Thermal Control with Low Power, Miniature Loop Heat Pipes

1999 ◽  
Author(s):  
Walter B. Bienert ◽  
William J. Krotiuk ◽  
Michael N. Nikitkin
Keyword(s):  
Low Power ◽  
Heat Pipes ◽  
Thermal Control ◽  
Loop Heat Pipes

scholarly journals Simulation of the thermal control system of nanosatellite using the loop heat pipes under the orbital flight conditions

2021 ◽  
Vol 22 (1) ◽  
pp. 23-35
Author(s):  
Yu Wang ◽  
Oleg V. Denisov ◽  
Liliana V. Denisova
Keyword(s):  
Control System ◽  
Thermal Regime ◽  
Thermal Power ◽  
Heat Removal ◽  
Heat Pipes ◽  
Thermal Control ◽  
Thermal Design ◽  
Loop Heat Pipes ◽  
Thermal Control System ◽  
Design Power

One of the key problems in the development of nanosatellites is to provide a given temperature range for the operation of the on-board computer. The constantly increasing information load leads to the need to use more advanced processors with high thermal design power (TDP). The indicated thermal regime of processors can be achieved using remote heat removal systems - miniature loop heat pipes. Using a model of nanosatellite as an example, a thermal control system with miniature loop heat pipes is designed. The simulation was carried out in the Siemens NX program in the elliptical and geostationary orbits of the Earth. The cooling schemes of the processor with a thermal power of 15 W using one and two loop heat pipes are considered. Calculations showed that the use of loop heat pipes can reduce the processor temperature to acceptable values. The anisotropy of the thermal conductivity coefficient in the reinforcement plane of the composite material of the nanosatellite case can have a significant effect on the temperature of the processor. This opens up prospects for the use of anisotropic composite materials to ensure the thermal regime of the nanosatellite.

Development of Flat-Plate Loop Heat Pipes for Spacecraft Thermal Control

2019 ◽  
Vol 31 (4) ◽  
pp. 435-443 ◽  
Author(s):  
Hongxing Zhang ◽  
Guoguang Li ◽  
Ling Chen ◽  
Guanglong Man ◽  
Jianyin Miao ◽  
...  
Keyword(s):  
Flat Plate ◽  
Heat Pipes ◽  
Thermal Control ◽  
Loop Heat Pipes ◽  
Spacecraft Thermal Control

Response of Loop Heat Pipes to Transient Heat Loads

1999 ◽  
Author(s):  
J. B. Long ◽  
J. M. Ochterbeck
Keyword(s):  
Heat Pipe ◽  
Control Systems ◽  
Heat Pipes ◽  
Thermal Control ◽  
Loop Heat Pipe ◽  
Loop Heat Pipes ◽  
Power Inputs ◽  
Cyclic Heat ◽  
Lower Limits ◽  
Heat Loads

Abstract Loop heat pipes currently are being used in the thermal control systems for satellites. To expand possible loop heat pipe applications, information regarding response to transient heat inputs is required. In this investigation, two loop heat pipes with dual compensation chambers were subjected to heat inputs of varying magnitude, frequency, and waveform (square and sinusoidal). The performance of each loop heat pipe under these conditions was evaluated in different gravitational orientations. The upper and lower limits of heat transport also were assessed. A principle finding was that cyclic heat loads tended to aid startup of the loop heat pipes at the low power inputs.

Loop Heat Pipes for Thermal Management of Electric Vehicles

2021 ◽  
pp. 1-12
Author(s):  
Randeep Singh ◽  
Tien Nguyen
Keyword(s):  
Heat Pipe ◽  
Thermal Management ◽  
Electric Vehicles ◽  
Hot Spot ◽  
Heat Pipes ◽  
Thermal Control ◽  
Loop Heat Pipe ◽  
Basic Module ◽  
Loop Heat Pipes ◽  
High Level

Abstract This present paper investigates the potential of loop heat pipe (LHP), with respect to technological merits and application niche, in automotive thermal management. Broadly, LHP design and applicability for hot spot cooling in electronics (local dissipation), and for heat transport over longer distances (remote dissipation) has been proposed and discussed in detail. The basic module in these applications includes loop heat pipe with different shapes and sizing factors. Two types of LHP design have being tested and results discussed. The miniature version, with 10 mm thick and flat evaporator, for cooling ECU with 70 W chipset while keeping source temperature below 100 °C limit was evaluated. Two larger versions with cylindrical evaporator, 25 mm diameter & 150 mm length, and heat transfer distances of 250 mm and 1000 mm respectively were tested for power electronics and battery cooling, with more than 500 W transport capabilities in gravity field. In conclusions, loop heat pipes will provide an energy efficient passive thermal control solution for next generation low emission automotive, particularly for electric vehicles which have high level electrifications and more definitive cooling requirements.

Heat and Mass Transfer in Loop Heat Pipes

2003 ◽  
Author(s):  
Triem T. Hoang ◽  
Jentung Ku
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
High Performance ◽  
Heat Pipes ◽  
Thermal Control ◽  
Complete Understanding ◽  
Loop Heat Pipes ◽  
Transfer Processes ◽  
Mass Transfer Processes ◽  
Control Concept

Loop Heat Pipes (LHPs) have gained acceptance among spacecraft engineers in recent years as high performance heat transport devices for thermal control systems (TCS). However, the most common criticism from people who use LHPs is that their behavior is difficult to predict. Complex interaction of thermodynamics and fluid flow dynamics inside a LHP poses a challenge for the analytical modeling of its performance. The need for a complete understanding of mechanisms involving the heat and mass transfer in a LHP cannot be overstated. During the initial spacecraft TCS design phase, trade studies are usually carried out to select an appropriate thermal control concept for the design. The inability to accurately predict the LHP response in the actual operating environment often leads to the dismissal of LHPs for lack of certainty. This paper attempts to present a simplistic explanation of LHP operation in terms of heat and mass transfer processes, in hope that it will help the potential end-users to understand the technology better. Most of the observed phenomena described herein are based on available test data of various LHP systems. Nevertheless, a few anomalies especially during operational transients are still not well understood. For that, research ideas will also be proposed.

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