Browse Publications Technical Papers 2000-01-2317

Performance Characterization and Model Verification of a Loop Heat Pipe 2000-01-2317

A simple Loop Heat Pipe (LHP) with a single evaporator and condenser was tested and modeled with two different working fluids: ammonia and propylene. While ammonia exhibits many desirable heat transfer characteristics, its freezing point is too high to prevent freezing in the condenser lines during a safing mode on a satellite platform. Consequently, propylene makes a good compromise since it has a lower freezing point and relatively good heat transfer properties.
The performance of the LHP with ammonia was characterized by a series of tests with heat loads of 20 to 800 watts placed on the evaporator. With the LHP filled with propylene, it was tested with heat loads of 20 to 200 watts to the evaporator. The sink temperatures on the condenser ranged from −10°C to 20°C. The constant conductance performance of the LHP was 170 W/K with ammonia and 44 W/K with propylene.
Steady state performance data of the LHP was used to validate a nodal network model of the device. The evaporator temperature as a function of heat load was compared between the collected data and the model. The average difference between the observed and the predicted evaporator temperatures were 0.85°C with ammonia and 1°C with propylene.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.

Due to current capacity constraints, printed versions of our publications - including standards, technical papers, EDGE Reports, scholarly journal articles, books, and paint chips - may experience shipping delays of up to four to six weeks. We apologize for any inconvenience.
We also recommend:

Development and Tests of Miniature Loop Heat Pipe with a Flat Evaporator


View Details


Design and Investigation of Methods of Regulation of Loop Heat Pipes for Terrestrial and Space Applications


View Details


Deployable Radiators - A Multi-Discipline Approach


View Details