Performance Characteristics Of Devices Research Articles

Influence of different head and neck positions on performance characteristics of second generation supraglottic airway devices

BackgroundVarious head and neck positions alter the performance of supraglottic airway devices (SAD). We compared the influence of flexion, extension, neutral and rotation of the neck on performance characteristics of second generation airway devices namely Proseal (PLMA), i-gel and Auragain laryngeal mask. MethodsThis study was conducted in 90 ASA physical status I and II patients 18–65 years of age. Patients were randomised into three groups with 30 patients in each: PLMA, i-gel and Auragain. The primary objective was to compare oropharyngeal leak pressure (OPLP) among PLMA, i-gel and Auragain in neutral, flexion, extension and lateral rotation of the neck. The secondary objective was to compare Peak inspiratory pressure (PIP), ventilation score, expired tidal volume, fiberoptic grading of laryngeal view, end tidal carbon dioxide and OPLP-PIP difference. ResultsPLMA, i-gel and Auragain have the highest OPLP in flexion (34.4 ± 2.5, 31.6 ± 2.3, 32.8 ± 1.7) followed by neutral, left lateral rotation and lowest in extension (26.7 ± 1.6, 25.4 ± 3.19, 29.6 ± 1.0) respectively. PLMA and Auragain have significantly higher OPLP when compared to i-gel in all positions p < 0.05. In extension, OPLP with Auragain (29.6 + 1.0) was significantly higher than PLMA (26.7 + 1.6) and i-gel (25.4 + 3.1), p < 0.001. PIP was significantly higher in flexion position for all the three devices. No significant difference in fibre optic grading and ventilation score was seen for three devices in various neck positions. ConclusionsPLMA and Auragain have better sealing pressure than i-gel in all the positions. Flexion position during surgery is best for maintaining OPLP. Auragain should be preferred over PLMA and i-gel in surgeries involving extension of neck.

Design and fabrication of an opto-mechanical antenna in the NIR range

In this study we present a novel device for the direct transduction of optical radiation in the near-infrared region into mechanical actuation, which is based on a plasmonic optical nanoantenna integrated in a microcantilever. We propose and demonstrate the feasibility of a simple fabrication process consisting in the nano-tailoring of a commercially available Atomic Force Microscope (AFM) cantilever by means of the Focused Ion Beam (FIB) milling technique. Furthermore, the comprehensive analysis of the device performance characteristics included in this work reveals the different sensitivity values of these characteristics to the fabrication process tolerances of the most relevant geometric design parameters.

RECEIVING METALS FROM SECONDARY RAW MATERIALS. POWDER OF SILVER

Purpose of research. Powder of silver is one of the most widely used materials in industry. In the free or sintered (compressed) state, it is widely used in medicine as an element of antiseptics, in electronics as the basis of conductive pastes, conductive adhesives and contacts intended for closing and opening electrical circuits, in the production of multilayer ceramic capacitors, etc. Due to its high electrical conductivity, powder of silver is also used as a cathode material in solar cells. In today's conditions, the development of materials for alternative energy sources is quite relevant. Powder of silver can be used as a component of the active mass in chemical current sources. It is known that the characteristics of the active mass are influenced by the properties of the powder, namely, the size and shape of the particles. Materials and methodology. In this work, it was proposed to use boards of radio-electronic equipment as raw materials for the production of powders of silver. The reductant, recovery rate and modes of obtaining finely dispersed powders of silver after processing of secondary raw materials were identified. Results. The influence of the parameters of the reduction of powders of silver, namely, the type of reducing agent and the rate of reduction, was studied. It was established that in the process of forming powders of silver, a developed morphology and space between particles are formed, which increases the surface area, due to which the performance characteristics of various devices, in which powder of silver can be used as a component, will improve. Scientific novelty. Factors that affect the size and shape of powder of silver particles, namely, the type of reducing agent and the rate of reduction, have been established. Conclusions. It was established that the size of particles of silver depends on the speed of recovery. The stronger the reducing agent, the higher the rate of metal reduction, and the larger the particle size. Changing the speed of recovery (slowing down or speeding up) allows you to get particles of silver with the desired size. The indisputable advantage of the method of obtaining powder of silver by reduction is the formation of high-purity metal, which positively affects the properties.

Cooperative navigation of unmanned aerial vehicle formation with delayed measurement

Abstract This paper focused on the problem of positioning accuracy degradation caused by delayed measurement information in Unmanned Aerial Vehicle (UAV) formation cooperative navigation under complex environments such as cities and hills, and presented a non-synchronous compensation algorithm based on kinematic constraints and constructed a distributed cooperative navigation filter based on the analysis of the basic operating characteristics of inertial devices, satellite receivers, and ranging sensors. In the UAV formation, the leader-UAV is equipped with Real-Time Kinematic (RTK) differential equipment and airborne data link to construct the airborne reference beacons and provide cooperative navigation services for the wingmen-UAV. Firstly, the navigation filtering framework with inertial sensors as the core is established. Secondly, the non-synchronous compensation filter is constructed by using the kinematic constraint model, which compensates and corrects the non-synchronous air-based position of the leader-UAV, and reduces the effect of delayed measurement on the positioning error of the system. Then the fault diagnosis algorithm is utilized to complete the identification and rejection of abnormal range values in the case of Non-Line-of-Sight (NOLS). Finally, the navigation parameters are solved by the Kalman filter. Simulation results show that the non-synchronous compensated filtering proposed in this paper can improve the absolute positioning accuracy by 55%, which effectively improves the cooperative navigation performance and robustness under the presence of random time delay in the measurement information.

A theoretical investigation to boost the efficiency of CZTS solar cells using SCAPS-1D

Cu2ZnSnS4 (CZTS) is predicted to be an efficient absorber than CIGS due to its cost effective, earth inabundant constituents. But, it reached a maximum experimental efficiency of 12.6% in 2013 and it remains the same for the past decade. This is due to the various crystallographic factors that limit the performance of CZTS like antisite defect formation, unfavourable band alignment with n-type CdS, etc. The major objective of this article is to identify potential strategies through which CZTS research can be pursued further using Solar Cell Capacitance Simulator (SCAPS) 1D simulator. First, it deals with understanding the difference between CZTS and its derivatives Cu2ZnSnSe4 (CZTSe) and Cu2ZnSn(SxSe1−x)4 (CZTSSe). Then, in pursuit of finding an alternative to n-CdS, the performance of various n-type semiconductors is investigated. Later, bandgap-graded structures using exponential and linear gradient laws are constructed and the performance of such structures is evaluated. Cation-substituted CZTS structures like (Ag1−xCux)2ZnSn(SxSe1−x)4(ACZTSSe) and Cu2Cd1−xZnxSn(SxSe1−x)4 (CCZTSSe) are discussed and the performance characteristics of such devices are also studied.

Structure optimization and operation characteristics of metal gas storage device based on compressed air energy storage system

Compressed air energy storage (CAES) is a key technology for promoting the replacement of fossil fuels with renewable energy. Currently, CAES systems typically require an underground salt cavern, which is limited by geological and geographical conditions. To promote the rapid popularization of CAES, there is an urgent need to develop new gas storage devices with flexible layouts. Metal pressure vessel as a gas storage device is concerned with the benefits of high storage pressure and reliable operation. Considering both strength and fatigue, this study conducted a structural optimization of Tank-D2000 and Pipe-D400 to achieve the design operating life with the minimal quality. Furthermore, the optimized structure was used to study the operating characteristics of the gas storage device by the multi-domain fluid–solid thermal coupling method and the real gas model. The results indicated that the internal convective heat transfer coefficient of the gas storage device was a linear function of time during operation, whereas the external natural convective heat transfer coefficient almost remained constant. The pressure distribution was uniform; however, the temperature difference was large, particularly for D400. Analysis and prediction based on the theory of the polytropic process showed that the polytropic index of D400 was lower than that of D2000, so the heat transfer of D400 was more adequate and the effective capacity of gas storage device under the designed operating pressure range was larger. With an increase in flow, polytropic index increased and was lower at energy storage than at energy release. The pressure prediction error was basically within the range of ±4 %, and the temperature prediction error was within the range of ±3 %.

Optimization of Double-Gate Carbon Nanotube FET Characteristics for Short Channel Devices.

Transistors are the fundamental electronic component integrated into electronic devices' chips Carbon Nano Tube (CNT) based field. Effect Transistor (FET) is a promising component for next-generation transistor technologies; as it has high carrier mobility, device stability, and mechanical flexibility. Nevertheless, some shortcomings in the CNT FET's design prevent it from providing the best performance while preserving thermal stability. The structure and functionality of transistors with Double-Gate (DG) devices, which use carbon nanotubes as active channel regions, have been examined by the authors of this study. The DG CNT FET has been extensively simulated using an electronic device simulator with various device geometrics, including channel length, oxide thickness for its output, and transfer characteristics. In comparison to reported patents and published works, this demonstrates a significant improvement Conclusion: A new perspective on the DG CNT FET's device performance characteristics is provided by this research work, which can be scaled down to minimum channel length without Short Channel Effects (SCEs).

Performance Analysis of Multi-Channel-Multi-Gate-Based Junctionless Field Effect Transistor

In this paper, a multi-gate junctionless field-effect transistor with a quad gate and multiple channels has been proposed and thoroughly simulated. The proposed device offers a lower I off current of 4.34 × 10−19 A, an I on current of 4.17 × 10−06 A with an I on/I off current ratio of 9.65 × 1012, a threshold voltage of 0.86 V, a transconductance of 5 × 10−05 S, a drain-induced barrier lowering (DIBL) of 22 mV/V, and a subthreshold slope (SS) of 61.51 mV/dec. The visual contour plots of the device are also included in this study to understand the working mechanism. The larger tunneling width between the channel drain and barrier height between the source–channel interface exhibits a lower leakage current and better performance. The performance of the proposed device is also studied when the work function between the semiconductor and gate material is altered. The work function difference improves the performance metrics. Aside from that, the effects of temperature variation on the device's performance characteristics are also being studied. When the temperature varies by 33% the threshold voltage of the proposed device drops by only 7% which shows a minimum variation in the proposed device. The results obtained from the proposed device exhibit the potential of using multi-gate multi-channel junctionless field effect transistor (MCMG) device in low-power logic circuits and memory devices.

A Constant Properties Model for the Performance Estimation in Segmented Thermoelectric Generator Elements and Its Experimental Validation Using an n-Type Mg2Si0.3Sn0.7–Bi2Te2.7Se0.3 Segmented Leg

Segmenting multiple compatible thermoelectric (TE) materials can improve the conversion efficiency in thermoelectric generators (TEGs) compared to single-material TEGs. A model to accurately estimate the performance in segmented TEGs is essential for optimizing the geometric parameters. Constant properties models (CPMs) help in the quick estimation of the performance of TEGs working under large temperature differences using averaged material properties. This work discusses a CPM to predict the performance of single and segmented TEG elements using a combination of temperature-averaged and spatially-averaged TE properties. Spatial averaging requires the knowledge of the temperature profile across the TEG element length, which was obtained by solving the heat balance equation with a numerical integration approach as suggested by Ponnusamy et al. In this work, we develop the CPM for the segmented TEG elements (CPMS). The model predictions were validated experimentally from the performance evaluation of single Mg2(Si0.3Sn0.7)0.98Bi0.02 and segmented Mg2(Si0.3Sn0.7)0.98Bi0.02–Bi2(Te2.7Se0.3)0.98(CuI)0.02 TEG elements. Single and segmented TEG elements with Cu contacts were prepared by a hot-pressing technique. Both Mg2(Si0.3Sn0.7)0.98Bi0.02 and Bi2(Te2.7Se0.3)0.98(CuI)0.02 TE materials show peak zT > 1 in their measurement range. The experimental results show a maximum efficiency (ηmax) of ∼8.25% with 18% improvement for the segmented structure at ΔT ≈ 302 K. The improvement mainly originated from lower heat input (Qin) even though the maximum power output (Pmax) became lower by ∼30%. The performance prediction using the CPM matches well with <10% error for Pmax and ηmax for the single TEG element, and using the CPMS, the predictions were <10% error for Pmax and <25% error for ηmax for the segmented TEG element experimental results. This work demonstrates how CPMS can be used to predict device performance characteristics in segmented TEGs.

PWM-Current Source Converter Based on IGCT-in-Series for DC Buck and Constant-Current Application: Topology, Design, and Experiment

PWM-current source converter (CSC) based on IGCT-in-series has the advantages in efficiency, reliability, cost, and controllability. It is a promising choice to replace silicon-controlled rectifier in dc buck and constant-current application, as well as to use in power transmission. This article firstly presents the series-IGCT-based CSC topology according to the IGCT device and CSC operation characteristics. On the basis of traditional CSC topology, di&#x002F;dt-limitation inductor, absorption circuit and voltage sharing circuit are set. Secondly, the commutation process of series-IGCT-based CSC in each stage of one ac period is analyzed to obtain the coupling model between overvoltage on device and converter parameters. Furthermore, a prototype of 10kV, 1kA series-IGCT-based CSC for transmission line deicing is designed in both parameter and structure. Finally, pulse switching and power-cycling experiments of implemented prototype are carried out. The results verify that with designed parameters, overvoltage on devices is within a save range, and voltage unevenness among six units in series can be limited to 6.5&#x0025;. Moreover, the prototype shows stability and reliability during long-term power-cycle operation, definitely verifying the feasibility of proposed series-IGCT-based CSC. Compared with IGBT, loss power of IGCT scheme is more than 10&#x0025; lower, and reach the efficiency of 98.7&#x0025;.

Patient-Centered Clinical Trial Design for Heart Failure Devices via Bayesian Decision Analysis.

The statistical significance of clinical trial outcomes is generally interpreted quantitatively according to the same threshold of 2.5% (in one-sided tests) to control the false-positive rate or type I error, regardless of the burden of disease or patient preferences. The clinical significance of trial outcomes-including patient preferences-are also considered, but through qualitative means that may be challenging to reconcile with the statistical evidence. We aimed to apply Bayesian decision analysis to heart failure device studies to choose an optimal significance threshold that maximizes the expected utility to patients across both the null and alternative hypotheses, thereby allowing clinical significance to be incorporated into statistical decisions either in the trial design stage or in the post-trial interpretation stage. In this context, utility is a measure of how much well-being the approval decision for the treatment provides to the patient. We use the results from a discrete-choice experiment study focusing on heart failure patients' preferences, questioning respondents about their willingness to accept therapeutic risks in exchange for quantifiable benefits with alternative hypothetical medical device performance characteristics. These benefit-risk trade-off data allow us to estimate the loss in utility-from the patient perspective-of a false-positive or false-negative pivotal trial result. We compute the Bayesian decision analysis-optimal statistical significance threshold that maximizes the expected utility to heart failure patients for a hypothetical two-arm, fixed-sample, randomized controlled trial. An interactive Excel-based tool is provided that illustrates how the optimal statistical significance threshold changes as a function of patients' preferences for varying rates of false positives and false negatives, and as a function of assumed key parameters. In our baseline analysis, the Bayesian decision analysis-optimal significance threshold for a hypothetical two-arm randomized controlled trial with a fixed sample size of 600 patients per arm was 3.2%, with a statistical power of 83.2%. This result reflects the willingness of heart failure patients to bear additional risks of the investigational device in exchange for its probable benefits. However, for increased device-associated risks and for risk-averse subclasses of heart failure patients, Bayesian decision analysis-optimal significance thresholds may be smaller than 2.5%. A Bayesian decision analysis is a systematic, transparent, and repeatable process for combining clinical and statistical significance, explicitly incorporating burden of disease and patient preferences into the regulatory decision-making process.

Theoretical and Experimental Analysis of a Winding Rope Fluid Viscous Damper

This paper investigated a winding rope fluid viscous damper (WRFVD) that uses the frictional amplification mechanism of a winding rope to obtain the operating characteristics of a viscous damper-like device. The WRFVD combined the advantages of fluid viscous dampers and friction dampers. It not only retained the mechanical characteristics of the fluid viscous damper but also reduced manufacturing costs. First, the construction and working principles of the WRFVD were introduced. A theoretical model that could accurately simulate the hysteretic characteristics of the damper was derived. Then, a series of dynamic tests were performed on six prototypes of the WRFVD. The dynamic performance under different displacement amplitudes and device parameters was analyzed based on the test results. In addition, the theoretical model was validated by experimental results. Finally, a series of parametric analyses of the WRFVD were performed. The experimental results showed that the WRFVD is a type of velocity-dependent damper with smooth and plump hysteretic curves under sinusoidal displacement excitation. Fatigue loading tests showed that the WRFVD had excellent fatigue resistance capacity and stable operational performance. The established theoretical model was reasonable and satisfactorily reproduced the hysteretic properties of the WRFVD. The parametric analyses showed that it was not recommended to improve the performance of the WRFVD by the method of adjusting the damping coefficient and pretightening load. It was reasonable to adjust the performance of the WRFVD by setting a smaller velocity exponent, an appropriate winding turn of winding ropes, and a suitable friction coefficient.

Improving strong scalability of electronic structure simulations with reduced overhead of communications

Physically realizable semiconductor electronic devices easily include more than several million atoms even though they are in nanoscale, so electronic structure simulations of huge atomic systems are the key to predict performance characteristics of such devices. The empirical tight-binding (TB) model, which uses a finite set of localized bases for descriptions of a single atom with assumption of nearest-neighbor coupling, has been extensively adopted to solve electronic structures of large-scale atomic systems, and the size-capability of TB simulations has been continuously improved with aids of parallel computing. Recently, we have demonstrated a strong scalability of TB simulations up to 2,500 computing nodes for a model problem consisting of 400 million atoms, where the scalability is limited due to the overhead of collective communications that the core numerical method must involve to get a partial eigenspectrum of the sparse Hamiltonian system matrix. To reduce the cost of Message Passing Interface (MPI) communications and its effect on the end-to-end simulation time, here we design an equivalent transformation of the sparse matrix eigensolver, and employ a core dedicated to MPI communications with dynamic scheduling of threads. Through rigorous benchmark tests against model problems of various sizes, it is confirmed that our method improves the strong scalability of TB simulations by more than 10% in a huge computing environment, by reducing the time-cost of both core computations and collective communications.

In-situ 3He neutron spin filters at JCNS, status and updates

The JCNS has been developing and using in-situ polarized neutron spin filters for many applications. The system used for analysis on MARIA and polarization for TOPAS were completed about 10 years ago with the MARIA system in standard operation for users and the TOPAS system employed for a long measurement on the POLI instrument. In the meantime we are progressing on several new in-situ polarizers based on these first two but with additional innovations. The KWS-1 analyzer device which was recently used in tests at TU Delft and ISIS is essentially a 50%-sized copy of the MARIA device. The two devices in construction for polarization and analysis on POLI for hot neutrons feature magic-boxes with angled plates on both the entrance and exit sides to minimize overal length and the polarizer device will employ an additional passive magnetic shield of soft iron so that it can operate inside the stray field area of a 8-T vertical (compensated) sample magnet. We will summarize the current status of our 3He neutron spin filters and provide extra focus on the technical aspects and measured performance characteristics of the new devices for KWS-1 and POLI in particular.

A Comparative Analysis of the Energy Performance Characteristics of Turbine Condenser Evacuation Devices

A Comparative Analysis of the Energy Performance Characteristics of Turbine Condenser Evacuation Devices

INFLUENCE OF ELECTROMAGNETIC RADIATION ON RESISTANCE OF SEMICONDUCTOR DEVICES

The subject matter is the processes of analysis and mechanisms of appearance of instabilities of natural vibrations of semiconductor structures., due to their interaction with flows of charged particles under the influence of external electromagnetic radiation. It is shown that the influence of pulsed electromagnetic radiation is accompanied by the appearance of currents in the conductive elements of products that are capable of exciting natural oscillations of semiconductor components and are the cause of failures of radio products. The aim is to develop the theory of collisionless damping of surface polaritons in the classical approximation, as well as to study the mechanisms of collisionless damping of surface plasmons at the boundaries of semiconductor components of radio products under conditions when the temperature of carriers of conducting solids is much lower than the plasmon energy (quantum approximation). The objectives are: a kinetic equation describing the change in the number of surface plasmons as a result of their interaction with conduction electrons; obtaining its solution, which determine the decrement of oscillations and the power of spontaneous emission of particles. The methods used are: a method of successive approximations for solving the kinetic equations of the charged particle flux - semiconductor structure system within the framework of the quantum approach, when the interaction of waves and particles is in the nature of random collisions and is described by the method of secondary quantization of the system (representation of occupation numbers). The following results are obtained: Expressions are obtained for the decrements of surface plasmons in the presence of an infinitely high and infinitely small potential barrier at the interface between media. A kinetic equation is obtained that describes the change in the number surface plasmons as a result of their interaction with conduction electrons; his decisions are given, which determine oscillation decrement. Expressions are obtained for the decrements of surface plasmons at presence of infinitely high and infinitely small potential barrier at the interface between A physical model of the occurrence of reversible failures (effects induced by electromagnetic radiation currents per volt - ampere characteristics of semiconductor devices). The ranges of parameters of the external electromagnetic radiation at which this physical model is realized. Conclusion. Calculated relations are obtained that relate the parameters of semi-conductor structures: the concentration of free carriers, permittivity, carrier temperature with the value oscillation decrement in the classical and quantum approximations. The comparative analysis of quantitative estimates of the increments of oscillation instabilities carried out in the work makes it possible to solve the problems of optimizing the operating characteristics of active devices in the microwave range. The results of the work can be used in the development of microwave devices designed to amplify, generate and convert electromagnetic oscillations in the millimeter and submillimeter ranges.

Research on Laboratory Test Method of Wave Energy Converter Wave-Wire Conversion Ratio in Irregular Waves

The laboratory test of the wave energy converter model is an important means to evaluate the performance of the device. At present, there are few performance tests for complete specifications under the irregular wave. Referring to the test methods and standards at home and abroad, combined with the actual test work experience in the laboratory, using the irregular wave power calculation formula with the effective wave height and the spectral peak period as parameters, then the wave-wire conversion ratio test method of the wave energy converter physical model under irregular waves in the laboratory is proposed. The method is applied to the basin test experiment of the physical model of the horn-shaped backward bent duct buoy (BBDB) wave energy converter. The research results show that the established test method and process of wave-wire conversion performance have achieved good application results in the irregular waves laboratory test, and can better reflect the device operating characteristics in real sea conditions. The test results provide data support for the model design of the wave energy converter in the next test stage, the demonstration test of the prototype, and the prediction of power generation in real sea conditions.

Low-intensity low-temperature analysis of perovskite solar cells for deep space applications

Perovskite solar cells (PSCs) are studied in low-intensity low-temperature (LILT) conditions before and after low energy proton irradiation to characterize device performance at deep space mission-relevant light intensities and temperatures.

An Overview of Current Printing Technologies for Large-Scale Perovskite Solar Cell Development

The power conversion efficiencies (PCEs) of Perovskite solar cells (PSCs) have seen significant performance improvements between 2012 and 2022. PSCs have excellent optoelectronic properties and can be built using low-cost materials. In order to compete with first-generation photovoltaic technologies, it will be necessary to scale up production. This review article explores the advancements in several scalable perovskite deposition techniques, including recent developments in the fabrication of high-quality perovskite film, their stabilities and commercialization status. Several scalable deposition techniques are discussed, including user-friendly solution-techniques (spin coating, slot die coating, etc.), vapour-assisted deposition approaches in the laboratory and full-scale commercial applications. The aforementioned deposition techniques have advantages compared to deposition techniques based on cost, effective mask-less patterning and unparalleled-design freedom. Other potential advantages include optimal use of materials, scalability, contactless deposition in high-resolution and a rapid transformation from small laboratory-scale work to large industrial-scale roll-to-roll production. Most recent technological advancements and structural developments relate to long-term thermal stability and moisture resistance. Many of the developments are still in the evolving field of lab-scale devices. The improvement roadmap and commercialization aspects of PSC manufacture involve two significant milestones: bridging the gap between the performance characteristics of small-scale and large-scale devices and the scalable printing techniques for all the layers in the device.

EXERGY ANALYSIS OF AN OPEN-MODE ADSORPTIVE HEAT STORAGE UNIT BASED ON COMPOSITE ADSORBENT ‘SILICA GEL – CRYSTALLINE HYDRATE’

Exergy analysis of an open-mode adsorptive heat storage unit has been performed when a composite ‘silica gel – crystalline hydrate’ used as an adsorbent. The crucial factors affecting the exergy efficiency factor are stated to be temperature and initial humidity of airflow supplied to the inlet of adsorbent layer, temperature of external air and methods of air flow humidification. Procedure of calculation of the operating characteristics of an open-mode adsorptive heat storage device was further developed. The suggested procedure involves determination of adsorption, specific adsorption heat and final airflow temperature, useful heat, heat inputs for operating heat storage device and its efficiency factor, then exergy recovered, exergy supplied and exergy efficiency are calculated. Exergy efficiency depends on characteristics of flow of humid air fanned into the adsorbent layer such as temperature and initial absolute humidity which strongly affect the adsorption and final airflow temperatures. Increase of initial temperature of the humid air leads to decreasing of the exergy efficiency. Maximal values of exergy efficiency are determined at the absolute humidity and temperatures of initial airflow within the ranges of 0.03 – 0.04 kg/m3 and 20 – 30ºC, respectively. These characteristics are corresponded to the maximal airflow temperatures after passing through the adsorbent layer which meet to the Sanitary Regulations. Dependence of exergy efficiency vs. external air temperature and initial airflow temperature is shown. The exergy efficiencies of the open-mode adsorptive heat storage unit with steam and ultrasonic humidification were compared. Ultrasonic humidification is shown to allow increasing the exergy efficiency by 7 % against steam humidification. The obtained results can be used when energy-efficient heat and ventilation systems for residential premises developed.