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Study on a new ventilation system using ground heat collector of vertical double pipe. 2. Prediction of heat collector performanceand methods to improve performance.

Author(s) : NAKAMURA Y., HASHIMOTO M., SHIGYO T.

Summary

A ventilation and air-conditioning system using the ground heat was developed as one of the techniques using renewable energy. In the system, vertical double pipe type of heat collector is used. The authors developed a code, which is able to solve unsteady three dimensional heat conduction equation, heat balance equation at the ground surface and heat transfer equation from the heat collector to the ground simultaneously, to predict the performance of the heat collector. Main results are as follows: the outlet air temperature of the heat collector becomes higher/lower at most 7°C than the inlet air; the performance of the heat collector increases with the length of the heat collector and increases with the heat conductivity of the soil; continuous operation of the system over a year contributes to improvement of the performance of the heat collector both in winter and in summer.

Details

  • Original title: Study on a new ventilation system using ground heat collector of vertical double pipe. 2. Prediction of heat collector performanceand methods to improve performance.
  • Record ID : 2008-2640
  • Languages: English
  • Source: Clima 2007. WellBeing Indoors. Proceedings of the 9th REHVA World Congress [CD-ROM + Abstract book].
  • Publication date: 2007/06/10

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