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Parametric analysis of a packed bed thermal storage device with phase change material capsules in a solar heating system application

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Building Simulation 2021年第3期14卷 523-533页

作者： Long Gao Gegentana Junchao Bai Baizhong Sun Deyong Che Shaohua Li School of Energy and Power Engineering Northeast Electric Power UniversityJilin 132012China

The goal of this study is to investigate the effect of key design parameters on the thermal performance of the packed bed heat storage device by numerical calculation.A one-dimensional,non-equilibrium packed bed latent heat storage mathematical model was established and the applicability of the model was *** results demonstrate that the inlet temperature of the heat transfer fluid(HTF)had the greatest influence on each *** the inlet temperature increased from 333 K to 363 K,exergy destruction increased threefold,effective heat storage time decreased by 67%,effective heat storage increased by 38%,and exergy efficiency decreased by 11%.The decrease of the capsule diameter had a positive effect on each evaluation *** to the sensitivity analysis,the order of importance of each parameter within their variation range was HTF inlet temperature,HTF flow rate,PCM capsule size and PCM initial temperature.

关键词： packed bed thermal energy storage solar heating system performance evaluation parametric analysis

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Comparison and Performance Analysis of Heat Storage Equipment in solar heating system

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Journal of Donghua University(English Edition) 2013年第3期30卷 197-201页

作者：穆振英丁玉龙 Beijing Gas Group Corporation Ltd. State Key Laboratory of Multiphase Complex systems Institute of Process EngineeringChinese Academy of Sciences

solar heating system is widely used recently. Heat storage equipment is the guarantee for steady performance of solar heating system. A design of latent heat storage exchanger with submerged coil was introduced with the structure, working principle, and the main advantages. This heat exchanger was integrated into solar heating system as the heat storage equipment. Advantage comparison of the designed heat exchanger in solar heating system with hot water tank was carried out. The analysis results show that the latent heat storage exchanger is superior to hot water tank obviously. The heat exchanger performance parameters and variations of these parameters are got：（1） with the increase of phase change material （PCM） volume ratio, heat storage equipment volume ratio decreases; （2） heat storage efficiency has the same varying tendency with outdoor and air temperature; while the bigger PCM volume ratio is, the weaker the effect of outdoor air temperature on heat storage efficiency is; （3） heat storage capacity and heat storage efficiency increase together; when PCM volume ratio is big, heat storage efficiency is high and the system can begin operating effcienfly and quickly; （4） with the increase of heat storage capacity, life cyde operation cost （LCOC） of system increases gradually in high speed; but with the increase of PCM volume ratio, the difference between the two systems LCOCs becomes smaller and smaller; （5） the reasonable range of PCM volume ratio is 0.5 - 0.7. Temperature characteristic analysis shows that, with the filled PCM, heat storage medium temperature presents several segments at different time, under conditions of different heat storage capacity and different PCM state.

关键词： solar heating system latent heat storage exchanger with submerged coil hot water tank comparative analysis temperature characteristic

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Theoretical and Experimental Investigations of solar heating systems at Specified Output Conditions of Hot Water

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Journal of Energy and Power Engineering 2011年第9期5卷 842-847页

作者： W. Tadros M. Saadeldin S.A. Hassan solar Energy Department National Research Center Giza 12622 Egypt Physics Department Faculty of Science Cairo University Giza 12613 Egypt

The theoretical analysis discussed in this work is a suitable mathematical tool by which the performance of the proposed collector can be predicted. The obtained experimental results coincide with the obtained theoretical data obtained from the devised computer program. Controlled output temperature can be obtained from the proposed system. The performance of the tested collector under the proposed intermittent flow conditions overcomes that of the conventional thermosyphone flow collector.

关键词： solar collector thermal efficiency thermosyphone intermittent flow mass floW rate solar heating system

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Thermal Loss Analysis of a Flat Plate solar Collector Using Numerical Simulation

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Computers, Materials & Continua 2022年第12期73卷 4627-4640页

作者： Timur Merembayev Yedilkhan Amirgaliyev Murat Kunelbayev Didar Yedilkhan Institute of Information and Computational Technologies CS MES RK AlmatyKazakhstan International Information Technology University AlmatyKazakhstan Al-Farabi Kazakh National University AlmatyKazakhstan Astana IT University Nur-SultanKazakhstan

In this paper,we studied theoretically and numerically heated losses of a flat solar collector to model the solar water heating system for the Kazakhstan climate *** different climatic zones with a growing cost for energy or lack of central heating systems,promising is to find ways to improve the energy efficiency of the solar *** mathematical model(based on ordinary differential equation)simulated the solar system work process under different *** bridge the modeling and real values results,we studied the important physical parameters such as loss coefficient,Nu,Ra,and Pr *** impacted the efficiency of flat solar collectors and heat losses of the *** developed mathematical models,the design and composition of the software and hardware complex,and automated control and monitoring systems allow solar hot water heating systems to increase the energy efficiency of life support systems and heat supply of buildings by reducing energy consumption for heat *** simulation result showed that during the daytime,the temperature of water in the collector is 70°C;the storage of heated water since heated water is cooled at *** defined that a work period of the system can be extended with high efficiency(April-October)for Almaty region.

关键词： solar heating system heat loss coefficient dynamic simulation flat plate collector

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Improving performance of flat plate solar collector using nanofluid water/zinc oxide

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Journal of Central South University 2021年第11期28卷 3391-3403页

作者： SHOKRGOZAR ABBASI Ali KHAN Aghaiy Naser Department of Mechanical Engineering Payame Noor UniversityIran

In this article,the effect of using water/zinc oxide nanofluid as a working fluid on the performance of solar collector is investigated *** volumetric concentration of nanoparticles is 0.4%,and the particle size is 40 nm,and the mass flow rate of the fluid varies from 1 to 3 kg/*** this experiment,a device has been prepared with appropriate measuring instruments whose energy source is solar *** solar energy absorbed by the flat plate collector is absorbed by the nanofluid of water/zinc *** nanofluid is pumped to the consumer,a heat exchanger,where it heats the *** temperature,radiation level,flow rate,and pressure in different parts of the device were *** pressure drop and the heat transferred are the most important results of this experimental *** ASHRAE standard is used to calculate *** results showed that the use of water/zinc oxide nanofluid increases the collector performance compared to *** 1 kg/min of mass flow rate,the nanofluids have a 16% increase in efficiency compared to *** the results,it can be concluded that the choice of optimum mass flow rate in both water and nanofluid cases increases efficiency.

关键词： solar collector suspension solar heating system collector efficiency water/zinc oxide nanofluid

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