Optimal Constant Area Throat Length Design For An Ejector
Date Issued
2011
Date
2011
Author(s)
鄭兆偉
Abstract
For the practical use and reducing manufacture cost, it needs to make the ejector system in compact form. Therefore, the topic of this research is to reduce the significant length of an ejector, the constant area throat length, L3.
In this study, a commercial CFD package, FLUENT, was used to research and design the ejectors. The influence of the ejector flow field by L3 is similar with the condenser temperature. And the optimal constant area throat length, L3*, was defined in this research. L3* changes significantly when the evaporator temperature is changed. As a conclusion in a variable throat nozzle ejector, operating with wide range of the generator temperature, Tg, from 90℃ to 110℃, evaporator temperature, Te, from 8 to 20℃ and condenser temperature, Tc, from 35 to 40℃, L3* can only be 5% shorter than that of the original design. As the ejector is applied to the hybrid solar-assisted cooling system in which the evaporator can operating at a higher temperature as at 20℃, L3* can be 50% shorter than the original design. As Tg at 90℃, Te at 20℃, Tc at 35℃, L3* can be 80% shorter than the original design.
Subjects
Solar-driven ejector refrigeration
Ejector
Constant area throat length
Numerical simulation.
Type
thesis
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