A Novel Free-Cooling Scheme for Combustion Turbine Inlet Air Cooling

2008 ◽  
Vol 130 (1) ◽  
Author(s):  
Montaser M. Zamzam ◽  
Abdalla M. Al-Amiri
Keyword(s):  
Cooling Tower ◽  
Cold Water ◽  
Water Circulation ◽  
Circulation Loop ◽  
Secondary Source ◽  
Air Cooling ◽  
Cooling Mode ◽  
Turbine Inlet ◽  
Free Cooling ◽  
Cooling Coils

Free cooling is a well-known concept in the HVAC industry in which the cold water produced by a cooling tower is used directly to satisfy the requirement of the cooling load without assistance by the chiller; this concept, however, is not reported in the turbine inlet air-cooling applications. Free cooling works well as long as the ambient wet bulb temperature (WBT) is sufficiently low to produce cold water at the required temperature, but once WBT reaches its threshold value (hence, free-cooling mode is ceased) and the chiller kicks off working under its normal mode of operation, i.e., free cooling is either enabled or disabled. The proposed system in this paper provides, in addition to the above modes of operation, a novel mode that utilizes the cooling tower as a primary source of cooling simultaneously with the chiller that serves as a secondary source at elevated WBT. This new feature significantly reduces the yearly operating hours of the chiller and possibly its size, depending on the desired inlet air temperature, actual weather conditions, and design WBT. Chiller size can vary between 0% and 100% as compared to a similar classical chiller system with significant reduction in the operating hours. The proposed system consists basically of chiller, cooling tower, cooling coils, interconnecting piping, and controls. The arrangement of the system equipment changes with the operation modes in two configurations: dual water circulation loops and single water circulation loop. In the dual-loop configuration, the system has two separate loops such that the evaporator and the cooling coils are tied in one loop, while the cooling tower and condenser in the other loop; whereas in the single-loop configuration, all equipment is connected in series in one water circulation loop. This paper presents the major equipment and characteristics of the novel chiller scheme. In addition, the study outlines the potential reduction in the chiller load, size, and operating hours under a generalized weather envelope. The paper portrays the feasibility of using the proposed cooling scheme for turbine inlet air cooling.

A Novel Free-Cooling Scheme for Combustion Turbine Inlet Air Cooling

2007 ◽  
Author(s):  
Montaser M. Zamzam ◽  
Abdalla M. Al-Amiri
Keyword(s):  
Cooling Tower ◽  
Cold Water ◽  
Water Circulation ◽  
Circulation Loop ◽  
Secondary Source ◽  
Air Cooling ◽  
Cooling Mode ◽  
Turbine Inlet ◽  
Free Cooling ◽  
Cooling Coils

Free-cooling is a well-known concept in the HVAC industry in which the cold water produced by cooling tower is used directly to satisfy the requirement of the cooling load without assistance by the chiller, this concept, however, is not reported in the turbine inlet air cooling applications. Free-cooling works well as long as the ambient wet bulb temperature WBT is sufficiently low to produce cold water at the required temperature but once WBT reaches its threshold value hence free-cooling mode is ceased and the chiller kicks off working under its normal mode of operation i.e. free-cooling is either enabled or disabled. The proposed system in this paper provides in addition to the above modes of operation a novel mode that utilizes the cooling tower as primary source of cooling simultaneously with the chiller which serves as a secondary source at elevated WBT. This new feature significantly reduces the yearly operating hours of the chiller and possibly its size depending on the desired inlet air temperature, actual weather conditions and design WBT. Chiller size can vary between 0-100 percent as compared to a similar classical chiller system with significant reduction in the operating hours. The proposed system basically consists of chiller, cooling tower, cooling coils, interconnecting piping and controls. The arrangement of the system equipments changes with the operation modes in two configurations; dual water circulation loops and single water circulation loop. In the dual loops configurations the system has two separate loops such that the evaporator and the cooling coils are tied in one loop while the cooling tower and condenser in the other loop whereas in the single loop configuration all equipments are connected in series in one water circulation loop. This paper presents the major equipments and characteristics of the novel chiller scheme. In addition, the study outlines the potential reduction in the chiller load, size and operating hours under a generalized weather envelope. The paper in general portrays the feasibility of using the proposed cooling scheme for turbine inlet air cooling.

The Rod Force Law Analysis of 600MW Air Cooling Tower

2014 ◽  
Vol 945-949 ◽  
pp. 1135-1138
Author(s):  
Tao Liang ◽  
Chun Ling Meng ◽  
Yang Li ◽  
Xiu Hua Zhao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Axial Force ◽  
Optimization Design ◽  
Cooling Tower ◽  
Air Cooling ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
The Cost

The finite element analysis of large air cooling tower was carried out using ABAQUS. On the basis of strength above,8 types of the axial force are analyzed and summarized, find valuable rules, and put forward the further optimization design. So that it can satisfy the strength and stability of air cooling tower, the structure is more reasonable, reduce weight, reduce the cost.

Experimental and Theoretical Studies on Performance of GSHP Combined with Free Cooling System

2013 ◽  
Vol 368-370 ◽  
pp. 1232-1236
Author(s):  
Wei Xue Cao ◽  
Ru Chang ◽  
Can Zhang ◽  
Qiu Li Zhang
Keyword(s):  
Cooling Tower ◽  
Cooling System ◽  
Meteorological Parameter ◽  
Economic Benefits ◽  
Ground Source Heat Pump ◽  
Combined System ◽  
Climate Zones ◽  
Ground Source ◽  
Free Cooling ◽  
Experimental And Theoretical Studies

Ground-Source Heat Pump systems and tower cooling system have been studied in this paper individually by experiment and simulation using TRNSYS, the influencing factors such as meteorological parameter, cooling tower and subunit construction was analyzed. Results show that the combined system has ability to meet the cooling requirements in II building climate zones, the combined system will have energy-saving and obvious economic benefits by working through the year.

Long-Life Base Load Service at 1600 F Turbine Inlet Temperature

1967 ◽  
Vol 89 (1) ◽  
pp. 41-46 ◽  
Author(s):  
N. E. Starkey
Keyword(s):  
Inlet Temperature ◽  
Air Cooling ◽  
Turbine Inlet Temperature ◽  
Fuel Distribution ◽  
Design Considerations ◽  
Turbine Inlet ◽  
Accurate Temperature ◽  
Long Life ◽  
Accurate Temperature Control ◽  
Base Load

Design considerations required for base load long-life service at turbine inlet temperature above 1600 F are discussed. These include control of combustion profile, air cooling of the first-stage nozzle, long-shank turbine buckets, accurate air and fuel distribution, and accurate temperature control.

Numerical Simulation of Intermediate Cooling Temperature Field in Controlled Rolling

2010 ◽  
Vol 148-149 ◽  
pp. 359-362
Author(s):  
Wen Feng Huo ◽  
Xian Lei Hu ◽  
Bing Xing Wang ◽  
Xiang Hua Liu
Keyword(s):  
Cooling Rate ◽  
Controlled Rolling ◽  
Holding Time ◽  
Air Cooling ◽  
Thickness Direction ◽  
Cooling Mode ◽  
Cooling Strategy ◽  
Profile Characteristics ◽  
Intermediate Cooling ◽  
Rolling Efficiency

Air cooling may decrease rolling efficiency in controlled rolling for needing long holding time to obtain the correct rolling temperature because of small cooling rate. The intermediate cooling can increate the cooling rate, and improve rolling efficiency. Experiment was carried out to research the effect of intermediate cooling on rolling efficiency. The influence of different cooling mode on the temperature distribution and the temperature profile characteristics of different cooling strategy are analyzed with FEM. It shows that intermediate cooling can decrease the holding time effectively, and improve rolling efficiency; the temperature homogeneity in thickness direction can be improved by opening the header one after another and cooling the plate by oscillating cooling.

Field experience of UHPFRC durability in an air cooling tower

2010 ◽  
pp. 727-734
Author(s):  
F Toutlemonde ◽  
V Bouteiller ◽  
A Deman ◽  
G Platret ◽  
A Pavoine ◽  
...  
Keyword(s):  
Field Experience ◽  
Cooling Tower ◽  
Air Cooling

Brayton refrigeration cycle for gas turbine inlet air cooling

2007 ◽  
Vol 31 (13) ◽  
pp. 1292-1306 ◽  
Author(s):  
Galal M. Zaki ◽  
Rahim K. Jassim ◽  
Majed M. Alhazmy
Keyword(s):  
Gas Turbine ◽  
Air Cooling ◽  
Refrigeration Cycle ◽  
Turbine Inlet ◽  
Brayton Refrigeration Cycle

The Use of Ejector Refrigeration Systems for Turbine Inlet Air Cooling: A Thermodynamic and CFD Study

2007 ◽  
Author(s):  
Hany A. Al-Ansary
Keyword(s):  
Power Consumption ◽  
Power Output ◽  
Waste Heat ◽  
Evaporative Cooling ◽  
Published Data ◽  
Air Cooling ◽  
Refrigeration System ◽  
Compressor Blades ◽  
Cooling Systems ◽  
Turbine Inlet

Cooling turbine inlet air is a proven method of increasing turbine power output, especially during peak summer demand. It is estimated that turbine power output can increase by as much as 0.7% for every 1°C drop in inlet air temperature. Two inlet air cooling systems are widely used: evaporative cooling systems and chiller systems. Evaporative cooling is economical and uncomplicated, but its efficiency can significantly drop if the relative humidity is high. There is also a potential for excessive wear of compressor blades if water droplets are carried into the compressor section. On the other hand, chiller systems have the advantage of being independent of humidity and do not have the potential to cause damage to compressor blades. However, chiller systems consume power and cause a larger pressure drop than evaporative coolers. In this work, the possibility of using an ejector refrigeration system to cool turbine inlet air is explored. These systems are low-maintenance, fluid-driven, heat-operated devices that can use part of the turbine exhaust flow as the heat source for running the cycle. These systems require only pump power to feed liquid refrigerant to the vapor generator, making the power consumption potentially lower than conventional chiller systems. Using thermodynamic analysis, this paper compares the performance of ejector refrigeration systems with that of chiller systems based primarily on their power consumption. Performance characteristics for the ejector system are obtained through a CFD model that uses a real-gas model for R-134a. Published data on the performance of a commercial gas turbine is also considered. The power consumption of ejector refrigeration systems is found to be significantly smaller than that of vapor compression systems, with savings ranging from 19% to 80%. Power consumption is also found to be small compared to the boost in turbine power that is obtained. The percentage of waste heat needed to operate the ejector refrigeration system is found to be generally less than 25%.

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