New calculation method of orifice plate for chiller
The refrigerant will cavitate downstream of orifice plate and became blocking flow when it's used for the throttling part of chiller.At present,there is no suit-able formula to calculate the flow rate of orifice plate in this condition.After tested on centrifugal chiller under different working conditions,analysed the relationship between mass flow rate,pressure differential and discharge coefficient.Simulated the flow charac-teristics of orifice plate under the experimental conditions,the error between the simula-tion and experimental results is less than 5%.Simulated the mass flow rate of different or-ifice plate under different boundary conditions,the results show that with the increase of undercooling and equivalent diameter ratio the discharge coefficient increase.Redefined the calculation method of discharge coefficient according to the pressure differential while formed blocking flow and compared with simulation and test results,which indicated that this method can accurately predict the mass flow of different refrigerants flowing through orifice plates,and provide a basis for its optimal design.
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