water-waterCOCA³¹⁵¹¹¹⁺⁴ 基本例句 🌏水冷冷水型 A new type of water-water mixing heat exchanger used in the hot water boiler and heating system is discussed. The calculation method and characteristic equations of the heat exchanger are given. 本文对与集中供热热水锅炉配用的新型混合式加热器作了分析，并给出了该加热器的计算方法。 cnki