15 humidification fundamentals
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The document discusses the fundamentals of cooling tower design and operation. Cooling towers work by evaporating a portion of hot water into unsaturated air, which cools the water. Differential balances are used in the tower, including enthalpy and mass balances. Design equations require integrating these differential equations. The results are used to determine the height of transfer units (HTUs) and number of transfer units (NTUs) needed. NTUs are evaluated using equilibrium data from psychrometric charts, while HTUs are evaluated using operating line and driving force line data and slopes. A minimum air flow is also determined based on an infinite packing height.
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HME
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The document outlines a 14-step process for manually designing a shell and tube heat exchanger using the Kern method. Key steps include: 1) obtaining thermo-physical properties of fluids, 2) performing an energy balance to determine heat duty, 3) assuming an overall heat transfer coefficient, 4) deciding tube passes and calculating the log mean temperature difference, 5) calculating required heat transfer area, 6) selecting tube materials and dimensions, 7) deciding exchanger type and tube pitch, 8) assigning fluids and selecting baffles, 9) calculating heat transfer coefficients, 10) checking the calculated overall heat transfer coefficient, 11) recalculating as needed, 12) calculating overdesign, 13) calculating pressure drops, and 14)
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Fq2410291035
This document summarizes a study on using computational fluid dynamics (CFD) to simulate flow in reaction turbines. The study used CFD to model flow in an axial flow turbine and a mixed flow turbine. Simulation results for efficiency and discharge at varying operating conditions were found to compare well with experimental data. CFD allows detailed analysis of flow patterns and performance under off-design conditions in a more cost-effective manner than physical testing. The study analyzed pressure and velocity distributions within the turbines and how they vary with operating parameters like guide vane opening and rotational speed.
HMT Week 13.pdf in hmt hmt hmt hmt heat nd mass transfer
This document discusses heat exchangers and classifies their types. It describes that heat exchangers transfer heat between two flowing fluids and are commonly used in applications like space heating, cooling, and power production. The key types discussed are parallel flow, counterflow, crossflow, shell-and-tube, and compact heat exchangers. It also covers the overall heat transfer coefficient and log mean temperature difference, which are important parameters for analyzing heat exchanger performance.
types of heat exchangers.pdf
This document discusses heat exchangers, including their types, performance parameters, and design methodologies. It introduces the log mean temperature difference method for relating heat transfer rate to inlet/outlet temperatures. It also describes the effectiveness-NTU method, where effectiveness is defined as the ratio of actual to maximum possible heat transfer, and NTU is the number of transfer units. Sample problems demonstrate the use of these methods to determine required surface areas, heat transfer rates, and outlet temperatures for given heat exchanger configurations and operating conditions.
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The document reviews the effect of chevron angle and numerical investigation of dimensionless numbers in plate heat exchangers. It discusses previous research that has examined heat transfer coefficients and pressure drops at different chevron angles. The paper aims to design a plate heat exchanger using different chevron angles and evaluate heat transfer performance through simulation analysis of numbers like Nusselt, Reynolds, and Prandtl.
MERKELS METHOD FOR DESIGNING INDUCED DRAFT COOLING TOWER
In general, cooling towers are used to dissipate process waste heat into the atmosphere. In this paper, induced draft cooling tower has been designed by simplified merkel’s method. The design of cooling tower is based on Merkel’s method. The t ower characteristic is determined by the ratio of range and log-mean-enthalpy difference. Optimization of the operating conditions for cooling tower applications in cooling water is extremely significant in order to get the most energy efficient operating point for these systems. A simple algebraic formula is used to calculate the optimum water-to-air flow rate. Merkel’s method is the most widely accepted theory for cooling tower calculations. It combines equations for heat and water vapor transfer. The objective of this paper is to present the design procedure of counter – flow cooling towers in a simplified manner
C341518
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
An experimental study of heat transfer in a corrugated plate heat exchanger
1. The document discusses an experimental study of heat transfer in a corrugated plate heat exchanger. Experiments were conducted to analyze heat transfer characteristics for different flow arrangements of hot and cold fluids through the heat exchanger.
2. The effectiveness and exergy loss of the heat exchanger were calculated for parallel and counter flow arrangements. The average effectiveness was found to be 48% higher and exergy loss 33% lower in the counter flow arrangement compared to the parallel flow arrangement.
3. Maximum heat transfer was observed at the highest hot fluid inlet temperature of 70°C, being 5% greater in the parallel flow arrangement. However, the non-dimensional exergy loss and log mean temperature difference were both lower in the
Presentation 3 ce801 by Rabindra Ranjan Saha, PEng, Assoc. Prof. WUB
The document discusses flow properties in open channels including:
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- Examples are provided to demonstrate calculating hydraulic properties for given channel cross sections.
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15 humidification fundamentals
- 1. HUMIDIFICATION FUNDAMENTALS COOLING TOWER DESIGNS http://www.picture-newsletter.com/nuclear/cooling-tower-ub4.jpg