Numerical Investigation of an Absorption-Diffusion Cooling Machine Using C3H8/C9H20 as Binary Working Fluid
Résumé
This paper is concerned with the analysis and the simulation of a heat-driven
absorption-diffusion cooling machine which can operate with low-grade heat sources. The
simplified configuration of the heat-powered absorption-diffusion refrigerating machine
considered in this study is based on the Platen-Munters single pressure refrigerators
principle [Platen B.C.V. and Munters C.G. (1928) Refrigerator, US Patent 1, 685-764J.
Three working fluids are used, nonane as an absorbent, propane as a refrigerant and
hydrogen as the inert auxiliary gas. The designed cooling capacity of the machine is 1 kW
which is suitable for a domestic use for refrigeration purposes. We restricted the maximum
temperature of the driving heat supplied to the generator to 130 °C, a temperature
achievable with evacuated-tube solar collectors. The simulations are carried out using a
commercially available flow sheeting software with the PengRobinson equation of state as
property prediction method. In this paper, we analyze the heat and mass transfer
characteristics in all relevant machine components (absorber, condenser, generator and
solution heat exchangers). The simulations results allow determining the values of
different parameters of the systems such as the refrigerant and the solvent temperatures
in various points of the machine, the liquid and the vapor flow rates and compositions.
The system performances were parametrically analyzed using the flow sheeting software.
Performance characteristics were determined for a wide range of operating conditions
allowing investigating and evaluating the effect of various design parameters.
Domaines
Physique [physics]
Origine : Publication financée par une institution
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