Why are water in tube systems being replaced with glass heat pipes?
Efficiency is better, tubes are stronger with less problems, and cost is almost the same. Water in tube systems mean lower efficiency, since liquid travels slower than vapor in a heat pipe, and one broken tube will cause all the water to leak out. With heat pipes, the collector has high efficiency and keeps working with broken tubes. For these reasons, heat pipe gravity drain systems are the top of Chinese domestic line.
Efficiency is better, tubes are stronger with less problems, and cost is almost the same. Water in tube systems mean lower efficiency, since liquid travels slower than vapor in a heat pipe, and one broken tube will cause all the water to leak out. With heat pipes, the collector has high efficiency and keeps working with broken tubes.
