Modelagem numerica de uma maquina frigorifica de compressão de vapor

AUTOR(ES)
DATA DE PUBLICAÇÃO

1998

RESUMO

The main objective of this work is to present two numerical models to simulate the dynamic and steady-state behavior of an water-water compression vapor system. The condenser and the evaporator are divided in control volumes. A time dependent partial differential equations system is obtained from the mass, energy and momentum balances for each one control volume. The correlations utilized to calculate the convective heat transfer coefficients, void fraction and drop pressure du e to friction were experimentally validated by various researchers. Due to the fact that the expansion valve and the compressor have a very small thermal inertia they are modeled under steady-state conditions for both models. Dynamic and steady-state models predictions are compared. Satisfactory agreement was found for the case studied. Further simulations are performed aiming to verify the possibility of controlling the refrigeration power system and the superheating of the refrigerant in the evaporator outlet by the compressor speed and valve throttling section variations. Finally, the behavior of a vapor compression system to heat water for domestic purposes is simulated. The results indicated that the models could be used as tools in the design of refrigeration and heating systems by vapour compression and also to obtain an algorithm for controlling such systems

ASSUNTO(S)

mathematical models numerical analysis analise numerica refrigeração modelos matematicos cooling appliances

ACESSO AO ARTIGO

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