Performance Analysis of Thermoacoustic Refrigerator of 10 W Cooling Power made up of Poly-Vinyl-Chloride for Different Parallel Plate Stacks by using Helium as a Working Fluid

2021 ◽  
Author(s):  
N. V. Shivakumara ◽  
Arya Bheemsha
Keyword(s):  
Performance Analysis ◽  
Vinyl Chloride ◽  
Parallel Plate ◽  
Working Fluid ◽  
Cooling Power ◽  
Poly Vinyl Chloride ◽  
Thermoacoustic Refrigerator

scholarly journals Influence of Parallel Plate Stack Spacing on the Temperature Difference of Thermoacoustic Refrigerator by using Helium as a Working Medium

2019 ◽  
Vol 8 (4) ◽  
pp. 2704-2712
Keyword(s):  
Heat Exchanger ◽  
Temperature Difference ◽  
Parallel Plate ◽  
Sheet Material ◽  
Maximum Temperature ◽  
Working Fluid ◽  
Operating Pressure ◽  
Parallel Plates ◽  
Refrigeration System ◽  
Thermoacoustic Refrigerator

The refrigerants are usually provided in the conventional refrigeration system despite the fact that, they produce CFCs and HCFCs, which are hazardous to the environment. However, these disadvantages can be overcome using air or inert gas in the thermoacoustic refrigeration system. The present research involves the effect of spacing of parallel plate stack on the performance of thermoacoustic refrigerator (TAR) in terms of temperature difference (∆T). The entire resonator system as well as other structural parts of the refrigerator are fabricated by using PVC to reduce conduction heat loss. Three parallel plate stacks have been used to study the performance of TAR considering different porosity ratios by varying the gap between the parallel plates (0.28 mm, 0.33 mm and 0.38 mm). The parallel plate stacks are fabricated by using aluminium and mylar sheet material and the working fluid used for the experimental study is helium. The experiments have been carried out with different drive ratios ranging from 0.6% to 1.6% with operating frequencies of 200 – 600 Hz. Also the mean operating pressure used for the experiment is 2 to 10 bar and cooling load of 2 to 10W are considered. The ∆T between the hot heat exchanger and cold heat exchanger is recorded using RTDs and Bruel and Kjaer data acquisition system. Experimental results shows that the lowest temperature measured at cold heat exchanger is -2.1 oC by maintaining the hot heat exchanger temperature at about 32 oC. The maximum temperature difference of 32.90 oC is achieved.

Performance Analysis of Poly Vinyl Chloride Outsole Using FEA Method

2016 ◽  
Vol 860 ◽  
pp. 146-151 ◽  
Author(s):  
Nil Ratan Mondal ◽  
Md Minar Ahmed ◽  
Md Samsul Arefin ◽  
Mahabub Hasan Rony
Keyword(s):  
Performance Analysis ◽  
Vinyl Chloride ◽  
Weather Condition ◽  
Ground Surface ◽  
Surface Friction ◽  
Fe Model ◽  
Fe Method ◽  
Maximum Displacement ◽  
Physical Measurements ◽  
Poly Vinyl Chloride

This paper focused on the performance analysis of Poly vinyl chloride (PVC) outsole in order to improve the sustainability of the outsole design. According to footwear construction, outsole is the outermost layer which comes with direct contact with ground surface. A broad spectrum of materials are used in footwear construction as outsole but PVC is widely used which is manufactured from monomer named vinyl chloride. During wearing life cycle, footwear as well as the outsole has to pass through various mechanical operation, weather condition, ground surface friction and body weight pressure, hence the shape of the outsole may be distorted which may affect the foot. In order to consider these factors, several prototype outsoles required to test in biomechanics lab before mass production that is expensive and time consuming. Therefore, this study aimed to employ a finite element (FE) method to investigate the performance of PVC outsole by analyzing properties such as stress, thermal insulation behavior, factor of safety, fatigue check. A detailed 3D PVC FE model was created using Solid Works Software. The FE model calculation was compared to the physical measurements of a PVC outsole to validate the FE model. After the FE model validation, this study conducted different outsole properties analysis. This FE stress analysis reveals that the maximum stress was occurred in the heel breast portion. Therefore, material density should be given high in this portion to prevent crack development. The displacement analysis result reveals that in the forepart of the outsole, the maximum displacement occur which is 15.6748 mm and the thermal analysis result shows that there will be no crack develop in the outsole even at-20°C and the outsole was thermally stable up to-20°C.

Aerodynamic and Thermal Measurements in a Standing Wave Thermoacoustic Refrigerator

2010 ◽  
Author(s):  
Gaelle Poignand ◽  
Emmanuel Jondeau ◽  
Philippe Blanc-Benon
Keyword(s):  
Heat Transfer ◽  
Standing Wave ◽  
Heat Exchangers ◽  
System Performance ◽  
Heat Fluxes ◽  
Acoustic Energy ◽  
Working Fluid ◽  
Cooling Power ◽  
Thermal Measurements ◽  
Thermoacoustic Refrigerator

Thermoacoustic refrigerators produce a cooling power from an acoustic energy. Over the last decades, these devices have been extensively studied since they are environment-friendly, robust and miniaturizable. Despite all these advantages, their commercialization is limited by their low efficiency. One reason for this limitation comes from the complex thermo-fluid process between the stack and the two heat exchangers which is still not sufficiently understood to allow for optimization. In particular, at high acoustic pressure level, vortex shedding can occur behind the stack as highlight by [Berson & al., Heat Mass Trans, 44, 10151023 (2008)]. The created vortex can affect heat transfer between the stack and the heat exchangers and thus, they can reduce the system performance. In this work, aerodynamic and thermal measurements are both conducted in a standing wave thermoacoustic refrigerator allowing investigation of vortex influence on the system performance. The proposed device consists on a resonator operated at frequency of 200 Hz, with hot and cold heat exchangers placed at the stack extremities. The working fluid is air at ambient temperature and atmospheric pressure. The aerodynamic field behind the stack is described using high-speed Particle Image Velocimetry. This technique allows the acoustic velocity field measurement at a frequency up to 3000 Hz. Thermal measurements consist on the acquisition of both the temperature evolution along the stack and the heat fluxes extracted at the cold heat exchanger. These measurements are performed by specific micro-sensors developed by MEMS technology. The combination of these two measurements should be helpful for the further understanding of the heat transfer between the stack and the heat exchangers.

Design and Comparative Analysis of Thermoacoustic Refrigerators

2017 ◽  
Vol 25 (01) ◽  
pp. 1750002 ◽  
Author(s):  
B. G. Prashantha ◽  
M. S. Govinde Gowda ◽  
S. Seetharamu ◽  
G. S. V. L. Narasimham
Keyword(s):  
Comparative Analysis ◽  
Heat Exchanger ◽  
Past Research ◽  
Performance Comparison ◽  
Working Fluid ◽  
Cooling Power ◽  
The Past ◽  
Present Design ◽  
Theoretical Minimum ◽  
Thermoacoustic Refrigerator

In this paper, the design of a loudspeaker driven 10[Formula: see text]W cooling power stack-based thermoacoustic refrigerator at 3% drive ratio for a temperature difference of 80[Formula: see text]K using helium as working fluid is discussed. The refrigerator is designed using linear thermoacoustic concepts. Using linear thermoacoustic equations, a theoretical minimum cold heat exchanger temperature is estimated at 75% porosity of stack-heat exchanger system. This paper focuses on the comparative analysis of the present design with the similar 10[Formula: see text]W thermoacoustic refrigerator designs found in the literature. The theoretical performance comparison of TSDH, TDH and CDH resonators designed at 2% and 3% drive ratio is discussed. The resonator designs are validated using DeltaEC software and the results are discussed. DeltaEC simulation results show that the diameter of the vibrating diaphragm of the loudspeaker equal to the diameter of the stack-heat exchangers system has higher electroacoustic efficiency (74.7%) and better performance compared to the smaller diaphragm (42.6%) used in the past research.

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