For HCFC22, the enhancement of condensation heat transfer outside two kinds of enhanced tubes versus the plaintube is larger than that for R407C.
对于所试验的两种强化管，HCFC22的管外冷凝换热系数的强化效果比R407C更明显。
2
Therefore, using steel spirally fluted tube replacing copper plaintube in HP preheater can be adopted for the boiler feedwater system without copper.
因此，可以采用钢质螺旋槽管替代低压加热器中的铜光滑管，实现锅炉给水系统无铜化运行的要求。
3
The performance and hysteresis of boiling heat transfer of T-tube with different opening, low fin tube, and two kind of plain tubes have been studied experimentally.