Comparative Study Between Vortex Tube Refrigeration System and Regular Air Conditioner

Resonance is a critical phenomena in the designing of any structure. Piping structure, which is one of the several elements of air conditioning and refrigeration system, undergo severe vibration. In practice different approaches such as experimental, analytical, numerical and statistical methods are used to study vibration characteristics of a structure. Statistical method acts as a first hand tool to judge the behaviour of a system. Statistical methods minimise redesign process and expensive methods of controlling vibrations, saving significant amount of effort, cost and time. In the present study, statistical methods are used to estimate fundamental natural frequency of a pipe by selecting different geometrical parameters. The natural frequency obtained can be used to check resonance. Geometrical parameters, which significantly affect the natural frequency, are estimated by using Design of Experiments (DOE) and Analysis of Variance (ANOVA) techniques. A linear equation that predicts fundamental frequency is formulated using regression analysis. Frequencies predicted by regression model are compared to frequencies obtained from ANSYS Mechanical©. A good correlation is found with error less than 5%.

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COMPARATIVE STUDY ON PERFORMANCE OF ALTERNATIVE REFRIGERANT USED IN WINDOW AIR CONDITIONER

International Journal of Advance Engineering and Research Development ◽

10.21090/ijaerd.020667 ◽

2015 ◽

Vol 2 (06) ◽

Keyword(s):

Comparative Study ◽

Air Conditioner ◽

Alternative Refrigerant

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Performance characteristics of low global warming potential R134a alternative refrigerants in ejector-expansion refrigeration system

Archives of Thermodynamics ◽

10.1515/aoter-2016-0027 ◽

2016 ◽

Vol 37 (4) ◽

pp. 55-72

Author(s):

Shubham Mishra ◽

Jahar Sarkar

Keyword(s):

Cooling Capacity ◽

Area Ratio ◽

Coefficient Of Performance ◽

Air Conditioner ◽

Refrigeration System ◽

Alternative Refrigerants ◽

Entrainment Ratio ◽

Maximum Improvement ◽

Maximum Coefficient ◽

Volumetric Cooling

AbstractPerformance assessment of ejector-expansion vapor compression refrigeration system with eco-friendly R134a alternative refrigerants (R152a, R1234yf, R600a, R600, R290, R161, R32, and propylene) is presented for air-conditioning application. Ejector has been modeled by considering experimental data based correlations of component efficiencies to take care of all irreversibilities. Ejector area ratio has been optimized based on maximum coefficient of performance (COP) for typical air-conditioner operating temperatures. Selected refrigerants have been compared based on area ratio, pressure lift ratio, entrainment ratio, COP, COP improvement and volumetric cooling capacity. Effects of normal boiling point and critical point on the performances have been studied as well. Using ejector as an expansion device, maximum improvement in COP is noted in R1234yf (10.1%), which reduces the COP deviation with R134a (4.5% less in basic cycle and 2.5% less in ejector cycle). Hence, R1234yf seems to be best alternative for ejector expansion system due to its mild flammability and comparable volumetric capacity and cooling COP. refrigerant R161 is superior to R134a in terms of both COP and volumetric cooling capacity, although may be restricted for low capacity application due to its flammability.

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