Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Design of a small-capacity refrigeration machine operating with R744 and capillary tube
Submission Author:
Willian Moreira Duarte , MG , Brazil
Co-Authors:
Willian Moreira Duarte, Lucas Cordeiro Pereira Lima, Yuri Paula, Tiago de Freitas Paulino, Antônio Maia
Presenter: Willian Moreira Duarte
doi://10.26678/ABCM.COBEM2023.COB2023-1623
Abstract
The refrigeration industry has been moving towards environmentally friendly refrigerants, and R744 (carbon dioxide) is a potential solution. The use of R744 as a refrigerant has been gaining attention due to its low environ- mental impact, non-toxic nature, and favorable thermodynamic properties. Despite these advantages, manufacturing small-capacity refrigeration systems operating with R744 has become increasingly less common, probably due to the higher operating pressures compared to other refrigerants, which require specialized components and materials that can withstand high pressures. In addition, the design of these systems can also be challenging due to the selection of the most appropriate correlations to design the heat exchangers and the need to match the design requirements with the parts avail- able on the market for assembling the system. This work aims to present a set of guidelines for designing a small-capacity refrigeration machine operating with R744. The machine has a cooling capacity of 600 W to 1200 W, and operates with an evaporating temperature from 0 to 15°C and a gas cooler pressure from 80 to 105 bars. For the reference condition, the length of the evaporator estimated was 12.9m, the length of the gas cooler was 20.6m and the cooling capacity was 855W.
Keywords
R744 (CO2), Desing Technique, capilary tube, Refrigeration
