Educational refrigeration system project for the generation of an ice rink: part 2

This paper, as Part 2 of an educational project, details the construction and operational procedures of a didactic refrigeration system for an artificial ice rink. Building on Part 1, the work defines the configuration of a vapor compression cycle with direct expansion, using a ¼ HP condensing unit with R22 and accessory components for expansion, control, and safety. Construction aspects include mechanical arrangements, thermal insulation, and integration of a copper coil evaporator into a concrete block. Operational protocols are proposed for start-up, commissioning, and adjustment, focusing on superheating, subcooling, and pressure regulation. Leak detection, dehydration, and charging procedures are also included to ensure reliability. The system delivers a cooling capacity of 430 kcal/h, achieving –6 °C at the rink surface, with a coefficient of performance of about 3.16. Beyond its practical function, the system serves as a didactic platform for experimental validation and training. The project continues with Parts 3 and 4, under development with shell-and-tube and plate heat exchangers.