Energy and economic evaluation of a solar assisted ground source heat pump system for a north Mediterranean city

Sakellariou, Evangelos I.; Axaopoulos, Petros J.; Wright, Andrew

doi:10.1016/j.enbuild.2020.110640

Cited by 22 publications

(7 citation statements)

References 44 publications

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“…However, it was reported that the initial cost of the solar system was high, and the installation location of the solar system was crucial for cost optimization. 28,29…”

Section: Introductionmentioning

confidence: 99%

Mock-up experimental study on the performance of a combined cooling-domestic hot water-ground source heat pump system

Zhang

Rhee

Jung

2023

Building Services Engineering Research and Technology

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A ground source heat pump (GSHP) delivers heat from a condenser to the ground when it operates with cooling mode. However, the ground temperature increases when the GSHP system operates for a long time. The increased ground temperature can deteriorate the GSHP’s coefficient of performance (COP). To maintain the balance between the ground temperature and COP, the condensation heat from the cooling GSHP can be used for other heating systems before it is transferred to the ground. This study proposes a combined GSHP system connecting a three RT cooling GSHP with a 1.5 RT domestic hot water (DHW) heat pump, and the performance of the system was evaluated through mock-up experiments. In the combined GSHP system, the condensation heat of the cooling system was used as the heat source of the DHW system. Therefore, the ground temperature could be reduced, and the performances of both the GSHP cooler and DHW heater pump could be enhanced. Mock-up experiments for performance evaluation were conducted with cooling-only, DHW-only, and cooling-DHW operational modes. The results showed that cooling-DHW operation slowed down the change in heat source temperature. In comparison with those of the cooling-only and DWH-only heat pumps, the COPs of the cooling heat pump and DHW heat pump of the combined system were increased by 12.93% and 15.47%, respectively. Moreover, the total COP of the cooling-DHW combined GSHP system increased by 4.4% and 29.55% in comparison with those of the cooling-only GSHP and DHW-only GSHP systems, respectively. Practical application A combined GSHP system was proposed by connecting a GSHP for space cooling with a heat pump for DHW to mitigate the ground temperature changes due to the long-term operation of the GSHP system. The combined system reuses the condensation heat generated by the cooling heat pump as the heat source of the DHW heat pump for ensuring the system performance and building energy saving. Therefore, this system is suitable for buildings with large energy use and heavy hot water demand, especially in summer, such as hospital and hotel buildings.

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“…However, it was reported that the initial cost of the solar system was high, and the installation location of the solar system was crucial for cost optimization. 28,29…”

Section: Introductionmentioning

confidence: 99%

Mock-up experimental study on the performance of a combined cooling-domestic hot water-ground source heat pump system

Zhang

Rhee

Jung

2023

Building Services Engineering Research and Technology

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“…Iorio et al [33] developed a numerical model to describe the perturbation induced on the ground by GWHPs serving public schools in Southern Italy. Sakellariou et al [34] performed energetic and economic analyses of a solar-assisted GSHP serving the heating and hot water demands of a dwelling in Greece. The results showed the design and economic conditions in terms of the number of solar collectors and the financial support mechanism required to achieve economic viability compared to a conventional natural gas-fuelled boiler.…”

Section: Introductionmentioning

confidence: 99%

Energy-saving potential of ground source multiple chillers in simple and hybrid configurations for Mediterranean climates

Buscemi

Catrini

Piacentino

et al. 2022

Energy Conversion and Management

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“…A study on the energy efficiency and cost-effectiveness of a SAGSHP system based on PVT panels is shown by Sakellariou et al in [4] for the city of Thessaloniki (Greece). It was found that the SAGSHP system achieved the highest efficiency with 16 PVT panels, which can cover 73% of the heating load and generate 1.22 times more electricity than it consumes.…”

Section: Introductionmentioning

confidence: 99%

A New Solar Assisted Heat Pump System with Underground Energy Storage: Modelling and Optimisation

Ocłoń

Ławryńczuk

Czamara³

2021

Energies

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The objectives of this work are: (a) to present a new system for building heating which is based on underground energy storage, (b) to develop a mathematical model of the system, and (c) to optimise the energy performance of the system. The system includes Photovoltaic Thermal Hybrid Solar Panels (PVT) panels with cooling, an evacuated solar collector and a water-to-water heat pump. Additionally, storage tanks, placed underground, are used to store the waste heat from PVT panels cooling. The thermal energy produced by the solar collectors is used for both domestic hot water preparation and thermal energy storage. Both PVT panels and solar collectors are assembled with a sun-tracking system to achieve the highest possible solar energy gain. Optimisation of the proposed system is considered to achieve the highest Renewable Energy Sources (RES) share during the heating period. Because the resulting optimisation problem is nonlinear, the classical gradient-based optimisation algorithm gives solutions that are not satisfying. As alternatives, three heuristic global optimisation methods are considered: the Genetic Algorithm (GA), the Particle Swarm Optimisation (PSO) algorithm, and the Jaya algorithm. It is shown that the Jaya algorithm outperforms the GA and PSO methods. The most significant result is that 93% of thermal energy is covered by using the underground energy storage unit consisting of two tanks.

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Energy and economic evaluation of a solar assisted ground source heat pump system for a north Mediterranean city

Cited by 22 publications

References 44 publications

Mock-up experimental study on the performance of a combined cooling-domestic hot water-ground source heat pump system

Mock-up experimental study on the performance of a combined cooling-domestic hot water-ground source heat pump system

Energy-saving potential of ground source multiple chillers in simple and hybrid configurations for Mediterranean climates

A New Solar Assisted Heat Pump System with Underground Energy Storage: Modelling and Optimisation

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