The entransy dissipation and generalized thermal resistance theory is utilized in researching dissipation and generalized transfer temperature difference in convection. Three computing forms of heat transfer resistance for control volume is proposed and validated by two-dimensional laminar convection in parallel channels. Traditional surface heat transfer coefficient does not accurately reflect the thermal conductivity (resistance) capabilities of control volume while compare with it. The generalize resistance method is reliable for two reasons

first is that three forms of expression consistent with others perfectly

second is that the thermal resistance consistent with conduction while convection degenerate to conduction. The validation of convection in parallel flow shows that the basically general trend of generalized thermal resistance increases with flow development

consistent with basic idea of convective heat transfer. On the while

the definition style of thermal resistance does not increase with flow in several circumstance and influenced by temperature and transfer quantity obviously

due to the definition type simplify the expression of thermal resistance construction.