# Degree-day heating-energy estimate
# Scope: Constant heat demand over a stated interval with supplied efficiency.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

heat = 1000 W
duration = 8 h
efficiency = 0.9

energy := heat*duration/efficiency [kWh]

check daily energy budget: energy <= 10 kWh

scenario alternative: heat = 800 W