Showing papers by "D. Yogi Goswami published in 2004"
TL;DR: Theoretical analysis of a solar desalination system utilizing an innovative new concept, which uses low-grade solar heat, is presented in this article, where natural forces are used to create vacuum conditions and its incorporation in a single system design where evaporation and condensation take place at appropriate locations without any energy input other than low grade heat.
Abstract: Theoretical analysis of a solar desalination system utilizing an innovative new concept, which uses low-grade solar heat, is presented. The system utilizes natural means of gravity and atmospheric pressure to create a vacuum, under which liquid can be evaporated at much lower temperatures and with less energy than conventional techniques. The uniqueness of the system is in the way natural forces are used to create vacuum conditions and its incorporation in a single system design where evaporation and condensation take place at appropriate locations without any energy input other than low grade heat. The system consists of solar heating system, an evaporator, a condenser, and injection, withdrawal, and discharge pipes. The effect of various operating conditions, namely, withdrawal rate, depth of water body, temperature of the heat source, and condenser temperature were studied. Numerical simulations show that the proposed system may have distillation efficiencies as high as 90% or more. Vacuum equivalent to 3.7 kPa (abs) or less can be created depending on the ambient temperature at which condensation will take place. @DOI: 10.1115/1.1669450#
64 citations
Patent•
25 Oct 2004TL;DR: In this article, an aperture rectenna is provided where the substrate is transparent and of sufficient mechanical strength to support the fabricated structure above it, and an aperture antenna is deposited on the transparent substrate and a metal-insulator-metal (MIM) diode is constructed on top of the aperture antenna.
Abstract: In accordance with the present invention, an aperture rectenna is provided where the substrate is transparent and of sufficient mechanical strength to support the fabricated structure above it. An aperture antenna is deposited on the transparent substrate and a metal-insulator-metal (MIM) diode is constructed on top of the aperture antenna. There is an insulating layer between the aperture antenna metal and the metal ground plane optimized to maximize the collection of incident radiation. The top of the structure is capped with a metal ground plane layer, which also serves as the DC connection points for each rectenna element.
12 citations
01 Jan 2004
TL;DR: In this paper, a new design of a falling film absorber was presented, which could considerably reduce the absorber size without penalizing on the vapor and coolant side pressure drops.
Abstract: The paper presents a new design of a falling film absorber that could considerably reduce the absorber size without penalizing on the vapor and coolant side pressure drops. The proposed design is based on the fundamental characteristics of an efficient absorber design: large liquid-vapor interfacial area and good wetting characteristics. A finite difference scheme is developed to numerically investigate the performance of the design. The results indicate that the proposed design is more compact and efficient than the conventional falling film absorber.Copyright © 2004 by ASME
2 citations
TL;DR: In this article, a combined power-cooling thermodynamic cycle is proposed for low-temperature, sensible heat sources. But, the work is limited to the case where the expander exhaust temperature is controlled by the cycle parameters of expander exit pressure (absorption pressure), expander isentropic efficiency, and the vapor properties at expander inlet.
2 citations