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Distributed temperature measurements on a u-pipe thermosiphon borehole heat exchanger with CO2.

Author(s) : ACUÑA J., PALM B., KHODABANDEH R., et al.

Summary

In thermosiphon borehole heat exchangers, a heat carrier fluid circulates while exchanging heat with the ground without the need for a circulation pump, representing an interesting alternative when compared to other more conventional systems. Normally, the fluid is at liquid-vapour saturation conditions and circulation is maintained by density differences between the two phases as the fluid absorbs energy from the ground. This paper presents some experimental results from a 65 meter deep thermosiphon borehole heat exchanger loop using CO2 as heat carrier fluid, instrumented with a fiber optic cable for distributed temperature measurements along the borehole depth. The heat exchanger consists of an insulated copper tube through which liquid CO2 flows downwards, and a copper tube acting as a riser. The results show temperatures every two meters along the riser, illustrating the heat transfer process in the loop during several heat pump cycles.

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Pages: 2010-2

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Details

  • Original title: Distributed temperature measurements on a u-pipe thermosiphon borehole heat exchanger with CO2.
  • Record ID : 2010-0744
  • Languages: English
  • Source: 9th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2010). Proceedings. Sydney, Australia, April 12-14, 2010.
  • Publication date: 2010/04/12

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