Different strategies for long term performance of SAGSHP to match residential energy requirements in a cold climate

Francesco Reda (Corresponding Author), Ari Laitinen

Research output: Contribution to journalArticleScientificpeer-review

23 Citations (Scopus)

Abstract

Awareness about serious environmental problems due to fossil fuel consumption is increasing widely. Furthermore ground source heat pumps (GSHP) have increasingly been used for residential building heating and cooling in recent years and one promising configuration for cold climate is the solar assisted ground source heat pump (SAGSHP), where solar energy could be used for supplying heating energy to the building or for recharging the boreholes. Scientists pointed out that a key role is played by the strategy to control the solar-ground loop (Zhai et al.; Rad et al.; Kjellsson et al. ; Stojanovic and Akander). The presented paper focuses on a new control strategy for such systems aiming to maximize the solar energy use and energy savings. In order to compare different proposed and current operating modes and strategies of SAGSHP systems, simulations have been carried out with the simulation program TRNSYS. Results have shown that the proposed strategy is effective from a specific borehole depth; furthermore the temperature difference between solar collectors and ground source, which has to be exceeded for driving solar energy into the ground, has to be chosen prudently as a function of the borehole depth, the solar filed size and the auxiliary system typology.
Original languageEnglish
Pages (from-to)557-572
JournalEnergy and Buildings
Volume86
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

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Geothermal heat pumps
Boreholes
Solar energy
Heating
Heat pump systems
Solar collectors
Fossil fuels
Fuel consumption
Energy conservation
Cooling
Temperature

Keywords

  • solar assisted ground source heat pump
  • residential building
  • energy savings
  • cold climate

Cite this

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title = "Different strategies for long term performance of SAGSHP to match residential energy requirements in a cold climate",
abstract = "Awareness about serious environmental problems due to fossil fuel consumption is increasing widely. Furthermore ground source heat pumps (GSHP) have increasingly been used for residential building heating and cooling in recent years and one promising configuration for cold climate is the solar assisted ground source heat pump (SAGSHP), where solar energy could be used for supplying heating energy to the building or for recharging the boreholes. Scientists pointed out that a key role is played by the strategy to control the solar-ground loop (Zhai et al.; Rad et al.; Kjellsson et al. ; Stojanovic and Akander). The presented paper focuses on a new control strategy for such systems aiming to maximize the solar energy use and energy savings. In order to compare different proposed and current operating modes and strategies of SAGSHP systems, simulations have been carried out with the simulation program TRNSYS. Results have shown that the proposed strategy is effective from a specific borehole depth; furthermore the temperature difference between solar collectors and ground source, which has to be exceeded for driving solar energy into the ground, has to be chosen prudently as a function of the borehole depth, the solar filed size and the auxiliary system typology.",
keywords = "solar assisted ground source heat pump, residential building, energy savings, cold climate",
author = "Francesco Reda and Ari Laitinen",
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T1 - Different strategies for long term performance of SAGSHP to match residential energy requirements in a cold climate

AU - Reda, Francesco

AU - Laitinen, Ari

PY - 2015

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N2 - Awareness about serious environmental problems due to fossil fuel consumption is increasing widely. Furthermore ground source heat pumps (GSHP) have increasingly been used for residential building heating and cooling in recent years and one promising configuration for cold climate is the solar assisted ground source heat pump (SAGSHP), where solar energy could be used for supplying heating energy to the building or for recharging the boreholes. Scientists pointed out that a key role is played by the strategy to control the solar-ground loop (Zhai et al.; Rad et al.; Kjellsson et al. ; Stojanovic and Akander). The presented paper focuses on a new control strategy for such systems aiming to maximize the solar energy use and energy savings. In order to compare different proposed and current operating modes and strategies of SAGSHP systems, simulations have been carried out with the simulation program TRNSYS. Results have shown that the proposed strategy is effective from a specific borehole depth; furthermore the temperature difference between solar collectors and ground source, which has to be exceeded for driving solar energy into the ground, has to be chosen prudently as a function of the borehole depth, the solar filed size and the auxiliary system typology.

AB - Awareness about serious environmental problems due to fossil fuel consumption is increasing widely. Furthermore ground source heat pumps (GSHP) have increasingly been used for residential building heating and cooling in recent years and one promising configuration for cold climate is the solar assisted ground source heat pump (SAGSHP), where solar energy could be used for supplying heating energy to the building or for recharging the boreholes. Scientists pointed out that a key role is played by the strategy to control the solar-ground loop (Zhai et al.; Rad et al.; Kjellsson et al. ; Stojanovic and Akander). The presented paper focuses on a new control strategy for such systems aiming to maximize the solar energy use and energy savings. In order to compare different proposed and current operating modes and strategies of SAGSHP systems, simulations have been carried out with the simulation program TRNSYS. Results have shown that the proposed strategy is effective from a specific borehole depth; furthermore the temperature difference between solar collectors and ground source, which has to be exceeded for driving solar energy into the ground, has to be chosen prudently as a function of the borehole depth, the solar filed size and the auxiliary system typology.

KW - solar assisted ground source heat pump

KW - residential building

KW - energy savings

KW - cold climate

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