GLYCOL COOLING
FEATURE SPONSOR
requirement for cooling systems to cater for the sensitive electronics now found in many modern designs.
The cooling of electronic systems has become a major challenge due to the advancements in the design of faster and smaller components. As a result, different cooling technologies have been developed to efficiently remove the heat from these components without which premature failure will occur resulting in turbine down-time and potential secondary component damage. The use of a liquid coolant has become attractive due to the higher heat transfer coefficient achieved as compared to air-cooling.
REQUIREMENTS FOR A LIQUID COOLANT IN WIND TURBINES There are many requirements for a liquid coolant for use in electronics applications in wind turbines. The requirements may vary depending on the type of application but generally the following list is required…
» Good thermo-physical properties » Low freezing point and burst point » High atmospheric boiling point » Good chemical and thermal
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» Non-corrosive to materials of construction (metals as well as polymers and other non-metals)
stability for the life of the electronics system
A very common type of liquid coolant is Ethylene Glycol. Commonly used as antifreeze in automotive engine cooling, Ethylene Glycol can also be found in many industrial cooling applications. Common applications include process cooling at lower temperatures. Ethylene glycol is colourless (although a dye is often added), practically odourless and is completely miscible with water. When properly inhibited, it has a relatively low corrosivity. However, this coolant is classified as toxic and should be handled and disposed of with care. The quality of water used for the preparation of a glycol solution is very important for the system. Typically, water with low chloride and sulfate ion concentration (< 25 ppm) is recommended.
The effectiveness of the inhibitors in the Ethylene Glycol coolant will reduce over time making a monitoring schedule, or fixed interval coolant
replaced critical to assure that inhibitor depletion is avoided and pH of the solution is consistent.
PROCEDURE TO MEET COOLANT REQUIREMENTS
Step in Peter Lonsdorfer UK, as Barry has perfected a procedure and built the equipment to meet the coolant requirements of the wind turbines and needs of the customer to ensure that a safe, quick and clean method of glycol exchange can be performed keeping them at the forefront of this ever evolving industry as the specialists in carrying out the fluid changes.
IN A NUTSHELL We look forward to catching up with Barry in future issues… not leaving it as long next time!
Fliss Chaffer
Interviewer Extraordinaire Wind Energy Network
Peter Lonsdorfer UK Ltd
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