nx_vessel_thermal_test.nx

nx_vessel_thermal_test.nx -- smoke for nx_vessel_thermal (H0). Proves a real-units physics twin that SIZES HARDWARE IN SOFTWARE: - a 50 W heater on a well-insulated 4 L vessel heats up and reaches the 43 C setpoint (1-2) - equilibrium temperature is correct (3) - DESIGN CHECK: an undersized 5 W heater can NEVER reach 43 C -- caught before buying the part (4-5) - hold duty is sane (< full) and BETTER INSULATION needs less duty (6-8) Exit code = failed assertion number; 0 = all pass.