Abstract: A refrigeration system particularly suitable for an automobile air conditioning system is disclosed. The system includes an ejector to raise the pressure of the working fluid to the condenser pressure and a boiler which utilizes waste heat from the automobile engine. The boiler produces a near sonic velocity saturated vapor for input to the primary nozzle of the ejector. The near sonic velocity input maximizes the stagnation temperature and pressure of the fluid entering the primary nozzle for a given low or limited temperature heat source such as automobile waste heat. The refrigeration system uses a working fluid having a property such that its entropy when in a saturated vapor state decreases as pressure decreases, which maximizes the input pressure for a given heat source and prevents the vapor from condensing in the ejector. A high efficiency primary nozzle is also provided, allowing the system to take advantage of the decreasing entropy property of the saturated vapor.

Abstract: A refrigeration system particularly suitable for an automobile air conditioning system is disclosed. The system includes an ejector to raise the pressure of the working fluid to the condenser pressure and a boiler which utilizes waste heat from the automobile engine. The boiler produces a near sonic velocity saturated vapor for input to the primary nozzle of the ejector. The near sonic velocity input maximizes the stagnation temperature and pressure of the fluid entering the primary nozzle for a given low or limited temperature heat source such as automobile waste heat. The refrigeration system uses a working fluid having a property such that its entropy when in a saturated vapor state decreases as pressure decreases, which maximizes the input pressure for a given heat source and prevents the vapor from condensing in the ejector. A high efficiency primary nozzle is also provided, allowing the system to take advantage of the decreasing entropy property of the saturated vapor.

Abstract: A refrigeration system particularly suitable for an automobile air conditioning system is disclosed. The refrigeration system uses a hydrocarbon as the working fluid. The system includes an ejector in the refrigeration cycle and a boiler which utilizes waste heat from the automobile engine. A refrigerant storage subsystem may be included in the system to provide an adequate transient response to changes in the waste heat output from the automobile engine and during the engine warm up period.