Calculation of the Refueling Dose of a Temperature Control System with the Two-Phase Circuit

Abstract

The paper proposes a method for evaluating the required amount of coolant filled up into a loop heat pipe and this filling dose effect on its thermal state. The Runge --- Kutta method of the 4th order of accuracy was introduced to solve a system of thermohydraulic equations describing thermal state of the structure with the thermal load on the evaporative heat exchanger specified in the stepwise manner. Based on this model, the amount of coolant required for filling was to be selected, so that when the loop heat pipe was in a vertical position, the condenser and steam channel were flooded. It is shown that liquid underfilling or overfilling in the loop heat pipe has insignificant effect on its performance, except for the extreme cases. If the working fluid amount in the compensation cavity is small, this could cause insufficient supply of fluid to the wick and disruption of the loop heat pipe normal operation. In case when the working fluid filling dose is significant, the compensation cavity is completely filled with liquid. As the thermal load and operating temperature increase, the liquid volumetric expansion liquid leads to its flow from the compensation cavity into the condenser

Please cite this article in English as:

Borshchev N.O. Calculation of the refueling dose of a temperature control system with the two-phase circuit. Herald of the Bauman Moscow State Technical University, Series Mechanical Engineering, 2023, no. 4 (147), pp. 4--15 (in Russ.). DOI: https://doi.org/10.18698/0236-3941-2023-4-4-15

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