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Your search keyword '"Tyagi, A. K."' showing total 2,741 results
Start Over Author "Tyagi, A. K." Publication Type Academic Journals
2,741 results on '"Tyagi, A. K."'

45. Relative versions of star-Menger property.

Author

Mittal, Sumit, Kumar, Gaurav, and Tyagi, Brij K.

Abstract

Motivated by Bonanzinga and Maesano (2022), we introduce and study the new relative versions of star-Menger property related to some properties studied lately by Kočinac et al. (2022) and Bonanzinga et al. (2023). In this paper, we provide some examples to understand their relationships with other relativizations of star selection principles. Further, we investigate the behaviour of these spaces under various mappings. [ABSTRACT FROM AUTHOR]

Published
2024
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46. Potential assessment of biomass-based single-stage adsorption systems for refrigeration, cooling, and heat-pumping applications.

Author

Chauhan, P. R., Yagnamurthy, S., and Tyagi, S. K.

Subjects
ACTIVATED carbon, HEAT exchangers, BIOMASS burning, HEAT pumps, REFRIGERATION & refrigerating machinery, EVAPORATIVE cooling, SORBENTS
Abstract

This article presents the performance estimation of a single-stage vapor adsorption system employing various carbon-based adsorbents with ethanol refrigerant, coupled with a small-scale biomass-based heating unit for space cooling, refrigeration, and heat-pumping applications. A detailed parametric investigation highlights the effects of operating temperatures, and heat exchanger to adsorbent mass ratio on specific cooling energy (SCE), coefficient of performance (COP), uptake efficiency (ηu), and mass of adsorbent to combustion fuel (mad/mcf) to identify the suitable adsorbent and sorption bed designs for each application. The numerical findings reveal that the flat-finned tube (FFT) adsorber outperforms traditional-finned tube (TFT) and tube & shell-type (T&S) adsorbers, achieving 19% and 30% higher COP, respectively, with biomass carbon-ethanol pair. The H2-treated Maxsorb-III shows the greatest optimal cooling COP (0.73), followed by the biomass-carbon (0.72) for refrigeration and space cooling. For heat pumping applications, biomass carbon-ethanol achieves the highest heat pumping COP (1.84) at a desorption temperature of 90°C, surpassing H2-treated Maxsorb-III. Further, the biomass-derived activated carbon requires the lowest amount of adsorbent per unit mass of combustion fuel in the biomass heating unit. The present thermodynamic analysis is a precursor for optimization of the potential heat-exchanger geometries and operating parameters, with the high-performance carbon adsorbents. [ABSTRACT FROM AUTHOR]

Published
2024
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47. Advances in solar absorption cooling systems: An overview.

Author

KAUSHIK, S. C., VERMA, Abhishek, and TYAGI, S. K.

Abstract

The need for refrigeration and air conditioning plays a crucial role in energy consumption. It is one of the important aspects which plays a crucial role in the food, human comfort, and energy problems of any country. Rapid consumption of energy and fossil fuels depletion results in the onset of energy crises thus, the research on absorption refrigeration systems has been widely promoted because the input energy supply for the systems can be a low-grade heat available from solar, geothermal, and/or waste heat from Industries. Solar refrigeration and air conditioning is an attractive and promising applications of solar energy because the cooling demand and the availability of solar energy are in phase and solar cooling can be made cost-effective. The present work includes the solar energy option and the potential for cooling with various range of parameters such as availability of solar radiation, environmental effects, types of collectors, types of solar cooling systems in general, and closed/open/continuous/multistage/hybrid and advanced absorption refrigeration cycles in particular. A literature survey has been carried out for possible improvements in the performance of solar absorption cooling systems and different solar collection and storage options. The most suitable solar cooling option viz. absorption refrigeration with the solar operation, historical developments, and commercial products. Advanced absorption cycles and novel cooling systems have also been presented and discussed. [ABSTRACT FROM AUTHOR]

Published
2024
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