A hybrid Ejector and CO2 Compression Refrigeration System

混合喷射器和二氧化碳压缩制冷系统

基本信息

批准号：
EP/G011591/1
负责人：
Siddig Omer
金额：
$ 20.12万
依托单位：
University of Nottingham
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2009
资助国家：
英国
起止时间：
2009 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FG011591%2F1
关键词：
hybrid Ejector CO2 Compression Refrigeration

项目摘要

The proposed project aims to investigate a high-performance, low energy refrigeration system for refrigeration in general and for food transport vehicles in particular. The proposed system is based on the integration of a trans-critical CO2 mechanical driven compression cycle and a compact ejector cooling system. The system will be driven by heat rejected from the vehicle exhaust system and heat recovered from the CO2 gas in the mechanical compression cycle. The ejector evaporator replaces the ambient air in the CO2 mechanical compression cycle, by utilizing the cooling effect produced in the ejector cycle to provide sub-cooling of the high-pressure CO2 fluid below ambient temperature. This is thought to help improve the performance of the CO2 cycle. The ejector cycle is integrated in a way to enhance sub-cooling of the high pressure gas, but not to limit the overall system performance to that of the ejector cycle. The system could be operated using two working fluids i.e., CO2 for the mechanical compression cycle and an environmentally friendly working fluid e.g., water or methanol. The proposed system is efficienct, compact and requires minimal energy to operate, features which make the system particulary suitable for applications in transport vehcles. The research programme will involve:1. Thermodynamics and energy transfer analysis of the combined CO2 mechanical compressor -ejector refrigeration system2. Computer modelling for components sizing and performance analysis of the combined refrigeration system.3. Laboratory evaluation of the performance of the system components;4. Analysis of the environmental impact of application of the system.Development of the proposed system would enable refrigeration to be provided for food storage in food transport vehicle with minimum energy consumption owing to utilisation of the waste heat and improvement of the performance of the CO2 mechanical compression cycle. The improved system performance would reduce energy consumption in this sector and also reduce the impact of the global warming attributed to the use of HFC refrigerants.

拟议项目旨在研究一种高性能、低能耗的制冷系统，用于一般制冷，特别是食品运输车辆。所提出的系统基于跨临界二氧化碳机械驱动压缩循环和紧凑喷射冷却系统的集成。该系统将由车辆排气系统排出的热量和机械压缩循环中二氧化碳气体回收的热量驱动。喷射蒸发器在CO2机械压缩循环中取代环境空气，利用喷射循环中产生的冷却效果将高压CO2流体过冷至低于环境温度。这被认为有助于提高二氧化碳循环的性能。喷射器循环的集成方式可增强高压气体的过冷，但不会将整体系统性能限制于喷射器循环的性能。该系统可以使用两种工作流体进行操作，即用于机械压缩循环的二氧化碳和环保工作流体（例如水或甲醇）。所提出的系统高效、紧凑，并且运行所需的能量最少，这些特点使该系统特别适合运输车辆的应用。研究计划将包括： 1． CO2机械压缩机-喷射器组合制冷系统热力学及能量传递分析2．组合制冷系统的部件选型和性能分析的计算机建模。3．系统部件性能的实验室评估；4．分析该系统应用的环境影响。该系统的开发将使食品运输车辆中的食品储存能够以最低的能耗进行制冷，因为利用了废热并提高了二氧化碳机械压缩的性能循环。改进的系统性能将减少该领域的能源消耗，并减少因使用 HFC 制冷剂而导致的全球变暖的影响。