Experimental study on the influence of input solar flux, air flow rate, and absorber parameters on honeycomb ceramic air receiver performance

2020 ◽  
Vol 12 (2) ◽  
pp. 023701 ◽  
Author(s):  
Qing Li ◽  
Qianjun Zhang
Keyword(s):  
Experimental Study ◽  
Flow Rate ◽  
Air Flow ◽  
Solar Flux ◽  
Air Flow Rate ◽  
Receiver Performance ◽  
Honeycomb Ceramic

scholarly journals Experimental study on the performance of flat air collector with reticulated endothermic body

2020 ◽  
Vol 165 ◽  
pp. 01025
Author(s):  
Liang Hong ◽  
Han Zhiguo ◽  
Wang Jing ◽  
Duli Kunjiang ◽  
Li Zhiyong
Keyword(s):  
Experimental Study ◽  
Flow Rate ◽  
Temperature Difference ◽  
Collection Efficiency ◽  
Air Flow ◽  
Wire Mesh ◽  
Pore Density ◽  
Air Flow Rate ◽  
Flow Temperature ◽  
Mesh Density

Because the flat air collector is simple in structure, reliable in operation, and resistant to cold and frost, it is more suitable for applications such as building heating. This paper presents a flat air collector with a mesh heat sink, and analyzes the effects of air flow, temperature difference between inlet and outlet, and wire mesh density on the heat collection efficiency of the collector. The results show that when the pore density is fixed, the heat collection efficiency increases with the increase of air flow rate, which is 10% higher than that of natural convection when the air flow rate is maximum; when the air flow rate is fixed, the heat collection efficiency increases with the increase of the pore density and the temperature difference between the inlet and outlet, which can be increased by 10% -20%.

Experimental Study on MPS-HP-II Medium Speed Mills Applied on Unite Using High-Moisture Contained Coal

2013 ◽  
Vol 437 ◽  
pp. 388-393
Author(s):  
Ke Sun ◽  
Shi Qi Jin ◽  
Da Chuan Qin
Keyword(s):  
Experimental Study ◽  
Flow Rate ◽  
Power Plants ◽  
Air Flow ◽  
Load Force ◽  
Air Flow Rate ◽  
High Moisture ◽  
Medium Speed ◽  
New Type ◽  
Proper Operation

As a new type miller imported from Germany Company Babcock, MPS-HP-II becoming more and more popular because of its outstanding performance in grinding high moisture contained coal. But in daily operation in power plants, the operators encounter with many problems, such as a lack of output, and difficulties in finding proper operation point. In this paper, a we put up with a proper way to calculate the max output of MPS-HP-IImiller, which is demonstrated by experiment. Also we find the optimized working point of MPS-HP-IImiller by analysing the experiment result got by changing the primary air flow rate, separator angel, output and load force.

scholarly journals Model of thermal buoyancy in cavity-ventilated roof constructions

2021 ◽  
pp. 174425912098418
Author(s):  
Toivo Säwén ◽  
Martina Stockhaus ◽  
Carl-Eric Hagentoft ◽  
Nora Schjøth Bunkholt ◽  
Paula Wahlgren
Keyword(s):  
Analytical Model ◽  
Flow Rate ◽  
Numerical Study ◽  
Air Flow ◽  
Wind Pressure ◽  
Air Flow Rate ◽  
Test Set ◽  
Air Cavity ◽  
Thermal Buoyancy ◽  
The Impact

Timber roof constructions are commonly ventilated through an air cavity beneath the roof sheathing in order to remove heat and moisture from the construction. The driving forces for this ventilation are wind pressure and thermal buoyancy. The wind driven ventilation has been studied extensively, while models for predicting buoyant flow are less developed. In the present study, a novel analytical model is presented to predict the air flow caused by thermal buoyancy in a ventilated roof construction. The model provides means to calculate the cavity Rayleigh number for the roof construction, which is then correlated with the air flow rate. The model predictions are compared to the results of an experimental and a numerical study examining the effect of different cavity designs and inclinations on the air flow rate in a ventilated roof subjected to varying heat loads. Over 80 different test set-ups, the analytical model was found to replicate both experimental and numerical results within an acceptable margin. The effect of an increased total roof height, air cavity height and solar heat load for a given construction is an increased air flow rate through the air cavity. On average, the analytical model predicts a 3% higher air flow rate than found in the numerical study, and a 20% lower air flow rate than found in the experimental study, for comparable test set-ups. The model provided can be used to predict the air flow rate in cavities of varying design, and to quantify the impact of suggested roof design changes. The result can be used as a basis for estimating the moisture safety of a roof construction.

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