Design of a small-capacity refrigeration machine operating with R744 and capillary tube
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Universidade Federal de Minas Gerais
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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 environmental 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 available 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.
Abstract
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Engenharia mecânica, Refrigeração
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Small-capacity refrigeration machine, R744, CO2, Transcritical operation, Ecological fluid
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https://eventos.abcm.org.br/cobem2023/