B	Anergy (J)
c	specific heat (J/kg·K)
C	constant (kJ/m3)
E	exergy (J)
$\dot{\mathrm{E}}$	rate of exergy (W)
EN	Energy (J)
K	ratio (/)
P	electric power (W)
Q	Heat (J)
$\dot{\mathrm{Q}}$	heating power (W)
$\dot{\mathrm{S}}$	rate of entropy (J/K·s)
SPF	seasonal performance factor (/)
T	temperature (K)
$\dot{\mathrm{V}}$	volume flow (m3/s)
x	share (/)