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A theoretical study is conducted to explore the effect of different parameters on the performance of a loop heat pipe (LHP). These parameters are evaporator temperature, condenser temperature, total mass charge, the tube size of the piping system, and pumping distance between evaporator and condenser. This paper presents a steady state model that describes the thermodynamics, heat transfer, and fluid mechanics inside an LHP. An LHP is a two-phase device with extremely high effective thermal conductivity that utilizes the thermodynamic pressure difference that developed between the evaporator and condenser to circulate a working fluid through a closed loop. The loop heat pipe efficiently transports the heat generated by a highly localized concentrated heat source and discharges this heat to a convenient sink. The steady state LHP model is described by the conservation equations, thermodynamic …