Performance Analysis of a Twin Rotary Compressor
For a twin rotary compressor, a computer simulation program has been developed. With R22, predicted cooling capacity, compressor input and EER were found to be in good agreement with experimental results. Calculated P-V diagram was also compared well to that of measurement. With the simulation program, parametric study has been performed to investigate effects of cylinder dimensions on R410A twin rotary compressor performance. Over the ranges of cylinder dimensions studied, some variations were found for volumetric, adiabatic and mechanical efficiencies, but overall compressor performance did not change much. Discharge port configuration was found to have large effect on adiabatic efficiency, but not much on volumetric efficiency.
Dynamic Analysis of a Rotor-Journal Bearing System for Twin Rotary Compressors
A rotor-journal bearing system for a twin rotary compressor has been nlliDerically analyzed to estimate the reliability and to optimize the bearing design. For rotary compressors, large dynamic loads act on the rotor. They are unbalanced forces due to eccentric rotation parts and gas forces induced by the difference in pressure between compression and suction gases. In such a case, the rotor-journal bearing system becomes nonlinear, because the stiffness and damping coefficients of the lubricating oil film in the bearings vary. Such a rotor system is solved as a coupled problem of momentum equations and Reynolds equations for all the bearings. The analytical procedure and the results are described in this paper.
Developmental disability.
As defined in A.R.S. §36-551, a strongly demonstrated potential that a child under six (6) years of age has a developmental disability or will become a child with a developmental disability, as determined by a test performed pursuant to section 36-694 or by other appropriate tests, or a severe, chronic disability that: a. Is attributable to cognitive disability, cerebral palsy, epilepsy or autism; b. Is manifested before age eighteen (18); c. Is likely to continue indefinitely; d. Results in substantial functional limitations in three or more of the following areas of major life activity: