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Dynamic performance of ground-source heat pumps fitted with frequency inverters for part-load control

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  • Lee, C.K.

Abstract

A model for a ground-source heat pump (GSHP) fitted with a variable-speed compressor was developed. A frequency inverter (FI) was used to modulate the GSHP capacity for improving the part-load performance of the system. Year-round dynamic simulations were made using TRNSYS for a general office based on the weather conditions in Hong Kong (HK), Kunming (KM) and Beijing (BJ). Different control schemes for the part-load control were tried and the results compared. It was found that the adoption of a variable-speed part-load control to the GSHP in both the cooling and heating mode operations was better. A reduction in the compressor energy input by minimum 27% could be achieved although a slight increase in the borefield fluid circulating pump energy consumption was inevitable. The peak borefield fluid temperatures were also reduced which allowed the borehole lengths to be shortened by at least 4% and the initial cost lowered accordingly. An economic analysis indicated that with the reduced borehole lengths, the payback periods were no longer than 0.4Â months. This highlighted the merit of employing a variable-speed part-load in a GSHP system as the initial cost might also be saved besides the running costs under a wide range of climatic conditions.

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  • Lee, C.K., 2010. "Dynamic performance of ground-source heat pumps fitted with frequency inverters for part-load control," Applied Energy, Elsevier, vol. 87(11), pages 3507-3513, November.
    • Handle: RePEc:eee:appene:v:87:y:2010:i:11:p:3507-3513
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    1. Lee, C.K. & Lam, H.N., 2008. "Computer simulation of borehole ground heat exchangers for geothermal heat pump systems," Renewable Energy, Elsevier, vol. 33(6), pages 1286-1296.
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    2. Rongjiang Ma & Xianlin Wang & Ming Shan & Nanyang Yu & Shen Yang, 2020. "Recognition of Variable-Speed Equipment in an Air-Conditioning System Using Numerical Analysis of Energy-Consumption Data," Energies, MDPI, vol. 13(18), pages 1-14, September.
    3. Bansal, Vikas & Misra, Rohit & Agarwal, Ghanshyam Das & Mathur, Jyotirmay, 2013. "Transient effect of soil thermal conductivity and duration of operation on performance of Earth Air Tunnel Heat Exchanger," Applied Energy, Elsevier, vol. 103(C), pages 1-11.
    4. Lee, C.K. & Lam, H.N., 2013. "A simplified model of energy pile for ground-source heat pump systems," Energy, Elsevier, vol. 55(C), pages 838-845.
    5. Arun Shankar, Vishnu Kalaiselvan & Umashankar, Subramaniam & Paramasivam, Shanmugam & Hanigovszki, Norbert, 2016. "A comprehensive review on energy efficiency enhancement initiatives in centrifugal pumping system," Applied Energy, Elsevier, vol. 181(C), pages 495-513.
    6. Fong, K.F. & Lee, C.K. & Lin, Z., 2019. "Investigation on effect of indoor air distribution strategy on solar air-conditioning systems," Renewable Energy, Elsevier, vol. 131(C), pages 413-421.
    7. Ozyurt, Omer & Ekinci, Dundar Arif, 2011. "Experimental study of vertical ground-source heat pump performance evaluation for cold climate in Turkey," Applied Energy, Elsevier, vol. 88(4), pages 1257-1265, April.
    8. Bagdanavicius, Audrius & Jenkins, Nick, 2013. "Power requirements of ground source heat pumps in a residential area," Applied Energy, Elsevier, vol. 102(C), pages 591-600.
    9. Eloisa Di Sipio & David Bertermann, 2017. "Factors Influencing the Thermal Efficiency of Horizontal Ground Heat Exchangers," Energies, MDPI, vol. 10(11), pages 1-21, November.
    10. Lee, C.K., 2011. "Effects of multiple ground layers on thermal response test analysis and ground-source heat pump simulation," Applied Energy, Elsevier, vol. 88(12), pages 4405-4410.
    11. Yoon, Seok & Lee, Seung-Rae & Kim, Min-Jun & Kim, Woo-Jin & Kim, Geon-Young & Kim, Kyungsu, 2016. "Evaluation of stainless steel pipe performance as a ground heat exchanger in ground-source heat-pump system," Energy, Elsevier, vol. 113(C), pages 328-337.
    12. Bansal, Vikas & Misra, Rohit & Agarwal, Ghanshyam Das & Mathur, Jyotirmay, 2013. "‘Derating Factor’ new concept for evaluating thermal performance of earth air tunnel heat exchanger: A transient CFD analysis," Applied Energy, Elsevier, vol. 102(C), pages 418-426.
    13. Li, Chao & Jiang, Chao & Guan, Yanling & Tan, Zijing & Zhao, Zhiqiang & Zhou, Yang, 2022. "Development and applicability of heat transfer analytical model for coaxial-type deep-buried pipes," Energy, Elsevier, vol. 255(C).
    14. Poppi, Stefano & Bales, Chris & Heinz, Andreas & Hengel, Franz & Chèze, David & Mojic, Igor & Cialani, Catia, 2016. "Analysis of system improvements in solar thermal and air source heat pump combisystems," Applied Energy, Elsevier, vol. 173(C), pages 606-623.
    15. Liu, Long & Zhu, Neng & Zhao, Jing, 2016. "Thermal equilibrium research of solar seasonal storage system coupling with ground-source heat pump," Energy, Elsevier, vol. 99(C), pages 83-90.
    16. Yang, YauBin & Wu, Min-Der & Chang, Yu-Choung, 2014. "Temperature control of the four-zone split inverter air conditioners using LMI expression based on LQR for mixed H2/H∞," Applied Energy, Elsevier, vol. 113(C), pages 912-923.
    17. Capozza, Antonio & De Carli, Michele & Zarrella, Angelo, 2013. "Investigations on the influence of aquifers on the ground temperature in ground-source heat pump operation," Applied Energy, Elsevier, vol. 107(C), pages 350-363.

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