Component of vapor-compression REFRIGERATION cycle was modeled at steady state condition. Then, modeling and simulation of the whole cycle was performed to predict system parameters such as compressor work, cooling effect and coefficient of performance (COP) in various ambient conditions. The simulation results were compared with experimental results obtained from an experimental investigation on a split-type air conditioner. It was found that the experimental and simulation results are in good agreement and the model can predict the performance of the cycle successfully. Average difference between experimental and simulation results for prediction of COP was 4.5%. Simulation results show that for each 1oC increase in ambient temperature, COP reduces 3.5%, and for 10% increase in ambient relative humidity, COP increases about 6.5%. Also, by increasing the air volumetric flow rate of condenser about 10%, COP increases about 5%. Effect of increasing the condenser area on its heat rejection rate was studied and it was found that increasing the condenser area, increases the heat rejection rate substantially only in a limited range and after that it does not change.

The exergetic analysis is a tool that has been used successfully in many studies aiming a more rational energy consumption to reduce the cost of processes. With this analysis, it is possible to perform an evaluation of the overall process, locating and quantifying the degradation of exergy. This paper applies exergy approach for analyzing the heat exchanger network design and REFRIGERATION of MTP process. For this purpose, the behavior of some industrial processes and REFRIGERATION cycle with propylene refrigerant has been investigated by exergy method. The equations of exergy destruction and exergetic efficiency for main components such as compressors, heat exchangers and expansion valves were studied. A specified section of propylene recovery unit with its REFRIGERATION cycle has been simulated to perform the exergy analysis. Adding a new valve with optimum pressure drop according to process constraints and an expander results in high performance of multi-stream heat exchanger, saving cold utility consumption, using excess heat of the process section, and low required compression power (in the REFRIGERATION section) which are the most important characteristics of the proposed configuration. Results show that the annual profit reaches 4.3 %.

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.

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.

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.