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Optimisation of a novel dry air-ground source (DAGS) heat pump system.

Number: 0954

Author(s) : YEBIYO M., BADRAN B. E., STIGNOR C. H., AXELL M., GUSTAFSSON O.

Summary

Ground temperatures will often fluctuate in response to heat absorption or rejection. It is important to recognize that the ground is not an infinite energy source and that it is appropriate to prevent excessive heat extraction or rejection of the ground. Significant changes in ground temperature are likely to occur if exorbitant heat extraction rates from or rejection to the ground are tolerated for long periods. These variations in the ground temperature can have major adverse effects on the coefficient of performance (COP) of a ground source heat pump (GSHP) system and, thus, the system's overall performance. However, one method of regulating ground temperature imbalance is to reject heat when the ground and ambient temperatures favor this through a dry air cooler (DAC). In order to protect the system, rather than to improve performance, DACs are often fitted to GSHP systems to reject heat in extreme conditions. An empirical transient system simulation model (TRNSYS) was developed in this study and used to analyze the control algorithms to determine the optimal operation and control strategies for the GSHP system's performance. Specifically, the paper explores the impact of using a GSHP device with a DAC. This involves examining (i) the input of energy into the GSHP system, (ii) the annual ground temperature variation and (iii) the COP. The results show that considerable savings can be achieved with optimum operation and control strategies for a GSHP system.

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Pages: 15 p.

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Details

  • Original title: Optimisation of a novel dry air-ground source (DAGS) heat pump system.
  • Record ID : 30033524
  • Languages: English
  • Subject: Technology
  • Source: 14th IEA Heat Pump Conference 2023, Chicago, Illinois.
  • Publication date: 2023/05

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