###### Abstract
The [PERSON] research team investigated the cooling of electronic components onboard aircraft using a gravitational heat pipe. The heat pipe cooling has two times more heat dissipation capacity than conventional cooling systems [18]. [PERSON]'s team designed a new cooling technology that combines the principle of phase change with natural cooling. This heat removal method was used to cool the telecommunications base stations. The measurement results show a 50% energy saving [30]. [PERSON] and colleagues performed an experimental measurement of the cooling of a small telecom cabinet. Cooling was provided by means of a gravitational heat pipe, to which air was supplied via fans. The working medium was n-pentane. Measurements have shown that by this method of cooling it is possible to transfer heat three times more than with fans [6]. [PERSON] and colleagues dealt with the cooling of telecommunication systems. They designed a new plate-type loop thermosiphon and examined its thermal performance under free and forced convective cooling conditions with both vertical and horizontal orientations [31]. [PERSON] and colleagues investigated a loop thermosiphon for cooling air inside a telecommunication cabinet. They proposed a model based on the combination of thermal and hydraulic management of a two-phase flow in the loop and experimentally tested a closed thermosiphon loop with different working fluids that could be used for electronic cooling [32]. Miniature periodic two-phase thermosiphons with different evaporator sizes were also investigated for cooling electronic devices. A device with a larger volume transmitted higher heat loads of 110 W. Start-up phenomena were also observed, which proved to be smooth [33]. Further research with miniaturized two-phase devices that are being developed for electronic device applications has been investigated with various working substances [29; 34]. [PERSON] and his team conducted a deeper study of the boiling phenomena and thermal properties of TPLT in electronics cooling. They investigated interfacial structures, boiling instability, heat transfer rates, as well as the effect of pressure on the phase change associated with heater performance and condenser thermal resistance. They concluded that at lower heat loads, the phenomena in the heat pipe are cyclic, unstable, and are characterized by longer onset times [35]. [PERSON] and his research team investigated optimal TPLT loading in the range of 3% to 12%. Experimental studies revealed that of several working substance loading ratios, the optimal ratio was between 7% and 10%. The optimal cooling capacity, which was achieved by regulating the temperature and flow in TPLT to 5 \({}^{\circ}\)C and 0.7 L/min, was also studied [15]. The introduction of the article pointed out the current research works on heat dissipation by the cooling systems based on the loop thermosiphon principle. Every study is exceptional with new proposals and applications, which brings new knowledge in this area. The subject of our research is the design of a dustproof passive cooling device for electrical cabinets operating on the principle of phase change of the working substance capable of transmitting high heat output of 500 to 2000 W. This is an unconventional method of cooling electrical enclosures and can bring many benefits. A novelty of the refrigeration equipment is a new evaporator which can enable more intensive heat transfer and high heating power up to 2000 W. In the following sections, the paper deals with the design and construction of the cooling device, experimental research of its cooling effect under different operating conditions, mathematical calculation equipment, and analysis of the results obtained.