http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : M. S. GOVINDE GOWDA (검색결과 6 건)
- 무료
- 기관 내 무료
- 유료
-
Design and Comparative Analysis of Thermoacoustic Refrigerators
B. G. PRASHANTHA,M. S. Govinde Gowda,S. SEETHARAMU,G. S. V. L. NARASIMHAM 대한설비공학회 2017 International Journal Of Air-Conditioning and Refr Vol.25 No.1
In this paper, the design of a loudspeaker driven 10 W cooling power stack-based thermoacoustic refrigerator at 3% drive ratio for a temperature difference of 80 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 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.
-
Design Construction and Performance of 10W Thermoacoustic Refrigerators
B. G. PRASHANTHA,M. S. Govinde Gowda,S. SEETHARAMU,G. S. V. L. NARASIMHAM 대한설비공학회 2017 International Journal Of Air-Conditioning and Refr Vol.25 No.3
In this paper, the construction and performance of the 10W cooling power thermoacoustic refrigerators designed for a temperature difference of 120 K at 3% drive ratio are discussed. The construction and assembly procedure of the optimized thermoacoustic refrigerator components viz. spiral stack, heat exchangers, 0.28λλ-taper, small diameter tube and divergent section with hemispherical end (TSDH) and 0.24λλ-taper and divergent section with hemispherical end (TDH) resonator designs and loudspeaker found in the published literature, and instrumentation are discussed. The performance of the 0.28λλ-TSDH, and 0.24λλ-TDH resonator designs, and the uncertainties involved in the experimental measurements are discussed. Both the resonator designs show good behavior. A decent low temperature of −−11.3∘∘C and −−8.7∘∘C at 10W cooling power is achieved at the cold heat exchanger for the 0.28λλ-TSDH and 0.24λλ-TDH resonator designs, respectively. The comparative analysis of the experimental results with the theoretical and DeltaEC results is discussed.
-
DESIGN AND OPTIMIZATION OF A LOUDSPEAKER DRIVEN 10-W COOLING POWER THERMOACOUSTIC REFRIGERATOR
B. G. PRASHANTHA,M. S. GOVINDE GOWDA,S. SEETHARAMU,G. S. V. L. NARASIMHAM 대한설비공학회 2014 International Journal Of Air-Conditioning and Refr Vol.22 No.3
The design and optimization procedure for a loudspeaker driven 10-W cooling power thermoacoustic refrigerator components with a temperature difference of 120 K has been discussed using the linear thermoacoustic theory. The resonator losses are proportional to surface area and the optimum diameter ratio of small and large resonator tubes for minimum heat loss for a quarter-wavelength hemispherical ended resonator design is discussed. The hemispherical ended resonator design is further analytically optimized to increase COP, cooling effect at cold heat exchanger and power density by decreasing total resonator surface area and volume. An alternate convergent-divergent resonator design is proposed which is found to be more efficient compared to previous published designs. Resonator designs are tested with DeltaEC software, which predicts a lowest temperature of -48°C and -47°C for the improved hemispherical and convergent-divergent resonator designs, respectively. Theoretical results are in good agreement with DeltaEC results.
-
DESIGN AND ANALYSIS OF THERMOACOUSTIC REFRIGERATOR
B. G. PRASHANTHA,M. S. GOVINDE GOWDA,S. SEETHARAMU,G. S. V. L. NARASIMHAM 대한설비공학회 2013 International Journal Of Air-Conditioning and Refr Vol.21 No.1
This paper deals with the design and analysis of a quarter-wavelength, 10W capacity, thermoacoustic refrigerator using short stack boundary layer approximation assumptions. The e®ect of operating frequency on the performance of the refrigerator is studied using dimensional normalization technique. The variation of stack diameter with average gas pressure and cooling power is discussed. The resonator optimization is discussed and the calculation results show a 9% improvement in the coe±cient of performance and 201% improvement in power density for the optimized quarter-wavelength resonator compared to published optimization studies. The optimized resonator design is tested with DeltaEC software and the results show better performance compared to past established resonator designs.
-
THEORETICAL EVALUATION OF LOUDSPEAKER FOR A 10 WATTS COOLING POWER THERMOACOUSTIC REFRIGERATOR
B. G. PRASHANTHA,M. S. GOVINDE GOWDA,S. SEETHARAMU,G. S. V. L. NARASIMHAM 대한설비공학회 2013 International Journal Of Air-Conditioning and Refr Vol.21 No.4
This paper presents a design of moving coil loudspeaker for a 10W cooling power thermoacoustic refrigerator. An electrical model is presented which simulates the behavior of the loudspeaker. The gas spring system for matching the frequency of the commercially available loudspeaker with the frequency of the acoustic resonator tube for maximizing electro-acoustical e±ciency of the loudspeaker is discussed. The optimum back volume for the gas spring system is found to be 59.7 cc, which is about 1.9% of the total resonator volume when the loudspeaker frequency and the acoustic resonator frequency is made equal at 400 Hz with a moving mass of 20 g. The effect of force factor Bl on loudspeaker performance is discussed. Analysis results shows that for better performance of a refrigerator, the loudspeaker should be chosen to have a large force factor and small values for electrical and mechanical resistances. The refrigerator system is tested with DeltaEC software and its results are in good agreement with an electrical model results.
-
B. G. PRASHANTHA,M. S. Govinde Gowda,S. SEETHARAMU,G. S. V. L. NARASIMHAM 대한설비공학회 2015 International Journal of Air-Conditioning and Refr Vol.23 No.3
This paper deals with the basic insight of thermoacoustic refrigeration concepts, and the working principle, history and the role of linear thermoacoustic theory in designing a thermoacoustic refrigerator system are discussed. Resonator design optimization procedure for a 10W cooling power thermoacoustic refrigerators is discussed. The optimized resonator designs proposed in this paper are found to be efficient compared to published resonator designs. The effects of drive ratio on the theoretical performance by varying dynamic pressure amplitude from 0.2 bar to 0.4 bar in the steps of 0.05 bar on the optimized resonator designs are discussed. Performance simulation results for the optimized resonator designs using DeltaEC software are discussed. Simulation results are in agreement with theoretical results.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
