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Method of the Loop Heat Pipe's (LHP's) heat transfer characteristics' determination by using nomograms is described in present paper. Graphs, presenting the characteristics of the different parts of the LHP, that have been drawn in combined coordinate system, permit to determine the “working points” which meet the main requirements on the LHP operation.

One of relatively modern directions of two-phase technology in Russia is the development of thermoautofluctuating two-phase heat transferring devices (TTHD ). It is very complicated to classify these devices because of great amount of its constructive variations. However, it is possible to notice, that all TTHD differ from other two-phase heat transferring devices (such, as heat pipes, thermo-syphons, CPL and etc.) by following: circulation of working fluid in TTHD happens periodically. In separate elements of TTHD the liquid, at first, is serially accumulated and then it is spended, and this process is periodically repeated. In some cases the element, in which there are excited the thermoautofluctuations, can functionally execute the role of usual pump providing circulation of liquid working fluid. At the same time thermoautofluctuations are supported by means of usual small-power heater (for example, electrical).