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Heat Exchange Process and U-value kisspng-fire-desktop-wallpaper-clip…
Heat Exchange Process and U-value
U-Value
Prevents heat from transmitting between the interior and exterior of a building
High U-value = High heat loss
Low U-value=Good insulation
Calculation of U-value:
Units are
W/m2oC
Factors affecting the U-value
Thermal resistance(R=b/K
Heat property and a measurement of a temperature difference by which an object resists heat flown
Thermal conductivity(W/moC
All materials have different conductivities due to difference in thickness of the materials
Thermal sensitivity
Its the time required for one unit of heat to pass through a material's surface area
Thermal conductance(W/m2oC)
Thickness of the material
Building purpose
Privacy
Maintain comfortable internal temperature
Protection
Shelter
Passive design
Choice of material: Architectural design: Building configuration
Solar heat Gain=Window area x Radiation heat flow x Solar gain factor
Second law of thermodynamics
: heat moves to achieve equilibrium
