Thermal Analysis and Control of MIST CubeSat

Sammanfattning: The thermal analysis and control provides the necessary means to control the temperatureof the satellite during the harsh conditions in space. MIST CubeSat presents a challengingtask to design such a system with its various payloads and subsystems on board. Thisthesis report aims to describe the modelling and design of the thermal control systemdeveloped for MIST CubeSat in detail.Each of these payloads and subsystems have different thermal requirements that has tobe met in order to maintain thermal equilibrium. Hence in this project, all the units aregiven equal importance for the analysis to ensure the safety. A detailed thermal modelof MIST CubeSat was developed using Systema-Thermica software. With this model,three different thermal cases such as the Hot Operational case, Cold Non-Operationaland Operational cases were analysed. Furthermore, an initial dissipation profile for allthe units present in the CubeSat was created for the thermal analysis. Based on thetemperatures obtained, a thermal control system was designed to maintain the thermalbalance between the satellite and the environment. This report also gives details of theassumptions made at certain points of the analysis.The thermal control system for MIST CubeSat consists of both passive and active means.The passive means includes the use of thermal tapes on some of the payloads and subsystemson board. It was observed that the passive means were not enough to maintain thetemperatures and hence active systems such as heaters were implemented for certain units.The results indicate that not all the payloads are within the tolerable limits and hencefurther development of the thermal control system is needed. Lastly the results includethe overall design changes made in the model and a conclusion along with a possibility offuture work has been discussed.