A New Simulation Model for Vertical Spiral Ground Heat Exchangers Combining Cylindrical Source Model and Capacity Resistance Model
Considering the heat capacity inside vertical spiral ground heat exchanger (VSGHEX) in the simulation is one of the most noteworthy challenge to design the ground source heat pump (GSHP) system with VSGHEXs. In this paper, a new simulation model for VSGHEXs is developed by combining the ICS model wi...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-03-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/13/6/1339 |
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| author | Takao Katsura Takashi Higashitani Yuzhi Fang Yoshitaka Sakata Katsunori Nagano Hitoshi Akai Motoaki OE |
| author_facet | Takao Katsura Takashi Higashitani Yuzhi Fang Yoshitaka Sakata Katsunori Nagano Hitoshi Akai Motoaki OE |
| author_sort | Takao Katsura |
| collection | DOAJ |
| description | Considering the heat capacity inside vertical spiral ground heat exchanger (VSGHEX) in the simulation is one of the most noteworthy challenge to design the ground source heat pump (GSHP) system with VSGHEXs. In this paper, a new simulation model for VSGHEXs is developed by combining the ICS model with the CaRM. The developed simulation model can consider the heat capacity inside VSGHEX and provide dynamic calculation with high speed and appropriate precision. In order to apply the CaRM, the equivalent length was introduced. Then, the equivalent length was approximated by comparing the results of the CaRM and the numerical calculation. In addition, the calculation model of the VSGHEX was integrated into the design and simulation tool for the GSHP system. The accuracy of the tool was verified by comparing with the measurements. The error between supply temperatures of the measurements and calculation is approximately 2 °C at the maximum. Finally, assuming GSHP systems with VSGHEXs, whose spiral diameter was 500 mm and depth was 4 m, were installed in residential houses in Japan, the required numbers of VSGHEXs were estimated. The results showed a strong correlation between the total heating or cooling load and the required number. Therefore, the required number can be estimated by using the simplified approximate equation. |
| first_indexed | 2024-04-14T02:20:48Z |
| format | Article |
| id | doaj.art-143204678e9f4a41b1292e4c271a122d |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-14T02:20:48Z |
| publishDate | 2020-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-143204678e9f4a41b1292e4c271a122d2022-12-22T02:18:02ZengMDPI AGEnergies1996-10732020-03-01136133910.3390/en13061339en13061339A New Simulation Model for Vertical Spiral Ground Heat Exchangers Combining Cylindrical Source Model and Capacity Resistance ModelTakao Katsura0Takashi Higashitani1Yuzhi Fang2Yoshitaka Sakata3Katsunori Nagano4Hitoshi Akai5Motoaki OE6Faculty of Engineering, Hokkaido University, N13-W8, Kita-ku, Sapporo 060-8628, JapanFaculty of Engineering, Hokkaido University, N13-W8, Kita-ku, Sapporo 060-8628, JapanFaculty of Engineering, Hokkaido University, N13-W8, Kita-ku, Sapporo 060-8628, JapanFaculty of Engineering, Hokkaido University, N13-W8, Kita-ku, Sapporo 060-8628, JapanFaculty of Engineering, Hokkaido University, N13-W8, Kita-ku, Sapporo 060-8628, JapanFaculty of Engineering, Hokkaido University, N13-W8, Kita-ku, Sapporo 060-8628, JapanINOAC Housing & Construction Materials Co., Ltd., 4-9-27 Taihou, Atsuta-ku, Nagoya 456-0062, JapanConsidering the heat capacity inside vertical spiral ground heat exchanger (VSGHEX) in the simulation is one of the most noteworthy challenge to design the ground source heat pump (GSHP) system with VSGHEXs. In this paper, a new simulation model for VSGHEXs is developed by combining the ICS model with the CaRM. The developed simulation model can consider the heat capacity inside VSGHEX and provide dynamic calculation with high speed and appropriate precision. In order to apply the CaRM, the equivalent length was introduced. Then, the equivalent length was approximated by comparing the results of the CaRM and the numerical calculation. In addition, the calculation model of the VSGHEX was integrated into the design and simulation tool for the GSHP system. The accuracy of the tool was verified by comparing with the measurements. The error between supply temperatures of the measurements and calculation is approximately 2 °C at the maximum. Finally, assuming GSHP systems with VSGHEXs, whose spiral diameter was 500 mm and depth was 4 m, were installed in residential houses in Japan, the required numbers of VSGHEXs were estimated. The results showed a strong correlation between the total heating or cooling load and the required number. Therefore, the required number can be estimated by using the simplified approximate equation.https://www.mdpi.com/1996-1073/13/6/1339ground source heat pump systemvertical spiral ground heat exchangerborehole thermal storageinfinite cylindrical sourcecapacity resistance model |
| spellingShingle | Takao Katsura Takashi Higashitani Yuzhi Fang Yoshitaka Sakata Katsunori Nagano Hitoshi Akai Motoaki OE A New Simulation Model for Vertical Spiral Ground Heat Exchangers Combining Cylindrical Source Model and Capacity Resistance Model Energies ground source heat pump system vertical spiral ground heat exchanger borehole thermal storage infinite cylindrical source capacity resistance model |
| title | A New Simulation Model for Vertical Spiral Ground Heat Exchangers Combining Cylindrical Source Model and Capacity Resistance Model |
| title_full | A New Simulation Model for Vertical Spiral Ground Heat Exchangers Combining Cylindrical Source Model and Capacity Resistance Model |
| title_fullStr | A New Simulation Model for Vertical Spiral Ground Heat Exchangers Combining Cylindrical Source Model and Capacity Resistance Model |
| title_full_unstemmed | A New Simulation Model for Vertical Spiral Ground Heat Exchangers Combining Cylindrical Source Model and Capacity Resistance Model |
| title_short | A New Simulation Model for Vertical Spiral Ground Heat Exchangers Combining Cylindrical Source Model and Capacity Resistance Model |
| title_sort | new simulation model for vertical spiral ground heat exchangers combining cylindrical source model and capacity resistance model |
| topic | ground source heat pump system vertical spiral ground heat exchanger borehole thermal storage infinite cylindrical source capacity resistance model |
| url | https://www.mdpi.com/1996-1073/13/6/1339 |
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