Adsorbent working pairs for solar thermal energy storage in buildings

Frazzica, Andrea; Freni, Angelo

doi:10.1016/j.renene.2016.09.047

Cited by 82 publications

(33 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Starting from the boundary conditions defined in the previous sections, the potential application of some adsorbent working pairs reported in the literature is analysed. In particular, the analysis is performed following the approach for the STES density calculation applied in [31], while the two most promising working pairs there reported, namely, MWCNT-LiCL and AQSOA Z02, with water as the working fluid are considered. The former one is a composite sorbent, using multi-wall carbon nanotubes (MWCNT) as a support matrix and LiCl as hygroscopic salt [23], while the latter one is a pure adsorbent material, belonging to the zeotype family [28].…”

Section: Potential Assessment Of Different Working Pairs For Stes Appmentioning

confidence: 99%

“…For instance, referring to Scenario 1, the energy density when 10% of the space heating needs are covered by the STES is up to 20% higher than the density achievable when 60% of the space heating needs are covered by the STES. The effect of this analysis is even more important when comparing the STES density that can be estimated with this proposed approach against the typical approaches reported in the literature [28,30,31], where, usually, fixed temperature boundary conditions are considered, regardless of the ambient temperature variability typical of each climatic zone. Indeed, considering, for instance, a constant T ads = 35 • C for providing space heating throughout the winter, when the STES coverage fraction is 60%, the evaluated density is underestimated in a range between 10% and 40%, depending on the working pair and scenario analysed.…”

Section: Potential Assessment Of Different Working Pairs For Stes Appmentioning

confidence: 99%

“…Such an approach brought to the wide variability of boundary conditions identified by different authors. Indeed, Frazzica and Freni [31] evaluated possible working pairs by varying different operating conditions, but, mostly, identifying 100 • C as the charging temperature coupled to 30 • C as the condensation temperature, with 50 • C as the adsorption temperature coupled to 10 • C as the evaporation temperature. Differently, Grekova et al [32] proposed the following operating conditions, 75-85 • C and 30 • C as the charging and condensation temperatures, respectively, 35 • C and 10 • C as the discharging and evaporation temperatures, respectively.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Unified Methodology to Identify the Potential Application of Seasonal Sorption Storage Technology

2020

Self Cite

View full text Add to dashboard Cite

In this study, the definition of a new methodology for a preliminary evaluation of the working boundary conditions under which a seasonal thermal energy storage (STES) system operates is described. The approach starts by considering the building features as well as the reference heating system in terms of solar thermal collectors’ technology, ambient heat sinks/source, and space heating distribution systems employed. Furthermore, it is based on a deep climatic analysis of the place where the STES needs to be installed, to identify both winter and summer operating conditions. In particular, the STES energy density is evaluated considering different space heating demands covered by the STES (ranging from 10% up to 60%). The obtained results demonstrate that this approach allows for the careful estimation of the achievable STES density, which is varies significantly both with the space heating coverage guaranteed by the STES as well as with the ambient heat source/sink that is employed in the system. This confirms the need for careful preliminary analysis to avoid the overestimation of the STES material volume. The proposed approach was then applied for different climatic conditions (e.g., Germany and Sweden) and the volume of one of the most attractive composite sorbent materials reported in the literature, i.e., multi-wall carbon nanotubes (MWCNT)-LiCl, using water as the working fluid, needed for covering the variable space heating demand in a Nearly Zero Energy Building (NZEB) was calculated. In the case of Swedish buildings, it ranges from about 3.5 m3 when 10% of the space heating demand is provided by the STES, up to 11.1 m3 when 30% of the space heating demand is provided by the STES.

show abstract

Section: Potential Assessment Of Different Working Pairs For Stes Appmentioning

confidence: 99%

Section: Potential Assessment Of Different Working Pairs For Stes Appmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Unified Methodology to Identify the Potential Application of Seasonal Sorption Storage Technology

2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Here, the energy density is an integrated heat from the initial discharging conditions, i.e., the temperature and pressure at the end of the discharging process. In some cases, the heat of adsorption is assumed constant, and thus, the energy density is calculated considering the uptake difference [47]. For low-pressure adsorption, the adsorbed phase density and nonideality are rather insignificant, whereas these factors must be considered in calculating the isosteric heat of adsorption.…”

Section: Selection Of Working Pairmentioning

confidence: 99%

Sorption-based Energy Storage Systems: A Review

Thu¹,

Nasruddin²,

Mitra³

et al. 2019

MST

View full text Add to dashboard Cite

Mismatched timing between the supply and demand of energy calls for reliable storage systems. Energy storage systems have become further significant with the widespread implementation of renewable energy. These systems can mitigate problems that are often associated with renewable energy sources such as supply unreliability while meeting the demand during peak hours. Energy can be stored in various forms, yet storage systems can be generally grouped based on their output forms, namely (i) electricity and (ii) heat or thermal energy. Electrical energy is the most convenient and effective form since it can power almost all modern devices. However, the electricity itself is vastly produced by thermodynamic cycles at a particular thermal efficiency using thermal energy from fossil fuels. Meanwhile, thermal energy for the HVAC&R and the production of hot water remains the largest portion of the building energy sector. Thermal energy can be stored in the form of sensible, latent, and thermochemical energy. This review focuses on thermochemical sorption-based energy storage systems. These systems exploit endothermic and exothermic sorption processes for charging and discharging of the thermal energy. Sorption-based storage systems exhibit huge potential due to a high energy density and their ability to store the energy at room temperature. We discuss the current state-of-the-art developments, key challenges, and future prospects of sorption-based energy systems.

show abstract

“…Heat is supplied and extracted via heat exchangers. Due to its favorable properties, many potential working pairs using water as the sorbate have been investigated, e.g., silica gel [4], zeolites [5,6], aluminum phosphates (AlPOs) [7], metal organic frameworks (MOFs) [8], activated carbon, and a variety of composites [4,7].…”

Section: Introductionmentioning

confidence: 99%

Closed Adsorption Heat Storage—A Life Cycle Assessment on Material and Component Levels

et al. 2018

View full text Add to dashboard Cite

Closed adsorption storages have been investigated in several projects for heat storage in building applications with focus on energy density and performance. This study complements this research with the assessment of the environmental impacts over the life cycle. Global warming potential (GWP) was chosen as the assessment criterion. Selected sorption materials in combination with water as the refrigerant were analyzed first by themselves and then embedded in a generic storage configuration. Sensible storage in water served as the reference benchmark. Results on material and component level showed that the relative storage capacity compared to water under realistic operating conditions reached values of below 4 and 2.5, respectively, in the best cases. Since the effort for producing the sorbents as well as the auxiliary material demand for assembling storage components was significantly higher than in the reference case, the specific environmental impact per storage capacity also turned out to be ~2.5 to ~100 times higher. We therefore suggest focusing sorption storage research on applications that (a) maximize the utilization of the uptake of sorbents, (b) do not compete with water storages, and (c) require minimal auxiliary parts.

show abstract

Adsorbent working pairs for solar thermal energy storage in buildings

Cited by 82 publications

References 25 publications

Unified Methodology to Identify the Potential Application of Seasonal Sorption Storage Technology

Unified Methodology to Identify the Potential Application of Seasonal Sorption Storage Technology

Sorption-based Energy Storage Systems: A Review

Closed Adsorption Heat Storage—A Life Cycle Assessment on Material and Component Levels

Contact Info

Product

Resources

About