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System performance investigation and optimization retrofit of an existing GSHP system in the severe cold zone in China.

Ispitivanje karakteristika sistema i rekonstrukcija u cilju optimizacije postojeceg sistema sa geotermalnom toplotnom pumpom u zoni sa oštrim klimatskim uslovima u kini.

Author(s) : CUI P., AN H., JIANG H.

Summary

The energy consumption of some ground source heat pump (GSHP) systems which are currently used in cold regions is significant high due to the improper design, construction or other issues. In this study, an existing GSHP system was chosen to analyze the actual operating performance in cold region by measuring the inlet/outlet water temperatures, circulating fluid flow rate and the power consumption. The heat transfer process of the ground heat exchanger was simulated for 20 years operation by means of a professional GSHP program Geostar. The following several problems of the existing system have been found according to the diagnosis results: (1) The annual underground thermal imbalance is quite serious, due to the longer heating time and the larger heating load compared to the cooling season. In this project, the annual extraction heat in winter was over 3 times amount of the heat rejected during the summer. (2) The number of the buried boreholes is larger for cooling case and insufficient for heating case, which leads to a large fluid flow rate and small temperature difference in summer. (3) Lack of the necessary automatic monitoring equipment and improper management strategies also caused high energy consumption. (4) According to the measured data, the overall COP of the GSHP system was 1.8 in cooling and 1.4 in heating case.

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Pages: 11 p.

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Details

  • Original title: Ispitivanje karakteristika sistema i rekonstrukcija u cilju optimizacije postojeceg sistema sa geotermalnom toplotnom pumpom u zoni sa oštrim klimatskim uslovima u kini.
  • Record ID : 30020190
  • Languages: English
  • Source: 47th International HVAC&R Congress and Exhibition.
  • Publication date: 2016/12

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