Showing papers by "Rosenberg J. Romero published in 2014"

Performance of Different Experimental Absorber Designs in Absorption Heat Pump Cycle Technologies: A Review

Abstract: The absorber is a major component of absorption cycle systems, and its performance directly impacts the overall size and energy supplies of these devices. Absorption cooling and heating cycles have different absorber design requirements: in absorption cooling systems, the absorber works close to ambient temperature, therefore, the mass transfer is the most important phenomenon in order to reduce the generator size; on the other hand, in heat transformer absorption systems, is important to recover the heat delivered by exothermic reactions produced in the absorber. In this paper a review of the main experimental results of different absorber designs reported in absorption heat pump cycles is presented.

Waste Heat Revalorization with Electric Generation Based on Fuel Cell

Abstract: In the following article the joining of a system of electric generation is described with a thermal transformer by absorption (AHT). The electric system is formed by to cell of combustible type PEM in which is entered hydrogen and oxygen to pressures of the same order of magnitude. The heat that is necessary to release of the cell of fuel is given an AHT using the mixture aqueous lithium bromide. The mixture H2O/ LiBr has been selected by its smaller operation generation temperatures to 373 K. The results show the operation coefficient and the cogeneration coefficient in function of the temperature of operation of the cell of fuel (TFC) and the temperature of the surroundings (Tamb). The results show the obtaining of revalorized useful heat and electric power.

Temperature and concentration fields in a generator integrated to single stage heat transformer using Water/Carrol mixture

Abstract: The generator is the starter device of single stage heat transformer (SSHT) and its characteristics have main effects on the overall efficiency of this kind of absorption machines. This article reports a study of the generation of steam and changes in the concentration of the working solution (Water/Carrol mixture) into a plate heat exchanger as a function of its horizontal and vertical position by gravity effect. It is considered the analysis of six experimental tests; two were evaluated in a plate heat exchanger in a horizontal position and four in a vertical position (90 degree inclination). The generation of steam and increased concentration of the working solution are more sensitive to the vertical position of exchanger than in horizontal position. The results of numerical-experimental analysis indicates that a heat exchanger in horizontal position, the steam generation and the change in the concentration of the working solution occurring in the middle of the plate (or at greater distance depending to the thermodynamic conditions) and instantly in vertical position (at the input of the plate).

Optimum Water Storage in Al-Baha, Kingdom of Saudi Arabia

Abstract: This paper shows a dimensionless comparison for two thermodynamic cycles. For power lower than 2 kW into each component for advanced inverse heat pumps the calculation were made. Comparison for double absorption (DAHT) and double stage (DSHT) are shown. Modelling based for a single stage absorption heat transformer (SSHT) and advanced heat transformer is detailed. Coefficient of performances are plotted as function of useful temperatures above 120 oC. DSHT and DAHT are alternative devices for operating conditions from 120 to 140 °C using waste heat at 60 °C. The results show the COP for DSHT and DAHT as function of waste heat temperature, ambient temperature and revalorized temperature.