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Mechanical Engineering Department

Babasaheb Ambedkar Technology University,

Lonere, Dist Raigad

Details of proposed Project at IInd Year M. Tech (T&F)

Referred Literatures

M.K. Mittal, Ravi Kumar, Akhilesh Gupta

An experimental study of the flow of R-407C in an adiabatic helical capillary tube

Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee 247667, Uttarakhand, India, international journal ofrefrigeration 33 ( 2 0 1 0 ) 8 4 0 8 4 7

This paper presents an experimental investigation of coiling effect on the flow of R-407C in an adiabatic helical capillary tube. It has been observed that the coiling ofcapillary tube significantly influences the mass flow rate of R-407C through theadiabatic helical capillary tube. For straight capillary tube it has been observed thatthe mass flow rates in coiled capillary tube are 510 percent less than those in astraight one. The data obtained from the experiments was analyzed and non-dimensional correlations for the prediction of mass flow rate of R-407C in straightand helical capillary tube have been developed. The proposed correlations predictexperimental data in an error band of + 10 percent.

Sukkarin Chingulpitak, Somchai Wongwises

Effects of coil diameter and pitch on the flow characteristics of alternativerefrigerants flowing through adiabatic helical capillary tubes

The joint Graduate School of Energy and Environment, King Mongkut's University of Technology Thonburi, Bangmod, Bangkok 10140, Thailand, Fluid Mechanics,Thermal Engineering and Multiphase Flow Research Lab. (FUTURE), Department ofMechanical Engineering, King Mongkut's University of Technology Thonburi,Bangmod, Bangkok 10140, Thailand

This paper presents the effects of various geometries of helical capillary tubes onthe flow characteristics of alternative refrigerants flowing through adiabatic helicalcapillary tubes. The theoretical model is based on the conservation of mass, energyand momentum of fluids in the capillary tube. The two-phase flow model developedwas based on a homogenous flow assumption. The model was validated bycomparing it with the experimental data of Zhou and Zhang for R-22, particularlyvarious pairs of refrigerants. It was found conventional refrigerants had lowercapillary lengths than alternative refrigerants. For all pairs, the numerical resultsshowed that the traditional refrigerants consistently gave lower pressure drops forboth single-phase and two-phase flows, which resulted in longer tube lengths. Theresults show that coil diameter variation (less than 300 mm) for helical capillary

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tube geometries affected the length of helical capillary tubes. However, pitchvariation (more than 300 mm) had no significant effect on the length of helicalcapillary tubes. This adiabatic helical capillary tube model can be used to integratesystem models working with alternative refrigerants for design and optimization.

Zhou Guobinga, Zhang Yufengba Department of Building Science, School of Architecture, Tsinghua University,Beijing 100084, Chinab School of Environmental Science and Engineering, Tianjin University, Tianjin300072, China

Numerical and experimental investigations on the performance of coiled adiabaticcapillary tubesApplied Thermal Engineering 26 (2006) 11061114

Paper presents the performance of coiled adiabatic capillary tubes both numericallyand experimentally by comparison with the straight capillaries. With the developedmodel including meta-stable both liquid and two-phase regions, three methods arediscussed to calculate friction factors for coiled capillary tubes. Mass flow ratethrough the capillary is measured with different tube geometries and under variousoperating conditions. Compared with the present experimental data and that inliterature gives the best prediction with the average deviation of 5%. The testresults show that mass flow rate in a capillary tube increases with increase of coileddiameter (D), but changes little beyond D = 300 mm. And the mass flow rate withcoiled diameter of 40 mm is approximately 10% less than that of straight capillarytube.

Project Objective

Modeling for Prediction of Mass Flow Rate for Coiled Capillary Tube of Domestic

Refrigerator (R600a/R290 50:50) using Artificial Neural Network

Very few works are reported in the literature survey for modeling using refrigerant

R600a/R290 for domestic refrigerator (hence working substance is selected as

R600a/R290). Several mathematical models are available in literatures for straight

and coiled capillary tube for prediction of mass flow rate with an error of 5 to 10 %.

Since ANN is proved to be very good tool for predictions and optimization, hence

modeling with artificial neural network is selected.

Same work can be expanded for modeling with ANFIS (Artificial Neural FuzzyInterference System)

Test Procedure

Will try to follow American National Standard ANSI/AHAM HRF-1-2004,Household Refrigerators/Household FreezersApplies to household refrigerators, refrigerator-freezers, freezers and wine chillers

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This standard covers definitions, methods for computing volumes and shelf areas,methods for determining volumes of special features, performance test procedures,and durability test procedures, methods for determining energy consumption andenergy factor, and safety recommendations

OR

Indian Standard IS 1476 : Part 1 : 2000

Performance of Household Refrigerating Appliance - Refrigerators with or Without

Low Temperature Compartment - Part 1 : Energy Consumption and Performance

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Experimental Setup Required

1. 165 lit Refrigerator

2. Copper Coiled Capillary Tube

3. Energy Meter

4. Thermocouples and Temperature Indicator

5. Pressure Gauges

6. Surface Roughness Tester

7. Data Logger

8. Flow Meter for mass flow rate measurement

Project Sponsored By

AIM-Enviro Pvt. Ltd., Nasik (MS)

Project Supervisor at Industry

Dr. M. M. Kulkarni (Proprietor)

Mr. S. D. Parkhi (Energy Consultant & Chief Consultant Organization Shree

Consultants Nasik)