Measurements of temperature distribution in ground

Popiel, C. O.; Wojtkowiak, Janusz; Biernacka, Beata

doi:10.1016/s0894-1777(01)00078-4

Cited by 161 publications

(65 citation statements)

References 3 publications

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“…Temperature usually varies very significantly with a height from this interface upwards in the lowest meters of the atmosphere [2], and the same happens as the progressively deeper layers in the soil are explored [3], with variations of contrary signs, with usually LST being the highest (lowest) value of the temperature profile in the daytime (nighttime). In applications, LST is usually taken as a boundary condition for atmosphere or for the soil and the surface fluxes estimated using its values are the main drivers of the physical processes involved in the surface energy and water balances ( [4][5][6][7][8]).…”

Section: Introductionmentioning

confidence: 88%

Landsat and Local Land Surface Temperatures in a Heterogeneous Terrain Compared to MODIS Values

et al. 2016

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Land Surface Temperature (LST) as provided by remote sensing onboard satellites is a key parameter for a number of applications in Earth System studies, such as numerical modelling or regional estimation of surface energy and water fluxes. In the case of Moderate Resolution Imaging Spectroradiometer (MODIS) onboard Terra or Aqua, pixels have resolutions near 1 km 2 , LST values being an average of the real subpixel variability of LST, which can be significant for heterogeneous terrain. Here, we use Landsat 7 LST decametre-scale fields to evaluate the temporal and spatial variability at the kilometre scale and compare the resulting average values to those provided by MODIS for the same observation time, for the very heterogeneous Campus of the University of the Balearic Islands (Mallorca, Western Mediterranean), with an area of about 1 km 2 , for a period between 2014 and 2016. Variations of LST between 10 and 20 K are often found at the sub-kilometre scale. In addition, MODIS values are compared to the ground truth for one point in the Campus, as obtained from a four-component net radiometer, and a bias of 3.2 K was found in addition to a Root Mean Square Error (RMSE) of 4.2 K. An indication of a more elaborated local measurement strategy in the Campus is given, using an array of radiometers distributed in the area.

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Section: Introductionmentioning

confidence: 88%

Landsat and Local Land Surface Temperatures in a Heterogeneous Terrain Compared to MODIS Values

et al. 2016

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“…The 30-50 mm pipes of these heat exchangers are buried at a depth of 1.5-2.0 m under the surface, depending on the thermal characteristics of the ground mass. The results of measurement of ground mass temperature [4] have indicated that the area up to 1 m deep is highly sensitive even to short-term variations of weather. In the summer months (July-September), the density of transferred heat flow from the ground mass surface to deeper strata amounts to 3.6 W·m .…”

Section: Open Accessmentioning

confidence: 99%

Temperatures and Heat Flows in a Soil Enclosing a Slinky Horizontal Heat Exchanger

2014

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Abstract:Temperature changes and heat flows in soils that host "slinky"-type horizontal heat exchangers are complex, but need to be understood if robust quantification of the thermal energy available to a ground-source heat pump is to be achieved. Of particular interest is the capacity of the thermal energy content of the soil to regenerate when the heat exchangers are not operating. Analysis of specific heat flows and the specific thermal energy regime within the soil, including that captured by the heat-exchangers, has been characterised by meticulous measurements. These reveal that high concentrations of antifreeze mix in the heat-transfer fluid of the heat exchanger have an adverse impact on heat flows discharged into the soil.

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“…The temperature distribution across the ground, the temperature gradients, and the heat flow densities shared between the ground surface and the surrounding environment were investigated by Popiel et al [12]. Heat energy extraction from the ground, specific heat output of a linear HGHE and a Slinky-type HGHE, and the effect of the incident solar radiation on the ground energy balance were studied in detail by Wu et al [13].…”

Section: Introductionmentioning

confidence: 99%

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

2016

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Abstract:The objective of this work was to monitor and analyse temperature changes in the ground with installed linear and Slinky-type horizontal ground heat exchangers (HGHEs), used as low-potential heat pump energy sources. Specific heat flows and specific energies extracted from the ground during the heating season were also measured and compared. The verification results showed that the average daily ground temperatures with the two HGHEs are primarily affected by the temperature of the ambient environment. The ground temperatures were higher than ambient temperature during most of the heating season, were only seldom below zero, and were higher by an average 1.97˘0.77 K in the ground with the linear HGHE than in the ground with the Slinky-type HGHE. Additionally, the specific thermal output extracted from the ground by the HGHE was higher by 8.45˘16.57 W/m 2 with the linear system than with the Slinky system. The specific energies extracted from the ground over the whole heating season were 110.15 kWh/m 2 and 57.85 kWh/m 2 for the linear and Slinky-type HGHEs, respectively.

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Measurements of temperature distribution in ground

Cited by 161 publications

References 3 publications

Landsat and Local Land Surface Temperatures in a Heterogeneous Terrain Compared to MODIS Values

Landsat and Local Land Surface Temperatures in a Heterogeneous Terrain Compared to MODIS Values

Temperatures and Heat Flows in a Soil Enclosing a Slinky Horizontal Heat Exchanger

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

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