AERODYNAMICS OF CERAMIC REGULAR SEDIMENTATION FOR HEAT AND MASS TRANSFER APPARATUSES OF ENVIRONMENTAL PROTECTION/KERAMINIŲ REGULIARIŲ ANTGALIŲ AERODINAMIKA ŠILUMOS IR MASĖS PERNAŠOS PROCESAMS APLINKOS APSAUGOS ĮRENGINIUOSE VYKDYTI/ АЭРОДИНАМИКА КЕРАМИЧЕСКИХ РЕГУЛЯРНЫХ НАСАДОК ДЛЯ ТЕПЛОМАССООБМЕННЫХ ПРОЦЕССОВ В АППАРАТАХ ЗАЩИТЫ ОКРУЖАЮЩЕЙ СРЕДЫ

2008 ◽  
Vol 16 (1) ◽  
pp. 30-37 ◽  
Author(s):  
Aleksandr Pushnov ◽  
Algirdas Sakalauskas
Keyword(s):  
Mass Transfer ◽  
Environmental Protection ◽  
Heat And Mass Transfer ◽  
Cooling Tower ◽  
Ceramic Foam ◽  
Test Facility ◽  
Test Results ◽  
Aerodynamic Test ◽  
Processing Techniques ◽  
Aerodynamic Investigation

A new efficient ceramic regular sedimentation for heat and mass transfer in apparatuses of environmental protection is proposed. A new sedimentation realization with isotropic properties of a structure is offered. The aerodynamic test results of the new sedimentation are shown. The paper describes a laboratory test facility designed for conducting aerodynamic investigation of cooling tower sedimentation. Measured parameters, data processing techniques and examples of the results obtained are discussed. The tested sedimentation is a porous layer of ceramic foam manufactured by special technology. Santrauka Siūloma nauja keraminių reguliarių antgalių dinamika šilumos ir masės pernašos procesams aplinkos apsaugos įrenginiuose vykdyti. Siūlomas antgalis leis realizuoti poringojo sluoksnio izotopinę struktūrą. Pateikti naujo antgalio aerodinaminių bandymų rezultatai. Резюме Предложена новая эффективная керамическая регулярная насадка для осуществления процессов тепло- и массообмена в аппаратах газоочистки. Предлагаемая насадка позволяет реализовать изотропную структуру зернистого слоя. Приведены результаты аэродинамических испытаний новой насадки.

scholarly journals ANALYSIS OF HEAT AND MASS TRANSFER ON COOLING TOWER FILL

2020 ◽  
Vol 14 (1) ◽  
pp. 25
Author(s):  
Abdul Aziz Rohman Hakim ◽  
Engkos Achmad Kosasih
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Relative Humidity ◽  
Heat And Mass Transfer ◽  
Cooling Tower ◽  
Stream Velocity ◽  
Design Data ◽  
Analogy Method ◽  
Ambient Relative Humidity ◽  
Air Stream

This paper discusses heat and mass transfer in cooling tower fill. In this research, dry bulb temperature at the bottom fill, ambient relative humidity, air stream velocity entering fill, dry bulb temperature leaving the fill, relative humidity of air leaving the fill, inlet and outlet water temperature of cooling tower were measured. Those data used in heat and mass transfer calculation in cooling tower fill. Then, do the heat and mass transfer calculation based on proposed approch. The results are compared with design data. The design and analogy method showed different  result. The parameter which influence the heat transfer at cooling tower are represented by coefficient of heat transfer hl and coefficient of mass transfer k­l. The differencies result between design and analogy method shows that there is important parameter which different. Deeply study needed for it.

Steady-State Performance of a Small-Scale Liquid-to-Air Membrane Energy Exchanger for Different Heat and Mass Transfer Directions, and Liquid Desiccant Types and Concentrations: Experimental and Numerical Data

2013 ◽  
Vol 135 (12) ◽  
Author(s):  
Davood Ghadiri Moghaddam ◽  
Philip LePoudre ◽  
Robert W. Besant ◽  
Carey J. Simonson
Keyword(s):  
Experimental Data ◽  
Mass Transfer ◽  
Steady State ◽  
Heat And Mass Transfer ◽  
Salt Solution ◽  
Test Facility ◽  
Small Scale ◽  
Air Cooling ◽  
Test Cases ◽  
Membrane Energy

A liquid-to-air membrane energy exchanger (LAMEE) is an energy exchanger that allows heat and moisture transfer between air and salt solution flows through a semipermeable membrane. For the first time, a novel small-scale single-panel LAMEE test facility is used to experimentally investigate the effect of the direction of heat and mass transfers for the air and salt solution flows, and the effect of different salt solution types and concentrations on the LAMEE effectiveness. The data for steady-state effectiveness of the LAMEE are compared to the simulation results of a numerical model. Two studies are conducted; first a study based on different heat and mass transfer directions (four test cases), and second a study focused on the influence of solution types and concentration on LAMEE performance. For the first study, NTU = 3 and four different heat capacity ratios (i.e., Cr* = 1, 3, 5, 7) are used, with a LiCl salt solution in the exchanger. Mass and energy balances for all the test cases and the repeatability of the experimental data for the air cooling and dehumidifying test case show that the experimental data are repeatable and within an acceptable uncertainty range. The results show increasing effectiveness with increasing Cr*, and good agreement between the numerical and experimental results for both air cooling and dehumidifying and air heating and humidifying test cases. In the second study, two different salt solutions (i.e., LiCl and MgCl2), and three different concentrations for the LiCl solution (i.e., 25%, 30%, and 35%) are selected to investigate the effect of different salt solution types and concentrations on the performance of the LAMEE. A maximum difference of 10% is obtained for the LAMEE total effectiveness data with the different salt solution types and concentrations. The results show that both the salt solution type and concentration affect the LAMEE effectiveness, and changing the concentration is one way to control the supply air outlet humidity ratio.

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