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 {HEAD ~ a function} of {TAIL ~ both the actual temperature} and the actual fluid volume in said accumulator tank  
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 { HEAD ~ a function } of { TAIL ~ both the actual temperature } and the actual fluid volume in said accumulator tank
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH