Thermal characteristics and energy saving of charging/discharging processes of PCM in air free cooling with minimal temperature differences

Nada, S.A.; Alshaer, W.G.; Saleh, Ramy M.

doi:10.1016/j.aej.2019.10.002

Cited by 26 publications

(5 citation statements)

References 42 publications

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“…(Socaciu et al, 2016). It is an emergent research area, attracting scholars to testing new types of PCM to reach optimal thermal comfort conditions by incorporating them into building envelopes (Evola, Marletta and Sicurella, 2013b;Sage-Lauck and Sailor, 2014;Jamil et al, 2016b;Nghana and Tariku, 2016;Figueiredo et al, 2017b;Afolabi et al, 2019;Ahangari and Maerefat, 2019;Alizadeh and Sadrameli, 2019;Nada, Alshaer and Saleh, 2019;Bagheri-Esfeh, Safikhani and Motahar, 2020;Kerroumi, Touati and Virgone, 2020;Ye, Wang and Qian, 2020;Yun et al, 2020;Al-Absi et al, 2021;Ortega Del Rosario et al, 2021;Y. Qu et al, 2021b;Zhu et al, 2021).…”

Section: Phase Change Materials (Pcm)mentioning

confidence: 99%

Thermal Comfort in Buildings: Scientometric Analysis and Systematic Review

et al. 2023

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The building sector is one of the most resource-exhausting areas in global energy consumption. Maintaining good thermal comfort for occupants is the leading energy demand in buildings. The primary purpose of the current study is to identify the development of research areas on occupant comfort, pinpoint the gaps in knowledge and recommend directions for future studies. A scientometric analysis and a comprehensive systematic literature review are conducted using 792 sources. It is evident from the exponential increase in published papers that scholars are highly interested in this research topic. However, discrepancies remain between the two fundamental models of evaluating thermal comfort. There is a pressing need to balance thermal comfort while increasing energy efficiency. The foundation of achieving this balance can only be done by correctly evaluating the surrounding environment of occupants and understanding all the factors influencing human thermal comfort conditions. There is also a high potential in employing industry 4.0 technologies to assist in designing more innovative solutions for thermal comfort. Furthermore, there is a need for local thermal standards targeting specific regions. The lack of interoperability between BIM 3D modelling and energy simulation tools remains an obstacle.

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Section: Phase Change Materials (Pcm)mentioning

confidence: 99%

Thermal Comfort in Buildings: Scientometric Analysis and Systematic Review

et al. 2023

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“…The air duct illustrated in Figure 1 is thermally insulated, thus, it is assumed that there is no heat loss from the duct to the surrounding air. Based on the energy balance between the hot air in the duct and PCM1 during the charging cycle (melting process), the energy released by the air and gained by PCM1 can be expressed as follows [8]:…”

Section: Charging and Discharging Of Pcm Analysismentioning

confidence: 99%

“…Significant improvements in PCM performance were observed in these works. Nada et al [8] experimentally investigated the free air cooling performance using PCM filled in plate containers during charging and discharging cycles. The required number of PCM plates, energy saving, air flow rate, and outdoor temperature were investigated.…”

Section: Introductionmentioning

confidence: 99%

Energy Saving and Charging Discharging Characteristics of Multiple PCMs Subjected to Internal Air Flow

Hamad

2021

Fluids

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One essential utilization of phase change materials as energy storage materials is energy saving and temperature control in air conditioning and indirect solar air drying systems. This study presents an experimental investigation evaluating the characteristics and energy savings of multiple phase change materials subjected to internal flow in an air heating system during charging and discharging cycles. The experimental tests were conducted using a test rig consisting of two main parts, an air supply duct and a room model equipped with phase change materials (PCMs) placed in rectangular aluminum panels. Analysis of the results was based on three test cases: PCM1 (Paraffin wax) placed in the air duct was used alone in the first case; PCM2 (RT–42) placed in the room model was used alone in the second case; and in the third case, the two PCMs (PCM1 and PCM2) were used at the same time. The results revealed a significant improvement in the energy savings and room model temperature control for the air heating system incorporated with multiple PCMs compared with that of a single PCM. Complete melting during the charging cycle occurred at temperatures in the range of 57–60 °C for PCM1 and 38–43 °C for PCM2, respectively, thereby validating the reported PCMs’ melting–solidification results. Multiple PCMs maintained the room air temperature at the desired range of 35–45.2 °C in the air heating applications by minimizing the air temperature fluctuations. The augmentation in discharging time and improvement in the room model temperature using multiple PCMs were about 28.4% higher than those without the use of PCMs. The total energy saving using two PCMs was higher by about 29.5% and 46.7% compared with the use of PCM1 and PCM2, respectively. It can be concluded that multiple PCMs have revealed higher energy savings and thermal stability for the air heating system considered in the current study.

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“…Temperature and pressure sensors readings are acquired and recorded using data acquisition system (National instrument NI CDAQ‐9178). More information about the experimental set up and measurements techniques and errors can be found in Nada et al 30,31 …”

Section: Materials and Proceduresmentioning

confidence: 99%

Segregation/cycling effects on thermophysical properties of salt hydrate phase change materials

2021

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Energy storage systems designers normally use the thermophysical properties of phase change materials (PCMs) from the manufactures/suppliers data sheet. Unfortunately, sometimes PCMs systems do not behalf according to supplier data sheet, especially after cycling use. Designing systems based on these unrealistic data sheet make the system operates at off design conditions most of time. The problem is substantially appears in salt hydrates PCMs systems. In this short communication, a case study of such discrepancies in air free cooling is addressed. The system design was based on SP24E PCM data sheet, but results showed that liquids and solidus lines cannot shown on the temperature transient history during charging and discharging process, and complete solidification and melting could not be obtained. For further detailed investigations; differential scanning calorimeter (DSC) tests were conducted for SP24E PCM and completely different results than supplier data sheet were obtained DSC tests showed (a) a wide range of temperature variation during melting and solidifications, (b) phase change starts and ends at lower temperatures compared with supplier data sheet, and (c) phase change latent heat is lower than the one listed in supplier data sheet.

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Thermal characteristics and energy saving of charging/discharging processes of PCM in air free cooling with minimal temperature differences

Cited by 26 publications

References 42 publications

Thermal Comfort in Buildings: Scientometric Analysis and Systematic Review

Thermal Comfort in Buildings: Scientometric Analysis and Systematic Review

Energy Saving and Charging Discharging Characteristics of Multiple PCMs Subjected to Internal Air Flow

Segregation/cycling effects on thermophysical properties of salt hydrate phase change materials

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