FC-3. Cooling vs weight and size

Imagine you are the sales manager at a factory producing frequency converters (FC). Answer the questions in the two requests (solve the two problems).

Request 1. FC for a pump

Pump parameters:

• Rated flow 50 l/s, head 200 m, efficiency 81%, speed 1450 rpm

There is avaiable a cubicle where the FC can be potentially placed. At the moment there is old motor starter in this cubicle to start this particular pump, so the idea is to replace the motor started with the new FC. Cubicle dimensions (Depth x Height x Width): 0,5 x 1,2 x 0,4 m. Cooling water is available. Will the new FC fit the cubicle?

Request 2. FC for a wind turbine

There is a plan to upgrade of the WT product line from 1 to 1,5 MW. This will require changing the blades design.

The new wind turbine: rated speed of the blades 20 rpm, overspeed 1,2, torque 750 kNm, 2-stage gearbox with ratio 1:30. Grid 6000 V.

The plan to reuse the same nacelle. Place available for the new FC (footprint 6 m2, volume 4m3) remains the same as in the 1 MW nacelle. Former 1 MW drive train was air-cooled. It is decided to arrange water cooling, so air-to-water heat exchanger will be available (installed in the tower). Will the new 1,5 MW FC fit the available place?