World Premiere: HeatFlow measurements at great depths (10.000m)

10.000m equates to 1000bar – that’s quite a lot. The mean depth of the world ocean is ‘only’ about 3.700m but the great deep sea plains are below that and the tectonic trenches often reach water depths well in the 7-8-thousand meter range. However, so far only 12 locations are known where the ocean depth exceeds 10.000m from which the deepest is the so-called Vityaz Deep (a part of the Challenger Deep, cf. https://en.wikipedia.org/wiki/Challenger_Deep). We proudly announce that we have managed to modify our well-established measuring system to resist 1000bar of outer pressure and herewith present the new model HeatFlowProbe UD (UD for Ultra Deep). You are invited to find out about heat flow in the greatest depths of the ocean (as long as your wire is long enough…). Read more...

Review article about sediment temperatures and 2K-criterion available online

A team of scientists from FIELAX has submitted a manuscript about the variability of sediment temperatures and the so-called 2K-criterion to the Elsevier journal ‘Applied Thermal Engineering’. The manuscript: /Temperatures in shallow marine sediments: Influence of thermal properties, seasonal forcing, and man-made heat sources/ was accepted today and is available under the following link: http://www.sciencedirect.com/science/article/pii/S1359431116312364 Highlights of this article are: Sediment thermal properties are highly variable. Seasonal forcing causes large spatial and temporal sediment temperature variations. Power cable temperatures strongly depend on thermal properties of a given site. The 2K-criterion is not suitable to detect man-made heat injection. Read more...

FIELAX reaches new depths: 5432m to be exact!

FIELAX likes to announce the successful performance of a heat flow measurement in a water depth of more than 5400m. On board the RV Investigator, FIELAX has performed heat flow measurements in the Bight Basin (Offshore South Australia) for the Commonwealth Scientific and Industrial Research Organisation (CSIRO), in cooperation with Chevron. The deepest station measurment was performed in 5432m water depth, a new record for FIELAX and our equipment. Read more...

Modelling

FIELAX presents its latest development: 2D and 3D temperature evolution calculations in marine sediments. The models incorporate the geothermal heat flow, measured thermal properties of the sediments as well as temperature variations through seasonal variations of the bottom water temperature. As a result the models determine temperature distributions resulting from superimposition of seasonal, natural temperatures and those induced by internal sources such as power cables, the latter also time-dependent. The Cable Route Model is a full model for the temperature field in and around submarine power cables. The model includes heterogeneous properties of the sediments, seasonal heating and cooling through bottom water temperature variations, and heating thgough time-dependent power loss from the cable. Applications are the 2k-criterion or the dimensioning of subsea power cables (PDF-Flyer). The 3D temperature model has been developed to calculate temperature fields in marine sediments or onshore soil. Given inputs are measured thermal properties and approximated seasonal temperature deviations of the water/air. Thus, the seasonal effects as well as influences from heat sinks- and sources (such as energy cables or heat exchangers) may be modelled. Read our “Prediction of Sediment Temperatures” (PDF) brochure for detailed information: Read more...

Heat Flow Services

Heat flow measurement and data interpretation We offer worldwide heat flow measurements for marine research and offshore industries as well as data interpretation. A typical heat flow measurement campaign covers: Rental or sale of equipment and optional delivery/freight Experienced and safety trained offshore surveyors Operation of the heat flow instruments on board during station work Preliminary data quality check on board Data interpretation and analysis on land The resulting dataset of a heat flow measurement station typically contains: Temperatures over penetration depth and time Thermal conductivities over penetration depth Specific heat capacity over penetration depth Calculated heat flow of the station Read more...