The study of solar radiation in space has become something necessary, motivating the launch of radiometers on board satellites dedicated to perform TSI measurements and to build a record of their behavior over the years, making these data essential for meteorology and climatology. In this work, a simplified model was proposed to understand the thermal behavior of absolute radiometers, which are dedicated to this type of measurement. The model considers the heat transfer between parts through conduction and loss only by radiation since the instrument operates in a space environment. The goal is to understand how each component interferes with sensitivity and response time of the instrument depending on its design, material, volume and thermal contact. The model was applied to data generated by a prototype for validation.

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