System design and energy performance of a solar heat pump heating system with dual-tank latent heat storage

Qu, Shilin; Ma, Fei; Ji, Ren; Wang, Dongxu; Yang, Lei

doi:10.1016/j.enbuild.2015.07.040

Cited by 42 publications

(12 citation statements)

References 23 publications

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“…Qu et al [15] presented a so-called 'daily average collection efficiency'. When the efficiency of the solar thermal collector reached 50%, the maximum COP of the system could get up to 10.…”

Section: Pcm Used In Air-conditionermentioning

confidence: 99%

Experimental study on performance of a solar-air source heat pump system in severe external conditions and switchover of different functions

Shang

et al. 2016

Sustainable Energy Technologies and Assessments

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Section: Pcm Used In Air-conditionermentioning

confidence: 99%

Experimental study on performance of a solar-air source heat pump system in severe external conditions and switchover of different functions

Shang

et al. 2016

Sustainable Energy Technologies and Assessments

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“…With the increasing demand for efficient energy systems to reduce the mismatch between supply and demand of energy, there is a need to develop efficient thermal energy storage (TES) systems that can store energy from time-variable sources and match timevariable demands with a constant output source [1]. The interest in energy storage devices based on latent energy storage using phase change materials (PCMs) is rapidly growing due to their isothermal nature and high energy storage density [2], resulting in compact and reduced-weight, lower cost systems [3,4] when compared to sensible thermal energy storage systems. Since there are many types of PCMs, which melt at widely varying temperature ranges, they have been used in diverse applications, such as solar heating [2], peak-load shifting for building cooling [3], pulsed-power applications [4], and space energy storage applications [5].…”

Section: Introductionmentioning

confidence: 99%

A 1D Reduced-Order Model (ROM) for a Novel Latent Thermal Energy Storage System

2022

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Phase change material (PCM)-based thermal energy storage (TES) systems are widely used for repeated intermittent heating and cooling applications. However, such systems typically face some challenges due to the low thermal conductivity and expensive encapsulation process of PCMs. The present study overcomes these challenges by proposing a lightweight, low-cost, and low thermal resistance TES system that realizes a fluid-to-PCM additively manufactured metal-polymer composite heat exchanger (HX), based on our previously developed cross-media approach. A robust and simplified, analytical-based, 1D reduced-order model (ROM) was developed to compute the TES system performance, saving computational time compared to modeling the entire TES system using PCM-related transient CFD modeling. The TES model was reduced to a segment-level model comprising a single PCM-wire cylindrical domain based on the tube-bank geometry formed by the metal fin-wires. A detailed study on the geometric behavior of the cylindrical domain and the effect of overlapped areas, where the overlapped areas represent a deviation from 1D assumption on the TES performance, was conducted. An optimum geometric range of wire-spacings and size was identified. The 1D ROM assumes 1D radial conduction inside the PCM and analytically computes latent energy stored in the single PCM-wire cylindrical domain using thermal resistance and energy conservation principles. The latent energy is then time-integrated for the entire TES, making the 1D ROM computationally efficient. The 1D ROM neglects sensible thermal capacity and is thus applicable for the low Stefan number applications in the present study. The performance parameters of the 1D ROM were then validated with a 2D axisymmetric model, typically used in the literature, using commercially available CFD tools. For validation, a parametric study of a wide range of non-dimensionalized parameters, depending on applications ranging from pulsed-power cooling to peak-load shifting for building cooling application, is included in this paper. The 1D ROM appears to correlate well with the 2D axisymmetric model to within 10%, except at some extreme ranges of a few of the non-dimensional parameters, which lead to the condition of axial conduction inside the PCM, deviating from the 1D ROM.

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“…Qu et al. 7 investigated the energy efficiency of an SAHP heating system of double-tank latent heat storage in an experimental study. They defined a new performance parameter to evaluate the design of the PCM thermal storage system and showed that the system efficiency was about 50% with latent heat storage.…”

Section: Introductionmentioning

confidence: 99%

Designing a novel solar-assisted heat pump system with modification of a thermal energy storage unit

Aktaş

Koşan

Tuncer

2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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The integrated usage of solar energy systems, heat pump applications, and thermal energy storage units is an effective way for heating systems due to their sustainability and stability in operations. In this study, a novel direct solar-assisted heat pump with thermal energy system has been designed which uses the solar collector as the evaporator of the heat pump. Besides, two-dimensional transient numeric analyses have been conducted for the thermal energy storage unit using the ANSYS Fluent 16.2 commercial software package. With this direct system, the heat required for heating systems is supplied from the condenser with the heat received from the solar collector of the working fluid. For an effective and high performance system, the solar collector is designed as a double-pass which provided superheating of the working fluid. It is aimed to store the surplus energy from the solar energy in the thermal energy storage unit and to operate the system continuously and efficiently in both sunny and overcast weather conditions. Furthermore, the system has been analyzed theoretically and the results show that coefficient of performance may improve. As a result, this newly designed system can be successfully applied for thermal applications.

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System design and energy performance of a solar heat pump heating system with dual-tank latent heat storage

Cited by 42 publications

References 23 publications

Experimental study on performance of a solar-air source heat pump system in severe external conditions and switchover of different functions

Experimental study on performance of a solar-air source heat pump system in severe external conditions and switchover of different functions

A 1D Reduced-Order Model (ROM) for a Novel Latent Thermal Energy Storage System

Designing a novel solar-assisted heat pump system with modification of a thermal energy storage unit

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