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Optimization of IAQ characteristics of an air-conditioned car using GRA and RSM
P. Thirumal,K. S. Amirthagadeswaran,S. Jayabal 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.5
Considering that air conditioning is widely applied for improving human standard of living, this present investigation is focused on theoptimization of indoor air quality characteristics of air-conditioned cars using the Gray relational analysis (GRA) and the response surfacemethodology (RSM). The air-conditioned space is selected and the experiments are planned as per experimental design to study theeffects of human load, fresh air supply, and air velocity on human comfort conditions. Mathematical models are developed to predict thecomfort conditions, namely temperature, CO2 level, and relative humidity over a specified range of input conditions. The optimum valuesof comfort conditions for varying input conditions are found by assigning weightages to individual responses using GRA and RSM.
R. Barathiraja,P. Thirumal,G. Saraswathy,I. Rahamathullah 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.6
The drying behavior of turkey berries was investigated in a fluidized bed dryer with mild steel, copper, and aluminum as an inert medium with varying mass ratio of 0.5, 1, and 2 at a constant temperature 70 °C and velocity 4 m/s. The effect of surface roughness of the inert materials on the drying of samples was studied. It was found that the roughened surface and the presence of inert materials enhanced the drying rate. Aluminum inert materials with mass ratio of 1:1, surface roughness of 1mm and larger surface area resulted in a minimum drying time of 465 min, the maximum effective moisture diffusivity of 4.078x10 −10 m 2 /s, the highest vitamin C content of 1.38 g per 100 g, lowest shrinkage percentage of 40.3 %, and minimum change in color (∆E = 7.11) were obtained.
Chemical Investigations and Anti-inflammatory Activity of Fixed Oil of Butea monosperma Seeds
A. Gunakunru,K. Padmanaban,P. Thirumal,N. Vengatesan,N. Gnanasekar,S. Raja,A.T. Rajarajan,S.G. Vijaya Kumar,J. Britto Perianayagam 한국생약학회 2004 Natural Product Sciences Vol.10 No.2
The fruit and seeds of Butea monosperma (Lam) Kuntze (Fabaceae) are useful in piles, anthelmintic, eye diseases, and inflammation in the Indian system of medicine. Hence, we have evaluated the anti-inflammatory activity of the fixed oil, mixed fatty acids, and unsaponifiable matter of B. monosperma against carrageenan-induced paw oedema and cotton pellet-induced granuloma in rats. The fixed oil, mixed fatty acids, and unsaponifiable matter of the oil exhibited significant anti-inflammatory activity on the tested experimental animal models. The unsaponifiable matter of the oil produced higher protection compared to fixed oil and mixed fatty acids. Phytochemical analysis of the fixed oil revealed the presence of steroids and terpenoids while unsaponifiable matter of the oil showed the presence of β-sitosterol. Also, four fatty acids were identified in the fixed oil by gas liquid chromatography. The anti-inflammatory activity of the fixed oil may be due to unsaponifiable matter or combination of unsaponifiable matter and mixed fatty acids.