초록 ▼

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

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. 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.

대표청구항 ▼

A refrigeration system comprising: a working fluid having a property such that entropy of the working fluid when in a saturated vapor state decreases as pressure decreases; a condenser located along a common fluid flow path for condensing the working fluid to a saturated liquid; a diverter located d

A refrigeration system comprising: a working fluid having a property such that entropy of the working fluid when in a saturated vapor state decreases as pressure decreases; a condenser located along a common fluid flow path for condensing the working fluid to a saturated liquid; a diverter located downstream of the condenser for diverting the working fluid into a primary fluid flow path and a secondary fluid flow path parallel to the primary fluid flow path; an expansion device located along the secondary fluid flow path for decreasing the pressure of the working fluid; an evaporator located along the secondary fluid flow path downstream of the expansion device for evaporating the working fluid; means located along the primary fluid flow path for boiling the working fluid to produce a near sonic velocity saturated vapor; and an ejector located at a junction of the primary and secondary flow paths, the ejector including means, located downstream from the boiling means and sufficiently close to the boiling means to minimize a pressure drop between the boiling means and the ejector, for receiving the working fluid from the boiling means in the near sonic velocity of the working fluid to a supersonic velocity, the ejector further including a section downstream from the receiving and velocity increasing means to mix the working fluid from the boiling means with the working fluid from the evaporator and to increase the pressure of the mixed working fluid to at least the pressure at the condenser.