晨怡热管 >> 资料积累 >> 国外文献 >> Heat Pipe Blackbody Cavity

Heat Pipe Blackbody Cavity

晨怡热管 2007-2-6 23:14:11

ACT's Heat Pipe Blackbody Cavity (HPBC) is an annular heat pipe with a hemispherical or conical end cap. The heat pipe achieves temperature uniformity by continuous evaporation and condensation of a working fluid, sealed within the annular space. Since the working fluid is in two-phase equilibrium with its own vapor, all wetted surfaces are isothermal.

In the HPBC, the annular heat pipe along with the typical hemispherical end cap forms the isothermal blackbody cavity. The temperature uniformity is typically within 0.1°C, excluding the entrance effect (see the plot below for the measured temperature profile of a 50mm diameter cavity). The isothermal operation of the heat pipe is completely passive, requires no user servicing, and operates reliably over a long time.

Materials of construction are typically Aluminum, Stainless Steel, Monel, Inconel or Haynes, but other materials or coatings are possible. The heat pipe's inner and outer surfaces are typically oxidized to provide high emissivity. The working fluid used depends on the desired operating temperature range.

Conventional choices include:

Ammonia: -60 - 50°C
Methanol: -20 - 60°C
Water: 20 - 200°C
Cesium: 300 - 600°C
Potassium: 400 - 1,000°C
Sodium: 500 - 1,100°C
Lithium: 900 - 1,600°C

The HPBC is available as a custom designed device, fabricated to specific size, configuration, containment and temperature requirements. While ACT's main focus is the HPBC, we also provide entire blackbody assemblies including heating/cooling elements and temperature controllers.

Product Benefits:

Uniform Surface Temperature
Low Operating Costs
Passive, Vibration-Free Operation

责任编辑: banye 参与评论