Share

IIR document

Thermal performance of underground heat exchanger for ground source heat pump that uses direct expansion method.

Number: pap. n. 649

Author(s) : OKAZAWA R., TAKEDA T., ISHIGURO S.

Summary

The specifications of an underground heat exchanger used for a ground source heat pump that uses the direct expansion method could not be established thus far because the refrigerant flowing in the underground heat exchanger is a gas–liquid two-phase flow accompanying evaporation and condensation that exhibits a complicated behavior. Therefore, an experiment was conducted using a U-shaped heat exchanger in which one 3/8-inch copper tube and multiple 1/4-inch copper tubes were connected at the bottom as a heat-collecting tube. In this experiment, parallel underground heat exchangers were used. We introduce this underground heat exchanger into the air-conditioner used for an actual agricultural vinyl house and describe the results of the demonstration test. The coefficient of performance in the cooling and heating operations were approximately 4.0 and 3.5, respectively, and the primary energy consumption reduction rates compared with the conventional system were 20% and 43%, respectively.

Available documents

Format PDF

Pages: 8

Available

  • Public price

    20 €

  • Member price*

    Free

* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).

Details

  • Original title: Thermal performance of underground heat exchanger for ground source heat pump that uses direct expansion method.
  • Record ID : 30026469
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.0649

Links


See other articles from the proceedings (632)
See the conference proceedings

Indexing