[TRNSYS-users] Virtical U- tube

[晨阳]

Dear all,
       I want to simulate a grund heat pump system .Its  ground heat exchanger is double- U- tubes and I want to know that can I use Tpye 557a as the  ground heat exchanger .In my opinion, the Type 557a is a single-U-tube ground heat exchanger ,can I use it as double- U- tubes ground heat exchanger ?If you suggest me do it as that I said above,can you tell me the difference between the using of it as single-U-tube and the using of it as double- U- tubes  in detail?
       Thank you very much !
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