| Due to the large amount of energy consumed by air-conditioning equipment, new techniques are being sought to use the waste heat as an energy source to power this equipment. One of these techniques is to replace the mechanical compressor by an ejector to compress the refrigerant.;A general description of the system were presented followed by a thermodynamic analysis of the cycle. A computer model of the system was developed. In the model the solutions to basic conservation equations, including the effect of shock wave in the ejector diffuser, was obtained.;The performance analysis of basic systems comprising Carnot jet pump and an ideal turbomachine were determined to demonstrate the total irreversibility involved in the real cycle.;It was shown that COP of an ejector refrigeration system depends on the efficiency of the ejector, and superheating the primary vapor prior to entering the ejector would substantially increase the COP of the system.;This dissertation presents a combined theoretical and experimental analysis of the ejector-compression refrigeration system with particular attention devoted to the benefits and liabilities of superheat.;An actual working model of the system was designed, built, and tested. Favorable comparisons between theory and experiment were observed.;Several ejectors were machined and tested to optimize the primary nozzle size, the diffuser throat diameter, and jet proximity.;In most cases, the COP of the system increased by increasing the boiler pressure, and decreased by increasing the condenser temperature.;It was concluded that the ejector system needs to be operated at or near its critical conditions to achieve the highest performance.;A qualitative comparison between the ejector compression system with other heat-driven systems was performed.;The conclusion to this investigation is that ejector compression refrigeration system is a good substitute for vapor power system in light of its type of motive power which is low grade thermal energy. It is a simple system that requires no maintenance. |
