A mathematical model for a thermodynamic pump capable of lifting water
by temperature difference has been developed. The model has been test
ed experimentally by designing a pump which had no moving parts. The p
ump was operated by the temperature difference of a condenser (5-15 de
grees C) and a boiler (30-50 degrees C). The pump performance was favo
urably compared with the model and pump output under these conditions
was 0.8 W (when 120 kg/hr water was lifted 2.5 m). The pump efficiency
was rather low, however, the main advantage of such a pump is the abs
ence of moving parts and direct contact between water and the working
fluid.