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There are more uses of air cooled heat exchangers, like the upstream production, refineries and petro-chemical facilities. It can also be employed on situations rich in temperature, high pressure, corrosive fluids and environments. Moreover, air coolers could possibly be equipped and found in oil and coal refineries; compressor stations for gas pipelines; subsurface gas storage facilities; plants producing polychlorvinyl, polyethylene, glass fiber, biplastic; caustic soda plants; by-product coke plants and ammonia transportation and handling plants. Tucked away at the bottom of the Theme menu are Basic and High Contrast Themes, these are ideal for those who have difficulty reading against some of the colour schemes or cannot see icons against a busy display. They are also useful if your machine is low on system resources or has an older video card. An average student has to spend three hours of study for every hour spent in class. Fifteen hours a week may be the average time for the university course. Depending upon the university course?s subject, classes may be held throughout the evening, afternoon or in the morning. To support the academic university courses, they might also have to attend the clubs, athletics, recreational activities and societies.