Power Consumption Of Refrigerator Research Articles

편의점 냉동/냉장/냉난방 전력사용량 측정 및 분석

This paper contains the contents of each measurement and analysis of the refrigeration/refrigeration/cooling and heating power consumption of a convenience store. In particular, it was confirmed that the temperature affects the refrigeration/cooling and heating power consumption. Refrigeration power consumption has a linear function that increases as the temperature rises, and cooling and heating energy has a quadratic function that increases the amount of power used when the specific temperature rises or falls to an inflection point.

Performance investigation and exergy analysis of vapor compression refrigeration system operated using R600a refrigerant and nanoadditive compressor oil

Compression of vaporized refrigerant is the essential process of the refrigeration cycle which is performed by using a compressor. The amount of power consumed by a refrigeration system is governed by the work input given to its compressor, which also determines the COP of the system. By reducing the work input given to the compressor, the power consumption of refrigerator is reduced along with the improvement in its COP. Nowadays, nanoparticles have emerged as the new generation additives in various working fluids because of their remarkable ability to improve the heat transfer, tribological and other thermophysical properties of the base fluid. In such a vein, we propose a compressor oil based nanofluid prepared by dispersing nanoparticles into the conventional compressor oil. In the present study, four samples of nanoadditive compressor oil were prepared by dispersing the nanoparticles like Al2O3, TiO2, and ZnO into the conventional mineral oil as a lubricant. The tribological properties of this four samples were studied, out of which one sample gave a better lubrication and heat transfer properties which are considered as one of the key parameters for reducing work input to the compressor, this can result in reduced power consumption, with enhancement of COP. These results are analyzed experimentally by carrying out performance and exergy analysis in a vapor compression refrigeration system, using R600a as a refrigerant. The experimental results show that, there is an improvement of COP by 14.61% and exergy efficiency by 7.51%. Also, the efficiency defect in the major components of vapor compression refrigeration system has been reduced effectively.

Reduction in power consumption of refrigerator by using parallel expansion

This study aims to determine the reduction in power consumption of refrigerators by using parallel expansion. A refrigerator with a capacity of 120 litters has been used as a test instrument and R134a acts as a working fluid. Recording of refrigerator energy consumption is based on changes in cooling load temperature from range 3C to -3 C. The parameters observed during the test include suction pressure, discharge pressure, electric current, and weight of refrigerant circulated. The results indicate that installation of parallel expansion device on the refrigerator generates a decreased 1.5% - 4% of the electrical power consumption (ECP) so that it implicates for the save on power consumption required a refrigerator.

Turbo-Brayton Refrigerator for High Temperature Superconducting Device

High temperature superconducting (HTS) cable is kept below the material specific critical temperature utilizing sub-cooled liquid nitrogen. Sub-cooled liquid nitrogen to flow in a HTS cable is cooled and circulated by a refrigerator and a pump. The high efficiency refrigerator is important in order to reduce the transmission loss of HTS cable including the power consumption of refrigerator. Then we have developed the high efficiency and reliability refrigerator.We set a goal of developing a refrigerator with a COP of 0.1, a maintenance interval of 30,000 hours and a cooling capacity of 5kW. Our goal was achieved by using the reverse Brayton cycle and turbo-compressor and expander. A year-long performance test had verified that our cooling system of sub-cooled liquid nitrogen using this refrigerator is stable for long operation.

Simulation Analysis on Sun-Shading Design Case of Buildings in Cold Regions

The sun-shading design was carried out based on a comprehensive building in a cold region. The reasonable building sun-shading design method in combination with the regional and facade characteristics in the cold regions is discussed, meanwhile, the unit-area refrigeration power consumption of the room and the annual building energy consumption before and after sun-shading setting are analyzed with simulation software. It is proposed that in the cold regions, designing sun-shading reasonably can reduce air conditioners energy consumption in summer, improve the indoor thermal environment and increase the indoor comfort level. This research can provides a technical reference to promote the sun-shading and building integration design and application in the cold regions.

멀티냉장고용 에너지 절감형 전력변환기 및 통합 제어시스템 개발

Recently trends of home appliance has been changed in house and the demand for functional refrigerator has been increased. Power consumption of refrigerator accounts for a large proportion in consumer electronics. Also, compressor accounts for most of the power consumption in refrigerator parts. Therefore, this paper proposes a multi-refrigerator system with single compressor & condenser fan in order to reduce energy. To verify the availability of the proposed multi refrigerant system, integration experiment is carried out.

Reduction in the Electric Power Consumption of a Thermoelectric Refrigerator by Experimental Optimization of the Temperature Controller

Most thermoelectric refrigerators used for food conservation are operated by on/off temperature controllers, because of their simplicity and low cost. This type of controller poses a major problem: when the inner temperature reaches the lower setpoint and the thermoelectric modules are switched off, a great amount of the heat stored in the heat exchanger at the hot end of the modules goes back into the refrigerator, by heat conduction through the modules and the heat extender. This effect significantly increases the electric power consumption of the refrigerator. This work studies experimentally the influence of different temperature control systems on the electric power consumption and coefficient of performance of a thermoelectric refrigerator: an on/off controller, a proportional–integral–derivative controller, and a novel operating system based on idling voltages. The latter provides voltage to the modules once the inner temperature reaches the lower setpoint, instead of switching them off, preventing heat from going back. A prototype has been constructed to compare these operating systems. Results prove that the controller based on idling voltages reduces the electric power consumption of the refrigerator by 32% and increases the coefficient of performance by 64%, compared with the on/off controller.

천연가스 냉각을 위한 1단 냉동과 2단 냉동 사이의 비교연구

본 연구에서는 천연가스의 온도를 <TEX>$-40^{\circ}C$</TEX>까지 냉각시키기 위해서 프로판을 냉매로 사용한 1단 냉동과 2단 냉동 사이의 비교연구를 수행하였다. 열역학 모델식으로는 Peng-Robinson 상태방정식을 적용하였으며, 냉동 사이클의 전산모사를 위해서 Invensys사의 PRO/II with PROVISION 8.3을 활용하였다. 본 연구에서로부터 2단 압축 냉동 사이클을 최적화한 결과 1단 압축 냉동 사이클에 비해서 압축기의 소요동력을 33.5% 가량 줄일 수 있었다. In this study, a comparative study was performed between one- and two-stage refrigeration system to cool the natural gas temperature down to <TEX>$-40^{\circ}C$</TEX> using propane as a chilling medium. As a thermodynamic model, Peng-Robinson equation of state equation was applied and PRO/II with PROVISION release 8.3 at Invensys company was utilized for the simulation of the refrigeration system. Through this study, optimization work showed that two-stage refrigeration system was proven to save about 33.5% refrigeration power consumption compared to the one-stage refrigeration cycle.

Design of Bi-based superconducting current lead for SMES

2.1 kA-class hybrid-type current leads for superconducting magnetic energy storage (SMES) magnets, consisting of conventional gas-cooled copper leads and high-T/sub c/ superconducting (HTSC) current leads, were designed. The HTSC parts of the leads are made of Bi-2223/99.8%Ag0.2%Au tape. For the design, numerical analysis was performed to find an optimum shape factor and an optimum varying rate of the cross-sectional area of HTSC lead which result in minimum refrigeration power consumption, and then the minimum evaporation rate of LHe. In the present study, the main results of the design are presented.

Ammonia synthesis enhancement through heat‐mass‐exchange

AbstractThe HME Ammonia Synthesis Enhancement is a simple process modification enhancing synthesis productivity by reducing energy consumption and/or increasing plant capacity as compared to conventional alternatives. In this paper, it is presented as an attractive alternative to low temperature ammonia separation in low pressure plants.Some HME performance sensitivities and their implications on the design of a unit are studied. Typical HME enhancement economics is summarized in comparison with a typical conventional alternative. This indicates a potential 25% reduction in refrigeration power consumption, paying out the HME unit in a relatively short time. The application of the HME enhancement is expected to promote synthesis at lower pressures.