Radio frequency tempering of frozen pacific sauries ( Cololabis saira ) under batch and continuous mode: Temperature distribution and energy consumption evaluation

2020 ◽  
Vol 44 (1) ◽  
Author(s):  
Yao Yao ◽  
Yali Zhu ◽  
Jialing He ◽  
Feng Li ◽  
Juming Tang ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Temperature Distribution ◽  
Radio Frequency ◽  
Continuous Mode ◽  
Cololabis Saira

Investigation of Airflow and Temperature Distribution in the Freezer Cabinet of a Domestic No-Frost Refrigerator

2009 ◽  
Author(s):  
Melike Nikbay ◽  
M. Berkay Acikgoz ◽  
Husnu Kerpicci
Keyword(s):  
Energy Consumption ◽  
Temperature Distribution ◽  
Uniform Temperature ◽  
Flow Conditions ◽  
Piv Measurements ◽  
Factors Affecting ◽  
Flow And Heat Transfer ◽  
Cfd Analyses ◽  
Off Time ◽  
Laminar Flow Conditions

Uniformity of temperature distribution in a loaded freezer cabinet is one of the most important factors affecting energy consumption of a refrigerator. Present study focuses on the airflow behavior and the temperature distribution inside the freezer compartment of a domestic no-frost refrigerator. Energy consumption increases in a freezer cabinet if the temperature difference between the warmest load package and average of all packages is high. The objective is to reduce the energy consumption by providing a uniform temperature distribution and also to keep the food fresh for a longer time. In this study, the air flow and heat transfer during on-time and off-time periods inside the freezer compartment is modeled by considering turbulent and laminar flow conditions in 3D transient CFD analyses. The initial and boundary conditions are provided from temperature controlled room and PIV measurements. The CFD analyses obtained are verified by experimental measurements.

Effect of radio frequency (RF) drying technology on dehydration rate and energy consumption of Australia lignite

2015 ◽  
Vol 34 (2) ◽  
pp. 161-166 ◽  
Author(s):  
Ning Zhang ◽  
Lei Shi ◽  
Haitao Qi ◽  
Yimin Xie ◽  
Lianguo Cai
Keyword(s):  
Energy Consumption ◽  
Radio Frequency ◽  
Dehydration Rate ◽  
Drying Technology

Performance Assessment of Probe for Radio-Frequency Ablation

Volume 4 ◽  
2004 ◽  
Author(s):  
Ashvinikumar V. Mudaliar ◽  
Elaine P. Scott
Keyword(s):  
Temperature Distribution ◽  
Radio Frequency ◽  
Tumor Tissue ◽  
Healthy Tissue ◽  
Lower Portion ◽  
Distribution Data ◽  
Thermal Dose ◽  
Rf Ablation ◽  
Ablation Therapy ◽  
Tissue Region

Radio-frequency (RF) ablation is one of the most widely used methods for the treatment of hepatic malignancies. A finite element method (FEM) analysis was employed to determine the thermal dose delivered to the tumor/tissue region. We simulated heating within a RF probe implanted in generic tumor surrounded by healthy tissue using ANSYS. The 3-D model consists of a tumor / tissue region into which the RF probe is embedded inside the tumor. One-quarter symmetry was then invoked. The blood flow was modeled using Penne’s bio-heat transfer equation with differing perfusion rates between the healthy tissue and tumor volume based on literature values. The resulting temperature distribution throughout the region was determined over time. A program was written in Visual Basic to extract the temperature distribution data in the tumor/tissue region and calculate the thermal dose throughout the region. This was done by using a time–temperature Arrhenius relationship for chemical and physical rate process. Tissue necrosis is assumed complete when a thermal dose of one hour has been achieved at 43 °C. In the present study, the geometry of the electrode had a significant effect on the size of the volume of necrosis. It was found that the lower portion of the tumor did not receive the specified thermal dose relative to the upper portion of the tumor in single setting during the RF ablation therapy. This might be due to the Ni-Ti electrode, which protruded only from the top surface of the trocar. The effectiveness of the existing probe can be improved by having one more set of electrodes protruding out from the lower curved surface of the trocar. It was found that the modified probe significantly improved heating in the lower portion of tumor/tissue area, providing more symmetry between the upper and lower portion.

Investigation of Sample Atomization Using a Power-Modulated Radio-Frequency Glow Discharge Source

1996 ◽  
Vol 50 (3) ◽  
pp. 366-376 ◽  
Author(s):  
Mark Parker ◽  
R. Kenneth Marcus
Keyword(s):  
Glow Discharge ◽  
Radio Frequency ◽  
Average Power ◽  
Atomic Absorption Spectrophotometry ◽  
Orifice Diameter ◽  
Continuous Mode ◽  
Radio Frequency Glow Discharge ◽  
Discharge Source ◽  
Duty Cycles ◽  
Glow Discharge Source

A power-modulated (pulsed), radio-frequency glow discharge source by atomic absorption spectrophotometry (rf-GD-AAS) atomizer was used to evaluate the roles of applied power, pressure, orifice diameter, duty cycle, and power-on time in the production of gas-phase sample atoms. As expected, the response of the modulated rf-GD-AAS source generally followed the same trends as those exhibited by the more common continuous-powering scheme. The effects of discharge power and pressure on the observed plasma emission and absorbance transients are presented. Use of small duty cycles and higher instantaneous powers, thus keeping the same overall average power as in the continuous mode, was shown to increase the production of ground-state atoms. However, using very high instantaneous powers may more efficiently populate excited states of the atomic species, thus decreasing the observed absorption signal for resonant transitions. Individual pulse transients were shown to be distorted if the plasma “on” times approached periods down to 2 ms. Plasma stabilization times for measurements taken in the “dark” portion of the pulse cycle (i.e., after pulse termination) were comparable to those obtained in the continuous mode (on the order of a few seconds) with the use of the same source and sample. Calibration curves were used to investigate the analytical utility of different temporal regions of the absorption transients with comparisons made between the plasma “on” and “off” portions of the cycle in the quantification of continuous plasma operation.

scholarly journals Reduction of Energy Consumption for Tire Test Room

2021 ◽  
Vol 2120 (1) ◽  
pp. 012017
Author(s):  
M Z N M Ghazali ◽  
D T K Tien ◽  
S C Lim ◽  
K R Sarmin
Keyword(s):  
Energy Consumption ◽  
Temperature Distribution ◽  
Test Room ◽  
Average Performance ◽  
3 Dimensional ◽  
Start Up ◽  
Reduction Of Energy Consumption ◽  
Simulated Analysis

Abstract This article presents a software-implemented 3-dimensional simulated analysis of a 4-tire test room and the 6-tire test room. The results of the average performance through the simulated analysis of 100 iterations were obtained. The simulation showed the temperature distribution in the test rooms. This objective of this study was to assess the efficiency of the start-up process in each test room and to find the most efficient setup. A promising improvement would be to install the heaters at the bottom of the room under the drums instead of at the ceiling. The results of the simulation will be compared to the data of temperature logging of the tire test rooms once there is availability upon the lifting of the Covid pandemic lockdown restrictions.

scholarly journals Radio-frequency chain selection for energy and spectral efficiency maximization in hybrid beamforming under hardware imperfections

2020 ◽  
Vol 476 (2244) ◽  
pp. 20200451
Author(s):  
Evangelos Vlachos ◽  
John Thompson ◽  
Aryan Kaushik ◽  
Christos Masouros
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Radio Frequency ◽  
Spectral Efficiency ◽  
Significant Loss ◽  
System Modelling ◽  
Next Generation ◽  
Hardware Complexity ◽  
Millimetre Wave ◽  
Hybrid Beamforming

The next-generation wireless communications require reduced energy consumption, increased data rates and better signal coverage. The millimetre-wave frequency spectrum above 30 GHz can help fulfil the performance requirements of the next-generation mobile broadband systems. Multiple-input multiple-output technology can provide performance gains to help mitigate the increased path loss experienced at millimetre-wave frequencies compared with microwave bands. Emerging hybrid beamforming architectures can reduce the energy consumption and hardware complexity with the use of fewer radio-frequency (RF) chains. Energy efficiency is identified as a key fifth-generation metric and will have a major impact on the hybrid beamforming system design. In terms of transceiver power consumption, deactivating parts of the beamformer structure to reduce power typically leads to significant loss of spectral efficiency. Our aim is to achieve the highest energy efficiency for the millimetre-wave communications system while mitigating the resulting loss in spectral efficiency. To achieve this, we propose an optimal selection framework which activates specific RF chains that amplify the digitally beamformed signals with the analogue beamforming network. Practical precoding is considered by including the effects of user interference, noise and hardware impairments in the system modelling.

The Multitag Microwave RFID System with Extended Operation Range

2012 ◽  
pp. 197-217 ◽  
Author(s):  
Igor B. Shirokov
Keyword(s):  
Energy Consumption ◽  
Radio Frequency ◽  
Frequency Shift ◽  
Radio Frequency Identification ◽  
Noise Immunity ◽  
Phase Shifter ◽  
Useful Signal ◽  
Frequency Identification ◽  
Extended Operation ◽  
Passive Transponders

The problems of radio frequency identification are discussed. It was shown that the use of passive transponders is preferable, but weak energy of system in this case reduces the operation distance and decreases the noise-immunity of the system. The problems of traditional radio-frequency identification systems are discussed. In this chapter the use of homodyne method of useful signal selecting was proposed. The augmentation signal of transponder was obtained by means of frequency shift with the help of controlled phase shifter. This solution allows to increase the energy and the noise-immunity of the system (the operation distance is increased). Furthermore, the interrogator can treat several transponders simultaneously in this case. Additionally the use of one-port transistor amplifier for increasing of operation range was proposed. The energy consumption of such amplifier and its cost are very low, but the gain of amplifier can reach 20 dB and more.

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