Test rig is established to measure the stratification characteristics of a water storage tank with new stratifier. When the initial temperature of the tank is 50℃ and the inlet temperature of the water is 20 ℃

the temperature of each layer in the tank is measured when the flow rate is 1.18 L/min

3.19 L/min

5.20 L/min respectively

. The results show that

when the larger the flow rate is

the larger is the slope of the sudden change in temperature curves

the destruction of stratification is more obvious. Based on the first law of thermodynamics and the second law of thermodynamics

the methods of volume

energy and exergy are used to describe the stratification characteristics of the tank. The results show that

when the flow rate is1.18 L/min

3.19 L/min

5.20 L/min respectively

the extraction efficiency is 93.7%

95.7%

96.7% respectively; the discharge efficiency is 98.2%

95.7%

92.3% respectively

which indicate that high extraction efficiency and discharge efficiency is got in three flow rates; when the dimensionless time is 0.7

the exergy efficiency is 13.3%

14.6%

17.6% respectively

and the stratification is worse for high flow rate than that with low flow rate.