Universal testing machine GHP 900 S

automatedmaterialthermal

Measuring devices of the GHP 900 S series are cabinet devices with a tiltable test chamber that are well suited for a wide range of applications, those involving especially thicker specimens and insulating glass. The design of the device is such that specimens are inserted into the test chamber from the top. This allows for the insertion of heavy and complex samples without damaging the measuring plates. Data logging and control of the device are handled by the external Lambda Control desktop device alongside a PC with Windows operating system and Lambda software. Cabinet devices with a tiltable test chamber are especially well suited for determining the thermal conductivity and U-value of windows and skylights. The U-value of an insulation glass window depends on the mounting angle (vertical, horizontal or in between) due to different heat transfer conditions within the gas phase. The GHP 900 S is able to measure the thermal conductivity of such insulation glass windows as a function of temperature and mounting angle. Method Thermal Conductivity - A Key Parameter for Improved Energy Efficiency Guarded Hot Plate - Principle of Operation The hot plate and the guard ring are sandwiched between two samples of the same material and approximately the same thickness, d. Cold plates are placed above and below the samples. All plate temperatures are controlled such that a well‐ defined, user‐selectable temperature difference, ΔT, is established between the hot and the cold plates – and thus across the sample thickness. The guard ring is maintained exactly at hot plate temperature in order to minimize lateral heat losses.