Corrosion Analysis of Copper Tubes in the Exchangers with the Assistance of Atom Absorption Spectroscopy

2013 ◽  
Vol 378 ◽  
pp. 275-279
Author(s):  
Hao Zhang ◽  
Yuan Sheng Lin ◽  
Ke Long Zhang ◽  
Zhi Guo Wei ◽  
Wei Wei Wang
Keyword(s):  
Carbon Dioxide ◽  
Dissolve Oxygen ◽  
Absorption Spectroscopy ◽  
Thermal Performance ◽  
Heat Exchangers ◽  
Working Condition ◽  
Corrosion Process ◽  
Advantages And Disadvantages ◽  
Working Media ◽  
Atom Absorption

Copper was always used as the tube materials of heat exchangers because of its superior thermal performance. The working condition of the pipes played an important role in the corrosion process. Copper would be eroded by the dissolve oxygen and carbon dioxide in water. In this manuscript, the corrosion factors inside the heat exchangers were analyzed. Besides, atom absorption spectroscopy (AAS) was introduced and used to detect copper in the working media of two exchangers. Advantages and disadvantages of AAS were discussed.

scholarly journals Experimental Investigation and Comparison of the Thermal Performance of Additively and Conventionally Manufactured Heat Exchangers

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 574
Author(s):  
Ana Vafadar ◽  
Ferdinando Guzzomi ◽  
Kevin Hayward
Keyword(s):  
Surface Roughness ◽  
Thermal Performance ◽  
Heat Exchangers ◽  
High Efficiency ◽  
Cooling System ◽  
Fluid Dynamic ◽  
Dynamic Performance ◽  
Experimental Studies ◽  
Manufacturing Method ◽  
Industrial Sectors

Air heat exchangers (HXs) are applicable in many industrial sectors because they offer a simple, reliable, and cost-effective cooling system. Additive manufacturing (AM) systems have significant potential in the construction of high-efficiency, lightweight HXs; however, HXs still mainly rely on conventional manufacturing (CM) systems such as milling, and brazing. This is due to the fact that little is known regarding the effects of AM on the performance of AM fabricated HXs. In this research, three air HXs comprising of a single fin fabricated from stainless steel 316 L using AM and CM methods—i.e., the HXs were fabricated by both direct metal printing and milling. To evaluate the fabricated HXs, microstructure images of the HXs were investigated, and the surface roughness of the samples was measured. Furthermore, an experimental test rig was designed and manufactured to conduct the experimental studies, and the thermal performance was investigated using four characteristics: heat transfer coefficient, Nusselt number, thermal fluid dynamic performance, and friction factor. The results showed that the manufacturing method has a considerable effect on the HX thermal performance. Furthermore, the surface roughness and distribution, and quantity of internal voids, which might be created during and after the printing process, affect the performance of HXs.

Measuring complex for monitoring carbon dioxide in air

2021 ◽  
pp. 68-71
Author(s):  
Igor M. Ageev ◽  
Yuri M. Rybin
Keyword(s):  
Carbon Dioxide ◽  
High Selectivity ◽  
Distilled Water ◽  
Measuring Systems ◽  
Advantages And Disadvantages ◽  
Measuring Complex ◽  
Co2 Level ◽  
Carbon Dioxide Co2 ◽  
Term Monitoring

The advantages and disadvantages of infrared and electrochemical gas analyzers for carbon dioxide CO2 are described. The possibility of using conductometric sensors with distilled water for monitoring the CO2 content in the air has been investigated. Two identical measuring systems were manufactured, each containing two open-type conductometric cells, a matching device and a personal computer. With the help of these complexes, experiments were carried out on the simultaneous measurement of the CO2 content in the air in two places (a laboratory room and a building in a forest, located at a distance of 15 km from each other) with deliberately different daily dynamics of the CO2 level change. A special experiment was carried out, which made it possible to obtain an estimate of the inertia of conductometric cells and a conversion factor for the values of CO2 content into standard units of measurement. It is shown that the daily dynamics of changes in the electrical conductivity of distilled water in open cells corresponds to the expected dynamics of changes in the CO2 content in the rooms where the measurements were carried out. The operability of the measuring complex and the possibility of creating on its basis a device for long-term monitoring of the CO2 content in the air mixture of gases has been confirmed. The principal high selectivity of the measuring complex to CO2 in relation to other gases of the atmosphere has been established.

Comparison of thermal performance between tube and plate ground-air heat exchangers

2018 ◽  
Vol 115 ◽  
pp. 697-710 ◽  
Author(s):  
Mroslaw Zukowski ◽  
Justyna Topolanska
Keyword(s):  
Thermal Performance ◽  
Heat Exchangers
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