations: eastern and western respectively. Simulation was performed using a coupled validated simulation tools: ESP-r and Radiance. First software was used to model analyzed rooms then using second computational environment the illuminance and daylight factors in selected points were determined. Optical data of glazing unit equipped with PCM were appointed experimentally and adjusted to the numerical model. Simulations were carried out for characteristic sky conditions and selected days of year. Assessment of daylight availability in each room was done based on obtained values of illuminance and daylight factor in selected points. Five cases of the triple glazed window were considered: standard one and equipped with PCM layer positioned in the inner or outer cavity in liquid or solid state. Obtained results show that window with PCM in liquid state does not significantly reduce the daylight availability in room regardless the PCM position. However, window with PCM in solid state significantly decrease the light transmission through the window consequent in insufficient daylight conditions in analyzed rooms.

Comments

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DOI

https://doi.org/10.14305/ibpc.2018.ie-3.03

Creative Commons License

Creative Commons Attribution-Noncommercial 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License.

COinS
 
Sep 24th, 3:30 PM Sep 24th, 5:00 PM

Daylight availability in a room equipped with PCM window

Syracuse, NY

The increase in building energy performance mainly focused on the improvement of physical properties (thermal and optical) of individual components of building envelope. Very good isolation parameters can be easily achieved for opaque elements like walls and roofs. However, improvement of glazed component parameters is still required. Improving thermophysical properties of window can be achieved using phase change material (PCM). Presented work is a part of extensive research project including the analysis and experimental investigation of window integrated with PCM layer. This modification changes the thermal properties of glass unit and effects on visible light transmission through the window. The main purpose of the presented work is numerical analysis of the daylight conditions in the office room equipped with PCM window. The research was done for two geometrically identical indoor spaces varying by the window orientations: eastern and western respectively. Simulation was performed using a coupled validated simulation tools: ESP-r and Radiance. First software was used to model analyzed rooms then using second computational environment the illuminance and daylight factors in selected points were determined. Optical data of glazing unit equipped with PCM were appointed experimentally and adjusted to the numerical model. Simulations were carried out for characteristic sky conditions and selected days of year. Assessment of daylight availability in each room was done based on obtained values of illuminance and daylight factor in selected points. Five cases of the triple glazed window were considered: standard one and equipped with PCM layer positioned in the inner or outer cavity in liquid or solid state. Obtained results show that window with PCM in liquid state does not significantly reduce the daylight availability in room regardless the PCM position. However, window with PCM in solid state significantly decrease the light transmission through the window consequent in insufficient daylight conditions in analyzed rooms.

https://surface.syr.edu/ibpc/2018/IE3/9

 

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