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Experimental analysis of a new method for overfeeding multiple evaporators in refrigeration systems

机译:一种新的制冷系统中多台蒸发器供气方法的实验分析

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摘要

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. Since there is not a need for superheat at the evaporator exit, each evaporator expansion valve can be controlled by a signal representative, either of the evaporator load, or the evaporator 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 smooth operating conditions, typical of flooded evaporators, while 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.
机译:提出了一种在R744工厂中并行布置的给淹没式蒸发器供料的创新方法。为了促进蒸发器过量供料,喷射器使液体从低压接收器循环回到中间压力接收器。由于不需要在蒸发器出口处过热,因此每个蒸发器膨胀阀都可以通过代表蒸发器负载或蒸发器性能(例如其入口或出口处的空气温度)的信号来控制。与干式膨胀蒸发器系统相比,所提出的解决方案可提供节能和平稳的工作条件,这是满液蒸发器的典型特征,同时仍保持简单的工厂布置。该概念已通过实验验证:蒸发器保持在充满状态下,而喷射器则能够促进液体再循环。与干膨胀操作进行了直接比较。建议的方法主要适用于商业制冷设备,其中许多蒸发器并联布置。

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