In order to improve the concentration and energy efficiency of generated ozone

dielectric particles were packed into space of dielectric barrier discharge（PB-DBD）. So we designed a PB-DBD reactor with glass beads and metal powder packed inside the discharge gap

we studied the relationship between the electrical properties of DBD/PB-DBD and ozone concentration

yield

energy efficiency

and power. Moreover

we analyzed the influences of three parameters

such as the cooling water temperature

dielectric loss and energy flux density. The test results show that PB-DBD gets about 40 percent lower ozone generation than DBD when the energy flux density is small

but about 30 percent higher at large energy flux density. Energy efficiency curve rises first and falls later as power increases

and the max ozone concentration is 60 g/m3 when the discharge gap is 2 mm. Low-temperature cooling water is beneficial to ozone generation

such as that PB-DBD reactor using 5 ℃ cooling water gets about 17 percent higher ozone generation than that using 20 ℃cooling water. Metal powder addition is also important in enhancing discharge and increasing ozone concentration and energy efficiency

which is about 25 percent.