Research on multi-objective optimization of control strategies and equipment parameters for a combined heating system of geothermal and solar energy in cold and arid regions based on TRNSYS

Sun, Chang; Ju, Xiaolei; Hao, Wengang; Lu, Yongfei

doi:10.1016/j.csite.2023.103441

Cited by 14 publications

(2 citation statements)

References 28 publications

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“…Throughout the study period, the thermodynamic energy and exergy of the cooling systems, utilizing both refrigerants, underwent comprehensive evaluation via simulation at the specified study sites. Sun et al [19] employed TRNSYS to model the integration of geothermal and solar energy for heating a typical building in an arid and cooled region of China. The implemented system included a single GSHP with a heating capacity of 355 kW and a 125 m deep VBGHE with soil thermal conductivity and capacity values of 2.33 W•m −1 •K −1 and 2016 kJ•m −3 •K −1 , respectively, along with a 66 m 2 vacuum-tube solar collector.…”

Section: Introductionmentioning

confidence: 99%

Geothermal Heat Pump for Space Cooling and Heating in Kuwaiti Climate

Gharbia,

Derakhshandeh,

Amer

et al. 2024

Processes

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Kuwait stands as one of the hottest locations globally, experiencing scorching temperatures that can soar to 50 °C during the summer months. Conversely, in the winter months of December and January, temperatures may plummet to less than 10 °C. Maintaining a comfortable temperature indoors necessitates a substantial amount of energy, particularly during the scorching summer seasons. In Kuwait, most of the electrical energy required for functions such as air conditioning and lighting is derived from fossil fuel resources, contributing to escalating air pollution and global warming. To reduce dependence on conventional energy sources for heating and cooling, this article presents a case study to explore the potential of using geothermal energy for space heating and cooling in Kuwait. The case study involves utilizing a geothermal heat pump (water-sourced heat pump) in conjunction with a vertical-borehole ground heat exchanger (VBGHE). The mentioned system is deployed to regulate the climate in a six-floor apartment block comprising a small two-bedroom apartment on each level, each with a total floor area of 57 m2. Two geothermal heat pumps, each with a cooling capacity of 2.58 kW and a heating capacity of 2.90 kW, connected to two vertical-borehole heat exchangers, were deployed for each apartment to maintain temperatures at 22 °C in summer and 26 °C in winter. The findings indicate that the estimated annual energy loads for cooling and heating for the apartment block are 42,758 kWh and 113 kWh, respectively. The corresponding electrical energy consumption amounted to 9294 kWh for space cooling and 113 kWh for space heating. The observed peak cooling load was approximately 9300 kJ/h (2.58 kW) per apartment, resulting in a power density of 45 W/m2. Moreover, the HP system achieved a 22% reduction in annual electric energy consumption compared to conventional air conditioning systems. This reduction in electric energy usage led to an annual CO2 reduction of 6.6 kg/m2.

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Section: Introductionmentioning

confidence: 99%

Geothermal Heat Pump for Space Cooling and Heating in Kuwaiti Climate

Gharbia,

Derakhshandeh,

Amer

et al. 2024

Processes

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“…The research results showed that the optimised control strategy of the geothermal-solar heating system transfers solar hot water from the storage tank to heating terminals during the heating season. Compared to GSHP, this optimisation strategy saves 16.8 MWh annually, and the energy-saving rate is 20.59% [25].…”

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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