Applicability and comparison of solar-air source heat pump systems between cold and warm regions of plateau by transient simulation and experiment

Xu, Luonan; Li, Ming; Ying, Zhang; Luo, Xianwu

doi:10.1007/s12273-020-0748-5

Cited by 10 publications

(2 citation statements)

References 23 publications

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“…The need to further improve GCHP efficiency has led to the coupling of various renewable energy sources with such GCHPs for the optimization of the thermal source temperature [7]. The solar-assisted heat pump (SAHP) is a promising solution in this context, utilizing thermal solar panels as a low-temperature heat sink, improving the overall performance of the evaporator heating cycle [15], while the use of photovoltaics to drive the HPs has also been reported as being a promising solution [16]. Nonetheless, the variable and intermittent nature of solar irradiation may still undermine the reliability and performance of SAHPs [17].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Energy Analysis of Different Heat Pump Heating Systems Exploiting Renewable Energy Sources

et al. 2023

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Renewable energy source-fed heat pumps (HPs) may perform up to very high-efficiency standards, offering a promising tool in the wider residential heat decarbonization effort. In this context, this paper investigates different heating configurations utilizing various renewable thermal sources in conjunction with an HP-based system in order to determine the optimal configuration in terms of efficiency, using an existing, fully functioning residential building in Zaragoza, Spain, as our case study, comprising 40 dwellings. Four different HP configurations are investigated:, (i) an air-source system, (ii) a ground-source system, (iii) a dual-source system with solar thermal collectors, and (iv) a triple-source system based on solar, geothermal, and ambient sources. For the purpose of such investigation, detailed dynamic energy simulations are conducted through the use of the INTEMA.building tool (developed in Modelica), applying a multi-objective optimization process that aims at minimizing both the annual electricity consumption and the net present cost. It is demonstrated that the renewable thermally driven HPs are more efficient than the conventional, air-source ones, with the seasonal coefficient of performance increasing by 9.98% (ground source), 4.57% (dual source), and 17.40% (triple source), compared to the air-source heat pump system. Finally, it is revealed (via integrated techno-economic analyses) that the most effective and economical design is the dual source system, while the most expensive is the ground-source configuration. These findings can guide the ongoing design efforts on green residential heat solutions at both research and commercial implementation level.

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Section: Introductionmentioning

confidence: 99%

Dynamic Energy Analysis of Different Heat Pump Heating Systems Exploiting Renewable Energy Sources

et al. 2023

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“…The model was successively validated by experimental data. The authors found that the system performance is affected, respectively, by the outdoor air temperature, the tank volume and collector surface area [8]. The SAHP system can be integrated with thermal solar collectors, to use as the heat source, but also with photovoltaic (PV) panels to supply electricity as well as in hybrid configurations.…”

Section: Introductionmentioning

confidence: 99%

Energy Evaluations of a New Plant Configuration for Solar-Assisted Heat Pumps in Cold Climates

et al. 2023

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Heat pumps in buildings allow for the limiting of CO2 emissions by exploiting directly the renewable energy available in the external environment (aerothermal, hydrothermal and geothermal sources). Moreover, other renewable technologies such as active solar systems can be integrated easily into use with them. This combination not only increases the share of primary energy provided by renewable sources for heating/cooling but also improves the heat pump performance indices. Nevertheless, in cold climates, air–water heat pumps should be equally penalized due to the unfavorable outdoor air temperature. Conversely, a water–water heat pump, connected with a solar tank and thermal solar collectors, overcomes this issue. Indeed, the higher temperature attainable in the cold source allows for reaching greater COPs, and when the solar tank temperature level is enough, emitters can be directly supplied, avoiding the absorption of electric energy. In this paper, this plant configuration, in which a further tank after the heat pump was considered to manage the produced thermal energy, is investigated. Proper control strategies have been developed to increase the renewable share. Regarding a reference residential building located in Milan, for which the water–water heat pump was sized properly, a parametric study, carried out in TRNSYS by varying solar tank volume and collecting surface, has allowed for the identification of the optimal system configuration. A renewable share, ranging between 54% and 61% as a function of the collecting surface and the storage volume, was detected, as was an average seasonal coefficient of performance (SCOP) over 4. Regarding two common heating plant configurations using an assisted PV air-to-water heat pump and a gas boiler, the optimal solution allows for the limiting of CO2 emissions by 33% and 53%, respectively.

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Simulation and experiment of a photovoltaic—air source heat pump system with thermal energy storage for heating and domestic hot water supply

et al. 2023

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Applicability and comparison of solar-air source heat pump systems between cold and warm regions of plateau by transient simulation and experiment

Cited by 10 publications

References 23 publications

Dynamic Energy Analysis of Different Heat Pump Heating Systems Exploiting Renewable Energy Sources

Dynamic Energy Analysis of Different Heat Pump Heating Systems Exploiting Renewable Energy Sources

Energy Evaluations of a New Plant Configuration for Solar-Assisted Heat Pumps in Cold Climates

Simulation and experiment of a photovoltaic—air source heat pump system with thermal energy storage for heating and domestic hot water supply

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