Parametric study and optimization of an ejector-expansion TRCC cycle integrated with a water purification system

Abstract

A combined cogeneration cycle is proposed in which the waste heat from an ejector-expansion trans-critical CO 2 refrigeration cycle is utilized for power production and water purification simultaneously. The waste heat utilization was performed by means of a CO 2 supercritical power cycle and a desalination system for pure water production. In order to run the desalination system, an absorption heat transformer is employed to upgrade the lower temperature waste heat. Thermodynamic models are developed for both the ejector-expansion trans-critical CO 2 cycle and the combined cogeneration cycle consisting of all the above mentioned cycles. A parametric study is conducted to investigate and optimize the performance of each cycle under various operating conditions. It is found that, at the optimum conditions, the energy efficiency ratio of combined cogeneration cycle is about 13-45% higher than the coefficient of performance of the ejector-expansion trans-critical CO 2 cycle. It is also concluded that, as the gas cooler temperature increases, the pure water production rate in the combined cogeneration cycle is increased.

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

“…They demonstrated that the COP and the water production rate had direct relations with the heat source temperature of the AHT. Yari et al [16] proposed and analyzed a combined cogeneration cycle in which the waste heat from an ejector-expansion trans-critical CO 2 refrigeration cycle was utilized for power production and water purification, simultaneously. The waste heat utilization was performed by means of a CO 2 supercritical power cycle and a desalination system for pure water production.…”

Thermo-Economic Analysis of Innovative Integrated Power Cycles for Low-Temperature Heat Sources Based on Heat Transformer

“…Singh et al [9] investigated exergy destruction minimization and component-wise variation in exergy destruction for an Ammonia-Water Absorption Refrigeration System. Yari et al [10] presented a cogeneration cycle to produce power and fresh water retrieving the waste heat of an ejector-expansion trans-critical CO 2 refrigeration cycle. In the proposed system, they utilized an AHT to raise the temperature of waste heat to run a desalination system.…”