Heat Limits and Work-Rest Design for Brick-Kiln Labour

Thermal budget, work-rest limits, and schedule design for brick-kiln labour, computed from metabolic rates and a WBGT model of the yard. SIMULATED, NOT MEASURED; nothing was built or field-tested. At midday the allowable work fraction is zero for every task (open yard WBGT 34.8 C, firing face 37.1 C, unloading 36.35 C, against stop thresholds of 30.0-31.1 C). Work is possible only at dawn (carrying 32.2 min/h, stacking 40.4 min/h), with firing only shielded at dawn (22.5 min/h) and unloading only after extended cooling (23.2 min/h). The rescheduled day recovers 268.5 of a 1,000-brick carrying baseline (-73.2%), raising labour cost per 1,000 bricks carried from $5.00 to $18.62.