Experimental and numerical investigation of discharging process of direct contact thermal energy storage for use in conventional air-conditioning systems

Li, Xiaoyan; Qu, Dong-Qi; Liu, Yang; Li, Kaidi

doi:10.1016/j.apenergy.2016.11.094

Cited by 33 publications

(5 citation statements)

References 21 publications

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“…From Fig. 7 it is clear that the discharge rate of the PCM must be controlled in order to effectively utilize the released cooling power, which is in agreement with outcomes of relevant studies [21]. The lower the flow rate, the lower both heat transfer rate in the RPW-HEX.…”

Section: Thermal Energy Storage Charging-discharging Testsupporting

confidence: 84%

Energy assessment based on semi-dynamic modelling of a photovoltaic driven vapour compression chiller using phase change materials for cold energy storage

Varvagiannis

Charalampidis²,

Zsembinszki³

et al. 2021

Renewable Energy

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Solar cooling systems are a promising solution for reducing the electrical consumption of conventional building cooling systems. Among various alternatives, photovoltaic driven vapour compression chillers are currently the most mature and economically feasible solar cooling technology. This study focuses on the semi-dynamic modelling of a vapour compression chiller coupled with a novel refrigerant-phase change material (PCM)-water heat exchanger (RPW-HEX) which replaces the conventional chiller's evaporator, allowing the efficient storage of the produced cooling energy. A custom-build lumped parameter model was developed in TRNSYS and was used to assess the performance of the proposed system on annual basis. Using as benchmark a conventional PV driven vapour compression chiller with electrical storage, the retrofitted hybrid storage system showed improved performance, limiting the cooling demand peaks and enhancing the solar fraction, especially for partial cooling loads. Last, a comparison of the PCM thermal energy storage to conventional batteries was carried out, leading to enhanced performance characteristics for the latter.

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Section: Thermal Energy Storage Charging-discharging Testsupporting

confidence: 84%

Energy assessment based on semi-dynamic modelling of a photovoltaic driven vapour compression chiller using phase change materials for cold energy storage

Varvagiannis

Charalampidis²,

Zsembinszki³

et al. 2021

Renewable Energy

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show abstract

“…It has been shown that the higher the flow rate of liquid PCM, the shorter the charging time of the system and the faster the rate of heat storage for a constant HTF inlet temperature, but the flow rate needs to be kept within a certain range for the PCM to be fully phase‐transformed. When HTF and PCM exchange positions, 71 similar conclusions are drawn, the flow rate of HTF will affect charging time of the system, but too high will lead to greater flow resistance and uneven heat transfer. Wang et al 62 also came to this conclusion.…”

Section: Research On the Direct Contact Heat Transfer Processmentioning

confidence: 79%

Research progress of direct contact heat storage based on phase change heat storage

Liu,

Wang,

Chen

et al. 2024

Energy Storage

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Phase change heat storage presents a promising solution to address challenges related to new energy intermittency and waste heat recovery. However, for it to function as an effective energy hub, heat storage becomes crucial. Among the available options, the direct contact heat accumulator stands out due to its simple structure, substantial heat transfer area, and minimal heat transfer resistance, making it a favorable choice for enhancing energy storage rates. Although a great deal of research has been done on phase change materials and heat accumulators over the years, a systematic review of direct‐contact heat accumulators is lacking. This article reviews the related research on direct contact heat storage, aiming to summarize the research work on direct contact phase change heat storage systems. Various phase change materials (PCMs) for direct contact systems are analyzed, and the study of PCM melting crystallization behavior, heat transfer coefficients and system performance in direct contact systems is summarized, as well as the improvement methods for direct contact vessels and PCMs. It provides a useful reference for future research on direct‐contact heat storage systems.

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“…where When u rα =u rβ =0 in formula (28), the equations of rotor flux linkage of motor were given by: Next, three-phase stator current was transformed from 3s to 2r, the excitation component current i d and torque component current i q were obtained. This time, the important parameters of three-phase asynchronous motor were calculated as follows:…”

Section: I(m)=i(m-1) V(m)=v(m-1)mentioning

confidence: 99%

“…So, phase change material (PCM), especially ice thermal storage, was employed in air conditioning in recent years. [27][28][29] Ice thermal storage was first applied in PV directly driving refrigerator by Axaopoulos. 30 Results showed that refrigerator compressor was of variable speed and ice produce of the refrigerator reached 17 kg, but the refrigerator started and stopped frequently for the instantaneous variation of solar irradiance.…”

mentioning

confidence: 99%

Impact of instantaneous solar irradiance on refrigeration characteristics of household PCM storage air conditioning directly driven by distributed photovoltaic energy

2022

Energy Science & Engineering

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The tension between power supply and demand is exacerbated for the increasing global refrigeration demand year by year. Therefore, refrigeration system driven by solar energy becomes one of the promising approaches to reduce or partially replace conventional refrigeration systems driven by power grid under the pressure of environmental protection and building energy conservation. Classified by operation mode, solar refrigeration is mainly composed of solar thermal refrigeration, solar photovoltaic refrigeration, and hybrid system consisting of solar thermal and photovoltaic energy. [1][2][3] Nowadays, the cost-effective advantage of photovoltaic (PV) refrigeration is prominent for the low PV module price. Therefore, PV refrigeration can attract many scholars for not only its considerable economic. More importantly, PV refrigeration reduces the dependence on power grid so as to effectively alleviate the contradiction between power supply and demand. [4][5][6] Besides, vapor compression refrigerator and air conditioning are important household appliances to improve people`s living standards, so most of the research work were focused on the PV refrigeration system.

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Experimental and numerical investigation of discharging process of direct contact thermal energy storage for use in conventional air-conditioning systems

Cited by 33 publications

References 21 publications

Energy assessment based on semi-dynamic modelling of a photovoltaic driven vapour compression chiller using phase change materials for cold energy storage

Energy assessment based on semi-dynamic modelling of a photovoltaic driven vapour compression chiller using phase change materials for cold energy storage

Research progress of direct contact heat storage based on phase change heat storage

Impact of instantaneous solar irradiance on refrigeration characteristics of household PCM storage air conditioning directly driven by distributed photovoltaic energy

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