Thermodynamic optimization of an absorption heat transformer

Exergy Analysis of a Vapor Absorption Heat Transformer Using Modified Guoy–stodala Equation

“…The thermodynamic properties at various state points as shown in Table 3 are computed numerically and then the heat transfer rate, entropy generation rate and exergy destruction is calculated. Table 4 shows that the proposed model simulates the system very close to the work of Zebbar et al 6 and the slight variation may be attributed to the di®erence in the properties of the working°uid pair evaluated by the software and that taken in the reference work.…”

“…The model of the present study is validated from the results obtained by Zebbar et al 6 Both the works provide matching results. Table 4 depicts the di®erence in the heat rate, entropy generation rate and exergy destruction rate at various components of the system obtained in the present study and that illustrated by Zebbar et al 6 The outlet temperature of external°uid at different components of the AHT does not remain constant during its operation. There is a slight change in this temperature due to the continuous heat exchange between the surroundings and individual components.…”

“…while keeping the working°uid pair and system components to be the same. Under this category the work of Zebbar et al 6 is worth mentioning, their analysis on the AHT through the concept of irreversibility and optimization of the vapor AHT thermodynamically using a mathematical model upon variations introduced to the pressure ratios and concentrations was appreciable. Another way of optimizing the performance of the system is to observe the changes introduced in the irreversibility of the system owing to variations in the temperature of the components.…”

Recycling waste heat energy using vapour absorption heat transformers: A review

“…Likewise the total irreversibility within the SSHT has been demonstrated to decrease with a decrease in the condensation temperature and to increase with an increase in the evaporator and generator temperatures [24]. A method based upon the rate of change of the irreversibility within each component has subsequently been used to determine the optimum pressure ratio and concentrations within a SSHT using LiBr-H 2 O [29].…”

Low grade waste heat recovery with a novel cascade absorption heat transformer

“…9. with singe stage absorption heat refrigeration, the concentration should be larger than 28 0.06, because, the SSAHT would not be economical otherwise [34]. 29 The composition, temperature, and pressure of generator feed are held constant.…”