A two-phase circulation cooling system with a multi-channel direct cooling plate was developed. The R1233zd(E) cooling medium was used. The thermodynamic cycle and cooling performance were investigated under the following conditions: the condensing temperature was set to 10

15

and 20 °C

the mass flux varied from 147–882 kg/(m2?s)

and the heat flux varied from 7.73–39.75 kW/m2. The results show that the enthalpy of the refrigerant at the cooling plate outlet decreases with an increase in the mass flux. Additionally

the system pressure and enthalpy of the refrigerant increase with an increase in heat flux. Under different heat fluxes

the wall temperature of the cold plate varies differently. When the heat flux is 7.73 kW/m2

the maximum temperature difference decreases from 2.9 to 1.6 K

whereas the mass flux rises from 147 to 735 kg/(m2?s). For a heat flux of 39.75 kW/m2

the maximum temperature of local wall difference increases from 3.6 to 5.2 K. For different mass flux

the heat transfer coefficients rise to different degrees with an increase in heat flux. When the mass flux is 147 kg/(m2?s)

the heat transfer coefficient increases from 1 843 to 4 528 W/(m2?K). However

for a mass flux of 588 kg/(m2?s)

the heat transfer coefficient under the same condition rises from 1 536 to 3 569 W/(m2?K).