A Comprehensive Study on Intermittent Operation of Horizontal Deep Borehole Heat Exchangers
Utilizing a deep Borehole Heat Exchanger (BHE) has been recognized as a clean, renewable, low-carbon-emission, and sustainable way for heating of residential buildings and greenhouses. In this study, the long-term performance of horizontal deep BHE in intermittent mode is scrutinized. In this regard...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-01-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/15/1/307 |
| _version_ | 1797499075850928128 |
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| author | Ingen Perser Ian Alistair Frigaard |
| author_facet | Ingen Perser Ian Alistair Frigaard |
| author_sort | Ingen Perser |
| collection | DOAJ |
| description | Utilizing a deep Borehole Heat Exchanger (BHE) has been recognized as a clean, renewable, low-carbon-emission, and sustainable way for heating of residential buildings and greenhouses. In this study, the long-term performance of horizontal deep BHE in intermittent mode is scrutinized. In this regard, to predict the transient heat transfer process in the deep BHEs, a mathematical model is developed and then verified by using the experimental results. The effect various key parameters including flow rate of circulating fluid, undisturbed ground temperature, inlet fluid temperature, and ground thermal conductivity on the thermal performance of deep BHE in continuous and intermittent mode is studied. According to the results, increasing the flow rate of circulating fluid, undisturbed ground temperature, and ground thermal conductivity is favorable for heat extraction rate. Moreover, the effect of three specific parameters for intermittent operation including periodic time interval, flow rate ratio, and recovery period ratio on the long-term performance of horizontal deep BHE are scrutinized. Based on the results, by decreasing the periodic time interval and increasing the flow rate ratio, the mean heat extraction rate in the period of 30 years is increased and the mean borehole’s wall temperature is decreased. Furthermore, by increasing the recovery period ratio, the heat extraction rate increases significantly while the total extracted energy decreases. |
| first_indexed | 2024-03-10T03:42:15Z |
| format | Article |
| id | doaj.art-292bfef59d1a44e6ac67e24e36e6065b |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T03:42:15Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-292bfef59d1a44e6ac67e24e36e6065b2023-11-23T11:28:42ZengMDPI AGEnergies1996-10732022-01-0115130710.3390/en15010307A Comprehensive Study on Intermittent Operation of Horizontal Deep Borehole Heat ExchangersIngen Perser0Ian Alistair Frigaard1Department of Mechanical Engineering, University of British Columbia, 2054-6250 Applied Science Lane, Vancouver, BC V6T 1Z4, CanadaDepartment of Mechanical Engineering, University of British Columbia, 2054-6250 Applied Science Lane, Vancouver, BC V6T 1Z4, CanadaUtilizing a deep Borehole Heat Exchanger (BHE) has been recognized as a clean, renewable, low-carbon-emission, and sustainable way for heating of residential buildings and greenhouses. In this study, the long-term performance of horizontal deep BHE in intermittent mode is scrutinized. In this regard, to predict the transient heat transfer process in the deep BHEs, a mathematical model is developed and then verified by using the experimental results. The effect various key parameters including flow rate of circulating fluid, undisturbed ground temperature, inlet fluid temperature, and ground thermal conductivity on the thermal performance of deep BHE in continuous and intermittent mode is studied. According to the results, increasing the flow rate of circulating fluid, undisturbed ground temperature, and ground thermal conductivity is favorable for heat extraction rate. Moreover, the effect of three specific parameters for intermittent operation including periodic time interval, flow rate ratio, and recovery period ratio on the long-term performance of horizontal deep BHE are scrutinized. Based on the results, by decreasing the periodic time interval and increasing the flow rate ratio, the mean heat extraction rate in the period of 30 years is increased and the mean borehole’s wall temperature is decreased. Furthermore, by increasing the recovery period ratio, the heat extraction rate increases significantly while the total extracted energy decreases.https://www.mdpi.com/1996-1073/15/1/307renewable energyheat transferdeep borehole heat exchangerspace heatingintermittent operation |
| spellingShingle | Ingen Perser Ian Alistair Frigaard A Comprehensive Study on Intermittent Operation of Horizontal Deep Borehole Heat Exchangers Energies renewable energy heat transfer deep borehole heat exchanger space heating intermittent operation |
| title | A Comprehensive Study on Intermittent Operation of Horizontal Deep Borehole Heat Exchangers |
| title_full | A Comprehensive Study on Intermittent Operation of Horizontal Deep Borehole Heat Exchangers |
| title_fullStr | A Comprehensive Study on Intermittent Operation of Horizontal Deep Borehole Heat Exchangers |
| title_full_unstemmed | A Comprehensive Study on Intermittent Operation of Horizontal Deep Borehole Heat Exchangers |
| title_short | A Comprehensive Study on Intermittent Operation of Horizontal Deep Borehole Heat Exchangers |
| title_sort | comprehensive study on intermittent operation of horizontal deep borehole heat exchangers |
| topic | renewable energy heat transfer deep borehole heat exchanger space heating intermittent operation |
| url | https://www.mdpi.com/1996-1073/15/1/307 |
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