Experimental research on a solar air-source heat pump system with phase change energy storage

Chen, Haifei; Li, Jing; Cai, Baorui; Zhang, Fuwei; Lü, Tao; Yang, Jie; Lv-lin, Jiang; Zhang, Yang; Zhou, Jinzhi

doi:10.1016/j.enbuild.2020.110451

Cited by 13 publications

(4 citation statements)

References 31 publications

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“…In Figure 4 and in Equation ( 5) R1, R2, R3 and R4 represent thermal resistances due to convection heat transfer on the inside of tubes, conductive heat transfer through the tube wall, heat transfer from outside of the tube to the PCM and heat transfer from the fins to the PCM, respectively, as given in Equations ( 6)- (9).…”

Section: Computational Modelmentioning

confidence: 99%

“…Experimental research on heat pump systems with LTES in the available literature mostly has been performed using multiple measurements over several days with different ambient conditions and operating strategies [5][6][7][8][9][10]. Numerical research on heat pump systems with LTES in the literature has been performed using various dynamic system simulation software that allow modeling of the mutual interaction of thermal systems and heating loads under transient boundary conditions [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Computational Model of Shell and Finned Tube Latent Thermal Energy Storage Developed as a New TRNSYS Type

2022

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This paper presents the development of a computational model of latent thermal energy storage (LTES) in a shell and tube configuration with longitudinal fins. The model describes the physical process of transient heat transfer between the heat transfer fluid (HTF) and the phase change material (PCM) in LTES. For modeling the phase change of the PCM, the enthalpy formulation was used. Based on a one-dimensional computational model, a new Trnsys type was developed and written in Fortran. Validation of the LTES model was performed by comparing numerically and experimentally obtained data for the melting and solidification of paraffin RT 25 as the PCM and water as the HTF. Numerical investigations of the effect of HTF inlet temperature and HTF flow rate on heat transfer in LTES confirmed that significant improvement in heat transfer between the HTF and PCM could be achieved by increasing the HTF inlet temperature during charging or decreasing the HTF inlet temperature during discharging. Increasing the HTF flow rate did not significantly improve the heat transfer between the HTF and PCM, both during charging and discharging. The presented, experimentally validated LTES model could be used to analyze the feasibility of integrating LTES into various thermal systems and ultimately help define the specific benefits of implementing LTES systems.

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Section: Computational Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Computational Model of Shell and Finned Tube Latent Thermal Energy Storage Developed as a New TRNSYS Type

2022

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“…This innovative approach is expected to provide a more reliable solution for the application of solar energy in crude oil storage. The solar thermal storage technologies of sensible heat storage [26], latent heat storage (phase change storage) [27,28], and thermochemical energy storage [29] are three important methods for solar thermal utilization and peak shifting [30,31]. Among them, sensible heat storage is the most widely used and has a strong application basis [26,32], but the unit energy storage density of sensible heat storage is slightly insufficient compared with that of phase-change energy storage [33,34].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Influence Factors of the Crude Oil Temperature Maintenance System of Solar Sewage Heat Pumps in Cold Regions

Zhu,

Gu,

Duan

et al. 2023

Energies

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Traditional crude oil heating methods that use fossil fuels or electricity have the disadvantages of high consumption of nonrenewable resources, low energy utilization, and high carbon emissions. Therefore, it is urgent to develop green and sustainable crude oil heating technologies. In this paper, a solar synergistic sewage heat pump (SSHS) dual heat source crude oil temperature maintenance system is proposed. The system utilizes clean and sustainable solar energy to heat crude oil while combining sensible heat storage technology and the waste heat utilization technology of a sewage source heat pump to solve the unstable fluctuation of the solar heating problem. A simulation and analysis model is established to analyze the influencing factors of the SSHS, and the optimal operation scheme is provided. The results show that the efficiency of the solar collector decreases and the proportion of crude oil heating increases with an increase in the solar energy guarantee rate, while the unit flow rate of the pump has a large impact on the performance of the sewage source heat pump. In order to avoid energy waste, it is more appropriate to adopt a 30% guarantee rate and an A3 pump unit flow rate, under which the solar collector efficiency is 50.18%, the proportion of solar heating of crude oil is 47.16%, the average temperature of crude oil is 42.59 °C, and the COP of the sewage source heat pump is 4.65. Further increases in the COP of the wastewater source heat pump can be realized by increasing the temperature of the wastewater supply. The results of this study provide a valuable reference for the optimization of crude oil storage heating systems.

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“…Adding heat storage system to air source heat pump system can further shorten the operation time of the heat pump under unfavorable working conditions and improve the low temperature performance of the unit. Chen et al [ 12 ] conducted an experimental study on solar-air source heat pump system with heat storage device, and the results showed that the utilization of solar heat storage for heating at cold night could reduce the heating demand for the unit and effectively reduce the energy consumption of the unit. The COP of the system in extreme weather was maintained above 1.7.…”

Section: Introductionmentioning

confidence: 99%

Computational Intelligence Powered Performance Analysis on Phase Change Heat Storage Air Source Heat Pump System

Yin¹,

Zhan

et al. 2022

Computational Intelligence and Neuroscience

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Aiming at the performance deterioration of air source heat pump at low temperature in cold area, an air source heat pump system with sodium chloride aqueous solution as low temperature phase change heat storage material was proposed to increase the air inlet temperature of the unit under low temperature conditions and improve the low temperature performance of the heat pump unit. The system form, unit energy consumption model, and economic model were given, and the operating economy of the traditional electric auxiliary heat air source heat pump system and the phase change heat storage air source heat pump system were compared through computational intelligence powered methods. On this basis, the operation economy of the heat pump system using different concentrations of sodium chloride solution as the heat storage material was simulated and optimized, and the operation efficiency and energy-saving performance of the system were analyzed by taking an actual residential building in a cold area as an example. The simulation results showed that the Heating Seasonal Performance Factor (HSPF) of the heat pump system using 8.5% sodium chloride aqueous solution as the heat storage material is 2.24, and the HSPF of the traditional electric auxiliary heat pump system is 1.83. Compared with the traditional electric auxiliary heat pump system, the phase change heat storage heat pump system saves heating energy consumption by 19.6% and defrosting energy consumption by 38.8%. The heat pump system using 10% sodium chloride aqueous solution as the heat storage material has the best operating economy, and the system HSPF is 2.33, which saves heating energy consumption by 23.2% and defrosting energy consumption by 34% compared with the traditional heat pump system. The operation condition of phase change heat storage air source heat pump system is stable, and the system performance is significantly improved.

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Experimental research on a solar air-source heat pump system with phase change energy storage

Cited by 13 publications

References 31 publications

Computational Model of Shell and Finned Tube Latent Thermal Energy Storage Developed as a New TRNSYS Type

Computational Model of Shell and Finned Tube Latent Thermal Energy Storage Developed as a New TRNSYS Type

Analysis of the Influence Factors of the Crude Oil Temperature Maintenance System of Solar Sewage Heat Pumps in Cold Regions

Computational Intelligence Powered Performance Analysis on Phase Change Heat Storage Air Source Heat Pump System

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