scholarly journals 106 Study of Coupling Effect between Beam Vibration and Oval Vibration on Cylindrical Water Storage Tank

2005 ◽  
Vol 2005 (0) ◽  
pp. _106-1_-_106-6_
Author(s):  
Akira MAEKAWA ◽  
Yasutaka SHIMIZU ◽  
Michiaki SUZUKI ◽  
Katsuhisa FUJITA
Keyword(s):  
Storage Tank ◽  
Coupling Effect ◽  
Water Storage ◽  
Beam Vibration ◽  
Water Storage Tank

Nonlinear Vibration Response of a Cylindrical Water Storage Tank Caused by Coupling Effect Between Beam-Type Vibration and Oval-Type Vibration: Part 1 — Vibration Experiment

2006 ◽  
Author(s):  
Akira Maekawa ◽  
Michiaki Suzuki ◽  
Katsuhisa Fujita
Keyword(s):  
Nonlinear Vibration ◽  
Storage Tank ◽  
Coupling Effect ◽  
Water Storage ◽  
Scale Model ◽  
Water Storage Tank ◽  
Vibration Experiment ◽  
Input Acceleration ◽  
Beam Type ◽  
Reduced Scale

In this study, a vibration experiment with a reduced scale model of a large-size cylindrical water storage tank has been performed in order to investigate the nonlinear vibration responses of the cylindrical tank when the beam-type vibration and the oval-type vibration are coupled. In the vibration experiment, a sinusoidal sweep test was performed by using a shaking table on the reduced scale model of the cylindrical water storage tank filled with water to the 95% level. The test was conducted by varying the input acceleration from smaller to larger input in several steps to identify the vibration modes and evaluate the vibration behaviors of the beam-type vibration and the oval-type vibration. As a result, the resonance curves showed that the resonance frequency shifted to the lower frequency region and the response magnification factor became smaller when the input acceleration level became higher. When the magnitude of the input acceleration increased furthermore, the resonance curves were changed to be duller from the sharp peak and the resonance points became unclear. The measured displacements and strains of the sidewall of the model tank showed that the oval-type vibration was excited in the vicinity of the beam-type resonance frequency and that the amplitude of the oval-type vibration increased too significant to be ignored when larger input was applied. It was verified that the oval-type vibration with a subharmonic resonance of order one-half was excited when larger input was applied. This phenomenon was not observed when small input was applied. This shows that the vibration behaviors caused by coupling effect between beam-type vibration and oval-type vibration depend on the magnitude of input excitation. From these results, it can be assumed that the oval-type vibration is closely related to the nonlinear vibration response phenomena of a cylindrical water storage tank.

Energy-saving analysis of air source heat pump integrated with a water storage tank for heating applications

2020 ◽  
Vol 180 ◽  
pp. 107029
Author(s):  
Pin Wu ◽  
Zhichao Wang ◽  
Xiaofeng Li ◽  
Zhaowei Xu ◽  
Yingxia Yang ◽  
...  
Keyword(s):  
Energy Saving ◽  
Heat Pump ◽  
Storage Tank ◽  
Water Storage ◽  
Water Storage Tank ◽  
Air Source Heat Pump

scholarly journals The effect of household storage tanks/vessels and user practices on the quality of water: a systematic review of literature

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Musa Manga ◽  
Timothy G. Ngobi ◽  
Lawrence Okeny ◽  
Pamela Acheng ◽  
Hidaya Namakula ◽  
...  
Keyword(s):  
Systematic Review ◽  
Water Quality ◽  
Storage Tank ◽  
Grey Literature ◽  
Water Storage ◽  
Storage Tanks ◽  
Water Storage Tank ◽  
Hygiene Practices ◽  
Quality Of Water ◽  
Vessel Material

Abstract Background Household water storage remains a necessity in many communities worldwide, especially in the developing countries. Water storage often using tanks/vessels is envisaged to be a source of water contamination, along with related user practices. Several studies have investigated this phenomenon, albeit in isolation. This study aimed at developing a systematic review, focusing on the impacts of water storage tank/vessel features and user practices on water quality. Methods Database searches for relevant peer-reviewed papers and grey literature were done. A systematic criterion was set for the selection of publications and after scrutinizing 1106 records, 24 were selected. These were further subjected to a quality appraisal, and data was extracted from them to complete the review. Results and discussion Microbiological and physicochemical parameters were the basis for measuring water quality in storage tanks or vessels. Water storage tank/vessel material and retention time had the highest effect on stored water quality along with age, colour, design, and location. Water storage tank/vessel cleaning and hygiene practices like tank/vessel covering were the user practices most investigated by researchers in the literature reviewed and they were seen to have an impact on stored water quality. Conclusions There is evidence in the literature that storage tanks/vessels, and user practices affect water quality. Little is known about the optimal tank/vessel cleaning frequency to ensure safe drinking water quality. More research is required to conclusively determine the best matrix of tank/vessel features and user practices to ensure good water quality.

scholarly journals Minimum Number of Experimental Data for the Thermal Characterization of a Hot Water Storage Tank

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4741
Author(s):  
María Gasque ◽  
Federico Ibáñez ◽  
Pablo González-Altozano
Keyword(s):  
Experimental Data ◽  
Water Temperature ◽  
Temperature Profile ◽  
Storage Tank ◽  
Water Storage ◽  
Hot Water ◽  
Experimental Temperature ◽  
Inlet Temperature ◽  
Water Storage Tank ◽  
Minimum Number

This paper demonstrates that it is possible to characterize the water temperature profile and its temporal trend in a hot water storage tank during the thermal charge process, using a minimum number of thermocouples (TC), with minor differences compared to experimental data. Four experimental tests (two types of inlet and two water flow rates) were conducted in a 950 L capacity tank. For each experimental test (with 12 TC), four models were developed using a decreasing number of TC (7, 4, 3 and 2, respectively). The results of the estimation of water temperature obtained with each of the four models were compared with those of a fifth model performed with 12 TC. All models were tested for constant inlet temperature. Very acceptable results were achieved (RMSE between 0.2065 °C and 0.8706 °C in models with 3 TC). The models were also useful to estimate the water temperature profile and the evolution of thermocline thickness even with only 3 TC (RMSE between 0.00247 °C and 0.00292 °C). A comparison with a CFD model was carried out to complete the study with very small differences between both approaches when applied to the estimation of the instantaneous temperature profile. The proposed methodology has proven to be very effective in estimating several of the temperature-based indices commonly employed to evaluate thermal stratification in water storage tanks, with only two or three experimental temperature data measurements. It can also be used as a complementary tool to other techniques such as the validation of numerical simulations or in cases where only a few experimental temperature values are available.

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