Single stage and double absorption heat transformers in an industrial application

Abstract

SUMMARYAn industrial application of the single stage and double absorption heat transformer (AHT) systems using water-lithium bromide solutions with water as the refrigerant was analyzed. First, a basic single stage AHT system was described, the operating sequence was explained and thermodynamic system analysis was presented. Next, an application of the single stage AHT system to an industrial company was analyzed. A computer code was prepared to determine the effect of different parameters on the AHT system performance and the results were presented in graphical form. Additionally, the series and parallel double absorption AHT systems were introduced, the operating sequences were explained and thermodynamic system analysis was included. All results were presented in tabular form for comparison. It is concluded that about 50% of the waste heat can be utilized and the hot process water and vapor could be produced by applying single stage and double AHT systems, respectively. The parallel double AHT system could generate more vapor than the series double AHT system.

Comparative assessment of different categories of absorption heat transformers in water desalination process

“…Any enhancement on the temperature of the absorber, results into higher flow ratio and weak solution concentration and consequently lower quantities of COP. This is in consistency with the results stated in Refs [12,13]. As shown in Fig.…”

“…The developed thermodynamic model for SAHT utilizing LiBr + H 2 O has been compared with the reported results of Chen and Liang [61], Ayouet al [62] and Horuz et al [12] and presented in Table. 3. The maximum deviation percentage belongs to Q HEX which is 2.69% which is completely negligible.…”

“…Horuz and Kurt [12] performed a study on performance evaluation of two arrangements of double stage absorption heat transformers. The results demonstrated better performance of parallel configuration over series set up.…”

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

“…A number of studies have demonstrated that the COP of a SSHT increases with an increase in both the generator and evaporator temperatures [12], while decreasing with an increase in the condenser temperature [13,14]. It may also be increased by increasing the solution heat exchanger efficiency [15].…”

Optimum performance of a double absorption heat transformer

“…The result revealed that the maximum exergy destruction happened in the generator, account for about 40% of the total destruction. Horuz and Kurt [20] analyzed single-stage AHT and DAHTs in an industrial application. This application was used to produce hot water and vapor using waste heat sources at about 90°C.…”