Experimental and numerical study of PCM storage integrated with HVAC system for energy flexibility

Hu, Yue; Heiselberg, Per; Drivsholm, Christian; Søvsø, Asger Skød; Vogler-Finck, Pierre; Kronby, Kim

doi:10.1016/j.enbuild.2021.111651

Cited by 20 publications

(3 citation statements)

References 24 publications

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“…Much literature on liquid/PCM heat-exchangers evaluates the effect of surfaceenlargement like with the addition of fins [16,17]. The analyses reported by other workers generally compare numerical and experimental approaches [18]. Nevertheless, there is no consensus in the literature about the best numerical approach since it depends on the system configuration.…”

Section: Introductionmentioning

confidence: 99%

Performance of a Phase Change Material Battery in a Transparent Building

Engel¹,

Malin²,

Venkatesh³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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This research evaluates the performance of a Phase Change Material (PCM) battery integrated into the climate system of a new transparent meeting center. The main research questions are: a. "Can the performance of the battery be calculated?" and b. "Can the battery reduce the heating and cooling energy demand in a significant way?" The first question is answered in this document. In order to be able to answer the second question, especially the way the heat loading in winter should be improved, then more research is necessary. In addition to the thermal battery, which consists of Phase Change Material plates, the climate system has a cross-flow heat exchanger and a heat pump. The battery should play a central role in closing the thermal balance of the lightweight building, which can be loaded with hot return or cold outdoor air. The temperature of the battery plates is monitored by multi-sensors and simulated by the use of PHOENICS (Computational Fluid Dynamics) and MATLAB. This paper reports reasonable agreement between the numerical predictions and the measurements, with a maximum variance of 10%. The current coefficient of performance for heating and cooling is already high, more than 27. There is scope for increasing this much further by making use of the very low-pressure difference of the battery (below 25 Pascal), low pressure fans and the ventilation system as a whole.

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Section: Introductionmentioning

confidence: 99%

Performance of a Phase Change Material Battery in a Transparent Building

Engel¹,

Malin²,

Venkatesh³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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“…Phase change materials (PCMs) have been widely studied for applications in TES for buildings because of their inherently high energy storage density resulting from a high latent heat of fusion. By utilizing latent heat, a lower volume of PCM can store 5–14 times more energy than materials such as concrete, bricks, or wood, which can only store thermal energy in the form of sensible heat . Ultimately, this technology allows for improved regulation of thermal comfort while also reducing or shifting HVAC loads.…”

Section: Introductionmentioning

confidence: 99%

“…By utilizing latent heat, a lower volume of PCM can store 5−14 times more energy than materials such as concrete, bricks, or wood, which can only store thermal energy in the form of sensible heat. 7 Ultimately, this technology allows for improved regulation of thermal comfort while also reducing or shifting HVAC loads. Some experimental studies demonstrating the benefits of PCMs in HVAC systems include modular PCM storage as part of a heat pump air system, 8 PCM plates integrated into the condenser of an air-conditioning unit, 9 and PCM-integrated air-conditioning ducts.…”

Section: Introductionmentioning

confidence: 99%

Surface-Modified Compressed Expanded Graphite for Increased Salt Hydrate Phase Change Material Thermal Conductivity and Stability

Blackley,

Lai,

Odukomaiya

et al. 2023

ACS Appl. Energy Mater.

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Enhancing the Performance of Split Unit Air‐Conditioning System by Integrating Air–PCM Heat Transfer Unit: Numerical and Experimental Assessment

Hussein,

Abdul‐Zahra,

Al Jubori

2024

Heat Trans

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The growing need for energy‐efficient cooling solutions has driven the exploration of cutting‐edge technologies in air‐conditioning (AC) systems. Therefore, this research aims to improve the energy efficiency of a split AC system by incorporating a phase change material (PCM) heat transfer element into the AC system. PCM can release and store thermal energy, assisting in decreasing the load on the AC system during peak cooling periods. The PCM utilized in the study is Rubitherm RT18HC. The study includes numerical and experimental evaluations to assess the impact of the air–PCM unit on the split unit's performance. The numerical simulations were conducted using computational fluid dynamics models based on ANSYS‐Fluent to choose the best design and conditions for the air–PCM unit. The experimental study was conducted in the hot environment of Iraq, where outdoor temperatures exceed 43°C. The numerical results showed that the best design and conditions concluded to be a 1‐cm PCM height in the panels, 3 cm air channel height, 0.9 m/s air velocity for charging, 0.45 m/s air velocity for discharging, 7°C inlet air temperature for charging, and 25°C inlet air temperature for discharging. In the experimental part, after validating the theoretical results, two practical cases were conducted to evaluate the split unit performance with and without PCM. The results showed an average of 5% lower room temperature, 9.5% lower air entering the evaporator temperature, 10% lower energy consumption, and a 12.5% increase in the AC unit's coefficient of performance when using the air–PCM heat transfer unit.

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Experimental and numerical study of PCM storage integrated with HVAC system for energy flexibility

Cited by 20 publications

References 24 publications

Performance of a Phase Change Material Battery in a Transparent Building

Performance of a Phase Change Material Battery in a Transparent Building

Surface-Modified Compressed Expanded Graphite for Increased Salt Hydrate Phase Change Material Thermal Conductivity and Stability

Enhancing the Performance of Split Unit Air‐Conditioning System by Integrating Air–PCM Heat Transfer Unit: Numerical and Experimental Assessment

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