An experimental work on the performance of a solar-assisted ground-coupled heat pump using a horizontal ground heat exchanger

Bulmez, Alexandru; Ciofoaia, V.; Năstase, Gabriel; Dragomir, George; Brezeanu, Alin-Ionuț; Şerban, Alexandru

doi:10.1016/j.renene.2021.11.064

Cited by 23 publications

(7 citation statements)

References 33 publications

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“…The system is equipped with two sets of oil-water heat exchangers, one for supplying domestic hot water and the other for winter heating [17] .…”

Section: Ground Source Heat Pump Solar Energy Heat Utilization Systemmentioning

confidence: 99%

The combined application technology of solar heat utilization and ground source heat pump

Luo,

Liu,

Duan

2024

J. Phys.: Conf. Ser.

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Energy issues play an increasingly important role in national security and economic development. The country has put forward the policy of building energy-saving and land-saving buildings. The application of the comprehensive utilization of renewable energy in the construction field has gradually become a need for technical progress and industry development. With the official promulgation and implementation of the Renewable Energy Law in 2006, the application of solar energy, geothermal energy, and other related renewable energy in the construction industry has attracted more and more attention. However, the scope of practical application is currently limited to solar energy alone to supply domestic hot water, power generation, or ground source heat pump system heating and cooling. The actual engineering cases of the combined operation of the two are relatively few, and the unreasonable joint operation mode leads to low system efficiency. In this paper, the combined application system of solar heat utilization and ground source heat pump is elaborated and analyzed in detail, from the technical feasibility, system efficiency, and other aspects of the analysis. It emphasizes the necessity and development prospect of the comprehensive utilization of renewable energy.

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“…The system is equipped with two sets of oil-water heat exchangers, one for supplying domestic hot water and the other for winter heating [17] .…”

Section: Ground Source Heat Pump Solar Energy Heat Utilization Systemmentioning

confidence: 99%

The combined application technology of solar heat utilization and ground source heat pump

Luo,

Liu,

Duan

2024

J. Phys.: Conf. Ser.

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“…This study also aims to present the complex interplay between Trombe wall technology and ventilation dynamics, ultimately contributing to the advancement of sustainable building practices and the evolution of passive solar-design strategies [15], or solar-assistancedesign strategies [16,17].…”

Section: Introductionmentioning

confidence: 99%

CFD Analysis for a New Trombe Wall Concept

Bulmez,

Brezeanu,

Dragomir

et al. 2024

Buildings

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The envelope (façade) of a building is the first barrier between the exterior and the interior of the building and withstands the highest variation in temperature and solar radiation. Trombe walls are used to take advantage of that and contribute to the heating of interior air, helping the heating system. In this study, a new Trombe wall design is presented to contribute significantly to the indoor ventilation of residential buildings. For this, an exterior wall equipped with a proposed Trombe system was studied in a numerical simulation analysis. The proposed systems consist of two important sections, an exterior one and an interior one. The air cavities on the exterior of the wall, covered with silica glass, are the first heat-transfer layer. The secondary layer used for heat transfer, on the interior, is comprised of a MPCLB wall of 115 mm. The air circulation from the exterior to the interior was established as forced convection with a ventilator. The air circulates through the first heating layer on the exterior air cavities and then passes through the second heating layer on the interior MPCLBs. Two cities in Romania were considered to represent the coldest and hottest climates in Romania. Brașov represents the cold climate and Constanța represents the hot climate. In the investigation, both the presence and absence of solar radiation were taken into account. In total, four cases were established. For all four cases, monthly research was made using monthly mean temperatures, and direct and diffuse solar radiation. The results are promising and illustrate that the system works best during the transitional seasons of spring and autumn. The lower the outdoor temperature, the higher the temperature can be increased. Overall, solar radiation accounted for an average 2 °C increase. The temperature increase varied between 3.4 °C and 15.99 °C for Brașov and between 6.42 °C and 12.07 °C in Constanța. This study presents an alternative way to use the Trombe wall for indoor ventilation purposes throughout the year, compared to traditional uses for the Trombe wall for indoor heating.

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“…Horizontal ground heat exchangers are cheaper, but the downside is that they are not as efficient. It has been found that the efficiency of horizontal ground heat exchangers can be improved by adding auxiliary heat sources to shorten the ground freezing period [29].…”

Section: Introductionmentioning

confidence: 99%

Research on the Optimisation of Dual-Heat-Source Heating Systems in Nearly Zero-Energy Buildings

Hou,

Xu,

Zhang

et al. 2024

Sustainability

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A nearly zero-energy building is characterised by its low energy demand and enhanced thermal insulation, with great potential to integrate renewable energy systems to satisfy various demands and improve energy efficiency. Solar energy is a primary renewable energy resource that can be harnessed in different ways to provide electricity, heating, and cooling in building applications. In this study, a solar–ground-source heat pump system was designed and established in a nearly zero-energy building. The system’s performance was presented, and its control strategy was optimised. To evaluate and assess the operation of the solar energy system, an experimental setup was built, and the experiment was divided into two periods, taking into account the weather conditions. In the first experimental period, different parameters of the heating system were tested and evaluated. In this regard, the variation trends of the heat pump unit’s coefficient of performance, the system coefficient of performance, the collector start-up temperature difference, and the heat pump setting temperature were analysed under different parameter combinations. On this basis, the optimal operating parameters were identified for different heating periods. In the second period, the optimal operating parameters identified were used to carry out heating experiments. The results highlighted that the adoption of the preferred operating parameters increases the percentage of direct solar energy supply by 2.0%. Additionally, the system coefficient of performance increases by 8.9%, the unit coefficient of performance increases by 6.7%, the carbon emissions are reduced by 4.18 tonnes, the SO2 emissions are reduced by 0.143 tonnes, and the dust emissions are reduced by 0.1 tonnes. The findings of this study can provide useful data and a guiding reference for optimising and promoting the implementation of renewable-energy-driven heating systems for nearly zero-energy buildings in severe cold regions.

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An experimental work on the performance of a solar-assisted ground-coupled heat pump using a horizontal ground heat exchanger

Cited by 23 publications

References 33 publications

The combined application technology of solar heat utilization and ground source heat pump

The combined application technology of solar heat utilization and ground source heat pump

CFD Analysis for a New Trombe Wall Concept

Research on the Optimisation of Dual-Heat-Source Heating Systems in Nearly Zero-Energy Buildings

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