The Heat Flow Meter (HFM-25) for testing thermal resistance and thermal conductivity of insulation and construction materials. Offering the testing power of a full-size heat flow meter, optimized for small insulation samples and budget. The HFM-25 is controlled by the included HFM Software, offering automation of calibration, testing and results summary functions.
Following international standards, the HFM-25 is designed for testing both homogenous and heterogenous materials and complies with ASTM C518. The HFM-25 allows for smaller sample sizes which are representative of materials typically found in insulation and construction industries.
For small samples (min 50 x 50 mm), samples can easily be arranged for simple testing.
For larger samples (no maximum), samples can conveniently measured at a specific location.
In this experiment, the thermal conductivity of Spaceloft Subsea Aerogel insulation of 9.58 mm thick from Aspen Aerogels was measured with the Thermtest HFM-25. Aerogel is a lightweight solid derived from gel in which the liquid component has been replaced with air. This process creates a solid material with two interesting properties: an extremely low density and extremely low thermal conductivity of this solid. The temperature of the upper plate was 35°C and the lower plate was 15°C, obtaining an optimal temperature delta of 20 degrees.
Table 1: Results of the average thermal conductivity and thermal resistance of Subsea Spaceloft Aerogel sample.
|Measured Thermal Conductivity (W/m·K)||Expected Thermal Conductivity (W/m·K)|
Reference: Reference: aerogel.com/wp-content/uploads/2021/08/Spaceloft-Subsea-Datasheet.pdf – Measured via ASTM C177. Sample measured by Thermtest using ASTM C518.