ABSTRAKT

The thermal control system (TCS) of the Belarusian spacecraft is developed on the basis of axial grooved heat pipes (AGHPs). The TCS includes thermal honeycomb panels with embedded AGHPs in them with outer diameter of 12.5 mm (Fig. 1), the angular AGHPs with outer diameter of 8 mm (Fig. 2), and "-shaped" AGHPs with outer diameter of 12.5 mm (Fig. 2). Angular AGHPs divert the heat from the honeycomb panels toward the body radiator of the spacecraft. The four collector "-shaped" HPs bind honeycomb panels together for leveling temperature distribution. The thermal vacuum comprehensive tests (TVT) of the spacecraft are the most important and responsible stage during the land thermal vacuum adjustment. Carrying out the TVTs in land conditions is one of the major factors providing spacecraft normal functioning in regular operation conditions. The following was carried out during the tests: the TCS functionality check similar to the real operational conditions; construction temperature fields were investigated; the TCS efficiency on different thermal loadings was determined; and the onboard equipment was checked with the help of the telemetry data received by the measuring and computing complex. The necessary TCS improvements can be made and the admission of the spacecraft to the flight tests can be received by the results of TVTs. The TCS efficiency tests were made by means of the unit temperature change in the course of tests.