According to the invention the flows through the primary or secondary side of the heat exchanger is at each time continuously controlled by a parameter being a function of both the actual temperature and {HEAD ~ the actual fluid volume} in {TAIL ~ said accumulator tank}  
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According to the invention the flows through the primary or secondary side of the heat exchanger is at each time continuously controlled by a parameter being a function of both the actual temperature and { HEAD ~ the actual fluid volume } in { TAIL ~ said accumulator tank }
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