Abstract
This article presents an assessment of the performance of a vapor-compression refrigeration system under shock thermal load. The study was carried out on a modernized experimental stand «Kholodilnik-2» equipped with a digital monitoring system, including 24 DS18B20 sensors and an STM32 microcontroller. The main objective was to compare the system behavior when introducing an object with temperatures of 40, 60, and 80°C after reaching a quasi-steady-state mode. Temperature curves, transient process duration, and stabilization times were analyzed. Additionally, features of temperature distribution inside the freezer compartment and the influence of thermal load on the main elements of the cycle were examined.The scientific novelty of the study lies in the comprehensive analysis of transient processes occurring under sudden thermal impacts, with a focus on their duration and system stability. The practical significance of the work is related to the possibility of applying the obtained results to optimize the operating modes of refrigeration systems and to diagnose faults under conditions close to real operation. The optimal regime was found at 60°C, which ensures a balance between transient process duration and uniformity of temperature distribution.