Thermal Expansion Linear Expansion: △L=LC△T a:coefficient of linear expansion Volume Expansion: △V=VB△T B coefficient of volume expansion
Thermal Expansion Linear Expansion: L LT Volume Expansion: V VT α: coefficient of linear expansion β : coefficient of volume expansion
Heat transfer of heat: H= Thermal Resistance to Conduction: R=L/k Conduction Through a Composite Slab A(TH -TL) cond ΣR
Heat transfer of heat: L T T k A t Q H H L R L/ k Thermal Resistance to Conduction: Conduction Through a Composite Slab R A T T P H L cond ( )
When only heat conduction is considered Rose will lose more heat than Jack,but she lives while Jack is dying Why? Convection: =he(Tskin -Tair), Where he is convective heat transfer coefficient per unit area
• When only heat conduction is considered , Rose will lose more heat than Jack, but she lives while Jack is dying ,Why? Convection: Where hc is convective heat transfer coefficient per unit area
For a naked person hc=10.45-w+10u0.5 in kcal/h-m2-C,for speeds between 2 m/s and 20 m/s,where again v is in m/s Find out the ratio of heat loss due to heat conduction to heat convention,under the situations in the film.Explain Jack's death
For a naked person in kcal/h-m2 -◦C, for speeds between 2 m/s and 20 m/s,where again v is in m/s Find out the ratio of heat loss due to heat conduction to heat convention, under the situations in the film. Explain Jack’s death