## Abstract

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 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. A 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 relations, and capillary and nucleate boiling limits. The loop heat pipe cycle is presented on a temperature-entropy diagram. A relationship is developed to predict the ratio of the heat of evaporation to the heat leaked to the compensation chamber. This work predicts the size of a LHP, the pumping distance, and the maximum power that can be dissipated for a fixed source temperature.

Original language | English |
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Pages (from-to) | 88-96 |

Number of pages | 9 |

Journal | Annual IEEE Semiconductor Thermal Measurement and Management Symposium |

Publication status | Published - Jan 1 2003 |

Event | Nineteents Annual IEEE Semiconductor Thermal Measurement And Management Symposium - San Jose, CA, United States Duration: Mar 11 2003 → Mar 13 2003 |

## ASJC Scopus subject areas

- Instrumentation
- Electrical and Electronic Engineering