# Solar thermal collection estimate
# Scope: Supplied collector efficiency; constant irradiance and no storage losses.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

irradiance = 800 W/m^2
area = 2 m^2
efficiency = 0.5
duration = 4 h

heat := irradiance*area*efficiency [W]
energy := heat*duration [kWh]

check heat energy target: energy >= 3 kWh

scenario alternative: irradiance = 640 W/m^2