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Calculation

Picture
q″ .   heat flux [W m−2]
ΔP .   pressure difference [Pa]
Be .    Bejan number
μ       dynamic viscosity [kg s−1 m−1]
k .     
thermal conductivity [W m−1 K−1]
a .     air
ae .   air, exterior
ai .     air, interior

Results

Picture
Graph: Temperature (。F) changing trend with time (s) going
Picture
Heat Flux (q'')
According to the temperature changing graph, the 3/16 concrete wall hold the heat best and the 1/16 has the worst capacity of keeping heat. However, heat exchanging is another thing, where heat flux (q'') describes the heat-transfer capacity. In detail to say, the amount of air and differential pressure also affect the heat exchanging process. The 1/16 wall keeps the wind from going through in some ways, which has a negative effect on heat transfer.  The 1/4 wall has overlarge holes, which let the heat losing easily.

So d=3/16 is the best size of holes for heat exchanging among 1/16, 1/8, 3/16 and 1/4 (worst).

Next-step Prediction

​The heat-exchange capacity of wall will probably increase with the holes becoming larger, and then decrease. More different sizes of holes should be test in the future to prove this relationship.
Picture
​
  • Projects
    • Environment Box
    • Passive Refrigeration
    • Water Cooling
    • Fog Catching
    • Roof Geometries
    • Optimal Insulation
    • Cooler Windcatcher
    • Green Machine
    • Mitigating Humidity
    • Convective Air Flow
    • Styrene Reuse
    • Thermal Reflection
    • ETFE Rigidification
    • Phase Change Materials
    • Polar Reflection
    • Cavity Depth Variation
    • Vapor Permeability
    • Algae Facade
    • Moisture Buffering
    • Engineered Geometries
    • Recycled Desiccant Materials
    • Living Wall
    • Solar Shading Facades
    • SHADESin.reACTION
    • Low-Fab Dehumidification
    • Breathing Wall
    • Urban Heat Island
    • Acoustical Design
    • Latent Heat of PCM's
    • Insulative Qualities of Air
  • About
  • Lectures
    • Building Science Basics I
    • Building Science Basics II
    • Research & Literature Review
    • Scales of Fabrication
    • Electronics
    • Methodology
    • Graphical Excellence
    • Moving Graphics
  • Assignments
    • 1: Research Proposal
    • 2: Prototype
    • 3: Data
    • 4: Design Proposal
    • Presentation & Paper
  • Workshops
    • Thermal Scavenger Hunt
    • Balance Point Game
    • Advanced Shop Training
    • Basic Electronics
    • Advanced Electronics
    • Excel & Illustrator
    • Data Visualization
    • Videos
    • Animations
  • Syllabus
  • Resources