scholarly journals Experimental analysis of domestic refrigeration system using nanorefrigerant [CeO2+ZnO+R134a]

2021 ◽  
pp. 244-244
Author(s):  
Satheshkumar Govindasamy ◽  
Mylsamy Kaliyannan ◽  
Saravanan Sadhasivam ◽  
Rajaguru Kadasari
Keyword(s):  
Zinc Oxide Nanoparticles ◽  
Air Conditioning ◽  
Heat Transfer Performance ◽  
The Other ◽  
Transfer Performance ◽  
Refrigeration System ◽  
Ozone Layer Depletion ◽  
Thermal Systems ◽  
Consumption And Saving ◽  
Reducing Energy

At the present scenario, the action of ensuing the philosophy of reducing energy consumption and saving it for longer period without drop off in performance is increased. On the other hand, global warming and ozone layer depletion become foremost challenges. These concerns are takes place in Thermal systems like refrigerator and air conditioning. To resolve the above challenges, the nano refrigerants are used in refrigeration, which has previously got the attention due to its distinctive properties such as thermal conductivity. They also have the potential to improve the heat transfer performance of refrigeration. This project interrogated on the performance of domestic refrigeration system using normal condenser and microchannel condenser with and without nanoparticles. The Cerium oxide and Zinc oxide nanoparticles in the size of about 20-30nm and 30-50nm respectively with R134a domestic refrigerant were used. The experimentation carried out using 2 gm ofCeO2and ZnO nanoparticles in three different ratios [0.5:1.5,1:1 and 1.5:0.5] with R134a refrigerant. Hereby, the result conquered that 33.3% increase in the Actual COP of domestic refrigeration system using normal condenser with 1:1 ratio of nanoparticles when compared with the refrigeration system using microchannel condenser with and without nanoparticles.

scholarly journals Research on Heat Transfer Performance of Micro-Channel Backplane Heat Pipe Air Conditioning System in Data Center

2020 ◽  
Vol 10 (2) ◽  
pp. 583
Author(s):  
Liping Zeng ◽  
Xing Liu ◽  
Quan Zhang ◽  
Jun Yi ◽  
Xianglong Liu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Heat Pipe ◽  
Temperature Difference ◽  
Air Conditioning ◽  
Heat Transfer Performance ◽  
Transfer Performance ◽  
Micro Channel ◽  
Filling Rate ◽  
Air Conditioning System

This paper deals with the heat transfer performance of a micro-channel backplane heat pipe air conditioning system. The optimal range of the filling rate of a micro-channel backplane heat pipe air conditioning system was determined in the range of 65–75%, almost free from the interference of working conditions. Then, the influence of temperature and air volume flow rate on the heat exchange system were studied. The system maximum heat exchange is 7000–8000 W, and the temperature difference between the inlet and outlet of the evaporator and the condenser is almost 0 °C. Under the optimum refrigerant filling rate, the heat transfer of the micro-channel heat pipe backplane system is approximately linear with the temperature difference between the inlet air temperature of the evaporator and the cooling distribution unit (CDU) inlet water temperature in the range of 18–28 °C. The last part compares the heat transfer characteristics of two refrigerants at different filling rates. The heat transfer, pressure, and refrigerant temperature of R134a and R22 are the same with the change of filling rate, but the heat transfer of R134a is lower than that of R22. The results are of great significance for the operational control and practical application of a backplane heat pipe system.

Study on the Effect of the Evaporator Area on the Heat Transfer Performance in the Gravity Feed Liquid Refrigeration System

2013 ◽  
Vol 441 ◽  
pp. 112-115 ◽  
Author(s):  
Qing Jiang Liu ◽  
Fang Han
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Temperature Difference ◽  
Heat Transfer Performance ◽  
System Optimization ◽  
Transfer Performance ◽  
Refrigeration System ◽  
Original Design ◽  
The Heat Transfer Coefficient

In order to study the effect on heat transfer performance of evaporator in the gravity feed liquid refrigeration system the different evaporator area, the simulation procedure is worked out. The procedure uses the visual basic language. The procedure can figure out the heat transfer coefficient and the temperature difference in different evaporator area and evaporating temperature with the required refrigerating capacity. Through simulation calculation, when the area is 80% of the original design area of evaporator, the evaporator of the heat transfer coefficient and heat transfer temperature difference is the most reasonable and the evaporator of the refrigerating capacity can meet the requirements of cold storage. The program provides the reliable data for the gravity feed liquid cooling system optimization.

Structure of Parametric Designing Simulation Platform of Automotive Air Conditioning Condenser

2012 ◽  
Vol 220-223 ◽  
pp. 689-692
Author(s):  
Yi Hua Ni ◽  
Hai Guo ◽  
Jian Wu ◽  
Jiang Xin Yang
Keyword(s):  
Mathematical Model ◽  
Air Conditioning ◽  
Heat Transfer Performance ◽  
Programming System ◽  
Transfer Performance ◽  
Operating Characteristics ◽  
Element Analysis ◽  
Automotive Air Conditioning ◽  
Element Simulation ◽  
The Mathematical Model

The physical and mathematical model of parallel flow automotive air condition condenser was built based on the analysis of its structure and operating characteristics; then the mathematical model was verified and optimized through finite element analysis and running experiments. The VB programming system was used to do Solidworks pro-development and condenser parameterization design module was built. Finally a condenser design and study platform facing to the heat transfer performance and structure with infinite element simulation and numerical simulation was realized.

scholarly journals Numerical Simulation of Heat Transfer Tube Characteristics of Refrigeration and Air Conditioning Based on Mixed Fractional Model

2021 ◽  
Vol 2074 (1) ◽  
pp. 012069
Author(s):  
Weihua Ding ◽  
Wei Chen
Keyword(s):  
Heat Transfer ◽  
Air Conditioning ◽  
Heat Transfer Performance ◽  
Enhancement Effect ◽  
Transfer Performance ◽  
Water Flow Velocity ◽  
Heat Transfer Tube ◽  
Transfer Tube ◽  
Heat Transfer Capacity ◽  
Performance Of Heat Transfer

Abstract The main parameters affecting the heat transfer performance of heat transfer tube heat exchanges include fin shape, fin spacing, fin thickness, tube row arrangement, tube diameter, dry and wet bulb temperature and flow rate. The air side heat transfer performance of heat transfer tube heat exchange and the influence of velocity field and temperature field distribution on heat transfer effect have been the focus of domestic and foreign scholars. In this paper, based on the mixed fraction model, CFD software is used to simulate the absorption process of gravity falling film outside the heat transfer tubes of refrigeration and air conditioning, and to study the flow and heat transfer characteristics of the process. The results show that, for the heat transfer tubes with the selected structure, the heat transfer capacity increases with the increase of water flow velocity, and the heat transfer enhancement effect of turbulence is enhanced. The heat transfer tubes have better comprehensive heat transfer performance than smooth tubes with the same diameter.

Performance Comparison of Rectangular and Air-Foil Shapes Offset Strip Flow Paths Micro Heat Exchangers

2007 ◽  
Author(s):  
Chien-Yuh Yang ◽  
Chun-Ta Yeh ◽  
Ting-Yu Lin
Keyword(s):  
Heat Transfer ◽  
Thermal Resistance ◽  
Heat Exchangers ◽  
Heat Transfer Performance ◽  
Performance Comparison ◽  
The Other ◽  
Transfer Performance ◽  
Test Results ◽  
Flow Paths

Six micro heat exchangers with rectangle, airfoil and shuttle type strips was designed and fabricated in the present work. Two major parameters were considered for heat transfer performance comparison. One is the effect of strip type and the other is the strip arrangement. From the test results, we may notice that for both rectangle and airfoil strips heat exchangers, those with shorter strips performed lower thermal resistance than those with longer strips. Furthermore, the heat exchangers with more strips have better heat transfer performance. However, the space between strips is limited by the fabrication techniques.

Analysis of the Condensate Carryover Phenomenon on Fin and Tube Evaporators

2015 ◽  
Vol 23 (01) ◽  
pp. 1550008 ◽  
Author(s):  
Emilio Navarro-Peris ◽  
Jose Miguel Corberan ◽  
Jose Gonzalvez ◽  
Miguel Zamora
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Surface Properties ◽  
Analytical Model ◽  
Drop Size ◽  
Heat Transfer Performance ◽  
The Other ◽  
Transfer Performance ◽  
Air Velocity ◽  
Experimental Campaign

Possible carryover of the condensate from the surface of the evaporator has always been a problem that in practice has been solved by limiting the air velocity. However, the need for more compact solutions and especially for the reduction of the frontal area in many applications requires the increase of the air velocity and therefore new solutions to overcome this problem must be developed. In this contribution, the authors develop an analytical model to estimate the evolution of the condensing drops over the fin surface of a heat exchanger as a function of the fin surface properties and air velocity. This model allows the estimation of the drop size when it starts to move and its trajectory and evolution along the fin. The possibility of drops forming water bridges in between the fins is also analyzed with estimation of the minimum fin separation to avoid its formation depending on the air velocity and the wettability of the fin surface. Finally, the results of an experimental campaign performed with two fin and tube coils of exactly same dimensions and geometry but with different fin materials: one with the standard aluminum fin and the other one with a specially outer hydrophilic layer, are presented, showing that this kind of coating avoids the condensate carryover with no appreciable penalty on the heat transfer performance.

Parameter Optimization for a Better Heat Distribution in a Microchannel Surface Cooler

2012 ◽  
Author(s):  
Natrah Kamaruzaman ◽  
Juergen J. Brandner
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Performance ◽  
The Other ◽  
Test Fluid ◽  
Heat Distribution ◽  
Transfer Performance ◽  
Channel Depth ◽  
Transfer Rates ◽  
Fluent Software ◽  
Copper Aluminum

Implementing short microchannels into a micro cooler device has been reported [1] as a way to obtain higher heat transfer rates compared to longer microchannel systems. In this publication simulation results obtained using Fluent software for two micro structure designs with symmetric passages containing two short microchannels are described. The first design shows a channel depth of 100 μm, the other one provides a channel depth of 50 μm. The purpose of this study is to define an optimized parameter set that will allow to optimize the heat distribution inside of microchannel devices. Polymer and copper has been selected as the test materials. As test fluid liquid water has been used. The results obtained with the simulations showed that the reduction of the depth of short microchannels while keeping the other dimensions constant increases the heat transfer performance. This is observed especially for a polymer device. The study of the influence of different materials such as polymer, copper, aluminum and steel has proven that the selection of highly conductive device material such as aluminum can enhance the heat transfer performance.

Study on the Adjustment Law of Supply Water Temperature of the Fan Coil Unit Based on Daily Air-Conditioning Load

2011 ◽  
Vol 374-377 ◽  
pp. 538-542 ◽  
Author(s):  
Zhi Jie Gao ◽  
Zhi Wei Wang ◽  
Ji Feng Zhao
Keyword(s):  
Heat Transfer ◽  
Water Temperature ◽  
Heat Pump ◽  
Air Conditioning ◽  
Heat Transfer Performance ◽  
Residential Buildings ◽  
Transfer Performance ◽  
Pump Unit ◽  
Heat Pump Unit ◽  
Supply Water

A new adjustment law of supply water temperature of heat pump unit was presented by analyzing heat transfer performance and computing supply water temperature of fan coil unit (FCU) in this paper. The paper established the energy equations for air side, water side and FCU in dry and wet conditions, respectively. And the heat transfer performance of FCU was obtained by analyzing the manufacturers’ performance data. According to an actual central air-conditioning system of residential buildings, we calculated the daily inlet water temperature of FCU and proposed the adjustment law for supply water temperature. The results show that the supply water temperature of cooling design day is 9.3°C, the daily supply water temperature of cooling season is higher than 7°C; the supply water temperature of heating design day is 36.4°C, the highest in heating season is 38.5°C, which is below the rated supply water temperature of heat pump unit, 45°C.

Research on Wet Thermal Recovery Plant Used by Air Conditioning

2012 ◽  
Vol 424-425 ◽  
pp. 1155-1158
Author(s):  
Yong An Li ◽  
Xue Lai Liu ◽  
Jia Jia Yan ◽  
Teng Xing
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Air Conditioning ◽  
Heat Transfer Performance ◽  
Three Dimensional ◽  
Transfer Characteristic ◽  
Thermal Recovery ◽  
Transfer Performance ◽  
Recovery Plant ◽  
Air Channels

Based on the simulation Computational Fluid Dynamics method, in view of air conditioning with wet thermal recovery plant for heat and mass transfer characteristic, establishes air channels in three-dimensional laminar flow and heat transfer, mass transfer coupling process of mathematical physics model, discusses the air conditioning with wet thermal recovery plant air channels in temperature, concentration and pressure parameters such as distribution, application enthalpy efficiency analysis method to the heat transfer performance is evaluated. The results indicate that structure parameters of wet thermal recovery plant used by air conditioning play important influence for the heat transfer performance and flow resistance performance. The research conclusion provides guidance for air conditioning with wet thermal recovery plant of optimization.

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