Combined evaporative air cooler and refrigeration unit for water purification and performance enhancement of air cooling system

This paper summarizes the experiences with the first gas turbine inlet air cooling project in Saudi Arabia. It will cover the feasibility study, cooling system options, overview, system equipment description, process flow diagram, construction, commissioning, start-up and performance of the project which is currently under commissioning and initial start up at Qassim Central Power Plant (QCPP) owned by Saudi Electric Company (S.E.C.) Central Region Branch.

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Assessments of High-Efficient Regenerative Evaporative Cooler Effects on Desiccant Air Cooling Systems

Journal of Energy Resources Technology ◽

10.1115/1.4046523 ◽

2020 ◽

Vol 142 (7) ◽

Author(s):

Hakan Caliskan ◽

Dae-Young Lee ◽

Hiki Hong

Keyword(s):

Cooling System ◽

Dew Point ◽

Air Cooling ◽

Sensible Heat ◽

Cooling Systems ◽

High Efficient ◽

Air Cooling System ◽

Evaporative Cooler ◽

Effectiveness And Efficiency ◽

And Performance

Abstract In this paper, the effects of regenerative evaporative coolers on the dry desiccant air cooling system are assessed. Thermodynamic analysis is performed point by point on the unmodified (ɛ = 0.67) and modified (ɛ = 1) regenerative evaporative cooler supported systems. It is found that the effectiveness and efficiency of the system were significantly increased by modification. Effectiveness of the system increases from 0.95 to 2.16 for the wet bulb and from 0.63 to 1.43 for dew point effectivenesses, while the exergy efficiency increases from 18.40% to 41.93%. Exergy and energy performances of the system increase 1.28 times and 0.61 times, respectively. Finally, sustainability is increased by 40% with the modification of the regenerative evaporative cooler. Also, changing the regenerative evaporative cooler of the solid desiccant wheel with the effective one can increase the overall system efficiency and performance without changing the sensible heat and desiccant wheels.

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Control of BLDC Motor Air Cooler for Low Voltage DC House

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.k1396.0981119 ◽

2019 ◽

Vol 8 (11) ◽

pp. 455-458

Keyword(s):

Distribution System ◽

Low Voltage ◽

Cooling System ◽

Volume Ratio ◽

Air Cooling ◽

Bldc Motor ◽

Cooling Systems ◽

Brushless Dc ◽

Air Cooling System ◽

Air Cooler

Recent power sector targets on cleaner and sustainable generation and distribution system. This can be done by improving DC based applications for low voltage DC residential homes. During summer air cooling systems are very much useful in reducing the room temperature. Brushless-DC (BLDC) motors are best suited these days as electric motors of fans and air cooling systems with very low power utilization and many other reasons like lesser maintenance, compact and huge gain of torque to volume ratio etc., the control of BLDC motor classified mainly of two types sensor scheme and sensor-less schemes. This paper presents simulation and analysis of two control schemes for BLDC motor drive for air cooling system. The BLDC drive system was developed in MATLAB for both sensor and sensor-less schemes and simulated for different loading conditions.

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Performance Improvements of a Natural Gas Injection Station Using Gas Turbine Inlet Air Cooling

Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations ◽

10.1115/97-gt-508 ◽

1997 ◽

Cited By ~ 7

Author(s):

Maurizio De Lucia ◽

Ennio Carnevale ◽

Massimo Falchetti ◽

Alberto Tesei

Keyword(s):

Gas Turbine ◽

Performance Enhancement ◽

Cooling System ◽

Lithium Bromide ◽

Capital Outlay ◽

Air Cooling ◽

Cooling Systems ◽

Performance Improvements ◽

Turbine Inlet ◽

Air Cooling System

Gas Turbine (GT) performance seriously deteriorates at increased ambient temperature. This study analyses the possibility of improving GT power output and efficiency by installing a gas turbine inlet air cooling system. Different cooling systems were analyzed and preliminary cost evaluations for each system were carried out. The following three cooling systems were considered in detail: a) Traditional compression cooling system; b) Absorption single-acting cooling system using a solution of lithium bromide; c) Absorption double-acting cooling system using a solution of lithium bromide. Results clearly indicate that there is a great potential for GT performance enhancement by application of an Inlet Air Cooling (IAC). Technical and economical analyses lead to selection of a particular type of IAC for significant savings in capital outlay, operational and maintenance costs and other additional advantages.

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IMPROVING THE CLEANING EFFICIENCY OF THE DIESEL ENGINE PURGE AIR COOLER

Scientific Bulletin Kherson State Maritime Academy ◽

10.33815/2313-4763.2020.1.22.120-130 ◽

2020 ◽

Vol 1 (22) ◽

pp. 120-130

Author(s):

O. E. Samarin ◽

◽

R. Ye. Vryblevskiy

Keyword(s):

Diesel Engine ◽

Cooling System ◽

Air Cooling ◽

Cleaning Efficiency ◽

Cleaning Procedure ◽

Air Cooling System ◽

Air Cooler ◽

Cooling Element ◽

Mechanical Cleaning ◽

Engine Power

In order to increase the mass of the air charge, one has to increase its density. Therefore, the density of the air may be increased by increasing the air pressure and reducing its temperature. The temperature of the purge air is being decreased in the air cooler. With the lapse of time, its performance efficiency drops due to the contaminant pollution of heat transfer elements, which as a consequence, leads to the diesel engine power reduction. The established procedure for cleaning the air cooler does not ensure a complete cleaning of heat exchangers, especially in hard-to-reach places, and manual mechanical cleaning is rather time consuming and requires engine cutoff over a protracted period of time. Thus, improving the efficiency and simplifying the complexity of the air cooler cleaning procedure is considered to be an urgent task to complete. In order to reduce those shortcomings, the modernization of the air cooler cleaning system is being considered. The upgrade being suggested involves an installation of auxiliary atomizing devices on both sides of the cooling element, i.e., in those places where the air cooler is being polluted the most. The purge air temperature increase leads to a decrease in the engine power, increased fuel consumption and accumulation of deposits in the exhaust manifold and flue pass, which consequently may contribute to a spontaneous combustion. Taking into consideration the demand for regular cleaning procedure of the cooling element, the serial system is time consuming. In addition to cleaning by means of atomizers, it also involves systematic disassembly of the cooler and manual cleaning of the elements. The modernization being suggested allows to increase the cleaning efficiency of the blower air cooler of the diesel engine by installing additional atomizers of detergent near the side surfaces of the cooling element. Modernization procedure is not a complicated one and its implementation is possible on existing vessels by the engine crew taking into account the necessity of a long-term stopover of the vessel for maintenance and repair. The solution is universal and may be implemented on ships with the gas-turbocharged engines with purge air cooling system. The application of an upgraded system will also reduce the complexity of the cleaning procedure of the air cooler cooling elements by avoiding manual mechanical cleaning of hard-to-reach cooling surfaces.

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Important Parameters and Performance Testing of Evaporative Inlet Air Cooling System for Gas Turbines: A User’s Experience

Volume 4: Cycle Innovations; Electric Power; Industrial and Cogeneration; Manufacturing Materials and Metallurgy ◽

10.1115/gt2006-90744 ◽

2006 ◽

Author(s):

Hemant Gajjar

Keyword(s):

Gas Turbine ◽

Gas Turbines ◽

Cooling System ◽

Low Cost ◽

Evaporative Cooling ◽

Performance Testing ◽

Air Cooling ◽

Air Cooling System ◽

Evaporative Cooling System ◽

And Performance

Inlet Air Cooling of gas turbine engines for power augmentation has seen increasing application over the past decade. Evaporative inlet air cooling has been particularly preferred by the Gas Turbine operators due to its low cost and ease of installation. Two of the important considerations for a GT operator are the proper selection of the EIAC and, after installation, its proper testing to assure required performance. This paper is based on the experience, as a user, of selecting a inlet air cooling system and then implementing a Fogging type Evaporative Cooling system. It highlights the important parameters related to evaporative cooling system and in particular fogging, and how the site testing can be handled to ensure proper performance. Concepts of ‘Conversion Effectiveness’ and ‘Evaporation Effectiveness’ have also been introduced in this paper.

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Application of Cold Water Spray in Mine Heat Hazard Control

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.71-78.2375 ◽

2011 ◽

Vol 71-78 ◽

pp. 2375-2381 ◽

Cited By ~ 1

Author(s):

Cong Guang Jian ◽

Wei Su ◽

Hui Zhang ◽

Fang Yang

Keyword(s):

Cold Water ◽

Cooling System ◽

Air Cooling ◽

Water Spray ◽

Hazard Control ◽

Refrigeration Unit ◽

Transmission Pipeline ◽

Air Cooling System ◽

Mining Face ◽

Heat Hazard

For the growing problem of mine heat hazard in the deep mining, this paper mainly studies the heat source and the rock temperature variation of the fifth mining in Pingdingshan. An air cooling system is designed using the low-temperature water spray, which operates as follows: the cryogenic water prepared by refrigeration unit is transported through the transmission pipeline to the cooler installed in the working face for cooling of the air flow; then the return water is transported back into the refrigeration unit for re-refrigeration cycle; the condensing heat which is generated by refrigeration unit is discharged by water spray in the shaft of Beishan, which is an effective solution to condensation heat emissions underground. To avoid the phenomenon of "uneven heat distribution with higher temperature on the upper position" during the long face cooling, the upper part of Mining Face is cooled by cold water spray shower, which is proved effective. Without the water spray working the temperature at the upper outlet of the mining face dropped by 2.8°C; and with the water spray working the working condition is improved by the temperature dropping for 4.8°Cat the upper outlet of the mining face while 4°Con the whole mining face and the air humidity content decreasing about 6 g / kg (DA). The research in this paper supplies valuable reference for the heat hazard control and recycling of mine wastewater.

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Upgrade of the Intake Air Cooling System for a Heavy-Duty Industrial Gas Turbine

Volume 4: Cycle Innovations; Fans and Blowers; Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Marine; Oil and Gas Applications ◽

10.1115/gt2011-45398 ◽

2011 ◽

Cited By ~ 1

Author(s):

Steve Ingistov ◽

Mustapha Chaker

Keyword(s):

Gas Turbines ◽

Cooling System ◽

Air Cooling ◽

Heavy Duty ◽

Ambient Conditions ◽

Fog Water ◽

Media Type ◽

Air Cooling System ◽

Evaporative Cooling System ◽

And Performance

This paper describes continued efforts, spanning over number of years at the Watson Cogeneration plant located in Carson California, to improve the intake air cooling system in enhancing power output and performance of the four existing heavy-duty GE 7EA gas turbines. In early 2010, a decision was made to remove the media-type evaporative cooling system from one of the GT units (Unit #4) and rely completely on the high pressure fogging system to cool the compressor inlet air for power augmentation. The reasons and the efforts made for modifying the intake air system are elaborated in this paper including discussion on the results obtained due to implemented changes. Steam turbine condensate at 49 °C is utilized as the fogging water in contrast to the commonly used demineralized water at the ambient conditions. A discussion on the implication of using high temperature fog water is included here.

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Air circulation in a gastrointestinal light source box and endoscope in the era of SARS-CoV-2 and airborne transmission of microorganisms

Endoscopy International Open ◽

10.1055/a-1336-3280 ◽

2021 ◽

Vol 09 (03) ◽

pp. E482-E486

Author(s):

Stanislas Chaussade ◽

Einas Abou Ali ◽

Rachel Hallit ◽

Arthur Belle ◽

Maximilien Barret ◽

...

Keyword(s):

Light Source ◽

Cooling System ◽

Air Cooling ◽

Airborne Transmission ◽

Plastic Tube ◽

Care Workers ◽

Air Cooling System ◽

Forced Air ◽

Air Circulation ◽

Closed Environment

Abstract Background and study aims The role that air circulation through a gastrointestinal endoscopy system plays in airborne transmission of microorganisms has never been investigated. The aim of this study was to explore the potential risk of transmission and potential improvements in the system. Methods We investigated and described air circulation into gastrointestinal endoscopes from Fujifilm, Olympus, and Pentax. Results The light source box contains a lamp, either Xenon or LED. The temperature of the light is high and is regulated by a forced-air cooling system to maintain a stable temperature in the middle of the box. The air used by the forced-air cooling system is sucked from the closed environment of the patient through an aeration port, located close to the light source and evacuated out of the box by one or two ventilators. No filter exists to avoid dispersion of particles outside the processor box. The light source box also contains an insufflation air pump. The air is sucked from the light source box through one or two holes in the air pump and pushed from the air pump into the air pipe of the endoscope through a plastic tube. Because the air pump does not have a dedicated HEPA filter, transmission of microorganisms cannot be excluded. Conclusions Changes are necessary to prevent airborne transmission. Exclusive use of an external CO2 pump and wrapping the endoscope platform with a plastic film will limit scatter of microorganisms. In the era of pandemic virus with airborne transmission, improvements in gastrointestinal ventilation systems are necessary to avoid contamination of patients and health care workers.

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