Using of heat thermal storage of PCM and solar energy for distributed clean building heating: A multi-level scale-up research

Wang, Lu; Guo, Leihong; Ren, Jing; Kong, Xiangming

doi:10.1016/j.apenergy.2022.119345

Cited by 61 publications

(9 citation statements)

References 47 publications

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“…The evaluations were calculated for the energy consumption of ventilation and filtration systems [ 11 , 50 , 51 , 52 ] and the operating cost-effectiveness of the ventilation and filtration systems. The optimal return air heights for different types of supply air were subsequently identified, and, thus, the results can not only meet the air quality requirements, but also save energy.…”

Section: Resultsmentioning

confidence: 99%

Effects of Return Air Inlets’ Location on the Control of Fine Particle Transportation in a Simulated Hospital Ward

Ren

Duan

Guo

et al. 2022

IJERPH

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The COVID-19 pandemic has made significant impacts on public health, including human exposure to airborne pathogens. In healthcare facilities, the locations of return air vents in ventilation systems may have important effects on lowering airborne SARS-CoV-2 transmission. This study conducted experiments to examine the influence of different return air vents’ heights (0.7 m, 1.2 m, and 1.6 m) on the particle removal effects in a simulated patient ward. Three different ventilation systems were examined: top celling air supply-side wall return (TAS), underfloor air supply-side wall return (UFAS) and side wall air supply-side wall return (SAS). CFD simulation was applied to further study the effects of return air inlets’ heights (0.3 m, 0.7 m, 1.2 m, 1.6 m, and 2.0 m) and air exchange rates. The technique for order of preference by similarity to ideal solution (TOPSIS) analysis was used to calculate the comprehensive scores of 60 scenarios using a multi-criterion method to obtain the optimal return air inlets’ heights. Results showed that for each additional 0.5 m distance in most working conditions, the inhalation fraction index of medical staff could be reduced by about 5–20%. However, under certain working conditions, even though the distances between the patients and medical personnel were different, the optimal heights of return air vents were constant. For TAS and UFAS, the optimal return air inlets’ height was 1.2 m, while for SAS, the best working condition was 1.6 m air supply and 0.7 m air return. At the optimum return air heights, the particle decay rate per hour of SAS was 75% higher than that of TAS, and the rate of particle decay per hour of SAS was 21% higher than that of UFAS. The location of return air inlets could further affect the operating cost-effectiveness of ventilation systems: the highest operating cost-effectiveness was 8 times higher than the lowest one.

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Section: Resultsmentioning

confidence: 99%

Effects of Return Air Inlets’ Location on the Control of Fine Particle Transportation in a Simulated Hospital Ward

Ren

Duan

Guo

et al. 2022

IJERPH

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“…8–11 Ghalambaz et.al 12,13 studied the effects of hybrid nanoparticles on the melting process of a nano-enhanced phase-change material inside different shaped enclosure. Wang et al 14 conducted a techno-economic analysis of the electric heat storage system coupled with solar energy using PCM in a three-story office building. Compared with the centralized heating method, the proposed TES system could save up to 61% of heating cost.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer investigation on the thermal energy storage using phase change material in low-carbon building

Xia,

Li,

XiangLi

et al. 2024

Building Services Engineering Research and Technology

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The use of high-conductivity porous medium is an effective method to enhance the heat transfer rate of phase change material (PCM) in thermal energy storage (TES), reducing the energy consumption of low-carbon buildings. This paper establishes a solid-liquid phase change lattice Boltzmann model of a TES unit and investigates the effects of Rayleigh number, inclination angle, porous array, and porosity. The findings indicate that inserting the porous medium enhances conductive heat transfer and weakens convective heat transfer. When the Rayleigh number is increased from 103 to 104, the liquid fraction increases by 3.0%, while an increase from 104 to 105 only results in a 1.6% increase, suggesting a diminishing effect of increasing the Rayleigh number. Results also show that the inclination angle can be disregarded in this study. Furthermore, increasing the specific surface area enhances conductive heat transfer. However, when the array n is changed to 7, the fastest variation of liquid fraction is obtained among the range from 5 to 9. Increasing the porosity will delay the moment that temperature standard deviation reaches to the maximum, getting the temperature distribution more nonuniform. The findings from this paper are valuable for the design of TES systems in low-carbon buildings. Practical application The porous medium can enhance heat transfer in the phase change process. In the field of low-carbon buildings, porous medium is applied to strengthen the energy storage rate. By investigating the parameters of the Rayleigh numbers, inclination angles, porosities and arrangement of porous medium arrays of the composed energy storage unit, the regularity of the effects on the energy characteristics are obtained, which would provide some valuable practice references for designing these parameters of the energy storage units in the future energy-efficient building sector.

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“…However, due to the intermittent shortage of solar energy, it is critical for CSDH systems to find an auxiliary heat source (AHS) with high cost performance (Bava et al, 2016). Common forms of AHS include the boiler system or heat pump system (Chen et al, 2022;Kong et al, 2022). The traditional design of AHS must ensure that the building can meet the heat load of the whole building.…”

Section: Introductionmentioning

confidence: 99%

Research on the optimization of the clean heating system for regional residential buildings based on the multi-objective optimization strategy

Fu,

Wang,

Long

2024

Front. Energy Res.

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For the residential building district heating (RBDH) system, choosing the appropriate combination of heat sources according to local conditions is the key to improving economic efficiency. In this study, three climatic regions in China were selected, namely, a hot summer and cold winter region, cold region, and severe cold region. Among them, Nanjing, Tianjin, and Shenyang were selected as typical representative cities in the hot summer and cold winter region, cold region, and severe cold region, respectively. Taking the levelized cost of heat (LCOH) as the economic evaluation index and considering the carbon emission cost of the system operation, the energy consumption and the CO2 emissions were analyzed. TRNSYS software was used to simulate and analyze the system performance. The multi-objective optimization based on a genetic algorithm was proposed to optimize system parameters. From an economic point of view, the SA system was suitable for the hot summer and cold winter region, the SAS system was suitable for the cold region, and the SE system was suitable for the severe cold region. The operation control strategy based on quality adjustment can reduce heating energy consumption and maintain indoor temperatures at approximately 20°C. The proportion of clean energy heating in the optimized heating system decreased after the multi-objective optimization strategy. However, the initial investment and maintenance costs of the system were reduced, which reduced the LOCH of the system. Therefore, the multi-objective optimization strategy can effectively reduce the heating costs.

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Using of heat thermal storage of PCM and solar energy for distributed clean building heating: A multi-level scale-up research

Cited by 61 publications

References 47 publications

Effects of Return Air Inlets’ Location on the Control of Fine Particle Transportation in a Simulated Hospital Ward

Effects of Return Air Inlets’ Location on the Control of Fine Particle Transportation in a Simulated Hospital Ward

Heat transfer investigation on the thermal energy storage using phase change material in low-carbon building

Research on the optimization of the clean heating system for regional residential buildings based on the multi-objective optimization strategy

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