The use of solar energy in the refrigeration cycle is one of the newest ways to increase the coefficient of performance and use of clean energy. The purpose of this paper is to present a parametric simulation and the performance analysis of a water-lithium bromide Absorption refrigeration cycle equipped with a solar receiver in terms of thermodynamics and exergy. The effect of different parameters on system efficiency, heat transfer rate in generator, exergy efficiency and exergy changes of the whole system is investigated. The results of the study show that there is an optimal radiation intensity at a given temperature for the evaporator and condenser, in which the total exergy changes of the system are minimized and the system coefficient of performance and its exergy efficiency reach its maximum. The results show that when the evaporator temperature is in the range of 4 to 10 ° C and the condenser temperature is in the range of 33 to 39 ° C, the maximum yield coefficient for the single-cycle cycle is in the range of 0. 75 0 to 80/0. Also, surveys show that the maximum exergy efficiency for a single-cycle refrigeration cycle is in the range of 13 to 23. 7 percent.

This research analyzes an integrated refrigeration system including a microturbine, a compression chiller and an Absorption chiller. The power from the microturbine utilized in the compression chiller compressor, air fans and Absorption chiller pump and the waste heat from the exhaust operates the Absorption chiller. Four various integrated configuration of the compression and Absorption cycles is described and the effect of ambient temperature on the overall efficiency is analyzed. From the results obtained, it is concluded that the use of integrated refrigeration system is more efficient than the system without Absorption chiller.

In this study, the thermoeconomic performance of Absorption refrigeration cycle utilizing binary solution containing water-ionic liquid (1-Ethyl-3-Methylimidazolium Trifluoroacetate) is investigated and compared with the water-lithium bromide cycle. For this purpose, the thermodynamic and thermoeconomic analysis have been employed to simulation of the cycle and then, the effects of design parameters on the performance parameters like coefficient of performance, exergetic efficiency, solution circulation flow ratio, area of heat exchangers and cost of the streams are studied. The thermodynamic properties of the binary solution are predicted using Non-Random Two Liquids model. It has been found the system with ionic liquid has a lower coefficient of performance and exergetic efficiency (0. 66, 10. 15%) than aqueous solution of lithium bromide system (0. 78, 12 %). The total area and total cost of the ionic liquid system (49 m2, 4907 $/year) is larger than water-lithium bromide cycle (16 m2, 3347 $/year). Despite the Lower performance of systems with ionic liquid, the advantages of these liquids like no crystallization, negligible vapor pressure and weak corrosion tendency to iron-steel materials make the new working pair suited for the Absorption refrigeration cycle.

The performance of refrigeration cycle depends not only on their configuration, but also on thermodynamic properties of working pair. Typical Absorption systems use refrigerant/absorbent combinations of lithium bromide-water and water-ammonia. Because of difficulties in using these combinations, researchers proposed Ionic Liquids as novel alternative absorbent of refrigerant which can be used in Absorption refrigeration cycles. In this study, the performance of the Absorption refrigeration system with two different ionic liquids, thermodynamically and economically investigated and compared with the water-lithium bromide system. Multiobjective optimization using genetic algorithm is carried out for optimization of cycle. The thermodynamic properties of mixtures as the working fluid pair are predicted using Non-Random Two Liquids model. The coefficient of performance, exergetic efficiency and product cost flow rate are the parameters which were selected as objective functions. The optimal values of objective functions and design parameters were found and compared to the initial values. Among the combinations include ionic liquids, the highest coefficient of performance and exergetic efficiency and minimum product cost flow rate are obtained for the water-1-ethyl-3-methylimidazolium trifluoroacetate combination.

The exhaust gases of gas turbine power plant carry a significant amount of thermal energy that is usually expelled to the atmosphere; this causes a reduction in net work and efficiency of gas turbine. On the other hand, the generated power and efficiency of gas turbine plants depend largely on the temperature of the inlet air, So that they both increase as the inlet air temperature decreases. The mentioned two problems can be solved by installing an Absorption refrigeration cycle (ARC) at gas turbine inlet, working with thermal energy of exhaust gases. In this research, effect of inlet air cooling on gas turbine performance is studied. The work shows that, the net work and the efficiency will increase by 6-10% and 1-5% respectively for every 10°C decrease of inlet temperature. Since, coefficient of performance (COP) of ARC is low, with high pressure ratios in simple gas turbine (SGT) and with low pressure ratios in regenerative gas turbine (RGT), thermal energy of exhaust gases can not supply all the needed thermal energy for refrigeration cycle. The results show that, when an ejector is included in refrigeration cycle, the need for external energy source required for refrigeration cycle is reduced.

In the present study, exhaust gases from Tehran refinery crude oil furnace are used in a Heat Recovery Steam Generator (HRSG)for generating steam. Then, the steam is directed to a double effect Absorption refrigeration cycle to produce cooling. To meet the object, mass and energy balance equations of the coupling is carried out for both the HRSG and the Absorption chiller and unknown thermodynamic parameters of the system are evaluated. Afterward, by conducting exergy analysis and using the thermoeconomic method, the cost of the product (refrigeration here) is calculated. Finally, optimization is accomplished simultaneously on both HRSG and Absorption chiller in order to minimize the cooling cost by the means of a Genetic algorithm. The outcomes indicate that by using the optimized integrated system 5627 tons of refrigeration is obtainable at the price of 0. 0104 (USD per second). Since the flue gas was wasting to environment pricelessly, it should be noted that by implementing the proposed coupling 1. 186×107cubic meter of natural gas with the price of 1. 508×106(USD) will be saved annually.