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一、引言早在二十世纪六十年代,芬兰区域供热系统就已经对耗热量进行计量了。七十年代初期对热能使用的巨增,以及能源价格的急
I. INTRODUCTION As early as the 1960s, the Finnish district heating system already measured the amount of heat consumed. The dramatic increase in the use of thermal energy in the early 1970s and the urgency of energy prices