Changes in energy and temperature in the ground mass with horizontal heat exchangers—The energy source for heat pumps

Adamovský, D.; Neuberger, Pavel; Adamovský, R.

doi:10.1016/j.enbuild.2015.01.052

Cited by 38 publications

(10 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Assuming a constant condensation temperature, a higher heating factor can be attained via a higher evaporation temperature. The results of practical testing [5][6][7], as well as modelling [8], have shown that the ground temperatures are higher than the ambient temperatures during the major part of the heating season, whereas the reverse is true during the summer season. Hence, the ground is a convenient, stable, low-potential heat pump source for building heating in winter and for their cooling in summer.…”

Section: Introductionmentioning

confidence: 99%

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

2016

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

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

2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…The performance of horizontal heat exchangers for GSHPs has also been studied using experimental measurements and mathematical models, though not as extensive as for the more widely used borehole heat exchangers. A horizontal heat exchanger for a GSHP can be formed with parallel straight pipes or slinky coils and by comparison only a limited number of field tests have been carried out for horizontal straight pipes [12][13], slinky coils [14][15] and both types [16].…”

Section: Introductionmentioning

confidence: 99%

Dynamic thermal performance of horizontal ground source heat pumps – The impact of coupled heat and moisture transfer

Gan

2018

Energy

View full text Add to dashboard Cite

A ground heat exchanger is a key component of a ground source heat pump system, and heat and moisture transfer occurs simultaneously in soil with a horizontal ground heat exchanger in operation. A new method has been developed to generate moisture and temperature profiles in soil with spatially and temporally varying properties. The profiles are used as initial data for accurate solution of the equations for transient heat and moisture transfer in soil containing a buried horizontal ground heat exchanger. The impacts of initial conditions of soil and coupled heat and moisture transfer are assessed on the thermal performance of a horizontal ground heat exchanger for a ground source heat pump for different installation depths and soil textures. Seasonal heat transfer through a horizontal heat exchanger increases with installation depth and a heat exchanger installed at 2 m deep can transfer 19% more heat than that at 1 m deep. Heat transfer in sandy soil is 17% higher than in loamy sand soil which is 14.5% higher than in clay loam soil. The maximum differences between models with and without moisture transfer for the prediction of heat transfer through a heat exchanger are 24%, 17% and 18% in clay sand, loamy sand and sandy soils, respectively. In conclusion, it is necessary to use a coupled heat and moisture transfer model in order to predict accurately the seasonal thermal performance of a ground heat exchanger in shallow ground.

show abstract

“…Depending on the relation between net heat transferred in the exchanger and net heat transferred through the ground surface, the ground average temperature changes. The differences in ground temperatures (with heat exchanger installed) before heating seasons in successive years were determined by Adamovsky et al [3]. In the extreme case temperature decreased of 1.54 K.…”

Section: Introductionmentioning

confidence: 99%

Heat Balance of Horizontal Ground Heat Exchangers

Kupiec

Gwadera

2018

Ecological Chemistry and Engineering S

View full text Add to dashboard Cite

This work refers to the modelling of heat transfer in horizontal ground heat exchangers. For different conditions of collecting heat from the ground and different boundary condition profiles of temperature in the ground were found, and temporal variations of heat flux transferred between the ground surface and its interior were determined. It was taken into account that this flux results from several different mechanisms of heat transfer: convective, radiative, and that connected with moisture evaporation. It was calculated that ground temperature at great depths is greater than the average annual ambient temperature.

show abstract

Changes in energy and temperature in the ground mass with horizontal heat exchangers—The energy source for heat pumps

Cited by 38 publications

References 17 publications

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

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

Dynamic thermal performance of horizontal ground source heat pumps – The impact of coupled heat and moisture transfer

Heat Balance of Horizontal Ground Heat Exchangers

Contact Info

Product

Resources

About