scholarly journals High Efficiency Room Air Conditioner

2015 ◽  
Author(s):  
Pradeep Bansal
Keyword(s):  
High Efficiency ◽  
Air Conditioner

Development of High Efficiency and Low Noise Cross-Flow Fans for Room Air Conditioner Indoor Unit

2014 ◽  
Author(s):  
Hironobu Yamakawa
Keyword(s):  
High Efficiency ◽  
Length Distribution ◽  
Cross Flow ◽  
Low Noise ◽  
Navier Stokes ◽  
Outer Diameter ◽  
Air Conditioner ◽  
Blade Edge ◽  
Sinusoidal Shape ◽  
Cross Flow Fan

Cross flow fans are used for fan systems in a household room air conditioner indoor unit. In recently, in the view of environmental problem and cost saving, energy saving performance is important specification for users. Reducing fan motor electric power consumption is effective for this purpose. And also low noise fans are needed for comfortable circumferences. To meet these user needs, we developed a high efficiency and silent cross flow fan using CFD (Computational Fluid Dynamics) and experiments. In CFD, numerical model is calculated by commercial software using steady state, Reynolds-averaged Navier-Stokes (RANS) and k-ε turbulent flow model. The developed cross flow fan is geometrically characterized by the solidity (the ratio of the blade pitch and blade cord length) distribution, and the blade edge shape. The solidity average of developed fan was larger than the conventional fan and the solidity distribution was smooth. And the developed fan has the sinusoidal shape of the outer diameter edge. This sinusoidal shape edge makes pressure distribution on the tongue to be more dispersed compare to that of conventional straight edge so that tonal noise was restrained.

Development of Photocatalyst Plasma Air Cleaning Filter Used in Air Conditioner

2003 ◽  
Vol 6 (1) ◽  
Author(s):  
Sung Hwa Lee
Keyword(s):  
Removal Efficiency ◽  
Indoor Air ◽  
Air Pollutants ◽  
High Efficiency ◽  
Discharge Plasma ◽  
Air Conditioner ◽  
Pulsed Discharge ◽  
Air Cleaning ◽  
Cleaning System ◽  
Pulsed Discharge Plasma

AbstractThe purpose of this work is to develop a high efficiency air cleaning system for air pollutants such as particles, odor and suspended microbes in indoor air. In order to enhance a removal efficiency of odor pollutants, we suggested that pulsed discharge plasma be combined with TiO

Design and Simulation of PFC Converter for Brushless SRM Drive

2016 ◽  
Vol 7 (3) ◽  
pp. 625 ◽  
Author(s):  
M. Rama Subbamma ◽  
V. Madhusudhan ◽  
K.S.R Anjaneyulu
Keyword(s):  
Power Factor ◽  
High Efficiency ◽  
Industrial Applications ◽  
Input Power ◽  
Boost Converter ◽  
Air Conditioner ◽  
Switched Reluctance ◽  
Reluctance Motor ◽  
Bridge Rectifier ◽  
Speed Response

In most of the industrial applications, Switched Reluctance Motor (SRM) is mainly employed due to the reasons like having low maintenance and high efficiency. SRM consists of windings only on its stator, but would not have any windings on rotor thus having very simple construction. The available supply is AC. But AC cannot be directly supplied to SRM when used for air-conditioner application which is employed in this paper. Also power factor in the system needs to be corrected when using a SRM drive. Thus AC supply is fed to power factor correction (PFC) converter which is Buck-Boost converter here in this paper. The output of the PFC converter is fed to SRM through a simple asymmetrical converter. This PFC circuit consists of a simple diode bridge rectifier with Buck-Boost DC-DC converter. A suitable control circuit was proposed to control the input power factor under various loading conditions. This paper gives analysis of SRM drive for air-conditioner application with Buck-Boost converter based PFC circuit. A Matlab/simulink based model is developed and simulation results are presented. Simulation is carried out for different speed response.

THE PERFORMANCE OF CONDENSER UNDER DIFFERENT VEHICLE SPEEDS

2013 ◽  
Vol 21 (02) ◽  
pp. 1350013 ◽  
Author(s):  
CHIH-CHIU SHEN ◽  
JAU-HUAI LU
Keyword(s):  
Electric Vehicle ◽  
Electric Vehicles ◽  
Air Conditioning ◽  
High Efficiency ◽  
Cooling Capacity ◽  
Vehicle Speed ◽  
Air Conditioner ◽  
Electric Motors ◽  
No Emission ◽  
Air Conditioning System

Due to the concern in energy shortage and environmental protection, electric vehicle is considered to be a substitute for the conventional gasoline-powered vehicles due to its characteristics of high efficiency and no emission. However, the load of air conditioning causes a serious problem for electric vehicles, especially in tropical and subtropical areas. The compressor of conventional air conditioning system is driven by engine and its speed is thus coupled to vehicle speed. In electric vehicles, the compressor is driven by electric motors and compressor speed could be decoupled to vehicle speed. This mechanism provides an opportunity to improve the energy efficiency of electric vehicle since the operation of air conditioning system may be independent of vehicle speed. The purpose of this paper is to find out the electric fan operation model as vehicle speed is varied. This paper was to establish a theoretical model for the condenser of automotive air conditioner and to conduct simulation to evaluate the effect of vehicle speed on the cooling capacity and sub-cooling of condenser. Results of simulation demonstrated that vehicle with 6 km h-1 speed has the 5°C of sub-cooling at 0.0266 kg s-1 of refrigerant flow rate and the cooling capacity was 4.93 kW. In this study, an increase of 16.6% in cooling capacity can be reached as the speed of vehicle was raised from 6 to 110 km h-1 and can promote the sub-cooling to 19.5°C. It was also found that the cooling capacity of air conditioner is extremely sensitive to vehicle speed while the vehicle is running at low speed. Furthermore, increases in the vehicle speed resulted in reduction of the length of superheat region from 17.5 to 8.5 cm. Finally, a correlation among these variables and the simulated cooling capacity was obtained in this study, enabling the relevant researchers to evaluate automotive air conditioner performance under different vehicle speeds more easily.

Design and Performance Evaluation of a Trigeneration System Incorporating Hydraulic Storage and an Inverted Brayton Cycle

2008 ◽  
Vol 131 (1) ◽  
Author(s):  
Matthew Blieske ◽  
J. E. D. Gauthier ◽  
X. Huang
Keyword(s):  
High Efficiency ◽  
Small Scale ◽  
Brayton Cycle ◽  
Energy Prices ◽  
Air Conditioner ◽  
Single Family ◽  
Modes Of Operation ◽  
External Temperature ◽  
Generation Costs ◽  
The Individual

To bring the economic benefit of trigeneration to small-scale users without incorporating expensive components, an inverted Brayton cycle (IBC) is employed, which makes use of the expander section already present in a microturbine. An air accumulator provides pressurized air, which is passed through the expander section of the same microturbine used to charge the accumulator. The air passing through the IBC is cooled due to expansion, simultaneously providing power and cooling the flow. As the microturbine is indirectly fired, the flow passing through the engine or IBC can be directly vented into the household—eliminating the need for additional heat exchangers. The size of the cycle studied is on the order of 10 kW(e), suitable for a domestic household; however, the system is easily scaled for larger commercial applications. The majority of the components in the system being studied are “off the shelf” products. A feasibility study was conducted to ensure that the proposed system is economically competitive with systems currently used, such as individual generation provided by an air conditioner (A/C), a high efficiency natural gas (NG) furnace, and grid power. Simulations were run for a full year based on the actual external temperature and the electrical and thermal loads for a single family detached dwelling located in Winnipeg, Canada. Performance data were generated using MATLAB™ while the economic performance was determined with time-based simulations conducted using SIMULINK™. The system is designed to allow energy islanding by providing for all household energy needs throughout the year; however, integration with a power grid is optional. It was found that the operating costs for the proposed trigeneration system in an energy islanding mode of operation were equivalent to or less than individual generation (A/C unit, NG furnace, and grid power) during heating modes of operation and were more expensive for cooling modes of operation. The yearly energy cost for the trigeneration system exceeded the individual generation costs by 30–40%; however, there remains much room for improvement to the trigeneration concept. All economic data were based on fair market energy prices as found in central Canada.

Study of High Efficiency and Low Noise Centrifugal Fan

2011 ◽  
Author(s):  
Takanori Nagae ◽  
Zhiming Zheng
Keyword(s):  
High Performance ◽  
High Efficiency ◽  
Low Noise ◽  
Leakage Flow ◽  
Pressure Side ◽  
Centrifugal Fan ◽  
Air Conditioner ◽  
Air Conditioners ◽  
Leakage Flows ◽  
Centrifugal Fans

Centrifugal fans are widely used for air-conditioning equipments. Demands for air conditioners have arisen for quiet considered the indoor condition, energy saving associated with the global warming, and which have made it important to develop high performance fans. In order to meet these demands, the technology was studied to reduce leakage flow for a high efficiency and low noise centrifugal fan in this research. Leakage flow occurs when a part of air discharged from fans flows into a gap between the bellmouth and the shroud. This flow is the pressure loss because it returns from the high-pressure side to the low-pressure side wastefully. Furthermore, the high noise is caused, because this leakage air can’t flow along the shroud. As the final successful technology to reduce leakage flow, we have developed for the new bellmouth with multiple ribs on the bellmouth plane placed opposite fan. By using the new bellmouth, the centrifugal fan’s motor input for the 4-direction ceiling-embedded cassette type air conditioner has been reduced by 5.4[%] and the noise by 1.2[dBA]. We analyzed the leakage flow structures of the centrifugal fan were analyzed by the numerical simulation and LDV measurements. It has been found that the leakage flow is decreased, since the partial leakage flows back in an opposite direction to a gap between the bellmouth and the shroud. Additionally, it has been found that the turbulence intensity of outlet airflow is decreased by the new bellmouth.

scholarly journals Development of a High-Efficiency Gas-Liquid Separator for Room Air Conditioner

2016 ◽  
Vol 30 (1) ◽  
pp. 49-56
Author(s):  
Hiroki MURAKAMI ◽  
Hiroaki MAKINO ◽  
Yasuhide HAYAMARU ◽  
Tadashi SAITOU ◽  
Hironori NAGAI ◽  
...  
Keyword(s):  
High Efficiency ◽  
Air Conditioner ◽  
Liquid Separator
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