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Volume 7 ~ Issue 4 (April 2017)


Research Article  open access
Experimental Investigation of a Household Refrigerator Using Evaporative-Cooled Condenser
Sreejith K.|| T.R. Sreesastha Ram || Rizwan || Sachin M.P.|| Krishnaprasad T.S. ||Swaroop M.P.|| Varkey F Thachil.
India
Research Inventy: International Journal of Engineering & Science , Volume 7 ~ Issue 4 (April 2017)

Paper Index :: : 07.4721/xxxxxxx

Abstract

The objective of this paper was to investigate experimentally the effect of Evaporative-cooled condenser in a household refrigerator. The experiment was done using HCF134a as the refrigerant. The performance of the household refrigerator with air-cooled and Evaporative-cooled condenser was compared for different load conditions. The results indicate that the refrigerator performance had improved when evaporative-cooled condenser was used instead of air-cooled condenser on all load conditions. Evaporative-cooled condenser reduced the energy consumption when compared with the air-cooled condenser. There was also an enhancement in coefficient of performance (COP) when evaporative-cooled condenser was used instead of air-cooled condenser. The Evaporative cooled heat exchanger was designed and the system was modified by retrofitting it, instead of the conventional air-cooled condenser by making drop wise condensation using water and forced circulation over the condenser. From the experimental analysis it is observed that the COP of evaporative cooled system increased by 13.44% compared to that of air cooled system. So the overall efficiency and refrigerating effect is increased. In minimum constructional, maintenance and running cost, the system is much useful for domestic purpose. This study also revealed that combining a evaporative cooled system along with conventional water cooled system under the condition that the defrost water obtained from the freezer is used for drop wise condensation over condenser and water cooled condensation of the condenser at the bottom using remaining defrost water would reduce the power consumption, work done and hence further increase in refrigerating effect of the system. The study has shown that such a system is technically feasible and economically viable.

KEY WORD: 165 litre domestic refrigerator, HCF134a, Evaporative-cooled condenser, experimental analysis, COP of refrigeration.


Research Article  open access
Comparison of Calorific Values of Various Fuels from Different Fuel Stations
Dr. A. Rajesh Kanna|| Akhil Chandran|| Anandu S Nair|| Arun R|| Jeffrey Jones Benedict
India
Research Inventy: International Journal of Engineering & Science , Volume 7 ~ Issue 4 (April 2017)

Paper Index :: : 07.4721/xxxxxxx

Abstract

Current research takes in to account of calorific value of various fuel (Diesel) available in the state of Telangana (India). The purpose of this experiment is to determine the heat of combustion for diesel and to learn basic bomb procedures. This experiment will be accomplished by using an adiabatic bomb calorimeter. The fuel sold by different company show different calorific value; by finding out the change in the calorific we can find out the high quality fuel available in the market. This research had covered the importance of calorific value of different fuel (diesel) with the help of a case study from Lords Institute of Engineering & Technology

KEY WORD: adulteration, crucible, calorimeter, guinea pigs.


Research Article  open access
Elastic Metamaterials Analysis: Simple and Double Resonators
G. S. Rodrigues || H. I. Weber
Brazil
Research Inventy: International Journal of Engineering & Science , Volume 7 ~ Issue 4 (April 2017)

Paper Index :: : 07.4721/xxxxxxx

Abstract

Metamaterials are broadly defined as a material with properties not found in nature,i.e, a typically man made material especially designed to achieve certain unusual properties. First applications of metamaterials were in field of electromagnetic waves and some features of these materials were negative permeativity and negative refraction index. Due to similarity with electromagnetic waves, mechanical waves propagation through metamaterials began to be studied and the concept of elastic metamaterials was created. The main property of elastic metamaterial is the negative dynamic effective mass where the wave propagation is blocked.It will be discussed two kinds of unit cell that compound the elastic metamaterial and how some changes in parameters affect the metamaterial negative effective mass.

KEY WORD: Double Resonator, Metamaterial, Negative Effective Mass,Single Resonator














































































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