Experimental Study on Charging and Discharging Performance of a DualPurpose Underground Thermal Battery

Lingshi Wang; Xiaobing Liu; Ming Qu; Liang Shi; Xinzhang Zhou

doi:10.46855/energy-proceedings-9302

Experimental Study on Charging and Discharging Performance of a DualPurpose Underground Thermal Battery

Lingshi Wang, Xiaobing Liu, Ming Qu, Liang Shi, Xinzhang Zhou

Research output: Contribution to journal › Conference article › peer-review

Abstract

A dual-purpose underground thermal battery (DPUTB) was proposed for Grid-interactive Efficient Buildings. It integrates underground thermal energy storage with a shallow-buried ground heat exchanger (less than 6 m deep). The charging and discharging performance of a lab-scale DPUTB were experimentally investigated. The test results show that the lab-scale (1:125 in volume) DPUTB can provide 34 W cooling continuously for 3.7 h with a supply water temperature below 14°C. The water temperature rise of the inner tank was slowed down during the discharging process due to the phase change of the phase change material (PCM). Thermal storage capacity was increased by 156% using the PCM that only occupied 19% volume of the inner tank. The heat lost from the inner tank was recovered in the outer tank and led to the efficiency improvement of a ground source heat pump.

Original language	English
Journal	Energy Proceedings
Volume	20
DOIs	https://doi.org/10.46855/energy-proceedings-9302
State	Published - 2021
Event	13th International Conference on Applied Energy, ICAE 2021 - Bangkok, Thailand Duration: Nov 29 2021 → Dec 2 2021

Keywords

Ground heat exchanger
demand response
phase-change material
thermal storage
underground thermal battery

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10.46855/energy-proceedings-9302

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title = "Experimental Study on Charging and Discharging Performance of a DualPurpose Underground Thermal Battery",

abstract = "A dual-purpose underground thermal battery (DPUTB) was proposed for Grid-interactive Efficient Buildings. It integrates underground thermal energy storage with a shallow-buried ground heat exchanger (less than 6 m deep). The charging and discharging performance of a lab-scale DPUTB were experimentally investigated. The test results show that the lab-scale (1:125 in volume) DPUTB can provide 34 W cooling continuously for 3.7 h with a supply water temperature below 14°C. The water temperature rise of the inner tank was slowed down during the discharging process due to the phase change of the phase change material (PCM). Thermal storage capacity was increased by 156% using the PCM that only occupied 19% volume of the inner tank. The heat lost from the inner tank was recovered in the outer tank and led to the efficiency improvement of a ground source heat pump.",

keywords = "Ground heat exchanger, demand response, phase-change material, thermal storage, underground thermal battery",

author = "Lingshi Wang and Xiaobing Liu and Ming Qu and Liang Shi and Xinzhang Zhou",

note = "Publisher Copyright: {\textcopyright} 2021 ICAE.; 13th International Conference on Applied Energy, ICAE 2021 ; Conference date: 29-11-2021 Through 02-12-2021",

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doi = "10.46855/energy-proceedings-9302",

language = "English",

volume = "20",

journal = "Energy Proceedings",

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T1 - Experimental Study on Charging and Discharging Performance of a DualPurpose Underground Thermal Battery

AU - Wang, Lingshi

AU - Liu, Xiaobing

AU - Qu, Ming

AU - Shi, Liang

AU - Zhou, Xinzhang

PY - 2021

Y1 - 2021

N2 - A dual-purpose underground thermal battery (DPUTB) was proposed for Grid-interactive Efficient Buildings. It integrates underground thermal energy storage with a shallow-buried ground heat exchanger (less than 6 m deep). The charging and discharging performance of a lab-scale DPUTB were experimentally investigated. The test results show that the lab-scale (1:125 in volume) DPUTB can provide 34 W cooling continuously for 3.7 h with a supply water temperature below 14°C. The water temperature rise of the inner tank was slowed down during the discharging process due to the phase change of the phase change material (PCM). Thermal storage capacity was increased by 156% using the PCM that only occupied 19% volume of the inner tank. The heat lost from the inner tank was recovered in the outer tank and led to the efficiency improvement of a ground source heat pump.

AB - A dual-purpose underground thermal battery (DPUTB) was proposed for Grid-interactive Efficient Buildings. It integrates underground thermal energy storage with a shallow-buried ground heat exchanger (less than 6 m deep). The charging and discharging performance of a lab-scale DPUTB were experimentally investigated. The test results show that the lab-scale (1:125 in volume) DPUTB can provide 34 W cooling continuously for 3.7 h with a supply water temperature below 14°C. The water temperature rise of the inner tank was slowed down during the discharging process due to the phase change of the phase change material (PCM). Thermal storage capacity was increased by 156% using the PCM that only occupied 19% volume of the inner tank. The heat lost from the inner tank was recovered in the outer tank and led to the efficiency improvement of a ground source heat pump.

KW - Ground heat exchanger

KW - demand response

KW - phase-change material

KW - thermal storage

KW - underground thermal battery

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DO - 10.46855/energy-proceedings-9302

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JO - Energy Proceedings

JF - Energy Proceedings

T2 - 13th International Conference on Applied Energy, ICAE 2021

Y2 - 29 November 2021 through 2 December 2021

ER -

Experimental Study on Charging and Discharging Performance of a DualPurpose Underground Thermal Battery

Abstract

Keywords

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