scholarly journals Performance Evaluation of a Maisotsenko Cycle Cooling Tower with Uneven Length of Dry and Wet Channels in Hot and Humid Conditions

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8249
Author(s):  
Xuchen Fan ◽  
Xiaofeng Lu ◽  
Jiping Wang ◽  
Zilong Li ◽  
Quanhai Wang ◽  
...  
Keyword(s):  
Cooling Tower ◽  
Cooling Water ◽  
Experimental System ◽  
Cooling Capacity ◽  
Pressure Drops ◽  
Industrial Sectors ◽  
Optimal Value ◽  
Increasing Demand ◽  
And Performance ◽  
The Impact

The use of the Maisotsenko cycle (M-Cycle) in traditional wet cooling towers (TWCTs) has the potential to reduce the costs of electricity generation by cooling water below the inlet air’s wet-bulb temperature. TWCTs cannot provide sufficient cooling capacity for the increasing demand for cooling energy in the power and industrial sectors—especially in hot and wet climates. Due to this fact, an experimental system of an M-Cycle cooling tower (MCT) with parallel counter-flow arrangement fills was constructed in order to provide perspective on the optimal length of dry channels (ldry), thermal performance under different conditions, and pressure drops of the MCT. Results showed that the optimal value of ldry was 2.4 m, and the maximum wet-bulb effectiveness was up to 180%. In addition, the impact of air velocity in wet channels on the pressure drops of the novel fills was also summarized. This study confirms the great potential of using the M-Cycle in TWCTs, and provides a guideline for the industrial application and performance improvement of MCTs.

scholarly journals THE IMPACT ANALYSIS OF MOTIVATION, TRAINING, AND WORK ENVIRONMENT TO NURSES PERFORMANCE IN PATIENT SAFETY

2019 ◽  
Vol 2 (1) ◽  
pp. 54
Author(s):  
Fushen Fushen ◽  
Meylona Verawaty Zendrato
Keyword(s):  
Patient Safety ◽  
Work Environment ◽  
Public Hospital ◽  
Impact Analysis ◽  
Working Environment ◽  
Cross Sectional ◽  
The Public ◽  
Increasing Demand ◽  
And Performance ◽  
The Impact

The development of hospitals in health industry as economic institutions and the establishment of many new hospitals increase the number of nurses needed while the number of nurses produced cannot keep pace with the increasing demand. In hospital services, nurse is the most frequently interacted person with patients and are fully responsible for patient care, including in terms of patient safety. This study aims to obtain empirical evidence about the effect of motivation, training and work environment on the performance of nurses in patient safety in the Public Hospital. Expected output from this study can be used as a reference to determine the policy for nurse management at the hospital. This is a correlational analytic study with a cross-sectional approach and descriptive method of verification. The research was conducted in a Public Hospital in Jakarta. The research sample are 90 nurses working in inpatient wards. The hypothesis of this study were analyzed with path analysis methods. The results of this study showed a significant positive effect between motivation and performance (20.7%), training and performance (21.8%), working environment and performance (20.7%), and the simultaneous influence from motivation, training, and working environment on the performance (63.2% ).

Experimental Research on the Effect of Cross-Wind to Wet-Cooling Tower Performance

2013 ◽  
Vol 860-863 ◽  
pp. 1412-1415
Author(s):  
Qing Yang Wang ◽  
Tian Yu Sun ◽  
Jian Zhang ◽  
Jian Xing Ren
Keyword(s):  
Wind Velocity ◽  
Flow Rate ◽  
Temperature Difference ◽  
Cooling Tower ◽  
Thermal Power ◽  
Water System ◽  
Cooling Water ◽  
Cooling Capacity ◽  
Inlet Temperature ◽  
Circulating Water

Environmental cross-wind has a influence on cooling capacity of wet cooling tower to a great extent in power plant.The variation of circulating-water temperature difference (Δt) and cooling coefficient of efficiency(η) with cross-wind velocity, circulating water inlet temperature and flow rate, are shown under cross-wind conditions, compared with cases without wind. By using experimental platform of cooling water system based on 300MW thermal power unit,it is found that with cross-wind velocity increasing,cooling temperature difference and cooling efficiency decrease first then increase at the knee point when the velocity value is 0.8m/s. In addition, the correlation betweenΔt ,η and parameters,such as circulating-water inlet temperature and flow rate, is derived for cases with windless conditions.

Experimental Study of Foaming Agent Screening and Performance Evaluation of Nitrogen Foam Flooding in Daqing Oilfield

2012 ◽  
Vol 550-553 ◽  
pp. 2873-2877 ◽  
Author(s):  
Jin Sheng Zhao ◽  
Rong Huan Chen ◽  
Zi Qiang Xu
Keyword(s):  
Foam Stability ◽  
Foaming Properties ◽  
Liquid Viscosity ◽  
Foaming Agent ◽  
Nitrogen Foam ◽  
Optimal Value ◽  
And Performance ◽  
The Stability ◽  
Foam Flooding ◽  
The Impact

Through the laboratory experiment, the foaming properties of six kinds of foaming agent was evaluated comprehensively. Through the primary selection, foaming agent concentration selection and salt tolerance evaluation, HY-2 foaming agent was selected in follow-up experiments. The Liquid viscosity effect for foaming performance showed that there exists an optimal value of the liquid viscosity, corresponding to the concentration of foam stabilizing agent should not be less than 700mg/l. The impact of temperature on the performance of foaming agent was mainly on the foam stability, the higher the temperature, the stability of the bubble the worse. Due to the presence of crude oil, foaming volume and stability of the foam appeared a downward trend, the character of which is very advantageous to adjust fluidity difference between the layers of high permeable formation and low permeable formation.

Development of a Comprehensive Simulation Platform to Investigate System Interactions Among Solid-Oxide Fuel Cell, Power-Conditioning Systems, and Application Loads

2003 ◽  
Author(s):  
S. K. Mazumder ◽  
R. Burra ◽  
K. Acharya ◽  
M. R. von Spakovsky ◽  
D. Nelson ◽  
...  
Keyword(s):  
System Level ◽  
Power Conditioning ◽  
Load Variations ◽  
Load Following ◽  
Balance Of Plant ◽  
Local Current ◽  
Critical Issues ◽  
Increasing Demand ◽  
And Performance ◽  
The Impact

SOFC stacks respond quickly to changes in load and exhibit high part- and full-load efficiencies (due to rapid electrochemistry), which is not true for the balance of plant (BOP), where load-following time constants are several orders of magnitude higher. This dichotomy diminishes the reliability and performance of the electrode with increasing demand of load. Because these unwanted phenomena are not well understood, the manufacturers of SOFC use conservative schemes to control stack responses to load variations, which limit the applicability of SOFC systems from a cost standpoint. Thus, a need exists for the synthesis of component- and system-level models of SOFC power-conditioning systems and the development of methodologies for investigating the system-interaction issues (which reduce the lifetime and efficiency of a SOFC) and optimizing the responses of each subsystem. Equally important are “multiresolution” finite-element modeling and simulation studies that can predict the impact of changes in system-level variables (e.g., current ripple and load-transients) on the local current densities, voltages, and temperature (these parameters are very difficult or cumbersome, if not impossible to obtain) within a SOFC cell. Towards that end, this paper presents a design methodology (with illustrations) for a simulation tool that will enable comprehensive analyses of above (critical) issues.

Research on Influence Factors of Cooling Tower Performance

2011 ◽  
Vol 280 ◽  
pp. 119-123 ◽  
Author(s):  
Meng Lei Wang ◽  
Zhe Tian ◽  
Kui Xing Liu
Keyword(s):  
Flow Rate ◽  
Air Conditioning ◽  
Heat Dissipation ◽  
Cooling Tower ◽  
Influence Factors ◽  
Cooling Water ◽  
Cooling Capacity ◽  
Air Conditioning System ◽  
Energy Efficiency Improvement ◽  
Water Ratio

The cooling tower is often overlooked in the air conditioning system, but it impacts on the heat dissipation of system. This paper tests and researches the influence factors of cooling tower performance. First, we analyzed the cooling tower efficiency, cooling capacity and others of an actual air conditioning system. Then we studied the relationship between air/water ratio, inlet air quality and flow rate and the cooling tower performance. The results show that the air/water ratio have a linear relationship with the cooling tower efficiency, and the quality and the flow rate of inlet air have a greater impact on the cooling capacity and cooling water contrast method. This paper has an certain significance on the diagnosis and energy efficiency improvement of cooling towers.

scholarly journals THE IMPACT ANALYSIS OF MOTIVATION, TRAINING, AND WORK ENVIRONMENT TO NURSES PERFORMANCE IN PATIENT SAFETY

2019 ◽  
Vol 2 (1) ◽  
pp. 54
Author(s):  
Fushen Fushen ◽  
Meylona Verawaty Zendrato
Keyword(s):  
Patient Safety ◽  
Work Environment ◽  
Public Hospital ◽  
Impact Analysis ◽  
Working Environment ◽  
Cross Sectional ◽  
The Public ◽  
Increasing Demand ◽  
And Performance ◽  
The Impact

The development of hospitals in health industry as economic institutions and the establishment of many new hospitals increase the number of nurses needed while the number of nurses produced cannot keep pace with the increasing demand. In hospital services, nurse is the most frequently interacted person with patients and are fully responsible for patient care, including in terms of patient safety. This study aims to obtain empirical evidence about the effect of motivation, training and work environment on the performance of nurses in patient safety in the Public Hospital. Expected output from this study can be used as a reference to determine the policy for nurse management at the hospital. This is a correlational analytic study with a cross-sectional approach and descriptive method of verification. The research was conducted in a Public Hospital in Jakarta. The research sample are 90 nurses working in inpatient wards. The hypothesis of this study were analyzed with path analysis methods. The results of this study showed a significant positive effect between motivation and performance (20.7%), training and performance (21.8%), working environment and performance (20.7%), and the simultaneous influence from motivation, training, and working environment on the performance (63.2% ).

Avoiding Common Pitfalls in Cooling Tower Pump Intake Design Related to Hydraulic Performance

2009 ◽  
Author(s):  
Timothy C. Sassaman ◽  
Andrew E. Johansson ◽  
Mahadevan Padmanabhan
Keyword(s):  
Power Plants ◽  
Cooling Tower ◽  
Cooling Water ◽  
Design Guidelines ◽  
Cooling Towers ◽  
Water Pump ◽  
Model Studies ◽  
Cooling Flow ◽  
And Performance ◽  
Plant Capacity

Cooling towers are an attractive method to provide cooling water to power plants and other process cooling applications. The use of cooling towers versus once-through cooling significantly reduces the amount of water drawn from rivers and lakes, which is particularly important in many regions in the Western United States where water availability is a problem. Cooling towers also eliminate thermal pollution due to cooling water discharges into and greatly reduce the amount of water withdrawn from natural bodies of water. Despite these advantages, cooling towers provide special challenges with regard to the design of cooling water pump intake structures. These challenges must be addressed to ensure a reliable flow of cooling water with a minimum expenditure of power in order to maximize the plant capacity and efficiency. Design factors such as footprint, civil constraints, increases in plant capacity requiring increased cooling flow, and off-design operation can all affect the flow hydraulics and therefore negatively affect the performance of the pumps. In this paper, general hydraulic design guidelines and performance acceptance criteria for pump intakes based on Hydraulic Institute Standards are outlined. Case studies from physical model studies of cooling water pump intakes are presented which may provide insight into likely problems and design flaws that engineers should be aware of while designing cooling tower pump intake structures. Examples of measures to avoid or remedy the commonly-encountered hydraulic problems derived from hydraulic model studies are discussed.

The Impact of Property Characteristics on Economic Performance of Russian Industrial Enterprises

2005 ◽  
pp. 53-68 ◽  
Author(s):  
R. Kapeliushnikov ◽  
N. Demina
Keyword(s):  
Detailed Analysis ◽  
Economic Performance ◽  
Ownership Concentration ◽  
Corporate Sector ◽  
Concentrated Ownership ◽  
Industrial Enterprises ◽  
Russian Industry ◽  
Control Premium ◽  
And Performance ◽  
The Impact

The paper provides new survey evidence on effects of concentrated ownership upon investment and performance in Russian industrial enterprises. Authors trace major changes in their ownership profile, assess pace of post-privatization redistribution of shareholdings and provide evidence on ownership concentration in the Russian industry. The major econometric findings are that the first largest shareholding is negatively associated with the firm’s investment and performance but surprisingly the second largest shareholding is positively associated with them. Moreover, these relationships do not depend on identity of majority shareholders. These results are consistent with the assumption that the entrenched controlling owners are engaged in extracting "control premium" but sizable shareholdings accumulated by other blockholders may put brakes on their expropriating behavior and thus be conductive for efficiency enhancing. The most interesting topic for further more detailed analysis is formation, stability and roles of coalitions of large blockholders in the corporate sector of post-socialist countries.

The Impact of Women’s Employment on Marital Stability in Qatar Society

2019 ◽  
Vol 10 (2) ◽  
pp. 144-151
Author(s):  
Noora Ahmed Lari ◽  
Keyword(s):  
Work Motivation ◽  
Marital Stability ◽  
Female Employment ◽  
Social Constraints ◽  
Primary Data ◽  
Family Policies ◽  
Insufficient Time ◽  
And Performance ◽  
The Impact ◽  
The Relationship

The State of Qatar has implemented several family policies in order to improve the wellbeing of Qatari families and ensure fair distribution of development benefits for both men and women. However, there is a linkage between female employment outside the home and instability in the marriages of Qatari families. This paper investigates the impact of female employment on marital stability, based on the results of primary data collected in Qatar, a questionnaire that consisted of several sections such as challenges in the workplace, supervisor, family and spouse relations, work motivation and performance. Of the 824 questionnaires that were returned, 807 were completed and valid for analysis. Regression analysis and an ANOVA test have been used to test the relationship between the variables. The results of the research have produced mixed findings about how wives’ employment increases marital instability and have yielded few significant differences on mean scores of discuss on work demands, insufficient time together, housework, financial matters, communication, relatives and rearing children. The results indicates that in general Qatar working women face several challenges in relation to their marital life as part of cultural and social constraints.

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