Monitoring and Analysing Changes in Temperature and Energy in the Ground with Installed Horizontal Ground Heat Exchangers

Pauli, Pavel; Neuberger, Pavel; Adamovský, R.

doi:10.3390/en9080555

Cited by 11 publications

(6 citation statements)

References 20 publications

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“…This figure shows the minimum ground temperature of approx. −2.5 • C. What is more, the obtained courses confirm the observations presented in the work by Pauli et al [6] concerning the ground temperature at the level of the exchanger installation-despite the heat consumption, this temperature is generally not lower than the ground surface temperature; moreover, its value does not fall significantly below 0 • C.…”

Section: Quantitysupporting

confidence: 89%

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Modeling the Temperature Field in the Ground with an Installed Slinky-Coil Heat Exchanger

Gwadera

Kupiec

2021

Energies

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In order to find the temperature field in the ground with a heat exchanger, it is necessary to determine temperature responses of the ground caused by heat sources and the influence of the environment. To determine the latter, a new model of heat transfer in the ground under natural conditions was developed. The heat flux of the evaporation of moisture from the ground was described by the relationship taking into account the annual amount of rainfall. The analytical solution for the equations of this model is presented. Under the conditions for which the calculations were performed, the following data were obtained: the average ground surface temperature Tsm = 10.67 °C, the ground surface temperature amplitude As = 13.88 K, and the phase angle Ps = 0.202 rad. This method makes it possible to easily determine the undisturbed ground temperature at any depth and at any time. This solution was used to find the temperature field in the ground with an installed slinky-coil heat exchanger that consisted of 63 coils. The results of calculations according to the presented model were compared with the results of measurements from the literature. The 3D model for the ground with an installed heat exchanger enables the analysis of the influence of miscellaneous parameters of the process of extracting or supplying heat from/to the ground on its temperature field.

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Section: Quantitysupporting

confidence: 89%

“…Pauli et al [6] monitored the ground temperature with installed horizontal ground heat exchangers of various configurations. The research concerned the collection of heat from the ground.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Temperature Field in the Ground with an Installed Slinky-Coil Heat Exchanger

Gwadera

Kupiec

2021

Energies

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“…However, if HGHE is installed, the average temperature of the subsurface layer of the ground mass may change because the extracted heat is not generally compensated for by the amount of heat delivered during the summer. Nevertheless, the results of our HGHE verifications [24,25] proved that regeneration of the energy potential of the ground mass occurred during the stagnation of the HGHE's operation if the heat exchanger configurations were well designed, taking into account the thermal characteristics of the ground mass. Bottareli et al [26] analyzed the heat output and temperature of HGHE heat transfer fluids in connection with the underground heat energy storage.…”

Section: Introductionmentioning

confidence: 86%

Analysis and Comparison of Some Low-Temperature Heat Sources for Heat Pumps

Neuberger

Adamovský

2019

Energies

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The efficiency of a heat pump energy system is significantly influenced by its low-temperature heat source. This paper presents the results of operational monitoring, analysis and comparison of heat transfer fluid temperatures, outputs and extracted energies at the most widely used low temperature heat sources within 218 days of a heating period. The monitoring involved horizontal ground heat exchangers (HGHEs) of linear and Slinky type, vertical ground heat exchangers (VGHEs) with single and double U-tube exchanger as well as the ambient air. The results of the verification indicated that it was not possible to specify clearly the most advantageous low-temperature heat source that meets the requirements of the efficiency of the heat pump operation. The highest average heat transfer fluid temperatures were achieved at linear HGHE (8.13 ± 4.50 °C) and double U-tube VGHE (8.13 ± 3.12 °C). The highest average specific heat output 59.97 ± 41.80 W/m2 and specific energy extracted from the ground mass 2723.40 ± 1785.58 kJ/m2·day were recorded at single U-tube VGHE. The lowest thermal resistance value of 0.07 K·m2/W, specifying the efficiency of the heat transfer process between the ground mass and the heat transfer fluid, was monitored at linear HGHE. The use of ambient air as a low-temperature heat pump source was considered to be the least advantageous in terms of its temperature parameters.

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“…Gonzalez et al (2012) discovered that vegetation growth in the spring could result in a soil temperature difference of 2°C between soil with and without vegetation growth. This was re-affirmed by Pauli, Neuberger, and Adamovsky (2016) who determined that environmental conditions such as solar radiation intensity and daytime and nighttime radiation heat exchange between the Earth's surface and the sky played an important role on shallow soil temperatures. Further additional findings by Hepburn, Sedighi, Thomas, and Manju (2016) attributed soil temperature variations to the ambient environment's relative humidity and wind speed.…”

Section: Experimental Variables To Considermentioning

confidence: 92%

Towards determining the effect of shallow depth horizontal ground loop clearance on the heat loss of a single family residential dwelling

Chen¹

2021

Preprint

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Using solar energy stored in the ground to preheat incoming fresh ventilation air with ground loops is a renewable energy system which is becoming more frequently used in new residential developments. The purpose of this research was to examine the effect of ground loop to foundation wall clearance on building heat loss. Additionally, the thermal properties of the soil were examined to determine their impact on the ground loop’s effect on heat loss. A simulation based research approach was conducted using HEAT3, which is a three-dimensional transient heat transfer software. This study found that ground loop clearance had a larger impact on building heat loss for areas with low thermal conductivity soils than for areas with high thermal conductivity soils. On average, ground loop clearances of 10cm, 50cm, 100cm, and 200cm resulted in increased building heat losses of 20%-83%, 19%-55%, 16%-35%, and 12%-15% respectively.

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Monitoring and Analysing Changes in Temperature and Energy in the Ground with Installed Horizontal Ground Heat Exchangers

Cited by 11 publications

References 20 publications

Modeling the Temperature Field in the Ground with an Installed Slinky-Coil Heat Exchanger

Modeling the Temperature Field in the Ground with an Installed Slinky-Coil Heat Exchanger

Analysis and Comparison of Some Low-Temperature Heat Sources for Heat Pumps

Towards determining the effect of shallow depth horizontal ground loop clearance on the heat loss of a single family residential dwelling

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