Analysis of Possibilities to Use Phase Change Materials in Heat Exchangers-Accumulators

Pakalka, Saulius; Valančius, Kęstutis; Čiuprinskas, Kęstutis; Pum, Dominik; Hinteregger, Markus

doi:10.3846/enviro.2017.270

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…This experimental investigation complements the previous research on possibilities to use PCM in heat exchangers-accumulators, simulation of PCM characteristics in thermal energy storage and investigation of the influence of mass flow rate on PCM behaviour (Pakalka et al, 2017(Pakalka et al, , 2018(Pakalka et al, , 2019.…”

Section: Introductionsupporting

confidence: 54%

Effect of Open and Closed Operation Modes on the Performance of Phase Change Material Based Copper Heat Exchanger

Pakalka

Valančius

Damonskis³

2020

International Conference “Environmental Engineering”

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Many studies related to latent heat thermal energy storage (LHTES) and performance of phase change materials (PCM) are focused on melting and solidification processes. Investigating and understanding the influence of various parameters on PCMs based thermal energy storage is the key to developing innovative and efficient energy storage systems. The aim of this study is to experimentally compare and assess the performance of phase change material based copper heat exchanger (PCM-HX) in different modes of operation. This PCM-HX is designed to be used in systems where thermal energy can be stored up to 90 °C and an organic PCM RT82 was selected as the energy storage medium. This study focuses on the pressure impact on the PCM melting (charging) and solidification (discharging) processes. Two different modes of operation were analysed: Open and Closed. In the case of an Open mode, the storage tank of PCM-HX was open to the atmosphere (pressure control valve open), in the case of Closed mode the storage tank was closed (pressure control valve closed). PCM charging and discharging processes were conducted and the PCM-HX performances were tested at different pressure inside the storage tank.

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Section: Introductionsupporting

confidence: 54%

Effect of Open and Closed Operation Modes on the Performance of Phase Change Material Based Copper Heat Exchanger

Pakalka

Valančius

Damonskis³

2020

International Conference “Environmental Engineering”

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“…A sizeable portion of the greenhouse gas emissions are caused by building construction and operation. The situation can be improved by taking measures in aspects such as building design, materials, heating and cooling systems, and energy-efficient technology [1,2]. Building energy consumption is an important part of global energy consumption, accounting for 32%, and building heating energy consumption accounts for 32-34% of the total energy consumption [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Energy-Saving and Ecological Renovation of Existing Urban Buildings in Severe Cold Areas: A Case Study

Liu,

Chen,

Wang

et al. 2023

Sustainability

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High-rise buildings in cold regions have a requirement of ecological improvement due to the continuous response to climate change throughout the year. This study evaluates wind environment, light environment, thermal environment, and energy consumption environment using Phoenics, Ecotect, and DesignBuilder tools, utilizing a high-rise residential building in an intensely cold place as an example. With the goal of repairing the buildings, green energy-saving measures are applied from the perspectives of form, structure, system, and equipment strategy. The energy-saving rates and carbon dioxide emission reduction rates of the renovated buildings were predicted. The results reveal that, in the building performance diagnostic, the wind speed clearly rise at the building’s corner, particularly on the outdoor level and the top floor; meanwhile, the inside lighting is insufficient, and there is a glare hazard adjacent to the window. The performance of the target building has unquestionably increased following the repair of 12 measures, including the bay windows, exterior walls, and solar energy. The influence of strong winds in winter and tranquil winds in summer greatly decreased in terms of the wind environment. In the light environment, indoor lighting is more uniform; the range of (Universal Design index) UDI100–2000 increased from 9.2% to 32.7%; and UDI2000, which may cause glare, decreased by 28.4%. Energy savings and pollution reduction rates were as high as 19.8% and 38.8%, respectively, due to the installation of solar photovoltaic panels. Based on all the measures, the overall energy saving rate of the target building was 63.8%, and the CO2 emission reduction rate was 90.3%.

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“…The use of such heat exchangers along with PCMs allows to achieve an energy efficiency of more than 70% [8]. The addition of fins can accelerate the melting process by almost 50% [13] which reduces the charging time, but also leads to the need to optimise the processes of manufacturing heat exchangers, taking the production costs into account [14,15], as well as the need to consider the critical geometric parameters of heat exchangers listed in [8].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Investigation of the Natural Convection Heat Transfer Coefficient in Phase Change Material (PCM) Based Fin-and-Tube Heat Exchanger

2021

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Latent heat thermal energy storage systems allow storing large amounts of energy in relatively small volumes. Phase change materials (PCMs) are used as a latent heat storage medium. However, low thermal conductivity of most PCMs results in long melting (charging) and solidification (discharging) processes. This study focuses on the PCM melting process in a fin-and-tube type copper heat exchanger. The aim of this study is to define analytically natural convection heat transfer coefficient and compare the results with experimental data. The study shows how the local heat transfer coefficient changes in different areas of the heat exchanger and how it is affected by the choice of characteristic length and boundary conditions. It has been determined that applying the calculation method of the natural convection occurring in the channel leads to results that are closer to the experiment. Using this method, the average values of the heat transfer coefficient (have) during the entire charging process was obtained 68 W/m2K, compared to the experimental result have = 61 W/m2K. This is beneficial in the predesign stage of PCM-based thermal energy storage units.

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Analysis of Possibilities to Use Phase Change Materials in Heat Exchangers-Accumulators

Cited by 6 publications

References 6 publications

Effect of Open and Closed Operation Modes on the Performance of Phase Change Material Based Copper Heat Exchanger

Effect of Open and Closed Operation Modes on the Performance of Phase Change Material Based Copper Heat Exchanger

Energy-Saving and Ecological Renovation of Existing Urban Buildings in Severe Cold Areas: A Case Study

Experimental and Theoretical Investigation of the Natural Convection Heat Transfer Coefficient in Phase Change Material (PCM) Based Fin-and-Tube Heat Exchanger

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