(FR2747238-A1)      The apparatus a duct (2) with several thermoelectric modules (8) provided within the outer walls of the duct. Hot liquid (4) flows through the duct and the cold water (3) surrounds it. The modules are mounted on both sides of radial copper flanges (6).    The flanges are enclosed and electrically insulated from the water by annular yokes (10) with seals (13) rendering the stress on each module independent of the hydrostatic pressure. Each heat exchange surface is approximately at right angles to the flow (F). The stack is held together in compression by bars (14) arranged axially at the rims of the flanges and clamped between endpieces (15a,15b).    USE/ADVANTAGE -   Especially in underwater oil extraction wellhead. Increased electric power can be supplied at greater depths down to e.g. 2 km.    (EP836751-A1)      The apparatus a duct (2) with several thermoelectric modules (8) provided within the outer walls of the duct. Hot liquid (4) flows through the duct and the cold water (3) surrounds it. The modules are mounted on both sides of radial copper flanges (6).    The flanges are enclosed and electrically insulated from the water by annular yokes (10) with seals (13) rendering the stress on each module independent of the hydrostatic pressure. Each heat exchange surface is approximately at right angles to the flow (F). The stack is held together in compression by bars (14) arranged axially at the rims of the flanges and clamped between endpieces (15a,15b).    USE/ADVANTAGE -   Especially in underwater oil extraction wellhead. Increased electric power can be supplied at greater depths down to e.g. 2 km.    (US5929372-A)      The apparatus a duct (2) with several thermoelectric modules (8) provided within the outer walls of the duct. Hot liquid (4) flows through the duct and the cold water (3) surrounds it. The modules are mounted on both sides of radial copper flanges (6).    The flanges are enclosed and electrically insulated from the water by annular yokes (10) with seals (13) rendering the stress on each module independent of the hydrostatic pressure. Each heat exchange surface is approximately at right angles to the flow (F). The stack is held together in compression by bars (14) arranged axially at the rims of the flanges and clamped between endpieces (15a,15b).    USE/ADVANTAGE -   Especially in underwater oil extraction wellhead. Increased electric power can be supplied at greater depths down to e.g. 2 km.    (EP836751-B1)      The apparatus a duct (2) with several thermoelectric modules (8) provided within the outer walls of the duct. Hot liquid (4) flows through the duct and the cold water (3) surrounds it. The modules are mounted on both sides of radial copper flanges (6).    The flanges are enclosed and electrically insulated from the water by annular yokes (10) with seals (13) rendering the stress on each module independent of the hydrostatic pressure. Each heat exchange surface is approximately at right angles to the flow (F). The stack is held together in compression by bars (14) arranged axially at the rims of the flanges and clamped between endpieces (15a,15b).    USE/ADVANTAGE -   Especially in underwater oil extraction wellhead. Increased electric power can be supplied at greater depths down to e.g. 2 km.