Abstract
Liquid ring vacuum (LRV) pump working fluid temperature has a great influence on its energy efficiency. To improve the energy efficiency of the pump, a new model for the energy dissipation of the LRV pump was established based on the relationship between pump suction capacity, the vaporization loss rate of the working fluid and working fluid temperature. Furthermore, the theoretical model was experimentally verified and quantitatively analyzed. The results showed that the useless power increased and suction capacity decreased with increasing working fluid temperature. When the pump shaft speed was 1500r/min and the inlet pressure was 45kpa, the inlet liquid temperature increased from 15 °C to 45 °C, while the proportion of waste work dissipated by temperature rise of the working fluid significantly decreased from 78.8% to 22.1%. On the contrary, the proportion of the working fluid vaporization, the temperature rise of gas, and the convective heat transfer from the pump outer wall increased. The working fluid temperature positively correlated with the inlet fluid temperature and negative correlated with the inlet flow rate. To further reduce the pump operating temperature, it is necessary to increase the flow rate and reduce the inlet temperature.
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