NanoPore Home
Company Information
Products
Specialty Materials
Patents
Employment
Contact NanoPore

For more information on NanoPore™ Thermal Insulation:
Thermal Insulation Links:
• Vacuum Panels
• Applications
   • Insulated Shipping
   • High Temperature
   • Cryogenic
   • Pipes & Pipeline

 
Thermal Insulation Low K Dielectrics Adsorption Cooling

Cryogenic Applications


Cryogenic
applications such as for liquid nitrogen, oxygen, argon, carbon dioxide, and liquefied natural gas are natural applications for the use of NanoPore™ based vacuum panels because of the very high temperature driving forces between ambient temperature and the liquid temperature. Examples include transfer piping, dewars for storage and transportation, insulation for low temperature devices, and low temperature freezers. The performance of all insulation varies as a function of temperature. For cryogenic applications, the performance of insulation improves over the room temperature performance. A graph of both thermal conductivity and R-value for NanoPore™ based insulation products at various temperaures is shown below (note temperatures are in Kelvin).

Because of the large thermal gradients, the insulation value of importance is the mean value averaged over the values on the cold and hot side. A demonstration of the performance of NanoPore™ VIP insulation versus conventional insulations in a liquid nitrogen storage test is given below.


Case Study - Liquid Nitrogen Boiloff

A four liter plastic (PET) box with dimensions of 140 x 140 x 200 mm was surrounded with insulation panels. On all sides but the top, the edges were sealed. Liquid nitrogen evaporation (measured gravimetrically) was used for either NanoPore™ VIPs or 1” polyurethane insulation backed with foil on both sides. The NanoPore™ panels had a thickness of either 12 mm (” nominal) or 24.5 mm (1” nominal). Polyurethane boxes were built up using one, two, or three layers of 1” insulation. The nitrogen boiloff loss from these various insulation configurations are shown below. Duplicate tests of the 1” vacuum panel tests are also included. Small differences in the starting weight simply reflect slight changes in the liquid level when we started taking rate measurements. In all cases, the ambient temperature during the measurements was between 20 and 22C.

It can be seen in the figure above that the " VIP insulated container exhibited a lower boiloff rate than the container insulated with 3" of polyurethane foam. The calculated R value per inch for the VIPs in this configuration is R57/inch, while the value calculated for the foam insulated containers is R11/inch. While the performance of both insulation improves under low temperatures, the NanoPore™ VIPs provide more than 5 times better performance!

2008 NanoPore Incorporated All rights reserved.
Comments, suggestions or problems ? Contact webmaster@nanopore.com