Study on the Effect of Ground Heat Storage by Solar Heat Using Numerical Simulation

Oh, Juhyun; Nam, Yujin

doi:10.3390/en81212388

Cited by 5 publications

(5 citation statements)

References 12 publications

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“…where nr is the rotation speed, M1 is the fundamental wave amplitude of the residual magnetization intensity, σ is the conductivity, μ is the permeability, p is the number of pole pairs, Ds1 is the inner diameter of the stator, δ is the gap length, and L is the axial length Equation (1) indicates the relationship between the parameters and the thermal power of the converter. A prototype, with a rated speed of 1500 rpm and a rated power of 1.2 kW, is designed based on Equation (1).…”

Section: Thermal Power Calculationmentioning

confidence: 99%

“…The primary, most direct and simplest method to obtain heat is by collecting radiation from the sun. However, the extensive application of solar energy in providing heat is limited, due to the low energy density and discrepancies between collection time and use time [1]. Consequently, the combustion of fossil fuels, such as coal, oil and gas, remains as the more economical and practical method of providing heat [2].…”

Section: Introductionmentioning

confidence: 99%

“…A prototype, with a rated speed of 1500 rpm and a rated power of 1.2 kW, is designed based on Equation (1). The parameters of this prototype are listed in Table 1, and its photograph is provided in Figure 5.…”

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confidence: 99%

See 2 more Smart Citations

Investigation of a Novel Mechanical to Thermal Energy Converter Based on the Inverse Problem of Electric Machines

et al. 2016

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A novel converter that can directly transform electrical, wind, hydraulic and other types of mechanical energy into thermal energy is presented in this study. First, the thermal energy of the converter is classified and then calculated by a finite element method. The eddy current distribution in the stator of the converter is also discussed. Second, the temperature field of the converter is calculated using a boundary element method. Subsequently, a thermal power-temperature coupled calculation method is presented to calculate the actual thermal power and temperature of the converter. The characteristic curves of the actual thermal power and the increase in water flow temperature are then presented based on the calculation results. Lastly, an experimental system is built, the thermal power and temperature of the converter are measured and the experimental results and the analytical calculations are compared.

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Section: Thermal Power Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of a Novel Mechanical to Thermal Energy Converter Based on the Inverse Problem of Electric Machines

et al. 2016

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“…Q condens (7) In the cooling season, the compressor power, the heat absorbed by the evaporator, and that rejected by the condenser are related as:…”

Section: Analysis Methodsmentioning

confidence: 99%

Performance Analysis of Integrated Photovoltaic-Thermal and Air Source Heat Pump System through Energy Simulation

2022

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The concept of zero energy buildings (ZEBs) has recently been actively introduced in the building sector, globally, to reduce energy consumption and carbon emissions. For the implementation of ZEBs, renewable energy systems, such as solar collectors, photovoltaic (PV) systems, and ground source heat pump (GSHP) systems, have been used. The system performance of solar collectors and PV systems are dependent on the weather conditions. A GSHP system requires a large area for boring machines and mud pump machines. Therefore, inhabitants of an existing small-scale buildings hesitate to introduce GSHP systems due to the difficulties in installation and limited construction area. This study proposes an integrate photovoltaic-thermal (PVT) and air source heat pump (ASHP) system for realizing ZEB in an existing small-scale building. In order to evaluate the applicability of the integrated PVT-ASHP system, a dynamic simulation model that combines the PVT-ASHP system model and the building load model based on actual building conditions was constructed. The heating and cooling performances of the system for one year were analyzed using the dynamic simulation model. As the simulation analysis results, the average coefficient of performance (COP) for heating season was 5.3, and the average COP for cooling season was 16.3., respectively. From April to June, the electrical produced by the PVT module was higher than the power consumption of the system and could realize ZEB.

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“…In terms of the solar system, a SAGHP system can resolve several problems such as irregular solar energy production or mismatch between the sunshine duration and operation time. Moreover, it can prevent the ground temperature drop which happens when a ground heat pump system is used continuously and excessively [1]. By utilizing multiple heat sources simultaneously at peak load, the ground temperature can remain stable.…”

Section: Introductionmentioning

confidence: 99%

Study on the System Design of a Solar Assisted Ground Heat Pump System Using Dynamic Simulation

Nam

et al. 2016

Energies

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Abstract:Recently, the use of hybrid systems using multiple heat sources in buildings to ensure a stable energy supply and improve the system performance has gained attention. Among them, a heat pump system using both solar and ground heat was developed and various system configurations have been introduced. However, establishing a suitable design method for the solar-assisted ground heat pump (SAGHP) system including a thermal storage tank is complicated and there are few quantitative studies on the detailed system configurations. Therefore, this study developed three SAGHP system design methods considering the design factors focused on the thermal storage tank. Using dynamic energy simulation code (TRNSYS 17), individual performance analysis models were developed and long-term quantitative analysis was carried out to suggest optimum design and operation methods. As a result, it was found that SYSTEM 2 which is a hybrid system with heat storage tank for only a solar system showed the highest average heat source temperature of 14.81˝C, which is about 11˝C higher than minimum temperature in SYSTEM 3. Furthermore, the best coefficient of performance (COP) values of heat pump and system were 5.23 and 4.32 in SYSYEM 2, using high and stable solar heat from a thermal storage tank. Moreover, this paper considered five different geographical and climatic locations and the SAGHP system worked efficiently in having high solar radiation and cool climate zones and the system COP was 4.51 in the case of Winnipeg (Canada) where the highest heating demand is required.

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Study on the Effect of Ground Heat Storage by Solar Heat Using Numerical Simulation

Cited by 5 publications

References 12 publications

Investigation of a Novel Mechanical to Thermal Energy Converter Based on the Inverse Problem of Electric Machines

Investigation of a Novel Mechanical to Thermal Energy Converter Based on the Inverse Problem of Electric Machines

Performance Analysis of Integrated Photovoltaic-Thermal and Air Source Heat Pump System through Energy Simulation

Study on the System Design of a Solar Assisted Ground Heat Pump System Using Dynamic Simulation

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