Applications of innovative configurations of double absorption heat transformers in water purification technology

Abstract

A B S T R A C TIn this study, first law of thermodynamics has been employed to analyze the performances of two different configurations of double absorption heat transformers (DAHTs) in water purification system. The upgraded heat in the absorber of the absorption heat transformers provides the heat for desalination process. The first investigated configuration is the most efficient DAHT according to the literature, and the second one is a novel configuration proposed by the authors. The aim of this research was to investigate the effects of different parameters on the studied configurations of DAHTs and the desalination system and to compare their performances in detail. Additionally by considering the quantity of the produced water, both the configurations were optimized. The results revealed that the proposed configuration is capable of producing freshwater for 806 residual units.

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

“…The other configurations follow in the order of DAHT and THAT. The decreasing trend for double and triple configuration is due to the fact that the concentration of the LiBr within the solution decreases at any stage which leads to lower enthalpies at the entrance of the absorber and correspondingly lower amount of heat is released in absorber [63]. Fig.…”

Optimum performance of a double absorption heat transformer

“…The analysis is conducted by varying one parameter at a time while keeping the others at typical values. The temperatures and efficiencies ranges and typical values for the analysis are presented in Table 1 [27,28]. Under the typical working conditions, the system's COP is 0.31; ECOP is 0.56; and the mass flow rates at the state points 3, 4, 11 and 17 are 8.86 ⁄ 10 À3 , 8.52 ⁄ 10 À3 , 38.31 ⁄ 10 À3 and 25.18 ⁄ 10 À3 kg/s, respectively.…”

“…Under the condition of T gen = T evap = 70°C, T abs = 150°C, T con = 30°C and the minimum temperature difference of economizers are 5°C, the COP and ECOP against various absorber-evaporator temperature (T AE ) are calculated by the model of present study and compared with the research done by Zhang and Li [19]. Moreover, the COP versus generator and evaporator temperature (T gen = T evap ) under the condition of T abs = 165°C, T AE = 130°C, T con = 25°C and the economizers efficiencies are 0.8 is compared with the result given by Khamooshi et al [27]. Fig.…”

A waste heat recovery system development and analysis using ORC for the energy efficiency improvement in aluminium electrolysis cells

“…For the purpose of modelling, the first step is to stipulate the size and specifications of the equipment and elements used in the system . As is evident from Table , the available range of thermal power from one cell is between 90 and 250 kW, while the thermal oil temperature varies within the range of 100°C to 220°C.…”