Heat transfer in horizontal ground heat exchangers

Kupiec, Krzysztof; Larwa, Barbara; Gwadera, Monika

doi:10.1016/j.applthermaleng.2014.10.003

Cited by 49 publications

(30 citation statements)

References 13 publications

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“…During the heating period, this set was characterized by the lowest temperatures, high temperature variability, and low relative frequency in the temperature range containing the mode of its monitored temperatures. These conclusions are also confirmed by results of operational verification [22][23][24][25] and modelling [14]. It is realistic to assume that, in the climatic conditions of the Czech Republic, the more favourable characteristics of the linear HGHE temperature set have positive effect on the operation of the heat pump and reduce the consumption of fossil fuels both in the heating system and for the heat pump drive.…”

Section: Discussionsupporting

confidence: 67%

Analysis of the Potential of Low-Temperature Heat Pump Energy Sources

Neuberger

Adamovský

2017

Energies

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The paper deals with an analysis of temperatures of ground masses in the proximities of linear and slinky-type HGHE (horizontal ground heat exchanger). It evaluates and compares the potentials of HGHEs and ambient air. The reason and aim of the verification was to gain knowledge of the temperature course of the monitored low-temperature heat pump energy sources during heating periods and periods of stagnation and to analyse the knowledge in terms of the potential to use those sources for heat pumps. The study was conducted in the years 2012-2015 during three heating periods and three periods of HGHEs stagnation. The results revealed that linear HGHE had the highest temperature potential of the observed low-temperature heat pump energy sources. The average daily temperatures of the ground mass surrounding the linear HGHE were the highest ranging from 7.08 • C to 9.20 • C during the heating periods, and having the lowest temperature variation range of 12.62-15.14 K, the relative frequency of the average daily temperatures of the ground mass being the highest at 22.64% in the temperature range containing the mode of all monitored temperatures in a recorded interval of [4.10, 6.00] • C. Ambient air had lower temperature potential than the monitored HGHEs.

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Section: Discussionsupporting

confidence: 67%

Analysis of the Potential of Low-Temperature Heat Pump Energy Sources

Neuberger

Adamovský

2017

Energies

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“…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

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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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“…On the base of analysis of received courses of temperature isolines in the ground a simplified mathematical model of heat transfer in a horizontal ground exchanger has been worked out and verified with experimental measurements [9].…”

Section: Discussionmentioning

confidence: 99%

Investigation of temperature distribution in the ground induced by heat source and under natural conditions

Larwa

2017

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Investigation of temperature distribution in the ground induced by heat source and under natural conditions Badania rozkładu temperatury w gruncie wywołanego źródłem ciepła oraz w warunkach naturalnych Abstract This paper deals with theoretical and experimental analysis of heat transfer in the ground. Calculation results of heat transfer under natural conditions were presented. Temperature profiles in the ground were determined for cyclic steady state. Results of experimental studies conducted in laboratory setup were shown. Experimental studies were related to determination of temperature of the heated granular bed. The calculation and measurement results presented were used to determine a mathematical model of the ground heat exchanger. Keywords: process modelling, transient heat conduction, renewable energy sourcesStreszczenie Artykuł dotyczy analizy teoretyczno-doświadczalnej przenoszenia ciepła w gruncie. Przedstawiono wyniki obliczeń przenoszenia ciepła w warunkach naturalnych. Wyznaczono profile temperatur w gruncie w zależ-ności od czasu dla cyklicznego stanu ustalonego. W części eksperymentalnej przedstawiono wyniki badań prowadzonych w instalacji laboratoryjnej. Badania dotyczyły wyznaczenia temperatur w ogrzewanym złożu ziarnistym. Przedstawione wyniki badań i obliczeń zostały wykorzystane do opracowania modelu matematycznego gruntowego wymiennika ciepła.Słowa kluczowe: modelowanie procesów, nieustalone przewodzenie ciepła, odnawialne źródła energii

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Heat transfer in horizontal ground heat exchangers

Cited by 49 publications

References 13 publications

Analysis of the Potential of Low-Temperature Heat Pump Energy Sources

Analysis of the Potential of Low-Temperature Heat Pump Energy Sources

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

Investigation of temperature distribution in the ground induced by heat source and under natural conditions

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