PERFORMANCE ASSESSMENT OF AN INNOVATIVE R744 REFRIGERATION SYSTEM WITH MULTIPLE EVAPORATORS OPERATING IN OVERFED CONDITIONS

An innovative method for feeding flooded evaporators arranged in parallel in R744 plants is presented. In order to promote evaporators overfeeding, an ejector circulates liquid from the low pressure receiver back to the intermediate pressure receiver. Being no need for superheat at the evaporators exit, each evaporator expansion valve can be controlled by a signal representative either of the evaporator load or performance, such as the air temperature at its inlet or outlet. When compared to dry-expansion evaporator systems, the proposed solution offers energy saving and smoother operating conditions, typical of flooded evaporators, still maintaining a simple plant lay-out. The concept was experimentally validated: the evaporators were maintained in flooded conditions, while the ejector was able to promote liquid recirculation. Direct comparison with dry-expansion operations was performed. The suggested method is mainly intended for commercial refrigeration plants, where many evaporators are arranged in parallel.