Modeling the groundwater temperature response to extensive operation of ground source heat pump systems: A case study in Germany

Meng, Boyan; Vienken, Thomas; Kolditz, Olaf; Shao, Haibing

doi:10.1016/j.egypro.2018.09.102

Cited by 10 publications

(4 citation statements)

References 15 publications

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“…In Germany, pigs are typically housed in insulated buildings with forced ventilation. To maintain thermal welfare, just-born piglets require 35-37 • C, 28-32 • C in the first week postpartum (pp) and [25][26][27] • C in the later rearing phase [5,6]. The optimal surface temperature in the lying area should be 38-39 • C in the first week pp; for older piglets, the floor temperature in the lying area should be kept at 33-36 • C [7].…”

Section: Introductionmentioning

confidence: 99%

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Energy Efficiency of a Heat Pump System: Case Study in Two Pig Houses

Licharz

Rösmann²,

Krommweh

et al. 2020

Energies

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This study describes a 70-day investigation of three identical groundwater heat pumps (GWHP) for heating two pig houses located on the same farm in West Germany. Two of the three GWHPs were installed in a piglet-rearing barn, the third in a farrowing barn. All three heat pumps were fed from the same extraction well. The aim of this study was firstly the empirical performance measurement of the GWHP systems and secondly the energetic evaluation of the systems on barn level by calculating the coefficient of performance (COP). Three different assessment limits were considered in order to better identify factors influencing the COP. In total, the heat pumps supplied thermal energy of 47,160 kWh (piglet-rearing barn) and 36,500 kWh (farrowing barn). Depending on the assessment limit considered, the COP in piglet-rearing barn and farrowing barn ranged between 2.6–3.4 and 2.5–3.0, respectively. A significant factor influencing the COP is the amount of electrical current required to operate the groundwater feeding pump. The average groundwater flow rate was 168.4 m3 d−1 (piglet-rearing barn) and 99.1 m3 d−1 (farrowing barn). In conclusion, by using energy from groundwater, GWHPs have the potential to substitute fossil fuels, thus saving them and avoiding CO2 emissions.

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Section: Introductionmentioning

confidence: 99%

“…In Germany, but also in other European countries and worldwide, heat pumps of various designs are frequently used in residential buildings, office buildings, and in industry [22][23][24][25]. In agriculture, heat pumps are used, for example, to dry medicinal plants [26] or to heat greenhouses [27,28].…”

Section: Introductionmentioning

confidence: 99%

Energy Efficiency of a Heat Pump System: Case Study in Two Pig Houses

Licharz

Rösmann²,

Krommweh

et al. 2020

Energies

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“…This detrimental process could be intensified by the increased "effective thermal conductivity" in the host rock, caused by the surrounding fracture networks, and lead to thermal plumes in the site. However, for mine-water thermal schemes in Carboniferous formations, the thermal plume development on a "site scale" outside the fractured-rock volume should be considerably smaller than the behaviour evidenced in shallow unconsolidated aquiferswhere most thermal advection studies have been conducted (e.g., Fan et al, 2007;Meng et al, 2018)-given the much higher hydraulic conductivity of these sediments compared to highly compacted Carboniferous rocks. To prevent this negative outcome, strategies such as optimizing the well location according to the groundwater flow or placing the well screen so it induces thermal stratification, should be evaluated to increase the heat recovery (Jiang et al, 2019).…”

Section: Potential Effect Of Advective Heat Transportmentioning

confidence: 99%

The Value of a Hole in Coal: Assessment of Seasonal Thermal Energy Storage and Recovery in Flooded Coal Mines

Silva

McDermott

Fraser-Harris

2022

Earth Sci. Syst. Soc.

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Seasonal storage and extraction of heat in legacy coal mines could help decarbonize the space heating sector of many localities. The modelled evolution of a conceptual mine-water thermal scheme is analysed in this study, involving cyclical storage of heat in an enclosed underground coal mine. Conductive heat transport simulations are performed in a 3D model of a flooded room-and-pillar panel, based on typical mine layouts, to quantify the maximum thermal recovery from the host rock in different scenarios. We show that, by optimizing the seasonal management, from 25% to 45% of the energy transferred to the subsurface could be potentially recovered at the end of the first operational year. The modelled heat retrieval, achieved by subsurface cold-water circulation, does not consider the potentially enhancing effect of local advection around mine voids and applies to cases of relatively low dispersal of heat by the regional groundwater flow. The cumulative heat recovered from the modelled host rock could equal the thermal energy provided by the “mined” coal in less than 70 years. A comparison of the value of the original coal “mined,” at today’s prices, to a representative value for the heat recycled in the space created by its extraction, suggests that within less than 3 decades of thermal cycling similar monetary values are reached for the specific conditions modelled.

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“…Then, the time series of flow rate, operation temperature, and energy transfer were modelled via spectral analysis and sinusoidal regression methods, and a definition of the relative exploitation patterns was developed [27]. Meng et al [28] considered a low-carbon technology to provide heating and cooling for buildings in an urban environment and focused on the short-and long-term evolution of groundwater temperature induced by high-density ground source heat pump (GSHP) installations in an urban residential area in Cologne, Germany. Muela-Maya et al [29] proposed a procedure that allowed efficient numerical simulations to be performed at an urban scale.…”

Section: Introductionmentioning

confidence: 99%

A Study on Improving the Coefficient of Performance by Comparing Balancing Well and Standing Column Well Heat Exchange Systems

Lim

Lee

2020

Sustainability

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This study proposed a technology to improve the performance characteristics and coefficient of performance (COP) of a geothermal system by fundamentally preventing underground water discharge and maintaining a constant temperature of the underground heat exchanger composed of bleed discharge water that utilizes two balancing wells using cross-mixing methods. Using the standing column well (SCW) and cross-mixing balancing well underground heat exchanger, we compared and analyzed the effective thermal conductivity characteristics and COP characteristics during heating and cooling modes. Consequently, the cross-mixing balancing well underground heat exchanger exhibited more effective thermal conductivity than the SCW underground heat exchanger, with a high COP. Therefore, suggesting the performance was improved using groundwater flow rather than SCW. The comparison and analysis results of the effective heat map characteristics using the results of the SCW and balancing well system showed that the heating operation for the SCW underground heat exchanger had better thermal conductivity characteristics than the cooling operation. In addition, regarding a balancing well underground heat exchanger, the cooling operation exhibited superior thermal conductivity characteristics. Thus, the performance was considered to have improved due to the flow of activated groundwater in the ground and the rapid heat transfer without heat accumulation.

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Modeling the groundwater temperature response to extensive operation of ground source heat pump systems: A case study in Germany

Cited by 10 publications

References 15 publications

Energy Efficiency of a Heat Pump System: Case Study in Two Pig Houses

Energy Efficiency of a Heat Pump System: Case Study in Two Pig Houses

The Value of a Hole in Coal: Assessment of Seasonal Thermal Energy Storage and Recovery in Flooded Coal Mines

A Study on Improving the Coefficient of Performance by Comparing Balancing Well and Standing Column Well Heat Exchange Systems

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