Category: Technical Articles

The resistive force opposing vehicle motion through air, increasing with the square of velocity and directly proportional to frontal area and shape. Aerodynamic drag consumes 10-25% of fuel in refrigerated…

Your warehouse staff call it “playing Tetris.” So do we. But in 2002, MIT proved Tetris is NP-hard – no computer can guarantee the optimal solution. Palletising is worse: 3D instead of 2D, mixed box sizes, weight limits, crush resistance, and the physics of surviving 1,200km on the N1. This article breaks down why a 30-box pallet has 10⁵⁵ possible configurations, why standard South African stock boxes don’t tile perfectly on Euro pallets, and why telling us what you’re sending before it arrives saves both of us money.

The practice of bringing refrigerated vehicle cargo space to target temperature before loading—essential for long-haul transport but thermodynamically ineffective for multi-stop courier operations where continuous refrigeration capacity, not initial temperature,…

Your “smart fleet” is just a thermometer with WiFi. Real intelligence requires physics-based predictive analytics, not reactive alarms. R60k/year wasted.

The heat storage capacity of materials within a refrigerated space, determining how much thermal energy must be added or removed to change temperature. In frozen food transport, product thermal mass…

Your fixed-speed compressor wastes 40% of its energy on crude thermostat control. Variable-speed DC systems save R12,500/year. Here’s why you can’t buy one.

Automatic defrost control system that activates on fixed time intervals regardless of actual ice accumulation, wasting 60% of defrost energy through inappropriate scheduling.

The heat exchanger where high-pressure, high-temperature refrigerant gas from the compressor releases heat to the atmosphere, condensing back into liquid for the next refrigeration cycle. The condenser is where heat…

Everyone assumes larger condensers create more drag. They’re wrong. Behind every courier truck cab sits a 1.4-2.0m² flat loadbox wall creating massive drag (C_d ~1.15). Small condensers cover only 20% of it. Large horizontal condensers covering 70-90% act as integrated fairings, SAVING R2,751-R3,528/year in aerodynamic drag—while providing 50-100% more cooling capacity. The loadbox wall is the problem. Large condensers are the solution. Net benefit: R12,751-R15,528/year (aerodynamics + thermodynamics). Payback: 7-13 months.

Small form factor condensers waste 60% of your mounting space. Ram air can’t save undersized coils at courier speeds. Use the space you paid for.