scholarly journals Experimental Study of a Humidification-Dehumidification Seawater Desalination System Combined with the Chimney

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Fei Cao ◽  
Qingjun Liu ◽  
Hong Xiao
Keyword(s):  
Experimental Study ◽  
Wind Speed ◽  
Thermal Efficiency ◽  
Cooling Tower ◽  
Heating Power ◽  
Heat Power ◽  
Seawater Desalination ◽  
Remote Areas ◽  
Evaporation And Condensation

The solar humidification-dehumidification system is of high significance to the freshwater supply in remote areas. In the present study, a humidification-dehumidification seawater desalination system combined with the chimney is designed and experimentally evaluated. Main parameters influencing its freshwater productivity are analyzed. It is found from this study that the cooling tower is required to obtain long-term steady freshwater generation. Raising the temperature difference between the evaporation and condensation chambers would lead to the rise of the freshwater productivity. There is a turning wind speed, beyond which increasing the wind speed would lead to the decline of both the freshwater productivity and the thermal efficiency. The turning wind speed is relevant to the ambient humanity and the heating power. Decreasing the heat power would increase the turning wind speed. When the heating power is 4.9 kW, the highest freshwater productivity and the highest efficiency are 48 g/min and 32.14%, respectively.

Experimental Study of Hydraulic and Heat and Mass Transfer Parameters of Inclined-corrugated Contact Elements of Cooling Tower Sprinkler

2020 ◽  
Vol 24 (1) ◽  
pp. 4-8 ◽  
Author(s):  
A.V. Dmitriev ◽  
I.N. Madyshev ◽  
O.S. Dmitrieva
Keyword(s):  
Mass Transfer ◽  
Experimental Study ◽  
Heat And Mass Transfer ◽  
Hydraulic Resistance ◽  
Thermal Efficiency ◽  
Cooling Tower ◽  
Air Velocity ◽  
Contact Devices ◽  
Cooling Technology ◽  
Transfer Parameters

The scheme of cooling tower operation with non-contact evaporative cooling technology is presented. A new design of the cooling tower sprinkler unit consisting of inclined-corrugated contact devices has been developed. The structure contains a system of pipes through which the flow of water moves without contacting the air. Studies have been carried out to determine the hydraulic resistance of inclined-corrugated contact elements with changes in air velocity and irrigation density. Thermal efficiency in a cooling tower with inclined-corrugated contact elements can reach 33 %.

Performance analysis of domestic solar air heating system using V-shaped baffles – An experimental study

2021 ◽  
pp. 095440892110162
Author(s):  
Vijayakumar Rajendran ◽  
Harichandran Ramasubbu ◽  
Karthick Alagar ◽  
Vignesh Kumar Ramalingam
Keyword(s):  
Experimental Study ◽  
Performance Improvement ◽  
Mass Flow ◽  
Thermal Efficiency ◽  
Heating System ◽  
Solar Air Heater ◽  
Absorber Plate ◽  
Air Heating ◽  
Mass Flow Rates ◽  
Carbon Dioxide Mitigation

An experimental study has been carried out to enhance a solar air heater’s performance by integrating artificial roughness through baffles on the absorber plate. In this paper, the thermal and energy matrices analysis of a Solar Air Heater (SAH) roughened with V up perforated baffles have been investigated. The effect of various mass flow rates on the SAH was analyzed with and without baffles. Experimental outputs like outlet air temperature, useful energy (heat) gain and thermal efficiency were evaluated to confirm the performance improvement. The baffled absorber plate SAH was found to give the maximum thermal efficiency and useful energy gain of 89.3% and 1321.37 W at a mass flow rate of 0.0346 kg/s, 13% and 12% higher than SAH without baffle. This result showed that the V up-shaped ribs in flow arrangement provide better thermal performance than smooth plate SAH for the parameter investigated. Energy matrices analysis and carbon dioxide mitigation of the SAH system were also analyzed.

Experimental study on the long-term stability of shale rock wellbore under high hydraulic pressure

2021 ◽  
Vol 14 (3) ◽  
Author(s):  
Baoyun Zhao ◽  
Xiaoping Wang ◽  
Wei Huang ◽  
Tianzhu Huang ◽  
Yang Liu
Keyword(s):  
Experimental Study ◽  
Hydraulic Pressure ◽  
Term Stability ◽  
Long Term Stability ◽  
Shale Rock

scholarly journals Atmospheric Thermal and Dynamic Vertical Structures of Summer Hourly Precipitation in Jiulong of the Tibetan Plateau

Atmosphere ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 505
Author(s):  
Yonglan Tang ◽  
Guirong Xu ◽  
Rong Wan ◽  
Xiaofang Wang ◽  
Junchao Wang ◽  
...  
Keyword(s):  
Wind Speed ◽  
Tibetan Plateau ◽  
Precipitation Amount ◽  
Summer Precipitation ◽  
The Tibetan Plateau ◽  
Hourly Precipitation ◽  
Air Convection ◽  
Precipitation Variation ◽  
Long Term Observation

It is an important to study atmospheric thermal and dynamic vertical structures over the Tibetan Plateau (TP) and their impact on precipitation by using long-term observation at representative stations. This study exhibits the observational facts of summer precipitation variation on subdiurnal scale and its atmospheric thermal and dynamic vertical structures over the TP with hourly precipitation and intensive soundings in Jiulong during 2013–2020. It is found that precipitation amount and frequency are low in the daytime and high in the nighttime, and hourly precipitation greater than 1 mm mostly occurs at nighttime. Weak precipitation during the daytime may be caused by air advection, and strong precipitation at nighttime may be closely related with air convection. Both humidity and wind speed profiles show obvious fluctuation when precipitation occurs, and the greater the precipitation intensity, the larger the fluctuation. Moreover, the fluctuation of wind speed is small in the morning, large at noon and largest at night, presenting a similar diurnal cycle to that of convective activity over the TP, which is conductive to nighttime precipitation. Additionally, the inverse layer is accompanied by the inverse humidity layer, and wind speed presents multi-peaks distribution in its vertical structure. Both of these are closely related with the underlying surface and topography of Jiulong. More studies on physical mechanism and numerical simulation are necessary for better understanding the atmospheric phenomenon over the TP.

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