Symbols:

C Loss coef. of boxes

th thermal

S surface of element, m²

t Time, h

j layer number

T temperature, ˚C

COP Coef. of performance

n number of layer

e thikness, m

W Energy consumption, kW∙h

B box

V Voltage, V

Greek Letters:

A ambient

R Electrical resistance, Ω

λ thermal conductivity, W∙m⁻¹·K⁻¹

C hot contact

R' Resistance, K∙W⁻¹

φ heat flux, W

F cold contact

P Electrical Power, W

Indices/Exponents:

a absorbed

h isothermal convection coef., W∙m⁻²∙K⁻¹

i internal

o operating

e external

an annual