Owing to the fact that the vertical one-pipe-series-loop heating system for existing house in China is not closed loop system,the metered heating can be realized only by heat cost allocator.

• 通过计算和分析，提出垂直失调不是单管顺流式供暖系统固有的特点，同时根据实际使用效果，分析了采用顺流式和跨越式相结合的供暖系统不能明显改善垂直失调的原因。