Thermodynamic efficiency of heat pump air conditioning system based on vertical ground heat exchanger

Authors

  • M. Bezrodny National Technical University of Ukraine "Ihor Sikorsky Kyiv Polytechnic Institute" , Національний технічний університет України «Київський політехнічний інститут імені Ігоря Сікорського»
  • S. Oslovskyi National Technical University of Ukraine "Ihor Sikorsky Kyiv Polytechnic Institute" , Національний технічний університет України «Київський політехнічний інститут імені Ігоря Сікорського»

DOI:

https://doi.org/10.31548/energiya3(67).2023.074

Abstract

An analysis of literary sources in which heat pump heating and air conditioning systems were studied over the past 10 years was carried out. It was determined that research for heat pumps using vertical soil heat exchangers was conducted more in the empirical plane. The authors analyzed the effectiveness of using existing systems that work for heating and air conditioning in different countries. The results of many studies are given, which show that, in fact, the use of ground heat pumps in a temperate climate only in the heating mode entails the exhaustion of the thermal potential and the impossibility of its use in the future. Theoretical studies at the system design stage are not sufficiently presented, and the issue of predictioning the efficiency of the use of such systems is not disclosed. In this regard, it is proposed to investigate the energy efficiency of the heat-pump air conditioning system based on vertical soil heat exchangers.

A heat pump air conditioning system based on a vertical soil heat exchanger is considered. Two research tasks were defined: analysis of efficiency in active and passive modes of conditioning. A thermodynamic analysis of the efficiency of the proposed scheme was carried out. The main operating parameters of the system at nodal points are defined. With the help of balance equations, the framework of the system's operation in passive and active modes according to the main parameters is determined. Graphical dependences of energy efficiency indicators on the determining parameters of the system were constructed and analyzed. It is shown at which parameter values the system has optimal operating costs. The results of the study are compared with those for the split system. The advantages and disadvantages of using the proposed solution are determined. It was determined that the heat pump system using soil heat for air conditioning with a vertical soil heat exchanger has stricter requirements for the thermal insulation of the air conditioning object than the system based on the air heat pump.

Key words: air conditioning, heat pump, energy efficiency, ground heat exchanger, soil heat, passive cooling mode, energy efficiency ratio

References

Kaygusuz, K. (2009). Energy and environmental issues relating to greenhouse gas emissions for sustainable development in Turkey. Renewable and Sustainable Energy Reviews, 13, 253–270.

Ma, Z., Wang, S. (2009). Building energy research in Hong Kong: a review. Renewable and Sustainable Energy Reviews, 13, 1870–1883.

Wan, K., Li, D., Pan, W., Lam, J. (2012). Impact of climate change on building energy use in different climate zones and mitigation and adaptation implications. Applied Energy, 97, 274–282.

Ma, Z., Ren, H., Lin, W. (2019). A review of heating, ventilation and air conditioning technologies and innovations used in solar-powered net zero energy Solar Decathlon houses. Journal of Cleaner Production, 240, 148-158.

Wang, Z., Wang, F., Liu, J., Ma, Z., Han, E., Song, M. (2017). Field test and numerical investigation on the heat transfer characteristics and optimal design of the heat exchangers of a deep borehole ground source heat pump system. Energy Conversion and Management, 153, 603–615.

Sarbu, I., Sebarchievici, C. (2014). General review of ground-source heat pump systems for heating and cooling of buildings. Energy and Buildings, 70, 441–454.

Omer, A. M. (2017). Ground-source heat pump systems and applications. Renewable and Sustainable Energy Reviews, 10, 123-134.

Lund, J. W. (2020). Ground source (geothermal) heat pumps. In: Lineau P. J., editor. Course on heating with geothermal energy: conventional and new schemes. World geothermal congress 2020 short courses. Kazuno, Tohuko District, Japan, 2020, 1–21.

Sanner, B., Karytsas, C., Mendrinos, D., Rybach, L. (2013). Current status of ground source heat pumps and underground thermal storage in Europe. Geothermics, 32, 579–588.

Hepbasli, A., Akdemir, O., Hancioglu, E. (2013). Experimental study of a closed loop vertical ground source heat pump system. Energy Conversion and Management, 44, 527–548.

Hepbasli, A. Thermodynamic analysis of a ground-source heat pump system for district heating. International Journal of Energy Research, 7, 671–687.

Akpinar, E., Hepbasli, A. A. (2017). Comparative study on exergetic assessment of two ground source (geothermal) heat pump systems for residential applications. Building and Environmen, 42, 2004–2013.

Petit, P. J., Meyer, J. P. A. (2017). Techno-economic analysis comparison of the performance of air-source and horizontal ground-source air conditioners in South Africa. International Journal of Energy Research, 21, 1011–1021.

De Swartdt, C. A, Meyer, J. P. (2021). A performance comparison between an air source and a ground source reversible heat pump. International Journal of Energy Research, 25, 899–910.

Liu, Z., Xu, W., Qian, C., Chen, X., Jin, G. (2015). Investigation on the feasibility and performance of ground source heat pump (GSHP) in three cities in cold climate zone, China. Renewable Energy, 19, 76-89.

Yang, W., Chen, Y., Shi, M., Spitler, J. D. (2013). Numerical investigation on the underground thermal imbalance of ground-coupled heat pump operated in coolingdominated district. Applied Thermal Engineering, 58, 627-637.

Pandey, N., Murugesan, K., Thomas, H. R. (2017). Optimization of ground heat exchangers for space heating and cooling applications using Taguchi method and utility concept. Applied Energy, 190, 421-438.

Bezrodny, M. K., Pritula N.O. (2016). Termodynamichna ta enerhetychna efektyvnist teplonasosnykh skhem teplopostachannia [Thermodynamic and energy efficiency of heat pump heat supply circuits]: monography. Kyiv: NTUU "KPI" View "Polytechnic", 272.

Bezrodny, M., Kutra, D. (2015). Efektyvnist teplonasosnykh system kondytsiiuvannia povitria [Efficiency of heat pump air conditioning systems]. Kyiv: NTUU "KPI" View "Polytechnic", 172.

Strelchuk, O., Sizov, O. (2013). DBN V.2.5-67:2013 "Opalennia, ventyliatsiia ta kondytsionuvannia" [DBN V.2.5-67:2013 Heating, ventilation and air conditioning]. Kyiv: SE "Ukrakhbudinform", 141.

Downloads

Published

2023-09-07

Issue

No. 3 (2023)

Section

Статті

License

Relationship between right holders and users shall be governed by the terms of the license Creative Commons  Attribution – non-commercial – Distribution On Same Conditions 4.0 international (CC BY-NC-SA 4.0):https://creativecommons.org/licenses/by-nc-sa/4.0/deed.uk

Authors who publish with this journal agree to the following terms:

  • Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
  • Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
  • Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).