Liquefaction Ratio Research Articles

Experimental study of breathable and heterogeneous phase change material (B&H-PCM) wall for all-season thermal performance enhancement

Physical parameters of existing building walls are relatively stable, making it difficult to meet the thermal requirements under different seasons. In this study, phase change materials (PCMs) with different thermal conductivities and melting points were adopted to form a breathable heterogeneous phase change material (B&H-PCM) wall to achieve the year-round heating and cooling load reduction. The effects of operation parameters on B&H-PCM and ventilated block (VB) wall were experimentally analyzed. As the hot air inlet temperature rose from 30 to 80 °C in winter, the heat storage capacity and liquefaction ratio continuously increased. The PCM heat storage rate was maximized at 50 °C with 26.7 %, and the liquefaction ratio of internal PCM was 100 % at 60 °C. As the air inlet velocity went up in winter/summer, the heat storage/dissipation capacity increased and the heat storage/dissipation rate changed oppositely. The maximum heat storage rate was 36 % at 0.5 m/s in winter, and the maximum heat dissipation rate was 58.7 % at 3 m/s in summer. The external/internal heat capacity and thermal resistance of B&H-PCM wall were 5.9/7.2 and 1.1/0.8 times of VB wall respectively, indicating that B&H-PCM wall had a better heat storage and resistance capacity both in winter and summer.

Impact of liquefaction ratio and cold energy recovery on liquefied natural gas production

The partial liquefaction of natural gas (NG) is commonly conducted in the liquefied natural gas (LNG) industry toward facilitating the use of non-liquefied gas for power generation and utility systems, while simultaneously achieving the desired heating value of LNG. This study investigated the impact of the partial liquefaction of NG and the recovery of cold energy from non-liquefied gas on the efficiency of the liquefaction process, in terms of specific work. The optimal liquefaction ratio (LR) with no recovery was 64.2% (778.7 kJ/kg LNG), which is 21.7% reduction of specific work in relation to that achieved through full liquefaction (995.0 kJ/kg LNG). The result showed a trade-off relationship between a higher LR to compensate energy consumption for cooling NG to its dew-point temperature with no liquid production and produce flash gas at a cryogenic temperature and lower LR to avoid the liquefaction of light components, which are difficult to condense. However, this trade-off resolved upon cold energy recovery, because there was no energy consumption until an LR of 8.1% could be achieved through an expansion of high-pressure NG feed by the recovery. For practical reason, a case study was conducted with lower bounds of the LR at 85%, 90%, and 95%. The findings of this study can guide the decision-making of future LNG projects for an optimal LR.

Agitation and its control on excess pore water pressure and debris‐flow behaviour

AbstractExcess water pressure strongly affects the rheology and flow behaviour of debris flows, and the mechanisms for development and persistence of the pressure can be diverse. Using nine experimental slurries prepared with the sediments collected from the deposit of a large‐magnitude debris flow by modifying maximum grain size and solid concentration, the influence of agitation on excess water pressure is investigated with a cylinder apparatus, consisting of a coaxially mounted bucket and impeller driven by a variable‐speed motor. Agitation proceeding in three dynamic stages raises relative excess water pressure (R) by 17%–34% of the peak R in the static stage, showing that agitation can significantly increase excess water pressure. The magnitude of the steady R increases with the level of agitation, which is measured by impeller speed and slurry temperature, and the steady R in a slurry is agitation‐level‐dependent below its potential maximum value. The transfer of particle weight to water in debris flows can occur under zero or very low to extremely low effective stresses. Agitation raises excess water pressure essentially by promoting dispersion of the finest‐grained grains in water and that of progressively larger grains in gradually coarser‐grained slurries. The flow resistance of the tested slurries, characterized by net torque exerted on the impeller by the motor, decreases with increasing liquefaction ratio, demonstrating that agitation enhances debris‐flow mobility by raising excess water pressure. It is of importance to dampen agitation by building proper mitigation measures in remedial practices.

Three-dimensional finite element analysis of the effect of soil liquefaction on the seismic response of a single pile

Soil liquefaction is considered as one of the most significant issues that leads to failure of shallow and deep foundations. However, the effect of liquefaction on the seismic response of piles still poorly understood. Therefore, this research examines the seismic response of a pile embedded in soil stratum of saturated fine-grained soils. Midas GTS/NX is used to carry out the number assessment. In addition, the modified UBCSAND soil constitutive model is used to depict the nonlinear features of saturated sand during earthquake waves. The developed three-dimensional model is first validated using the results of a shaking table test of a pile embedded in coarse-grained soil, where good agreement is obtained between the finite element model and the experimental results for the displacement, acceleration, and liquefaction ratio demonstrated good agreement. Furthermore, the orientations of the vectors produced by the numerical study, that matched a global circular flow characteristic, reflected the movement of the liquefied soil all around pile. The findings showed a considerable decrease in the pile frictional resistance during the seismic events as a consequence of increasing the pore water pressure and subsequent liquefaction. Regarding this, before the soil was entirely softened, resistance due to friction was observed near the ground, in correspondence with the loose sand layer. In addition, the pile showed excessive settling, which is due to the decrease of the soil stiffness caused by the increase of the pore water pressure. The results of this research provide an insight into the mechanism of the behavior of pile in saturated coarse-grained soils and thus, it helps to improve future research on the topic and also achieve better design of piles embedded in saturated coarse-grained soils.

Thermodynamic study on throttling process of Joule-Thomson cooler to improve helium liquefaction performance between 2 K and 4 K

The Joule-Thomson cooler (JTC) is a key component of the hybrid cryocooler dedicated to achieving and maintaining the operating temperature of around 2–4 K extensively used in quantum computing and communications. To clarify the energy conversion mechanism during the throttling process of the JTC and to improve throttling performance at 2–4 K, a numerical model is developed in which the effect of the complex real physical properties of liquid helium is considered, and the modified Lee phase change model is proposed to meet the operating conditions from supercritical to saturation. The results show that the phase change causes the cooling effect during the throttling process. The larger total energy loss in orifice leads to a higher liquefaction ratio. The liquefaction ratio increases with the increasing orifice thickness and the decreasing orifice diameter and inlet pressure. Given a constant inlet and refrigeration temperature difference, the liquefaction ratio increases with the increase of inlet temperatures. The maximum liquefaction ratio of 93.80% is achieved with orifice thickness of 0.8 mm, orifice diameter of 30 μm, and inlet pressure of 0.32 MPa, assuming an inlet temperature of 4 K and a refrigeration temperature of 3.43 K.

Investigation of Transcritical Carbon Dioxide Power Generation System Based on Vortex Tube

In this paper, a transcritical carbon dioxide power generation system based on a vortex tube is studied, which has the advantage of the self-condensation of carbon dioxide. The thermodynamic performance of the system was investigated by establishing a mathematical model. The results showed that under fundamental working conditions, the system could output a net power of 271.72 kW, and the thermal efficiency as well as the exergy efficiency of the system could reach 7.38% and 27.09%, respectively. Exergy analysis showed that the turbine had the greatest exergy loss among the system’s components, followed by the vortex tube, pump, heater and cooler. Parameter analysis showed that increasing the outlet pressure and inlet temperature of the vortex tube can improve the thermal efficiency and exergy efficiency of the system. In addition, the improvement in the turbine component’s efficiency is the most beneficial to the system’s performance, among which the turbine’s efficiency has the greatest impact. Carbon dioxide can be effectively liquified by expanding it in the vortex tube, and its liquefaction ratio increases with the decrease in the vortex tube’s inlet temperature and the increase in the vortex tube’s inlet pressure.

Comparative study on the globally optimal performance of cryogenic energy storage systems with different working media

Cryogenic energy storage (CES) has garnered attention as a large-scale electric energy storage technology for the storage and regulation of intermittent renewable electric energy in power networks. Nitrogen and argon can be found in the air, whereas methane is the primary component of natural gas, an important clean energy resource. Most research on CES focuses on liquid air energy storage (LAES), with its typical round-trip efficiency (RTE) being approximately 50% (theoretical). This study aims to explore the feasibility of using different gases as working media in CES systems, and consequently, to achieve a high system efficiency by constructing four steady-state process models for the CES systems with air, nitrogen, argon, and methane as working media using Aspen HYSYS. A combined single-parameter analysis and multi-parameter global optimization method was used for system optimization. Further, a group of key independent variables were analysed carefully to determine their reasonable ranges to achieve the ideal system performance, that is, RTE and liquefaction ratio through a single-parameter analysis. Consequently, a multi-parameter genetic algorithm was adopted to globally optimize the CES systems with different working media, and the energy and exergy analyses were conducted for the CES systems under their optimal conditions. The results indicated the high cycle efficiency of methane and a low irreversible loss in the liquefaction cycle. Moreover, the Joule-Thomson valve inlet temperature and charging and discharging pressures considerably affected the system performance. However, exergy loss in the CES system occurred primarily in the compressor, turbine, and liquefaction processes. The maximum optimal RTE of 55.84% was achieved in the liquid methane energy storage (LMES) system. Therefore, the LMES system is expected to exhibit potential for application in the CES technology to realize the integration of natural gas pipelines with renewable power grids on a large scale. Moreover, the results of study have important theoretical significance for the innovation of the CES technology.

Pore pressure evolution in bed sediment overridden by debris flow: A general formulation

AbstractDebris flows can grow dramatically in volume and mobility as they override bed sediment due to the reduction in bed friction resistance caused by high pore fluid pressure (PP). However, the mechanisms that control PP evolution in overridden bed sediment are still unclear. Here, a new mathematical model clarifies how diverse styles and magnitudes of PP evolution can result from regulation of the flow diffusion and shear contraction of bed sediment. Normalization of the model equations shows that the propensity for PP generation depends on timescales of PP diffusion and deformation of the bed grains. The PP of saturated bed sediment under immobile conditions is equal to the fluid pressure at the bottom of the flow due to a non‐flux basal boundary. However, the PP of unsaturated bed sediment is lower than that of the overlying flow. PP diffusion from a debris flow into an unsaturated bed increases with the bed’s permeability and water content. The shear deformation behavior changes from undrained to drained with increasing permeability or decreasing shear velocity of the saturated bed sediment, leading to a reduced magnitude of pore pressure. By contrast, the shear deformation transitions from drained to undrained behavior with increasing permeability and water content of unsaturated bed sediment. The entrainment rate and erosion pattern of bed sediment are closely related to the PP evolution and liquefaction ratio of the bed sediment due to Coulomb‐friction shear tractions. Our models can be used to interpret the feedback of PP on the flow momentum during debris flow entrainment.

Heterogeneous condensation mechanism of methane-hexane binary mixture

The condensation mechanism of alkanes is an essential foundation for improving the liquefaction efficiency of natural gas. However, a microscopic understanding of this mechanism is still lacking. This study analyzes the homogeneous and heterogeneous condensation characteristics of methane and explores the influence mechanisms of n-hexane molecules. The results reveal that higher initial pressures cause more intense nucleation stages with more latent heat released. Moreover, changes in the monomer temperature lag behind changes in cluster temperature, which is particularly pronounced in low supersaturation systems. Trace amounts of n-hexane can greatly improve the nucleation rate and liquefaction ratio of methane. The pre-condensed n-hexane clusters serve as a surface for heterogeneous methane nucleation, lowering the nucleation barrier significantly. As the number of n-hexane molecules increases, the nucleation promotion effect is further enhanced. With increased subcooling, the promotion effect lg (J/J0) drops from 17 to approximately 2. Furthermore, the heterogeneous condensation of n-hexane and methane mixture comprises three processes: n-hexane condensation with methane molecular adhesion, methane aggregation on n-hexane nuclei, and surface growth of methane clusters accompanied by n-hexane dissolution. Moreover, methane with lower surface tension always dominates in the cluster surface region.

Optimization of a cryogenic liquid air energy storage system and its optimal thermodynamic performance

For grid-scale intermittent electricity storage, liquid air energy storage (LAES) is considered to be one of the most promising technologies for storing renewable energy. In this study, a steady-state process model was developed for an LAES, by combining a Linde liquefaction process and an open Rankine power cycle. To investigate the system performance and achieve global optimization, a single-factor analysis approach and multifactor genetic algorithm (GA) optimization model were built using MATLAB software. The effects of the charging pressure, storage pressure, discharging pressure, and isentropic efficiency of the compressor/turbine on the LAES performance parameters, such as the inlet temperature of the Joule–Thomson valve, round-trip efficiency (RTE), liquefaction ratio (LR), and power consumptions in the compressor, cryo-pump, and turbine, were investigated. Subsequently, the optimal conditions were obtained using the GA optimization method to achieve the optimal performance of the LAES. The results showed that the charging pressure, discharging pressure, and isentropic efficiencies of the compressor and turbine had significant effects on the RTE; an increase in the discharging pressure resulted in an improved expansion power output; the GA optimization could achieve RTE, LR, the system energy storage and recovery exergy efficiencies of 53.33%, 86.96%, 81.00%, and 78.16%; the power consumption in the compressor of GA optimization was 10.02% maximum saving. The proposed optimization method can be used to further explore the global optimization of cryogenic energy storage systems, such as different-layout LAES systems and different cryogenic liquefaction media energy storage systems.

Model for analyzing the energy efficiency of hydrogen liquefaction process considering the variation of hydrogen liquefaction ratio and precooling temperature

The energy efficiency of the hydrogen liquefaction process is studied, and a general model of the hydrogen liquefaction process is built for analyzing the energy efficiency and the influence of multiple parameters. Energy and exergy analysis models of the typical single-pass cycle and multiple-pass cycle are developed. The specific relationships among the parameters and energy efficiency of the total liquefaction system are deduced. A hydrogen liquefaction process with precooling nitrogen and cryogenic helium cycles is studied. For the precooling and cryogenic cycles, the SEC and net power consumption of the cryogenic helium cycle have different variation trends along with the precooling temperature and hydrogen liquefaction ratio. Their optimal values are identified to be −194 °C and 0.9453, and the corresponding SEC, exergy efficiency, total capital expense, and total annual cost are 3.619 kWh/kgLH2, 33.44%, 82.58%, 8.263 M$, and 531.62 M$/yr, respectively. The proposed model can be used in the design and operation stages to analyze the variation of energy efficiency along with multiple parameters of the hydrogen liquefaction process.

The effect of model scale, acceleration history, and soil condition on closed-ended pipe pile response under coupled static-dynamic loads

This paper analyzes the effect of scaling-up model and acceleration history on seismic response of closed-ended pipe pile using a finite element modeling approach and the findings of 1g shaking table tests of a pile embedded in dry and saturated soils. A number of scaling laws were used to create the numerical modeling according to the data obtained from 1g shake table tests performed in the laboratory. The current study found that the behaviors of the scaled models, in general have similar trends. From numerical modeling on both the dry and saturated sands, the normalized lateral displacement, bending moment, and vertical displacement of piles with scale factors of 2 and 35 are less than those of the pile with a scale factor of 1 and the shaking table test. In general, the pile deformation factor was higher in saturated sand models than the dry sand models. Liquefaction ratios were increased by increasing the seismic intensity; hence the maximum liquefaction ratio was observed with the model of scale 1 under the effect of the Kobe earthquake (0.82g). In another full-scale model, the liquefaction ratio decreased significantly; i.e., it was decreased from 1.64% (λ=1) to 1.04% (λ=35) in the same mentioned model. Pile frictional resistance was numerically investigated and the overall results were compared with previous studies in the literature. In general, the frictional resistance at the pile tip was slightly higher than the frictional resistance around the pile body, and the frictional resistance factor on the ground surface of dry soil models was slightly higher than those of saturated soil models.

Polyurethane foam from grape-seed-based polyol

Grape seeds are abundant in the wine production process. Liquefying them into polyether polyols has been proved a suitable utilization route. Although grape seeds can be liquefied without fractionation, different components have different properties, which might ultimately affect the properties of the polyether polyol. In this study, grape seeds were fractionated by different pretreatment methods. The obtained components or residues were used to synthesize polyether polyols, which were subsequently used for polyurethane foam (PUF) synthesis. The key properties of the PUF were investigated. The results showed that grape seed lignin-based polyols distinctively improved the thermal stability of PUF and increased its density. However, there was almost no difference in the liquefaction ratio between whole grape seeds and their components. This implies that grape seed could be liquefied without fractionation to reduce production costs unless special requirements such as thermal stability are required.

Study on the energy efficiency of bioethanol-based liquid hydrogen production process

A hydrogen liquefaction process combined with bioethanol producing hydrogen process and multistage compressor process is designed, simulated and analyzed. Its specific energy consumption (SEC) and coefficient of performance (COP) are 5.41 kWh/kgLH2 and 22.38%, respectively, and the functional exergy efficiency is 71.13% for entire process and 53.61% for the hydrogen liquefaction process. The systematic relationship among hydrogen liquefaction ratio, SEC, COP and functional exergy efficiency of nitrogen precooling cycle, helium cryogenic cycle and whole process are deduced and analyzed. The results show that the process's performance improves with the hydrogen liquefaction ratio, and the variation trends of SEC, COP and functional exergy efficiency change significantly. The optimal hydrogen liquefaction ratio is 0.89, and the corresponding SEC is 4.71 kWh/kgLH2, reduced by 12.94%, the COP and functional exergy efficiency are 25.70% and 81.70%, and the general exergy efficiency is 43.60%.

Impact dynamics of debris flow against rigid obstacle in laboratory experiments

Debris-flow impact against rigid obstacle involves instant redirection of flow velocity and elevation of flow depth, and could serve as a stringent approach for verification of the two-phase flow models. In this study, kinetic and dynamic behavior of debris-flow impact with varying flow regime has been analyzed on the basis of laboratory tests with distributed measurement. Debris flows interact with obstacle in the modes of vertical jet (deflected vertically) and momentum jump (reflected upstream). The experimental results are further adopted to verify the predictability of vertical jet model and momentum jump model. Our findings highlight that, due to the elevated confining stress in the impact area, the liquefaction ratio increases, resulting in a more “fluid-like” state of debris flow. The two analytical models could distinguish the runup height around the threshold Froude number 3–4. However, the impact loads under both modes could be very close, because the effective impact in the vertical jet mode only concentrates in the lower portion of runup height. The potential threat of flip-through impact (shock impact by a steep or concave wave front) should also be considered, as its impulse load could be much higher than the predicted load by vertical jet and momentum jump models.

Porcine Acellular Dermal Matrix Increases Fat Survival Rate after Fat Grafting in Nude Mice

BackgroundAutologous fat grafts have been widely in use for reconstruction, contour abnormalities, and cosmetic surgeries. However, the grafted fat one-year survival rate is unpredictable and always low (20%–80%). Standardizing the existing transplantation technology is difficult due to the limiting conditions. Scaffold materials or drugs are unsuitable to employ because of legal restrictions, complex production, and undetermined hazards. Therefore, a simpler and more effective approach to improve grafted fat survival rate is using commercial products as additives. Earlier studies proved that porcine acellular dermal matrix (PADM), a biomaterial clinically used for wound repair, could work as a scaffold for lipo-implantation. This study aimed at investigating the hitherto unclear effect of PADM on transplanted fat survival.MethodsThirty-two 8-week-old female nude mice were divided into two groups. Control mice received a 300 μl fat injection, while the PADM group mice were injected with a 300 μl PADM-fat mixture. After a 4-week treatment, fat weight and liquefaction ratio were assessed. Histological changes were quantified via hematoxylin & eosin (H&E) staining. Macrophage infiltration and vascular regeneration were revealed using an anti-CD34 antibody. Mouse and human mRNA expression levels were gauged via RNA-sequencing. On the third day post implantation, the mRNA expression levels of inflammatory genes Mcp-1 and Tnf-α were measured by qRT-PCR.ResultsThe weight of surviving grafted fat did not differ between the control and the PADM group. However, adding PADM significantly decreased fat liquefaction. H&E-stained sections showed that PADM decreased fat necrosis, increased fat tissue regeneration, and raised CD34 levels in the regenerated tissue. RNA-sequencing showed that, compared to controls, fats from PADM-added group expressed more mouse-related mRNA but less human-related mRNA. The following GO and KEGG analysis showed that added PADM increased extracellular matrix (ECM) genes expression levels. The qRT-PCR showed that adding PADM increased Mcp-1 and Tnf-α mRNA expression levels.ConclusionsIn summary, PADM addition increased fat survival rate by reducing fat liquefaction through an increased macrophage infiltration, ECM regeneration, and revascularization. Therefore, PADM addition is a workable application in autologous fat grafting.No Level AssignedThis journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266.

Using a magnesia binder to improve the airproof performance of molded composites

Introduction. Water resistance is one of durability criteria of building materials. As a rule, the value of the liquefaction ratio is applied to assess the water resistance. However, even water resistant materials are not always able to withstand cyclical weather impacts that cause linear deformations, reduced strength and cause destruction of building products. Therefore, it is necessary to take into account the resistance of building materials, namely, their resistance to alternating humidification and drying (airproof performance). The purpose of this research is to study the producibility of molded composites containing a modified magnesium binder that features higher resistance to weather impacts.
 Materials and methods. The magnesium binder was modified by the silica fume and high pressure molding to increase the water resistance and airproof performance of the composites. The influence produced by the modifier on the change in the compressive strength of dried and water-saturated molded composites, liquefaction and airproof performance ratios, as well as linear deformations of the reference specimens were studied following a pre-set number of cycles of alternating wetting and drying.
 Results. The water resistance and airproof performance of construction products, containing magnesia binders, may be improved by the micro-silica, added to pressed mixtures, and their compaction by press molding. Compositions of molded composites, containing a modified magnesia binder, were developed for the manufacture of products used to make enclosing structures and for the flooring of rooms having the indoor humidity of over 60 %.
 Conclusions. It is established that molded composites containing a modified magnesia binder feature high resistance to alternating wetting and drying. The proposed method of modifying magnesia binders prevents the destruction of molded stone-like materials containing these binders in case of exposure to alternating stresses; it reduces linear deformations and, as a result, decelerates the fatigue failure. The use of a recyclable material as a mineral additive must contribute to the reduction of the cost of products and allow to consider the method of their production as one of the best technologies available.

Hydrogenolysis of organosolv hydrolyzed lignin over high-dispersion Ni/Al-SBA-15 catalysts for phenolic monomers

Efficiency and recycling of catalysts are important for the lignin hydrogenolysis to obtain phenolic monomers. In this work, a series of high-dispersion Ni/Al-SBA-15 catalysts were prepared by a direct and effective preparation method, and then used in the hydrogenolysis of diphenyl ether (DE) and organosolv hydrolyzed lignin (OHL) for phenolic monomers. The universality of as-made catalysts in different solvents and cyclic performance were investigated. Results showed that the addition of ethylene glycol (EG) during the loading process of Ni promoted the dispersion of metal efficiently. High dispersion of Ni species could highly enhance the conversion of DE and the OHL which Ni/Al-SBA-15(1EG) exhibited the excellent catalytic performance. Decalin was found to be most effective solvent on the conversion of DE (99.16%). 84.77% liquefaction ratio and 21.36% monomer yield were achieved, and no obvious char was observed after the depolymerization of OHL in ethanol solvent at 280 °C for 4 h over the Ni/Al-SBA-15(1EG) catalyst.

Transmission characteristics of exergy for novel compressed air energy storage systems-from compression and expansion sections to the whole system

Exergy flow characteristics of novel compressed air energy storage (CAES) is significant to evaluate CAES performance while few literatures have addressed this topic. The exergy flow characteristics of two cutting edge CAES systems, compressed air energy storage systems with thermal energy storage (TS-CAES) and supercritical compressed air energy storage (SC-CAES) systems are studied in this paper. All processes of the two systems are modeled (compression section, expansion section, air storage section for TS-CAES and cold storage/liquefaction section for SC-CAES) based on the commonness of the two systems. Exergy is decomposed into thermal and mechanical exergy for their different flow directions and characteristics. Thus, a general exergy flow model for the two systems was established. With the general model, the variations of the relevant proportional ratios and exergy transfer efficiencies with key parameters are revealed. Meanwhile, the energy coupling mechanism for the two systems are explored as well. For TS-CAES systems, except for the number of parts, the variation of each parameter only dominates the change of exergy transfer efficiency of a certain term or some two. All the variables except the pressure loss coefficient of the intercooler and the polytropic efficiency of the compressor, have large effect on the thermal exergy transfer efficiency of their respective flow section. For SC-CAES systems, with the increase of energy storage/release pressure, the system efficiency increases first and then decreases, which is due to change of liquefaction ratio.

Thermodynamic analysis of hybrid liquid air energy storage systems based on cascaded storage and effective utilization of compression heat

As a promising solution for large-scale energy storage, liquid air energy storage (LAES) has unique advantages of high energy storage density and no geographical constraint. In baseline LAES, the compression heat is surplus because of the low liquefaction ratio, which significantly influences its round-trip efficiency (RTE). In this paper, hybrid LAES systems based on the cascaded storage and effective utilization of compression heat is proposed and analyzed. In order to improve the storage temperature, cascaded-storage of compression heat is proposed. Meanwhile, the organic Rankine cycle (ORC) and Kalina cycle (KC) are considered to utilize the surplus compression heat to generate additional electricity. Based on the same conditions, the performances of the subcritical ORC using dry fluids, supercritical ORC using wet fluids, and KC are calculated and compared. It is found that the cascaded storage of compression heat can significantly increase the storage temperature and further improve the RTE of the system. Moreover, the RTE of the LAES system is increased by 10.9–19.5% owing to the additional power generation. The subcritical ORC using dry fluids is found to be more suitable in utilizing the surplus compression heat for its simple configuration and excellent performance.