Comments on “Effect of humid air flow rate on the filmwise condensation inside a vertical cooled pipe: numerical and experimental study”

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%.

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Development of a 150kW Microturbine System Which Applies the Humid Air Turbine Cycle

Volume 3: Turbo Expo 2007 ◽

10.1115/gt2007-28192 ◽

2007 ◽

Cited By ~ 8

Author(s):

Susumu Nakano ◽

Tadaharu Kishibe ◽

Hidefumi Araki ◽

Manabu Yagi ◽

Kuniyoshi Tsubouchi ◽

...

Keyword(s):

Flow Rate ◽

Air Flow ◽

Laboratory Evaluation ◽

Air Cooling ◽

Performance Tests ◽

Air Flow Rate ◽

Humid Air ◽

Electrical Efficiency ◽

Air Turbine ◽

Electrical Output

A prototype machine for a next generation microturbine system incorporating a simplified humid air turbine cycle has been developed for laboratory evaluation. Design targets of electrical output were 150 kW and of electrical efficiency, 35% LHV. The main feature of this microturbine system was utilization of water for improved electrical output, as lubricant for bearings and as coolant for the cooling system of the generator and the power conversion system Design specifications without WAC (Water Atomizing inlet air Cooling) and HAT (Humid Air Turbine) were rated output of 129 kW and efficiency of 32.5% LHV. Performance tests without WAC and HAT were done successfully. Electrical output of 135 kW with an efficiency of more than 33% was obtained in the rated load test. Operation tests for WAC and HAT were carried out under the partial load condition as preliminary tests. Water flow rates of WAC were about 0.43 weight % of inlet air flow rate of the compressor and of HAT, about 2.0 weight %. Effects of WAC and HAT were promptly reflected on electrical output power. Electrical outputs were increased 6 kW by WAC and 11kW by HAT, and efficiencies were increased 1.0 pt % by WAC and 2.0 pt % by HAT. Results of WAC and HAT performance tests showed significant effects on the electrical efficiency with an increase of 3.0 point % and electrical output with an increase of 20% by supplying just 2.4 weight % water as the inlet air flow rate of the compressor.

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

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.437.388 ◽

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.

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