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8. Performance analysis of a modular adsorption cooling system with sonic vibration at the evaporator

Author

Wongsuwan, Wipawadee, Ritthong, Wirote, Kiatsiriroat, Tanongkiat, and Nuntaphan, Atipoang

Subjects
Vibration -- Research, Evaporating appliances -- Mechanical properties, Evaporating appliances -- Acoustic properties
Abstract

The experimental study of a single-effect modular adsorption cooling system with an activated carbon-methanol working pair is presented in this paper. The test unit is comprised of an adsorber, a condenser, and an evaporator in vertical alignment. Heating and cooling at the adsorber is by hot water at 70-90[degrees]C, whereas heating at the evaporator is performed by water at the ambient temperature. At the evaporator, a sonic wave generator enhances heat transfer for the boiling of methanol during the adsorption process. The system performance by considering the coefficient of performance (COP), specific cooling power (SCP), and volumetric cold production (VCP) is evaluated, and the sonic wave is demonstrated to reduce the evaporation time of methanol, which results in better system performances compared with the results in literature. The highest COP and SCP obtained from this system are 0.718 and 248.90 W/kg, respectively. DOI: 10.1061/(ASCE)EY.1943-7897.0000039. [c] 2011 American Society of Civil Engineers. CE Database subject headings: Performance characteristics; Adsorption; Cooling; Vibration; Evaporation. Author keywords: Performance analysis; Adsorption cooling; Sonic wave.

Published
2011

9. Characterization of Antiferromagnetism in Double Perovskites Ba2FeMoO6 Prepared by Solid State Method

Author

Albutt, Naphat, Aitviriyaphan, Vanussanun, Sareein, Thanapong, Suntaropas, Sudarath, Thonglor, Panakamon, Pechprasarn, Suejit, Sawekwiharee, Sangwoei, Ritthong, Wirote, and Pinitsoontorn, Supree

Abstract

The magnetic properties of Ba2FeMoO6 (BFMO) double perovskite are investigated. BFMO samples were prepared by solid state reaction method through compression. Magnetic properties are influenced by electron environments of the Fe3+ and Mo5+ ions within the perovskite structure. BFMO sintered at 800 oC exhibited the largest hysteresis loop at 50 K. In addition, the values of Ms and Mr indicate ferromagnetic behaviour in BFMO ceramics sintered at 800 oC for different times up to 10 hours. Using the Curie-Weiss law fitting to investigate μeff~30μB high spin of Fe and Mo, and negative θ present the antiferromagnetic characteristics of the BFMO sample.

Published
2019
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10. Study, Magnetic Properties of BaTiFeO3 Perovskite Prepared by Solid State Method

Author

Aitviriyaphan, Vanussanun, Sareein, Thanapong, Suntaropas, Sudarath, Thonglor, Panakamon, Sawekwiharee, Sangwoei, Pechprasarn, Suejit, Ritthong, Wirote, Pinitsoontorn, Supree, and Albutt, Naphat

Abstract

The magnetic properties of BaFeTiO3 (BTFO) perovskite are investigated. BTFO samples were prepared by solid state reaction method through compression. Magnetic properties are influenced by electron environments of the Fe3+ ions within the perovskite structure. Furthermore, the values of Ms and Mr indicate ferromagnetic behaviour in BFMO ceramics sintered at 800 oC for sintering as 800 oC for 6 hours at 1.898 emu/g, which is magnetization strength material more than sintering at 4 hours, 8 hours, 10 hours as 1.794 emu/g, 1.333 emu/g and 1.192 emu/g at measured of low temperature. Using the Curie-Weiss law fitting for investigate μeff~38μB high spin of Fe, negative of θ present to antiferromagnetic characteristics of BTFO sample. Finally, BTFO sintering at the high temperature of 800 oC for 6 hours exhibited the high Ms~1.898 emu/g at 50 K and ~1.216emu/g at room temperature.

Published
2019
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