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Refrigerator trucks can be cooled with ice, dry ice, liquid carbon dioxide, or mechanical refrigeration systems (transport refrigeration units, TRUs) powered by small displacement engines or by the truck's main engine. [4] They are often equipped with small "vent doors" at the rear and front of the trailer.
An American commercial car carrier typically fits between 5 and 9 cars, depending on the car size and trailer model (capacity is limited by an 80,000 lb weight cap that a road vehicle is subject to under U.S. law. [1] [irrelevant citation]). Significantly higher-capacity vehicles have been observed around the world, such as a side-by-side ...
Truckload shipping is freight transport in which a semi-trailer or intermodal container is filled entirely with one type of cargo. It differs from less-than-truckload shipping (LTL) in which freight from multiple customers is combined in one trailer. A truckload carrier is a trucking company that contracts entire trailer-load to a single customer.
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.
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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.