Category: Technical Articles

Routing 80 frozen stops across Gauteng means more than 10^122 possible routes. AI wins the maths but hits a wall of dark robots, taxis, security and cold-chain physics. Where it helps — and where it can’t.

Your bodybuilder specified 75mm polyurethane panels with R-2.88 insulation. What they didn’t mention: the aluminium frame conducts heat at 9,300 times the rate of the foam. The frame contributes 79% of total heat infiltration. The R-value certificate describes the other 21%.

The practices, procedures, and temperature maintenance protocols ensuring frozen food products remain safe for human consumption throughout production, storage, transport, and retail distribution. Frozen food safety centers on maintaining products…

Every door opening dumps warm humid air into your loadbox. That moisture freezes on evaporator coils, condenses on walls and packaging, and accumulates across 15-30 stop routes. Nobody designs for it. We calculated it: 0.9 litres per route in Gauteng, 1.3 litres in Cape Town. Physics over marketing.

Your freezer has four temperature sensors and they all show -15°C. Congratulations — you have four instruments confirming your compressor is running. None of them confirm your product is frozen. Here’s the physics of why air temperature ≠ product temperature, the glycol-buffered probe that bridges the gap, and why the CDC won’t let clinics monitor vaccines with air sensors alone.

Your controller reads -15°C. Your product near the doors is -4°C. Both are accurate. Research shows 3-11°C temperature variations exist across refrigerated spaces during normal operation—while controllers report “set point maintained.” The dead zones are real, measurable, and costing you R26,000-R43,000 per vehicle per year.

When your refrigerated courier vehicle sits in the Johannesburg sun, the loadbox roof climbs to 65°C while your cargo must stay at -15°C (TFC standard) or -18°C (R638 baseline). That 75-85°C temperature differential is why your TRU runs constantly and burns excessive fuel. Ceramic thermal coatings block 95% of solar heat at the surface—before it becomes your refrigeration system’s problem. Fleet testing shows…

The practices, procedures, and temperature maintenance protocols ensuring frozen food products remain safe for human consumption throughout production, storage, transport, and retail distribution. Frozen food safety centers on maintaining products…

Average thermal load: 2.3 kW. Peak load at each door opening: 5-6 kW. A system rated for the average cannot handle the peaks. After each stop, temperature recovers partially before the next opening. Across 15 stops, a system “working perfectly” drifts significantly below setpoint. Recovery capacity is the metric nobody discusses.

The total heat energy that must be removed from a refrigerated space to achieve and maintain target temperature, comprising transmission loads through insulation, infiltration loads from air exchange, product loads…