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A refrigerator truck or chiller lorry (also called a reefer), is a van or truck designed to carry perishable freight at low temperatures. Most long-distance refrigerated transport by truck is done in articulated trucks pulling refrigerated hardside (box) semi-trailers , although insulated curtainsiders are common in some countries.
Dry cooling towers (or dry coolers) are closed circuit cooling towers which operate by heat transfer through a heat exchanger that separates the working coolant from ambient air, such as in a radiator, utilizing convective heat transfer. They do not use evaporation and are air-cooled heat exchangers.
Refrigerated containers are capable of controlling temperature ranging from −65 °C (−85 °F) up to 40 °C (104 °F). [1] Some reefers are equipped with a water cooling system, which can be used if the reefer is stored below deck on a vessel without adequate ventilation to remove the heat generated. [2]
The Santa Fe Refrigerator Despatch (SFRD) briefly experimented with dry ice as a cooling agent in 1931. The compound was readily available and seemed like an ideal replacement for frozen water. Dry ice melts at −109 °F or −78.33 °C (versus 32 °F or 0 °C for conventional ice) and was twice as effective thermodynamically.
The M39 series had both single- and dual-rear-tire models; very few single-rear-tire trucks were built. Most models had 11.00×20s with dual rear tires; tractor wreckers had larger 12.00×20s. Bridge trucks and all M139 chassis-based trucks had 14.00×20s. [7] A standard military cab, designed by REO, was used. It had hinged doors with roll-up ...
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Compared with machine-cooled vans, ice-cooled wagons have the disadvantage of uneven temperature control, because the cooling effect is only achieved by air circulation. On the other hand, machine-cooled wagons are expensive to maintain and operate, but can be set to the desired temperature and maintained at that temperature throughout the ...
A 20 June 1945 report by the Army Ground Forces Equipment Review Board recommended that all 4‑ton to 6‑ton tactical trucks should be replaced by a single standard 5‑ton (4,536 kg) 6x6 truck series. In 1949 specifications were set and truck manufactures began working on prototypes.