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Building Environmental Science
Q= (within same state)
M*C*deltat]
Q = (changing state)
M*L
Qt =
Qw+Ql
efficiency =
Qw/Qt
power =
Total energy / time
Q = (heat transition)
(K*A* delta t) / x
resistivity
1 / K
resistance
X / K
U value =
1 / sum of R
Q = (in terms of heat transfer)
A*delta t*/RSI+RC+RSO
Q = (fabrication)
U*A*delta t
Q = (ventilation)
0.33*N*V*delta t
Q = (total)
Qf + Qv
velocity (V) =
frequency x wavelength
Energy (light)=
h (6.63*10^-34) x frequency
solid angle (w) =
a/r^2
area of sphere
4 *pi *r^2
solid angle of isotropic source
4 * pi
I (luminous intensity) =
F/w(solid angle) (unit = cd)
F (isotropic source) =
4 *pi *I (unit: lumens)
E =
I / d^2 (lux)
E =
F / A
E is proportional to
1/r^2