Performance enhancement of cooling towers in thermal power plants through energy conservation

Mandi, Rajashekar P.; Hegde, R.K.; Sinha, Shahnawaz

doi:10.1109/ptc.2005.4524607

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…where _ m a denotes the mass flow rate of the humid air through the CT and CTF is the CT fan efficiency (which lies between 71 and 81%). 35,45 Traditionally, the CT fan power for each CT cell of a 500 MW e power plant is $90 kW, and there are 16 CT cells in each CT. 34 For ¼ 45 orientation (Figure 8), it is ¼ 15 for orientation P1-the mesh installation with the highest coll , the Áp $ 6.73 Pa corresponding to an additional fan power of 4.22 kW per CT cell (i.e. additional power consumed is 67.46 kW for the 16 CT cells, see Table 2), which is only $4.7% of the CT fan power.…”

Section: Aerodynamic Efficiencymentioning

confidence: 99%

Fog harvesting from cooling towers using metal mesh: Effects of aerodynamic, deposition, and drainage efficiencies

Ghosh

Ganguly

2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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Fog harvesting is recognized as an important alternate source of fresh water. Industrial fog can supplement water for industrial requirement. Collection of fog (drift droplets) from cooling tower plumes is a viable mode of industrial fog harvesting. The present study delves deeper into the findings of our earlier pilot investigation, on cooling tower fog harvesting and unravels how the collection efficiency depends on interaction of the mesh with the oncoming flow and the deposited fog droplets. Herein, we quantify the fog collection and explain the rationale of the individual contributions of aerodynamic, deposition, and drainage efficiencies on the overall collection efficiency. The effect of the mesh orientations and the tangential velocity component of the cooling tower plume (arising out of the cooling tower-fan rotation) are considered. Aerodynamic efficiency of the mesh and pressure drop across is estimated through computational fluid dynamic analysis. Also, an analysis of the force interaction between the mesh wires, deposited droplet, and the fog stream is carried out to identify the salient deterring factors like re-entrainment, clogging, and premature dripping of collected water droplets, based on which the regime of collection is mapped. The best collection configuration is found at an inclination of 15° with the vertical, with an overall collection efficiency of about 16%. The best configuration would allow recovery of re-usable fresh water at a nominal energy penalty of ∼3.9 kWh/m3. Our results offer the design bases for developing full-scale fog harvesting setups for industrial cooling towers.

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Section: Aerodynamic Efficiencymentioning

confidence: 99%

Fog harvesting from cooling towers using metal mesh: Effects of aerodynamic, deposition, and drainage efficiencies

Ghosh

Ganguly

2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…In the literature several definitions are used for effectiveness, but they are specific to certain boundary conditions and configuration. An equation used by [9], which was based on the work of [R. P. Mandi,. 2005], was not robust and not applicable to a large class of heat and mass transfer exchanger devices.…”

Section: • Compressormentioning

confidence: 99%

Thermodynamic performance evaluation of HFC refrigerants for the chiller system simulated by hot gas bypass cycle

2017

ZJPAS

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The competitive of the building airconditioning equipment pushes manufactures to develop and improve the performance and efficiency of their products. This process is cost and time consuming for testing the whole units. In this study, for the first time a modified proposed test block with hot gas bypass cycle (HGBP), based on the experimental compressor map, has been used as a model to investigate the theoretical performance of the chiller system. The model assumes one dimensional steady state conditions and uses an experimental compressor map to predict the thermodynamic performance of the system. A computational model, using the software program EES (EES-V8.4), in a single stage of the chiller system with HGBP cycle based on the first and second law analyses are presented for the prediction of the effects of the pressure ratio, degree of superheating and sub-cooling, condenser temperature, outdoor air temperature and humidity ratio on the exergy destruction, exergetic efficiency, gas power and coefficient of performance (COP) of the chiller system. The performance of the implemented model with various hydrofluorocarbon (HFC) refrigerants such as R134a, R152a and R423a are compared. The results, firstly, indicates that the modified model with applying the energy and exergy analysis works for all kind of working refrigerants including HFC refrigerants. Secondly, the performance of the compression refrigeration system based on the experimental compressor map data to choose the right compressor can help engineers to design a high quality unit before going to design the system practically. The results indicate that R423a has a higher coefficient of performance as compared to the rest of the refrigerants. The developed simulation model helped to establish the strong dependence between system performances and the compressor map.

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“…For example, the thermal performance of cooling towers is critical to the overall performance of steam or combined cycle power plants in which they are used (Mandi et al, 2005;Tawney et al, 2005). For analysis and optimization of cycles containing these components, defining an effectiveness to characterize their performance has considerable advantages (Mistry et al, 2010;Narayan et al, 2010b,c).…”

Section: Introductionmentioning

confidence: 99%

“…In cooling tower literature (Cheremisinoff and Cheremisinoff, 1981;Mandi et al, 2005), an effectiveness is commonly defined based on the temperature change of one of either the air or the water streams, typically, the change in water temperature. This definition can also be written using terminology commonly used in cooling towers: (a) Range, the change in water temperature between the inlet and the outlet; and (b) Approach, the difference between the water exit temperature and the inlet air wet-bulb temperature:…”

Section: Introductionmentioning

confidence: 99%

Energy Effectiveness of Simultaneous Heat and Mass Exchange Devices

Narayan¹,

Mistry²,

Sharqawy³

et al. 2010

Frontiers in Heat and Mass Transfer

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Simultaneous heat and mass exchange devices such as cooling towers, humidifiers and dehumidifiers are widely used in the power generation, desalination, air conditioning, and refrigeration industries. For design and rating of these components it is useful to define their performance by an effectiveness. In this paper, several different effectiveness definitions that have been used in literature are critically reviewed and an energy based effectiveness which can be applied to all types of heat and mass exchangers is defined. The validity and the limitations of the various effectiveness definitions are demonstrated by way of several examples including direct and indirect contact, parallel and counterflow heat and mass exchangers. The limiting case of a simple heat exchanger is also discussed. The importance of thermal balancing in minimizing entropy production and its implications for optimization and design of these devices is dealt with in detail. The application of the energy effectiveness to heat-exchanger-like ε-NTU correlations is also examined using a detailed numerical model.

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Performance enhancement of cooling towers in thermal power plants through energy conservation

Cited by 7 publications

References 2 publications

Fog harvesting from cooling towers using metal mesh: Effects of aerodynamic, deposition, and drainage efficiencies

Fog harvesting from cooling towers using metal mesh: Effects of aerodynamic, deposition, and drainage efficiencies

Thermodynamic performance evaluation of HFC refrigerants for the chiller system simulated by hot gas bypass cycle

Energy Effectiveness of Simultaneous Heat and Mass Exchange Devices

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