Finned double-tube PCM system as a waste heat storage

Alhamdo, Mohammed H.; Theeb, Maathe A.; Golam, Ali S.

doi:10.1088/1757-899x/95/1/012033

Cited by 4 publications

(5 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[73][74][75][76] In this study, a PCM is used to capture the waste heat ejected from the condenser of an air conditioning unit and heat incoming cold water. Analysis is focused on using the finned tube heat exchanger to capture the waste heat, with different variations.…”

Section: Reference Overview Results/conclusionmentioning

confidence: 99%

A Key Review of Non-Industrial Greywater Heat Harnessing

2018

View full text Add to dashboard Cite

Abstract:The ever-growing concerns about making buildings more energy efficient and increasing the share of renewable energy used in them, has led to the development of ultra-low carbon buildings or passive houses. However, a huge potential still exists to lower the hot water energy demand, especially by harnessing heat from waste water exiting these buildings. Reusing this heat makes buildings more energy-efficient and this source is considered as a third-generation renewable energy technology, both factors conforming to energy policies throughout the world. Based on several theoretical and experimental studies, the potential to harness non-industrial waste water is quite high.As an estimate about 3.5 kWh of energy, per person per day could be harnessed and used directly, in many applications. A promising example of such an application, are low temperature fourth generation District Heating grids, with decentralized sources of heat. At the moment, heat exchangers and heat pumps are the only viable options to harness non-industrial waste heat. Both are used at different scales and levels of the waste-water treatment hierarchical pyramid. Apart from several unfavourable characteristics of these technologies, the associated exergetic efficiencies are low, in the range of 20-50%, even when cascaded combinations of both are used. To tackle these shortcomings, several promising trends and technologies are in the pipeline, to scavenge this small-scale source of heat to a large-scale benefit.

show abstract

Section: Reference Overview Results/conclusionmentioning

confidence: 99%

A Key Review of Non-Industrial Greywater Heat Harnessing

2018

View full text Add to dashboard Cite

show abstract

“…Several researchers [176]- [185], [186]- [189] have tested numerically and experimentally double-pipe LHTES systems. A double tube LHTES with RT82 as PCM with the dispersion of graphene quantum dot and single-walled carbon nanotubes were studied numerically with Ansys Fluent [176].…”

Section: Numerical and Experimental Studies Of Double-pipe Lhtes Systemsmentioning

confidence: 99%

“…The melting and solidification time duration was decreased by 50% with a stored energy of 30% in a melting fraction equal to 0.75 [184]. The effect of fins arrangement in a double tube LHTES was investigated in [185]- [189]. Wavy fins of 2mm amplitude and 1mm wavelength lead to a reduction of 43.49% and 17.81% for charging and discharging processes [185], [186].…”

Section: Numerical and Experimental Studies Of Double-pipe Lhtes Systemsmentioning

confidence: 99%

“…The effect of fin type and orientation was analyzed in a CFD simulation study and the transversal corrugated fin arrangement resulted in shorter melting/solidification times [188]. A double tube LHTES with paraffin wax as PCM with different fins arrangements (no fins, longitudinal fins, spiral fins, circular fins) was developed and tested experimentally as a waste heat recovery system [189]. In horizontal position, the double tube with longitudinal fins and without fins performed better; in vertical position, the double tube with spiral and circular fins showed an improved performance [189].…”

Section: Numerical and Experimental Studies Of Double-pipe Lhtes Systemsmentioning

confidence: 99%

“…A double tube LHTES with paraffin wax as PCM with different fins arrangements (no fins, longitudinal fins, spiral fins, circular fins) was developed and tested experimentally as a waste heat recovery system [189]. In horizontal position, the double tube with longitudinal fins and without fins performed better; in vertical position, the double tube with spiral and circular fins showed an improved performance [189]. presents the results of the numerical analysis conducted on the double-pipe LHTES system.…”

Section: Numerical and Experimental Studies Of Double-pipe Lhtes Systemsmentioning

confidence: 99%

See 2 more Smart Citations

Microencapsulated Phase Change Materials for Thermal Energy Storage in Buildings: Design, Characterization and Modelling

Paroutoglou

View full text Add to dashboard Cite

Thermal energy storage (TES) has a significant role in saving thermal energy and improving indoor climate. Latent heat thermal energy storage (LHTES) using Phase Change Materials (PCM) in heating, ventilation, and air-conditioning (HVAC) building applications allows storage of a substantial amount of energy in a relatively small volume and absorbs/releases it in a narrow temperature range. The main objective of the current study was to develop and thermally characterize microencapsulated PCM for LHTES in building applications. The microencapsulated PCM stores substantial energy, and leakage or phase separation is avoided compared to PCM in bulk and PCM emulsions. In the current thesis, seven PCM belonging to the categories of organic paraffins, organic non-paraffins, and inorganic salts were thermally characterized. Additionally, this study presents the development of PCM emulsions, PCM polymers, and PCM electrospun fiber matrices. All variations of PCM emulsions, polymer, and electrospun fibers were characterized thermally and morphologically. Commercial organic paraffin RT18™ with a melting temperature of 18°C in bulk, emulsion, and electrospun fiber forms was found suitable for application in LHTES systems in HVAC building applications. Bulk RT18™ showed latent heats of melting/solidification of 137-139 kJ/kg, while RT18™ water emulsion possessed latent heats of about 180 kJ/kg. PCM core-PCL shell electrospun fibers of organic paraffin RT18™ showed latent heats of melting solidification of 102.1/82.21 kJ/kg. Additionally, after conducting experimental studies on PCM, a numerical analysis of LHTES systems of different geometries was carried out using Comsol Multiphysics 6.0 FEM software. The effect of internal and external fins in a double tube encapsulating bulk PCM in the annular space was studied. Additionally, a singletube LHTES using PCM electrospun fiber matrix in direct contact with water was analyzed. The phase change processes were accelerated with an increase in the length of fins.

show abstract

A review of phase change materials in multi-designed tubes and buildings: Testing methods, applications, and heat transfer enhancement

Saha

Ahmed

et al. 2023

Journal of Energy Storage

View full text Add to dashboard Cite

Finned double-tube PCM system as a waste heat storage

Cited by 4 publications

References 2 publications

A Key Review of Non-Industrial Greywater Heat Harnessing

A Key Review of Non-Industrial Greywater Heat Harnessing

Microencapsulated Phase Change Materials for Thermal Energy Storage in Buildings: Design, Characterization and Modelling

A review of phase change materials in multi-designed tubes and buildings: Testing methods, applications, and heat transfer enhancement

Contact Info

Product

Resources

About