Subcooling system of compression refrigeration system

Abstract

The present invention relates to a device and a method for cooling and heat-insulating a heat-preservation enclosed area (3), the device comprising: a refrigerating unit (5), which includes a compressor (7) and an evaporator (13) driven by a heat engine (8); Cooling system (15) of chemical type comprising a reservoir (23) containing a liquefied gas capable of combining after evaporation with a reagent contained in a reactor (17) consisting of a mixture of reagent salts and expanded natural graphite , the obtained reaction product can be heated back through the heating part, and the cooling system includes an evaporator (25) and a condenser (21). The equipment is characterized in that the evaporator (25) of the cooling system is in thermal contact with its refrigerating circuit upstream of the evaporator (13) of the refrigeration unit (5); the reactor of the cooling system is in thermal contact with heating elements which use thermal The heat energy emitted by the engine during its operation; the apparent density of the expanded natural graphite used is between 100‑120 kg / m3; the mass ratio of salt in the reagent is between 50% and 75%.

Description

technical field [0001] The invention relates to a device for cooling and keeping at a low temperature an enclosed area constituted in particular by insulated containers, especially of the type arranged on vehicles for the transport of goods that need to be kept at a low temperature throughout their transport. Background technique [0002] It is known that vehicles such as trucks and semi-trailers that guarantee the transport of goods of the type mentioned above are equipped with refrigeration units known as refrigeration units using a compressor driven by an engine, in particular a heat engine of the diesel type, Usually not the same as a car engine. In a known manner, in this refrigerating unit cooling is produced by evaporation of a refrigerant liquid in an evaporator arranged in the enclosure to be cooled, the gas is then compressed in a compressor in order to condensed in an external condenser. [0003] The work tasks that are known to be imposed on refrigerating units...

AI Technical Summary

Problems solved by technology

[0005] First, the long cool-down times in the enclosure and the power required by the heat engine result in high fuel consumption, which manifests itself in higher operating costs, as well as environmental and noise pollution

[0006] Second, the cool-down time constitutes a disadvantage to the user as it forces the user to shut down the equipment for a long and unprofitable period

[0007] Thirdly, due to the cooling power required in the cooling phase, both the compressor and the motor driving the compressor have to be oversized, which is at the same time disadvantageous in terms of weight, material costs, energy consumption and pollution

Such absorption systems are known not to guarantee evaporation below 5°C, thus severely limiting the power of the system, making it unsuitable for this application, where it should be possible to have a power of about 4kW

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